OpusvsSonnet
Halbzuege (47)
1.e4Opus
1. Observe Halbzug 1, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 20. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search9ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Seize a central foothold, develop knights before bishops, and prepare early castling to convert White's first-move tempo into a lasting initiative. Build a classical center and harmonious piece developmen…
- llm.plan21826ms · $0.0403
full reasoning
Phase: opening. Seize a central foothold, develop knights before bishops, and prepare early castling to convert White's first-move tempo into a lasting initiative. Build a classical center and harmonious piece development, castle by move 5-7, then choose a pawn break (against Caro/French/Sicilian) that opens lines toward Black's king. Critical: Black's defense choice (Sicilian asymmetry vs. Caro/French solidity) reshapes my break; avoid premature queen sorties or flank pawn pushes before castling; keep f7/e5 pressure options open without overextending.
6. Candidates Candidates: e4 (Seizes center, opens lines for bishop and queen, fastest path to castling. Direct fight for the initiative per plan.) | d4 (Classical center, fixes a stable pawn, leads to quieter positions with lasting s…
- chess.js.legal_moves0ms
- llm.candidates8510ms · $0.0214
full reasoning
Candidates: e4 (Seizes center, opens lines for bishop and queen, fastest path to castling. Direct fight for the initiative per plan.) | d4 (Classical center, fixes a stable pawn, leads to quieter positions with lasting space; develops toward harmonious setup.) | Nf3 (Develops knight first per plan, controls e5/d4, flexible move-order keeping center options open before committing.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: e4 — Opens diagonals for both bishop and queen, claims the center, and enables the fastest castling. Maximizes the first-move tempo into an open, initiative-driven game per plan.. Rejected: d2d4, g1f3.
- llm.reflect8387ms · $0.0162
9. Commit Commit e4 (e2e4).
2...c5Sonnet
1. Observe Halbzug 2, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 20. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Contest White's central e4 pawn immediately — either with a symmetrical e5 to fight for equal space, or c5 (Sicilian) for asymmetrical tension. Follow up with rapid knight development (Nf6 or Nc6) and pre…
- llm.plan22289ms · $0.0122
full reasoning
Phase: opening. Contest White's central e4 pawn immediately — either with a symmetrical e5 to fight for equal space, or c5 (Sicilian) for asymmetrical tension. Follow up with rapid knight development (Nf6 or Nc6) and prepare kingside castling within 4-5 moves. Achieve dynamic equality by neutralizing White's space advantage through active center contestation and rapid piece coordination, aiming for a position where Black's pieces are at least as active as White's by move 6. Critical: White's e4 controls d5 and f5 — Black must respond to this space claim immediately or concede central dominance; Memory heuristic [OPENING central control]: e5 or d5 must be contested; passive play hands White a free positional advantage; Memory heuristic [OPENING knights before bishops]: Nf6 or Nc6 should follow on move 2 regardless of which pawn response is chosen; No tactical threats yet — this is purely a positional/developmental decision window; King safety not yet a factor but must be addressed by move 5-6 via short castling.
6. Candidates Candidates: e5 (Directly contests White's e4 — symmetrical center fight, classical approach per 'central control' heuristic.) | c5 (Sicilian: asymmetrical tension, fights d4 square without mirroring — dynamic equality pe…
- chess.js.legal_moves0ms
- llm.candidates9391ms · $0.0037
full reasoning
Candidates: e5 (Directly contests White's e4 — symmetrical center fight, classical approach per 'central control' heuristic.) | c5 (Sicilian: asymmetrical tension, fights d4 square without mirroring — dynamic equality per Generation 0 active piece play directive.) | Nf6 (Develops knight immediately per 'knights before bishops' heuristic, attacks e4 and pressures center without committing pawns.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: c5 — Sicilian fights White's d4 square asymmetrically without mirroring — per Generation 0 active piece play directive, the structural imbalance rewards better piece coordination and creates dynamic tension i…
- llm.reflect21252ms · $0.0146
full reasoning
Final pick: c5 — Sicilian fights White's d4 square asymmetrically without mirroring — per Generation 0 active piece play directive, the structural imbalance rewards better piece coordination and creates dynamic tension immediately.. Rejected: e7e5, g8f6.
9. Commit Commit c5 (c7c5).
3.Nf3Opus
1. Observe Halbzug 3, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 30. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search12ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search6ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Develop the kingside knight to fight for e5/d4, keep both Open-Sicilian (d4 break) and Alapin/closed structures available, and ready quick castling to bank the first-move tempo. Steer the Sicilian into a …
- llm.plan19241ms · $0.0712
full reasoning
Phase: opening. Develop the kingside knight to fight for e5/d4, keep both Open-Sicilian (d4 break) and Alapin/closed structures available, and ready quick castling to bank the first-move tempo. Steer the Sicilian into a structure where my central space and faster development outpace Black's asymmetric queenside counterplay, then castle and open lines toward his king before his ...cxd4 counterchances mature. Critical: Black's ...cxd4 break opening the c-file for active counterplay; committing my center prematurely before seeing Black's d6/Nc6/e6 choice; avoiding early queen sorties or flank pushes before castling per the unrochiert-king warning.
6. Candidates Candidates: Nf3 (Develops kingside knight, fights for d4/e5, prepares castling and keeps Open Sicilian d4-break available per the plan.) | c3 (Alapin: builds a d4 center, sidesteps Black's asymmetric queenside counterpla…
- chess.js.legal_moves0ms
- llm.candidates8932ms · $0.0231
full reasoning
Candidates: Nf3 (Develops kingside knight, fights for d4/e5, prepares castling and keeps Open Sicilian d4-break available per the plan.) | c3 (Alapin: builds a d4 center, sidesteps Black's asymmetric queenside counterplay, keeps structure solid before committing.) | Nc3 (Closed Sicilian setup, develops with tempo, avoids early central commitment until Black reveals d6/Nc6/e6 choice.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nf3 — Develops with tempo toward d4/e5, prepares immediate castling, and keeps the Open Sicilian d4-break in reserve so I commit my center only after Black reveals d6/Nc6/e6 — exactly the plan's flexibility..…
- llm.reflect9909ms · $0.0225
full reasoning
Final pick: Nf3 — Develops with tempo toward d4/e5, prepares immediate castling, and keeps the Open Sicilian d4-break in reserve so I commit my center only after Black reveals d6/Nc6/e6 — exactly the plan's flexibility.. Rejected: c2c3, b1c3.
9. Commit Commit Nf3 (g1f3).
4...Nc6Sonnet
1. Observe Halbzug 4, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 22. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search24ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search19ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Deploy Nc6 to immediately pressure e4 and contest d4, then follow with Nf6 to reinforce central influence and prepare kingside castling within 3 moves. The Sicilian asymmetry gives Black queenside counter…
- llm.plan24275ms · $0.0149
full reasoning
Phase: opening. Deploy Nc6 to immediately pressure e4 and contest d4, then follow with Nf6 to reinforce central influence and prepare kingside castling within 3 moves. The Sicilian asymmetry gives Black queenside counterplay in exchange for White's central space. Exploit the Sicilian imbalance: cede some central space to White's e4/d4 duo while building counterplay via the c5 pawn lever, active piece coordination on c6/f6/d6, and eventual queenside pressure — targeting equality by move 6 with superior piece activity compensating White's space. Critical: White's Nf3 eyes d4 — if White plays d4, Black must recapture actively (cxd4 Nxd4) to avoid cramped position; Memory heuristic KNIGHTS BEFORE BISHOPS confirms Nc6 is priority over bishop development — both c6 and f6 must be filled before move 5; Memory heuristic CENTRAL CONTROL: Black's c5 contests d4 but e4/d5 remain White's — Nc6 attacks e4 indirectly and must follow; Black's queen must stay home (memory: QUEEN LATE) — no early Qb6 or Qa5 traps until pieces coordinate; Own weakness: c5 pawn undefended — Nc6 also protects it while developing.
6. Candidates Candidates: Nc6 (KNIGHTS BEFORE BISHOPS: Nc6 develops with tempo, attacks e4, protects c5 pawn — all Sicilian priorities satisfied.) | Nf6 (Nf6 attacks e4 directly, fulfills CENTRAL CONTROL heuristic, prepares kingside c…
- chess.js.legal_moves0ms
- llm.candidates9427ms · $0.0038
full reasoning
Candidates: Nc6 (KNIGHTS BEFORE BISHOPS: Nc6 develops with tempo, attacks e4, protects c5 pawn — all Sicilian priorities satisfied.) | Nf6 (Nf6 attacks e4 directly, fulfills CENTRAL CONTROL heuristic, prepares kingside castling within 3 moves.) | d6 (Solidifies pawn structure, supports e5/f5 breaks, keeps QUEEN LATE — standard Sicilian anchor move.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nc6 — Nc6 satisfies two heuristics simultaneously: KNIGHTS BEFORE BISHOPS (priority development) and CENTRAL CONTROL (attacks e4, defends unguarded c5 pawn). Avoids the 3.e5! tactical refutation that punishes…
- llm.reflect25922ms · $0.0185
full reasoning
Final pick: Nc6 — Nc6 satisfies two heuristics simultaneously: KNIGHTS BEFORE BISHOPS (priority development) and CENTRAL CONTROL (attacks e4, defends unguarded c5 pawn). Avoids the 3.e5! tactical refutation that punishes Nf6 immediately.. Rejected: g8f6, d7d6.
9. Commit Commit Nc6 (b8c6).
5.d4Opus
1. Observe Halbzug 5, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 28. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search9ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Play the d4 break to open the center while ahead in development, recapture with the knight to a strong central post, then develop with tempo and castle short within the next 3-4 moves. Convert White's fir…
- llm.plan14909ms · $0.0501
full reasoning
Phase: opening. Play the d4 break to open the center while ahead in development, recapture with the knight to a strong central post, then develop with tempo and castle short within the next 3-4 moves. Convert White's first-move tempo and central space into an Open-Sicilian initiative, pressuring d5/e5 and the half-open lines toward Black's king before his queenside counterplay on the c-file matures. Critical: Black's ...cxd4 is the thematic equalizer — I must be ready to recapture actively (knight to center) rather than passively, keeping my lead in development; Avoid premature kingside pawn pushes (g4/f4/h4) with my king uncastled — memory-hit 'kingside before castle' warns the opponent counters with development and line-opening; Don't develop the queen early or overextend the center before seeing Black's ...d6/...e6/...g6 setup choice (memory: queen-late, limited-pawn-moves).
6. Candidates Candidates: d4 (Thematic Open Sicilian break, opens center while ahead in development; after cxd4 Nxd4 lands on a strong central post.) | Bb5 (Rossolimo: develops with tempo on Nc6, prepares castling, sidesteps ...cxd4 c…
- chess.js.legal_moves0ms
- llm.candidates10218ms · $0.0363
full reasoning
Candidates: d4 (Thematic Open Sicilian break, opens center while ahead in development; after cxd4 Nxd4 lands on a strong central post.) | Bb5 (Rossolimo: develops with tempo on Nc6, prepares castling, sidesteps ...cxd4 counterplay while pressuring Black's structure.) | Nc3 (Develops toward center, controls d5/e4, keeps flexibility before committing to d4 and short castling.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d4 — The thematic Open Sicilian break while ahead in development. After cxd4 Nxd4 my knight reaches a dominant central post, opening lines toward Black's king before his ...c-file counterplay matures.. Reject…
- llm.reflect9474ms · $0.0220
full reasoning
Final pick: d4 — The thematic Open Sicilian break while ahead in development. After cxd4 Nxd4 my knight reaches a dominant central post, opening lines toward Black's king before his ...c-file counterplay matures.. Rejected: f1b5, b1c3.
9. Commit Commit d4 (d2d4).
6...cxd4Sonnet
1. Observe Halbzug 6, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 27. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search9ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search8ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Capture on d4 immediately to dismantle White's pawn duo and open the c-file. Follow with Nf6 to attack e4 directly, then d6 or e6 to solidify the center and prepare kingside castling within 2 more moves. …
- llm.plan32269ms · $0.0230
full reasoning
Phase: opening. Capture on d4 immediately to dismantle White's pawn duo and open the c-file. Follow with Nf6 to attack e4 directly, then d6 or e6 to solidify the center and prepare kingside castling within 2 more moves. The cxd4 capture is the defining Sicilian tempo — delaying it surrenders the entire opening strategy. Trade the c5 pawn for White's d4 to create the classic Sicilian asymmetry: White gets central space and kingside attacking chances, Black gets the open c-file, active piece play on c6/f6/d5, and queenside counterplay that compensates for the spatial deficit. Critical: White has just played d4 — the previous plan anticipated exactly this; cxd4 MUST happen now or White consolidates a dominant center with d5 or e5 threats; After Nxd4 White's knight is strongly centralized on d4 — Nf6 attacking e4 is the mandatory response to create counterplay and invoke heuristic 'knights before bishops'; Heuristic 'central control' demands removing the d4 pawn rather than yielding White uncontested e4+d4 space; passive play here loses the opening phase entirely.
6. Candidates Candidates: cxd4 (Core Sicilian tempo: dismantles White's pawn duo, opens c-file, creates classic asymmetry. Delaying surrenders central control entirely.) | Nf6 (Knights before bishops heuristic: attacks e4 directly, fo…
- chess.js.legal_moves0ms
- llm.candidates9467ms · $0.0040
full reasoning
Candidates: cxd4 (Core Sicilian tempo: dismantles White's pawn duo, opens c-file, creates classic asymmetry. Delaying surrenders central control entirely.) | Nf6 (Knights before bishops heuristic: attacks e4 directly, forces White to defend, invokes immediate counterplay against White's center.) | Nxd4 (Alternative central trade: knight captures d4, removes White's advanced pawn, though leaves knight exposed to c2-c3 or Qxd4 recapture.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: cxd4 — Mandatory Sicilian tempo: pawn captures d4, forcing Nxd4 recapture, opens c-file, creates classic asymmetry. Central control heuristic demands it NOW — delay lets White consolidate with d5, surrenderin…
- llm.reflect27306ms · $0.0213
full reasoning
Final pick: cxd4 — Mandatory Sicilian tempo: pawn captures d4, forcing Nxd4 recapture, opens c-file, creates classic asymmetry. Central control heuristic demands it NOW — delay lets White consolidate with d5, surrendering the entire opening strategy.. Rejected: g8f6, c6d4.
9. Commit Commit cxd4 (c5d4).
7.Nxd4Opus
1. Observe Halbzug 7, Weiss am Zug. Phase: Eroeffnung. Schwarz +1 Punkte. Legale Zuege: 37. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search6ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Recapture the d4-pawn actively with the knight to a dominant central post, then develop my queenside minor pieces and castle short within 3-4 moves while Black's extra pawn is illusory. Convert White's ce…
- llm.plan14414ms · $0.0399
full reasoning
Phase: opening. Recapture the d4-pawn actively with the knight to a dominant central post, then develop my queenside minor pieces and castle short within 3-4 moves while Black's extra pawn is illusory. Convert White's central space and lead in development in this Open Sicilian into a lasting initiative against Black's king, exploiting the half-open d-file and pressure on d5/e5 before Black organizes ...d6/...Nf6 counterplay. Critical: The d4-pawn is Black's only material and is immediately regained; failing to recapture cleanly squanders the position; Black's natural ...Nf6 will hit e4 — I must support or be ready to meet it with Nc3; Avoid early queen sorties (memory: queen late) and premature flank pawn pushes before castling (memory: kingside before castle).
6. Candidates Candidates: Nxd4 (Cleanly regains the pawn onto a dominant central post; aligns with plan, avoids early queen sortie (memory: queen late).) | Nc3 (Develops and pre-supports e4 against ...Nf6; keeps d4 recapturable next m…
- chess.js.legal_moves0ms
- llm.candidates8879ms · $0.0306
full reasoning
Candidates: Nxd4 (Cleanly regains the pawn onto a dominant central post; aligns with plan, avoids early queen sortie (memory: queen late).) | Nc3 (Develops and pre-supports e4 against ...Nf6; keeps d4 recapturable next move while accelerating development per plan.) | Qxd4 (Regains pawn but exposes queen to ...Nc6 tempo; violates queen-late memory, kept only as backup recapture.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nxd4 — Recaptures cleanly onto the dominant d4 outpost, centralizing the knight where it eyes c6/e6/f5 and keeps it shielded from tempo-gaining harassment. Standard Open Sicilian, perfectly aligned with my de…
- llm.reflect8970ms · $0.0210
full reasoning
Final pick: Nxd4 — Recaptures cleanly onto the dominant d4 outpost, centralizing the knight where it eyes c6/e6/f5 and keeps it shielded from tempo-gaining harassment. Standard Open Sicilian, perfectly aligned with my development plan.. Rejected: b1c3, d1d4.
9. Commit Commit Nxd4 (f3d4).
8...Nf6Sonnet
1. Observe Halbzug 8, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 25. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search9ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Develop Nf6 to immediately pressure e4 and challenge White's central grip. Follow with d6 or e6 to anchor the pawn structure, then develop the dark-squared bishop and castle kingside within 2 more moves. …
- llm.plan34580ms · $0.0238
full reasoning
Phase: opening. Develop Nf6 to immediately pressure e4 and challenge White's central grip. Follow with d6 or e6 to anchor the pawn structure, then develop the dark-squared bishop and castle kingside within 2 more moves. The Nd4 is actively placed but exposed — Nf6 creates a direct counter-threat that forces White to consolidate before attacking. Exploit the classic Sicilian asymmetry: Black's open c-file and active piece play on c6/f6/d5 compensate for White's spatial advantage on e4, enabling queenside counterplay against White's kingside attack. Critical: White Nd4 controls e6/f5/c6/b5 — must not let it stabilize unchallenged; e4 pawn is the anchor of White's space advantage; Nf6 attacks it immediately; Memory heuristic: knights before bishops — Nf6 is the canonical next step, Bg7 or Bb4 can follow; Memory heuristic: central control — Black must contest d5/e5 squares or cede all central space; No immediate tactical threats from White, but Nc3+Be3 setup will come fast if Black delays.
6. Candidates Candidates: Nf6 (Attacks e4 immediately per plan, develops kingside knight, forces White to defend before consolidating Nd4.) | Nxd4 (Eliminates White's active Nd4 before it stabilizes; contests central control per heuri…
- chess.js.legal_moves0ms
- llm.candidates25782ms · $0.0168
full reasoning
Candidates: Nf6 (Attacks e4 immediately per plan, develops kingside knight, forces White to defend before consolidating Nd4.) | Nxd4 (Eliminates White's active Nd4 before it stabilizes; contests central control per heuristic, simplifies favorably.) | e5 (Stakes e5 space, contests d5/e5 squares per central control heuristic, classic Kalashnikov counter-punch.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nf6 — Develops kingside knight per 'knights before bishops' heuristic, attacks e4 immediately forcing White to consolidate rather than freely regroup Nd4, and clears the path for kingside castling — classic S…
- llm.reflect23956ms · $0.0169
full reasoning
Final pick: Nf6 — Develops kingside knight per 'knights before bishops' heuristic, attacks e4 immediately forcing White to consolidate rather than freely regroup Nd4, and clears the path for kingside castling — classic Sicilian development with zero concessions.. Rejected: c6d4, e7e5.
9. Commit Commit Nf6 (g8f6).
9.Nc3Opus
1. Observe Halbzug 9, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 42. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search18ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search8ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Defend the attacked e4-pawn by developing a queenside knight to its natural central square, complete minor-piece development, and castle short within 3 moves while keeping the d4-knight dominant. Leverage…
- llm.plan16262ms · $0.0583
full reasoning
Phase: opening. Defend the attacked e4-pawn by developing a queenside knight to its natural central square, complete minor-piece development, and castle short within 3 moves while keeping the d4-knight dominant. Leverage White's classic Open Sicilian space edge and lead in development — half-open d-file, pressure on d5 — into a kingside initiative before Black consolidates with ...d6/...e6 and the typical ...a6/...b5 queenside expansion. Critical: Black's Nf6 directly attacks e4 — must be met by a developing defense, not a passive pawn move (per 'central control' heuristic); Avoid premature flank pawn moves while uncastled ('ANTI kingside before castle'); Black's strongest reply is ...e5 hitting the d4-knight or ...g6 fianchetto (Dragon) / ...d6 (Scheveningen-Najdorf setups) — I must retain a stable knight outpost and not allow ...e5 to gain tempo with comfort; Own weakness: queenside minors (Bc1, Nb1) and king still undeveloped — develop before committing to any pawn break.6. Candidates Candidates: Nc3 (Develops queenside knight, defends e4 actively, controls d5 outpost — textbook Open Sicilian, fits the 'central control' and develop-before-break plan.) | Nd2 (Also defends e4 but passive, blocks bishop …
- chess.js.legal_moves0ms
- llm.candidates15113ms · $0.0611
full reasoning
Candidates: Nc3 (Develops queenside knight, defends e4 actively, controls d5 outpost — textbook Open Sicilian, fits the 'central control' and develop-before-break plan.) | Nd2 (Also defends e4 but passive, blocks bishop and queen, surrenders the d5 square — inferior to Nc3 yet still a developing defense.) | Bd3 (Defends e4 and develops a bishop, but clogs the d-file behind the strong Nd4 and is less harmonious than Nc3.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nc3 — Nc3 defends e4, develops toward the kingside, and grips the d5 outpost — the textbook Open Sicilian setup keeping the Nd4 stable while completing development before any break.. Rejected: b1d2, f1d3.
- llm.reflect8928ms · $0.0164
9. Commit Commit Nc3 (b1c3).
10...d6Sonnet
1. Observe Halbzug 10, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 27. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search9ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search4ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Play d6 to anchor the center (as flagged in prior plan), then develop Bf8 to e7 and castle kingside within 2 moves. Both knights are already out (memory heuristic 2 — knights before bishops satisfied), so…
- llm.plan52825ms · $0.0436
full reasoning
Phase: opening. Play d6 to anchor the center (as flagged in prior plan), then develop Bf8 to e7 and castle kingside within 2 moves. Both knights are already out (memory heuristic 2 — knights before bishops satisfied), so bishop development is now the priority. Nf6 maintains pressure on e4, honoring heuristic 1 (central control: d6 + Nf6 contest e5/d5). Achieve the Classical Sicilian defensive structure (d6/e7/castled) before launching queenside counterplay with a6–b5 and an eventual d5 break to challenge White's spatial advantage on e4. Critical: Nd4 threatens Nd4xc6 (doubling pawns) or Nd4-b5 (fork d6/c7 after d6) — must time d6 carefully; Bf8 is the key bottleneck blocking kingside castling and rook activation; White's e4 is solid but Nf6 keeps it under tension — do not relieve with ...d5 prematurely.
6. Candidates Candidates: d6 (Primary plan move: anchors center, clears diagonal for Be7, enables kingside castling within 2 moves.) | Nxd4 (Heuristic 1 (Nxd4): eliminates the active d4 knight before it jumps to b5 or f5, neutralizing…
- chess.js.legal_moves0ms
- llm.candidates62990ms · $0.0511
full reasoning
Candidates: d6 (Primary plan move: anchors center, clears diagonal for Be7, enables kingside castling within 2 moves.) | Nxd4 (Heuristic 1 (Nxd4): eliminates the active d4 knight before it jumps to b5 or f5, neutralizing its threat.) | d5 (Heuristic 3 (d5): bold central counter; after exd5 Nxd5 Black gains active piece play fitting generation-0 directive.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d6 — Anchors center, opens Be7 diagonal enabling kingside castling next move, and keeps the d5 break available as a future weapon once Black is castled and coordinated.. Rejected: c6d4, d7d5.
- llm.reflect35912ms · $0.0317
9. Commit Commit d6 (d7d6).
11.Bg5Opus
1. Observe Halbzug 11, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 43. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search7ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search4ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Complete minor-piece development with a harmonious bishop deployment, castle short, and connect rooks — all within 3 moves — while e4 stays comfortably defended by the c3-knight, keeping the d4-knight as …
- llm.plan19907ms · $0.0698
full reasoning
Phase: opening. Complete minor-piece development with a harmonious bishop deployment, castle short, and connect rooks — all within 3 moves — while e4 stays comfortably defended by the c3-knight, keeping the d4-knight as a central anchor. Convert White's Open-Sicilian central space and lead in development into a kingside initiative (f-file or pawn-storm potential) before Black completes the thematic ...a6/...b5 queenside counterplay on the half-open c-file. Critical: Black's main plans are ...g6 (Dragon) or ...a6/...b5 (Najdorf-style) queenside expansion creating counterplay on the open c-file (per 'sicilian' heuristic) — choose a bishop setup flexible against both; Own weakness: an uncastled king while the center is fluid — prioritize castling (per 'castle early') over premature flank action (per 'kingside before castle' anti-pattern); e4 is already defended by Nc3 — no concrete tactical threat against it; avoid wasting tempo re-defending it.
6. Candidates Candidates: Bg5 (Richter-Rauzer: pins f6-knight, pressures both Dragon and Najdorf setups, prepares Qd2+0-0-0 and kingside initiative.) | Be3 (English Attack: reinforces d4-anchor, flexible against ...g6 and ...a6, suppo…
- chess.js.legal_moves0ms
- llm.candidates13902ms · $0.0485
full reasoning
Candidates: Bg5 (Richter-Rauzer: pins f6-knight, pressures both Dragon and Najdorf setups, prepares Qd2+0-0-0 and kingside initiative.) | Be3 (English Attack: reinforces d4-anchor, flexible against ...g6 and ...a6, supports Qd2-0-0-0 with f3/g4 storm.) | Be2 (Classical solid setup, prepares immediate short castling per 'castle early' before Black's ...a6/...b5 counterplay.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bg5 — Richter-Rauzer: the most testing setup against the Classical Sicilian. Pins f6, eyes the Nc6/d7 complex, and prepares Qd2+0-0-0 with a fast kingside pawn-storm before Black organizes ...a6/...b5 on the …
- llm.reflect10443ms · $0.0303
full reasoning
Final pick: Bg5 — Richter-Rauzer: the most testing setup against the Classical Sicilian. Pins f6, eyes the Nc6/d7 complex, and prepares Qd2+0-0-0 with a fast kingside pawn-storm before Black organizes ...a6/...b5 on the c-file.. Rejected: c1e3, f1e2.
9. Commit Commit Bg5 (c1g5).
12...e6Sonnet
1. Observe Halbzug 12, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 33. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search15ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search12ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Develop Bf8 to e7 to break the Bg5 pin on Nf6, then castle kingside immediately. Memory heuristic 1 (central control via Nf6+d6) is already satisfied — heuristic 2 (knights before bishops) is done. Bishop…
- llm.plan32767ms · $0.0251
full reasoning
Phase: opening. Develop Bf8 to e7 to break the Bg5 pin on Nf6, then castle kingside immediately. Memory heuristic 1 (central control via Nf6+d6) is already satisfied — heuristic 2 (knights before bishops) is done. Bishop development is now the sole blocker before king safety is resolved. Reach the Classical Sicilian fortress (d6/e7/0-0) within two moves, then launch queenside counterplay with a6–b5–b4 and an eventual d5 break to contest White's central space advantage from e4. Critical: Bg5 pins Nf6 relative to Qd8 — Be7 neutralizes this immediately; delaying risks Bxf6 doubling pawns or Nd4xc6 fork; Nd4 threatens Nb5 (attacking d6 and c7) or Nxc6 (structural damage) — Be7 + 0-0 resolves king safety before White can exploit these jumps; Black's Bc8 is undeveloped and king is uncastled — every move spent not resolving these two facts is a tempo gift to White.
6. Candidates Candidates: e6 (Clears e7 for Bf8-e7, directly enabling the plan: break Bg5 pin, develop bishop, castle kingside next two moves.) | h6 (Forces Bg5 to declare immediately (Bh4 or Bxf6); heuristic 1 — active piece play, cr…
- chess.js.legal_moves0ms
- llm.candidates88403ms · $0.0751
full reasoning
Candidates: e6 (Clears e7 for Bf8-e7, directly enabling the plan: break Bg5 pin, develop bishop, castle kingside next two moves.) | h6 (Forces Bg5 to declare immediately (Bh4 or Bxf6); heuristic 1 — active piece play, creating threats before resolving structure.) | Nxd4 (Heuristic-suggested exchange removes strong Nd4; simplifies central tension, freeing Black to develop Be7 and castle safely.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: e6 — e6 directly clears e7 for Bf8-e7, neutralizing the Bg5 pin on Nf6 in one tempo. Castle follows immediately: e6→Be7→0-0 fortress in two moves. No structural cost, supports future d5 break.. Rejected: h7h6…
- llm.reflect25791ms · $0.0179
full reasoning
Final pick: e6 — e6 directly clears e7 for Bf8-e7, neutralizing the Bg5 pin on Nf6 in one tempo. Castle follows immediately: e6→Be7→0-0 fortress in two moves. No structural cost, supports future d5 break.. Rejected: h7h6, c6d4.
9. Commit Commit e6 (e7e6).
13.Qd2Opus
1. Observe Halbzug 13, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 48. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search15ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search6ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Complete the Richter-Rauzer setup: develop the queen to d2 connecting it to the g5-bishop's pin on f6, then castle queenside to throw the king-rook into the attack and prepare f4. Keep the d4-knight as th…
- llm.plan18256ms · $0.0691
full reasoning
Phase: opening. Complete the Richter-Rauzer setup: develop the queen to d2 connecting it to the g5-bishop's pin on f6, then castle queenside to throw the king-rook into the attack and prepare f4. Keep the d4-knight as the central anchor and maintain the e4 space advantage while Black still has to untangle. Castle long and launch a central/kingside pawn storm (f4-f5, e-file pressure) exploiting the Bg5-pin and superior development before Black organizes ...a6/...b5/...Qa5 counterplay on the half-open c-file against my king. Critical: Black's thematic ...a6 + ...b5 queenside expansion and ...Qa5 hitting my king once I commit to O-O-O; the Bg5 pin must be supported (Qd2) so an eventual ...Be7 or ...h6 doesn't win the bishop pair on favorable terms; premature pawn pushes near my own uncastled king would open lines against me — castle first, storm second (per anti-pattern: flank attack only after king is safe).
6. Candidates Candidates: Qd2 (Connects queen to the Bg5 pin on f6, prepares O-O-O; the plan's keystone move supporting the bishop before the storm.) | Be2 (Alternative development but passive; Qd2 preferred since it prepares long cas…
- chess.js.legal_moves0ms
- llm.candidates8915ms · $0.0219
full reasoning
Candidates: Qd2 (Connects queen to the Bg5 pin on f6, prepares O-O-O; the plan's keystone move supporting the bishop before the storm.) | Be2 (Alternative development but passive; Qd2 preferred since it prepares long castling. Keeps options, modest.) | f3 (English Attack structure if shifting to O-O-O with g4-h4 storm, but premature before queen connects to pin.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qd2 — The Richter-Rauzer keystone: supports the Bg5 pin on f6 so ...h6/...Be7 can't win the bishop on good terms, and prepares O-O-O before the f4/e-file storm.. Rejected: f1e2, f2f3.
- llm.reflect8326ms · $0.0203
9. Commit Commit Qd2 (d1d2).
14...Be7Sonnet
1. Observe Halbzug 14, Schwarz am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 32. Criticality: 0.30.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search18ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search18ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Break the bishop pin by developing the dark-squared bishop — per heuristic 'knights before bishops', both knights are active so bishop development is now the sole remaining blocker. Immediately castle kin…
- llm.plan49779ms · $0.0403
full reasoning
Phase: opening. Break the bishop pin by developing the dark-squared bishop — per heuristic 'knights before bishops', both knights are active so bishop development is now the sole remaining blocker. Immediately castle kingside after to resolve king safety. Heuristic 'central control' is already satisfied via the d/e pawn chain and the active king's knight on f6. Establish the Classical Sicilian fortress by resolving the pin, securing the king, and launching queenside pawn expansion to undermine White's spatial advantage and prepare a central pawn break that contests the e4 space privilege. Critical: Bishop pin on king's knight against the queen is the critical threat — delay risks doubled pawns via exchange on f6, or the c6-knight exchanged followed by the pin collapsing pawn structure; White's centralized d4-knight threatens an aggressive jump to f5 or b5 once Black castles, punishing any further tempo loss; Once the king is safe, queenside pawn expansion is mandatory — passive play concedes all counterplay and leaves White's space advantage completely unopposed.
6. Candidates Candidates: Be7 (Directly breaks the Bg5 pin on Nf6, develops the dark-squared bishop, and clears f8 for immediate kingside castling per the stated plan.) | Nxd4 (Heuristic-suggested: eliminates White's dominant d4 knigh…
- chess.js.legal_moves0ms
- llm.candidates103402ms · $0.0786
full reasoning
Candidates: Be7 (Directly breaks the Bg5 pin on Nf6, develops the dark-squared bishop, and clears f8 for immediate kingside castling per the stated plan.) | Nxd4 (Heuristic-suggested: eliminates White's dominant d4 knight reducing kingside pressure, after Qxd4 Be7 follows resolving the pin with tempo.) | h6 (Challenges Bg5 forcing Bh4 or Bxf6; either line resolves the f6-knight pin and stabilizes kingside structure before castling.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Be7 — Directly interposes on the Bg5-Nf6-Qd8 pin, develops the f8-bishop, and clears f8 for immediate 0-0. The c6-knight stays on c6, retaining future d5-break potential after castling.. Rejected: c6d4, h7h6.
- llm.reflect49724ms · $0.0393
9. Commit Commit Be7 (f8e7).
15.O-O-OOpus
1. Observe Halbzug 15, Weiss am Zug. Phase: Eroeffnung. Material gleich. Legale Zuege: 47. Criticality: 0.40.
- material-counter0ms
2. Recall Position recall: 12 similar position(s) found (limit=15).
- nex_search14ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search11ms
4. Research research: opening_explorer + web_search both disabled — pure memory-only opening plan.
5. Plan Phase: opening. Castle queenside to connect the rooks and bring the king-rook to the half-open d-file, then prepare f4-f5 to pry open lines against Black's king while the Bg5 pin on f6 still cramps his coordination. Conv…
- llm.plan18307ms · $0.0457
full reasoning
Phase: opening. Castle queenside to connect the rooks and bring the king-rook to the half-open d-file, then prepare f4-f5 to pry open lines against Black's king while the Bg5 pin on f6 still cramps his coordination. Convert my lead in development and central space (e4 + Nd4 anchor) into a kingside/central pawn storm in a Richter-Rauzer race, striking before Black's ...a6/...b5/...Qa5 queenside counterplay reaches my king. Critical: Black's thematic ...a6 + ...b5 + ...Qa5 hitting my king on the half-open c-file (memory: Sicilian = open c-file, active counterplay); I must keep the f6-pin alive so ...d5 or ...Nxe4 freeing breaks stay impossible — memory 'central control' says e4 anchors the whole plan; memory 'castle early / kingside before castle' warns me NOT to push f4 before the king is tucked away, so castling must precede the storm; watch ...Nxd4 trades that ease Black's cramped position and hand him the c-file tempo.
6. Candidates Candidates: O-O-O (Thematic Richter-Rauzer castle: connects rooks, lands Rd1 on the half-open d-file, tucks the king before any f4-f5 storm. Plan's core step.) | Bxf6 (Resolves the pin on my terms, doubling Black's f-paw…
- chess.js.legal_moves0ms
- llm.candidates17232ms · $0.0640
full reasoning
Candidates: O-O-O (Thematic Richter-Rauzer castle: connects rooks, lands Rd1 on the half-open d-file, tucks the king before any f4-f5 storm. Plan's core step.) | Bxf6 (Resolves the pin on my terms, doubling Black's f-pawns or dragging the bishop off, killing ...d5 and ...Nxe4 freeing breaks before castling.) | f4 (Prepares the e4-f4-f5 central/kingside expansion, but premature here per plan: king still on e1, so secondary to castling first.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: O-O-O — Thematic Rauzer castle: connects rooks, plants Rd1 on the half-open d-file pressuring d6, and tucks my king away so f4-f5 can later storm safely. King-safety before the pawn race, per plan.. Rejected:…
- llm.reflect9967ms · $0.0248
full reasoning
Final pick: O-O-O — Thematic Rauzer castle: connects rooks, plants Rd1 on the half-open d-file pressuring d6, and tucks my king away so f4-f5 can later storm safely. King-safety before the pawn race, per plan.. Rejected: g5f6, f2f4.
9. Commit Commit O-O-O (e1c1).
16...O-OSonnet
1. Observe Halbzug 16, Schwarz am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 32. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Resolve the Bg5 pressure on Nf6 — either via h6 (forcing Bh4 or a bishop exchange decision) or by castling immediately and recapturing with the bishop if Bxf6 follows. Per the 'doubled pawn' heuristic,…
- llm.plan91347ms · $0.0730
full reasoning
Phase: middlegame. Resolve the Bg5 pressure on Nf6 — either via h6 (forcing Bh4 or a bishop exchange decision) or by castling immediately and recapturing with the bishop if Bxf6 follows. Per the 'doubled pawn' heuristic, recapturing Bxf6 (not gxf6) preserves pawn structure. King must be castled within the next 1-2 moves before White launches Nd4-f5 or Nd5. Castle kingside to resolve the sole major imbalance (king safety), then convert to a classic Sicilian queenside counterattack with b5-b4, aiming directly at White's queenside-castled king on c1 — per the 'open file rooks' heuristic, the semi-open c- and d-files after ...b5 bxc3 or ...b4 will amplify rook pressure against White's exposed king. Critical: Bg5 threatens Bxf6 doubling f-pawns — recapture order matters: Bxf6 preserves structure, gxf6 creates chronic weakness; Nd4 can jump to f5 attacking Be7 or to b5 attacking a7/d6 if Black delays castling; White has castled queenside — Black's queenside pawn storm (b5-b4) goes directly toward the White king, making counterplay time-sensitive.
6. Candidates Candidates: O-O (Resolves sole major imbalance (king safety); enables queenside b5-b4 storm vs White's exposed king on c1.) | h6 (Forces Bg5 to commit; if Bxf6 recapture is Bxf6 (not gxf6), pawn structure preserved per d…
- chess.js.legal_moves0ms
- llm.candidates41874ms · $0.0334
full reasoning
Candidates: O-O (Resolves sole major imbalance (king safety); enables queenside b5-b4 storm vs White's exposed king on c1.) | h6 (Forces Bg5 to commit; if Bxf6 recapture is Bxf6 (not gxf6), pawn structure preserved per doubled-pawn heuristic.) | Nd5 (Active centralization creates multiple threats; per open-file-rooks heuristic, Nd5 supports ...b5 pawn storm timing.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: O-O — Resolves the sole major imbalance immediately. King safety first: after O-O, Bxf6 is met by Bxf6 (per doubled-pawn heuristic), then b5-b4 storm drives directly at White's exposed king on c1 per open-fil…
- llm.reflect35391ms · $0.0279
full reasoning
Final pick: O-O — Resolves the sole major imbalance immediately. King safety first: after O-O, Bxf6 is met by Bxf6 (per doubled-pawn heuristic), then b5-b4 storm drives directly at White's exposed king on c1 per open-file-rooks heuristic.. Rejected: h7h6, f6d5.
9. Commit Commit O-O (e8g8).
17.Kb1Opus
1. Observe Halbzug 17, Weiss am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 41. Criticality: 0.25.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search10ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Keep the Bg5xf6 pin cramping Black, complete the attacking buildup with f3/g4 or a quick f4-f5 lever, and pile heavy pieces on the half-open d-file while watching the d5 outpost — get three coordinated…
- llm.plan18877ms · $0.0645
full reasoning
Phase: middlegame. Keep the Bg5xf6 pin cramping Black, complete the attacking buildup with f3/g4 or a quick f4-f5 lever, and pile heavy pieces on the half-open d-file while watching the d5 outpost — get three coordinated attackers aimed at the kingside before pushing pawns. Convert my central space (e4 + Nd4) and faster development into a kingside/central pawn storm in this opposite-side-castling race, breaking through against g8 before Black's queenside ...a6/...b5/...Qa5 pawn storm reaches my king on c1. Critical: Black's thematic ...a6 + ...b5 + ...Qa5 counterattack on the half-open c-file against my king — prophylaxis (Kb1) may be needed before I commit pawns (memory: prophylaxis, exchange-heavy-pieces if I fall behind in the race); memory: piece-coordination-attack — I must not throw pawns until 3 pieces are aimed at g8; a lone f5 push without backup just opens lines for nobody; memory: open/half-open-file rooks + weak-squares-outpost — the d-file and a future Nd5 are my structural trumps; if Black ever plays ...e5 hitting Nd4 I gain the d5 outpost; concrete: relieving the f6-pin via ...h6 forcing Bxf6 trades my attacker, and ...Nxd4 simplifications ease Black's defense.
6. Candidates Candidates: Kb1 (Prophylaxis before committing pawns; sidesteps the ...Qa5/...b5 c-file counterattack memory warns about. Free tempo in the race.) | f3 (Prepares the g4-g5 kingside storm while reinforcing e4; builds the …
- chess.js.legal_moves0ms
- llm.candidates15110ms · $0.0516
full reasoning
Candidates: Kb1 (Prophylaxis before committing pawns; sidesteps the ...Qa5/...b5 c-file counterattack memory warns about. Free tempo in the race.) | f3 (Prepares the g4-g5 kingside storm while reinforcing e4; builds the pawn lever without yet opening lines, keeping pieces aimed at g8.) | Nb3 (Avoids ...Nxd4 simplification that eases Black's defense; preserves attackers and eyes c5/a5 squares per piece-coordination memory.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kb1 — In this opposite-castling race Kb1 is the key prophylaxis: it unpins the king from the c-file, removes ...Qa5/...Nxd4-with-check ideas, and gains a free tempo before I commit pawns to the g8 storm.. Rej…
- llm.reflect12408ms · $0.0330
full reasoning
Final pick: Kb1 — In this opposite-castling race Kb1 is the key prophylaxis: it unpins the king from the c-file, removes ...Qa5/...Nxd4-with-check ideas, and gains a free tempo before I commit pawns to the g8 storm.. Rejected: f2f3, d4b3.
9. Commit Commit Kb1 (c1b1).
18...h6Sonnet
1. Observe Halbzug 18, Schwarz am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 29. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search19ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search11ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Challenge Bg5 with h6 (forcing Bh4 or Bxf6 decision), then ignite queenside counterattack with b5-b4. Per the 'doubled pawn' heuristic, if Bxf6 follows, recapture Bxf6 not gxf6 to preserve structure. B…
- llm.plan37925ms · $0.0270
full reasoning
Phase: middlegame. Challenge Bg5 with h6 (forcing Bh4 or Bxf6 decision), then ignite queenside counterattack with b5-b4. Per the 'doubled pawn' heuristic, if Bxf6 follows, recapture Bxf6 not gxf6 to preserve structure. Black's king is already safe; tempo must now shift to pressuring White's exposed Kb1. Convert king-safety advantage into a queenside pawn storm (b5-b4-b3) attacking White's Kb1 while neutralising Nd4's central dominance via piece activity on c5 and e5 squares. Critical: Bg5 pressure on Nf6 — if unresolved, White plays Nd4-f5 or f4-f5 with kingside attack; Nd4 is White's best piece — blocking its outpost via Nc6-e5 or d5-push is priority 2; Own weakness: d6 pawn is backward on semi-open d-file; Rd1 eyes it long-term; Qd2 covers h6 after Bg5 retreats — Qd2-h6 threat if Black is careless with g6; Open file rooks heuristic: after b5-b4 opens the b-file, Rf8 to b8 becomes the thematic plan.
6. Candidates Candidates: h6 (Forces Bg5 to commit (Bxf6 or Bh4), removing pin tension; enables queenside b5-b4 storm per plan's phase-1 priority.) | Ne5 (Occupies strong e5 outpost, blocks Nd4-f5 leap and f4-f5 kingside push; per pla…
- chess.js.legal_moves0ms
- llm.candidates34277ms · $0.0272
full reasoning
Candidates: h6 (Forces Bg5 to commit (Bxf6 or Bh4), removing pin tension; enables queenside b5-b4 storm per plan's phase-1 priority.) | Ne5 (Occupies strong e5 outpost, blocks Nd4-f5 leap and f4-f5 kingside push; per plan priority 2 neutralising Nd4 dominance.) | Nxd4 (Eliminates White's best piece from the d4 outpost; heuristic confirms Nd4 is White's engine—removing it equalises central control.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: h6 — Forces Bg5 to commit immediately. If Bxf6 Bxf6 (bishop recapture preserves structure per doubled-pawn heuristic), Black gets bishop pair. If Bh4, the bishop is misplaced and b5-b4 queenside storm proceed…
- llm.reflect41463ms · $0.0325
full reasoning
Final pick: h6 — Forces Bg5 to commit immediately. If Bxf6 Bxf6 (bishop recapture preserves structure per doubled-pawn heuristic), Black gets bishop pair. If Bh4, the bishop is misplaced and b5-b4 queenside storm proceeds with full tempo against Kb1.. Rejected: c6e5, c6d4.
9. Commit Commit h6 (h7h6).
19.Bh4Opus
1. Observe Halbzug 19, Weiss am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 43. Criticality: 0.25.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search19ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search15ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Maintain the Bg5 pin, prepare g4-g5 or h4-h5 to crack open g8's cover, and triple intent on the half-open d-file so three pieces (Nd4, Bg5, Rd1) aim kingside before throwing pawns — per the 'piece coor…
- llm.plan17218ms · $0.0505
full reasoning
Phase: middlegame. Maintain the Bg5 pin, prepare g4-g5 or h4-h5 to crack open g8's cover, and triple intent on the half-open d-file so three pieces (Nd4, Bg5, Rd1) aim kingside before throwing pawns — per the 'piece coordination attack: 3 attackers first' heuristic. Win the opposite-side-castling race by storming Black's king with a coordinated kingside pawn-and-piece avalanche faster than his ...a6/...b5/...Qa5 wave reaches my king on b1. Critical: Black's ...a6+...b5+...Qa5 queenside pawnstorm against b1 — prophylaxis (Kb1 already done, watch c-file); ...Nxd4 trade easing his cramp and opening lines toward my king; must not lose the d5 outpost or let ...d5 free his game; keep tension before committing pawns.
6. Candidates Candidates: Bh4 (Maintains the f6 pin after ...h6, keeps tension and prepares the thematic g4-g5 storm without conceding the bishop pair.) | Bxf6 (Removes a key kingside defender; ...gxf6 wrecks Black's cover for the paw…
- chess.js.legal_moves0ms
- llm.candidates18247ms · $0.0817
full reasoning
Candidates: Bh4 (Maintains the f6 pin after ...h6, keeps tension and prepares the thematic g4-g5 storm without conceding the bishop pair.) | Bxf6 (Removes a key kingside defender; ...gxf6 wrecks Black's cover for the pawn avalanche, ...Bxf6 lets Nd5 hit the weakened d-file.) | Be3 (Retreats while reinforcing Nd4 and the dark squares, keeps all attackers, and flexibly preserves the g4-g5 plan against the queenside race.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bh4 — Keeps the f6 pin alive after ...h6, preserves the bishop pair, and primes g4-g5: if Black breaks with ...g5 he fatally cracks his own king for my pawn avalanche in the opposite-castling race.. Rejected:…
- llm.reflect14429ms · $0.0447
full reasoning
Final pick: Bh4 — Keeps the f6 pin alive after ...h6, preserves the bishop pair, and primes g4-g5: if Black breaks with ...g5 he fatally cracks his own king for my pawn avalanche in the opposite-castling race.. Rejected: g5f6, g5e3.
9. Commit Commit Bh4 (g5h4).
20...b5Sonnet
1. Observe Halbzug 20, Schwarz am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 31. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search10ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Launch b5 to ignite queenside pawn storm targeting Kb1; reroute Nc6→e5 to contest Nd4's central grip; keep Nf6 defended so Bh4 cannot force gxf6 doubled-pawn structure — per 'doubled pawn' heuristic, o…
- llm.plan56263ms · $0.0416
full reasoning
Phase: middlegame. Launch b5 to ignite queenside pawn storm targeting Kb1; reroute Nc6→e5 to contest Nd4's central grip; keep Nf6 defended so Bh4 cannot force gxf6 doubled-pawn structure — per 'doubled pawn' heuristic, only accept Bxf6 if recapturing with bishop, not g-pawn. Convert Black's king-safety advantage into a concrete queenside offensive: b5-b4 opens the b-file for rooks (per 'open file rooks' heuristic) and directly threatens Kb1's shelter, while Nc6-e5 dislodges Nd4 and neutralises White's only active queenside piece. Critical: Bh4 eyes Nf6 — if Nd4-f5 follows, White gains kingside entry; b5 must come before White consolidates with f4; Nd4 can leap to f5 attacking Be7 and h6 if Black delays; Nc6-e5 or d5 challenge is urgent; Kb1 is structurally exposed — b5-b4-b3 creates passed-pawn threats that force White into defence, equalising initiative.
6. Candidates Candidates: b5 (Queenside pawn storm; opens b-file for rooks (open-file heuristic) and directly pressures exposed Kb1.) | Ne5 (Reroutes Nc6 to contest Nd4's central grip; centralises knight before White plays f4 to conso…
- chess.js.legal_moves0ms
- llm.candidates21801ms · $0.0166
full reasoning
Candidates: b5 (Queenside pawn storm; opens b-file for rooks (open-file heuristic) and directly pressures exposed Kb1.) | Ne5 (Reroutes Nc6 to contest Nd4's central grip; centralises knight before White plays f4 to consolidate.) | Nxd4 (Eliminates White's only active queenside piece Nd4; per heuristic suggestion, removes central pressure immediately.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: b5 — Launches queenside storm targeting Kb1 immediately; per 'open file rooks' heuristic, b5-b4 opens the b-file for Ra8 while each tempo counts before White consolidates with f4 or Nd4-f5.. Rejected: c6e5, c…
- llm.reflect41298ms · $0.0322
full reasoning
Final pick: b5 — Launches queenside storm targeting Kb1 immediately; per 'open file rooks' heuristic, b5-b4 opens the b-file for Ra8 while each tempo counts before White consolidates with f4 or Nd4-f5.. Rejected: c6e5, c6d4.
9. Commit Commit b5 (b7b5).
21.Bd3Opus
1. Observe Halbzug 21, Weiss am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 41. Criticality: 0.25.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search14ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search8ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Get a third attacker pointing at g8 before pushing pawns: keep Bh4's x-ray on the f6/e7/d8 chain, swing for g4-g5 to pry open f6, and load the half-open d-file with Qd2-Rd1 so the kingside breakthrough…
- llm.plan22783ms · $0.0837
full reasoning
Phase: middlegame. Get a third attacker pointing at g8 before pushing pawns: keep Bh4's x-ray on the f6/e7/d8 chain, swing for g4-g5 to pry open f6, and load the half-open d-file with Qd2-Rd1 so the kingside breakthrough lands before Black's b5-b4 hits my Nc3. Win the opposite-castling race by storming Black's king with a coordinated piece-and-pawn avalanche (Bh4 + Nd4 + heavy pieces) faster than the ...b4/...a5/...Qb6 wave cracks my b1 shelter. Critical: Black's ...b4 evicting Nc3 and ...a5-a4 opening lines at my king — prophylaxis on the c-file matters more than a tempo (per the prophylaxis heuristic); ...Nxd4 trade relieving his cramp and trading off my best attacker — recapture must keep an attacker aimed kingside (Qxd4 centralizes, piece-coordination heuristic: 3 attackers first); my Bf1/Rh1 are still passive — the attack stalls until they join, so do not throw g4 prematurely (strongest reply ...b4 hits c3 and gains tempo if my pieces aren't coordinated).
6. Candidates Candidates: Bd3 (Activates the passive Bf1 toward h7, adding a third attacker before pushing pawns — exactly the piece-coordination heuristic the plan demands.) | h3 (Prepares g4-g5 safely without committing prematurely;…
- chess.js.legal_moves0ms
- llm.candidates17293ms · $0.0624
full reasoning
Candidates: Bd3 (Activates the passive Bf1 toward h7, adding a third attacker before pushing pawns — exactly the piece-coordination heuristic the plan demands.) | h3 (Prepares g4-g5 safely without committing prematurely; supports the kingside avalanche while pieces still coordinate, avoiding the premature-g4 trap.) | g4 (Direct storm to pry open f6 via g5, winning the opposite-castling race; aggressive but risks Black's ...b4 counter if pieces lag.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bd3 — Activates my last passive piece toward h7, adding the third attacker the position demands before any pawn storm; keeps tempo while Black's ...b4 is still a move away from hitting c3.. Rejected: h2h3, g2…
- llm.reflect10428ms · $0.0267
full reasoning
Final pick: Bd3 — Activates my last passive piece toward h7, adding the third attacker the position demands before any pawn storm; keeps tempo while Black's ...b4 is still a move away from hitting c3.. Rejected: h2h3, g2g4.
9. Commit Commit Bd3 (f1d3).
22...Ne5Sonnet
1. Observe Halbzug 22, Schwarz am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 32. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search12ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Push b5-b4 to crack open the b-file against Kb1; route Nc6 to e5 to displace Nd4's central grip; keep Nf6 mobile — per 'doubled pawn' heuristic, only concede Bxf6 if recapturing with Be7, never the g-p…
- llm.plan40821ms · $0.0354
full reasoning
Phase: middlegame. Push b5-b4 to crack open the b-file against Kb1; route Nc6 to e5 to displace Nd4's central grip; keep Nf6 mobile — per 'doubled pawn' heuristic, only concede Bxf6 if recapturing with Be7, never the g-pawn Convert queenside pawn momentum (b5-b4-b3) into a direct king attack: once b-file opens per 'open file rooks' heuristic, Ra8 enters play and Kb1's shelter collapses — central play on e5 is the precondition that frees Black to commit queenside without tactical punishment from Nd4 Critical: Bh4 eyes Nf6 — if Nd4-f5 follows White gains kingside counterplay; Nf6 must stay on f6 or retreat to e8 before committing b4; Nd4 is White's anchor piece — without neutralising it via Nc6-e5, b4 advance runs into Nd4-c6 or Nd4-b5 tactical shots; White's Rd1-Rh1 rooks are passive; Black must act before White consolidates with f2-f3 and Nc3-e2-d4 regrouping.
6. Candidates Candidates: Ne5 (Centralizes Nc6, challenges Nd4 anchor; plan's precondition before b4 — prevents Nd4-c6/b5 tactical shots.) | b4 (Cracks b-file vs Kb1; 'open file rooks' heuristic: Ra8 enters play once b-file opens agai…
- chess.js.legal_moves0ms
- llm.candidates32473ms · $0.0280
full reasoning
Candidates: Ne5 (Centralizes Nc6, challenges Nd4 anchor; plan's precondition before b4 — prevents Nd4-c6/b5 tactical shots.) | b4 (Cracks b-file vs Kb1; 'open file rooks' heuristic: Ra8 enters play once b-file opens against exposed king.) | Nxd4 (Removes Nd4 anchor directly; eliminates Nd4-c6/b5 tactical threats, clearing path for safe queenside b4 push.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Ne5 — Centralizes Nc6, challenges Nd4 anchor; plan's precondition before b4 — prevents Nd4-c6/b5 tactical shots.. Rejected: b5b4, c6d4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Ne5 (c6e5).
23.f4Opus
1. Observe Halbzug 23, Weiss am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 43. Criticality: 0.25.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search13ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Win the opposite-castling race: neutralize the centralized Ne5 (it hits Bd3), then prepare g4-g5 to pry open f6 while keeping Bh4's x-ray on the e7/f6 chain and heavy pieces on the half-open d-file. St…
- llm.plan20003ms · $0.0471
full reasoning
Phase: middlegame. Win the opposite-castling race: neutralize the centralized Ne5 (it hits Bd3), then prepare g4-g5 to pry open f6 while keeping Bh4's x-ray on the e7/f6 chain and heavy pieces on the half-open d-file. Storm Black's king with a coordinated Bh4+Nd4+heavy-piece-and-pawn avalanche faster than Black's ...b4/...a5 wave cracks my b1 shelter, converting the kingside breakthrough before my Nc3 is evicted. Critical: Ne5 attacks Bd3 and is a strong centralized piece I must challenge or chase (per outpost/knight heuristic); Black's ...b4 evicting Nc3 then ...a5-a4 opening lines at my king — prophylaxis on the queenside matters more than a tempo; my g4-g5 break must land with 3 attackers coordinated (Bh4, Nd4, Rh1) before pawns advance, else the storm stalls; Bd3 is a key attacker; if forced to trade it for Ne5 I lose attacking material and must reassess.
6. Candidates Candidates: f4 (Chases centralized Ne5 with tempo, resolving the Bd3 attack and gaining kingside space to fuel the g4-g5 storm.) | g4 (Launches the pawn avalanche toward Black's king while Bh4, Nd4, Rh1 already eye the k…
- chess.js.legal_moves0ms
- llm.candidates15725ms · $0.0606
full reasoning
Candidates: f4 (Chases centralized Ne5 with tempo, resolving the Bd3 attack and gaining kingside space to fuel the g4-g5 storm.) | g4 (Launches the pawn avalanche toward Black's king while Bh4, Nd4, Rh1 already eye the kingside; wins the castling race.) | Bxf6 (Removes f6-defender to crack the king cover before g4-g5, though it trades a key dark-square attacker; only if storm needs lines opened.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: f4 — Kicks the centralized Ne5 with tempo and simultaneously resolves the threat on Bd3, gaining f-file/kingside space that fuels the g4-g5 storm before Black's ...b4 wave arrives.. Rejected: g2g4, h4f6.
- llm.reflect16807ms · $0.0495
9. Commit Commit f4 (f2f4).
24...b4Sonnet
1. Observe Halbzug 24, Schwarz am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 33. Criticality: 0.15.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search11ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Push b5-b4 to attack Nc3's base and threaten b3 fork; keep Ne5 anchored to deny Nd4-f5; develop Qd8 toward d7 or b6 to support the queenside advance and connect rooks Open the b-file by pushing b4-b3, …
- llm.plan42880ms · $0.0359
full reasoning
Phase: middlegame. Push b5-b4 to attack Nc3's base and threaten b3 fork; keep Ne5 anchored to deny Nd4-f5; develop Qd8 toward d7 or b6 to support the queenside advance and connect rooks Open the b-file by pushing b4-b3, forcing White to either wreck queenside pawn structure or allow Ra8 to enter play along the b-file directly threatening the exposed Kb1. Critical: Nd4-f5 is White's most dangerous reply — lands on e7 or h6 with tempo, so Ne5 must stay to discourage Nf5 or recapture immediately; Bh4xNf6 trades bishop for knight but per 'doubled pawn' heuristic Black must recapture Bxf6, never gxf6, to preserve king shelter; b4 push invites Nc3-a4 or Nc3-e2 — Black must calculate whether b3 follow-up compensates for temporarily losing queenside knight pressure; Bc8 remains undeveloped — Qd8-b6 plan activates queen and indirectly supports b4-b3 while threatening b2.
6. Candidates Candidates: b4 (Executes the core plan: attacks Nc3's base, forces Na4/Ne2 relocation, opens b-file pressure toward Kb1.) | Qb6 (Activates queen per plan, indirectly supports b4-b3, threatens b2 directly and pressures Nd…
- chess.js.legal_moves0ms
- llm.candidates45717ms · $0.0418
full reasoning
Candidates: b4 (Executes the core plan: attacks Nc3's base, forces Na4/Ne2 relocation, opens b-file pressure toward Kb1.) | Qb6 (Activates queen per plan, indirectly supports b4-b3, threatens b2 directly and pressures Nd4 laterally.) | d5 (Heuristic-suggested central break attacks Nd4 with tempo; if exd5 Nxd5 Black gains strong central knights.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: b4 — Executes the core plan: attacks Nc3's base, forces Na4/Ne2 relocation, opens b-file pressure toward Kb1.. Rejected: d8b6, d6d5. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit b4 (b5b4).
25.fxe5Opus
1. Observe Halbzug 25, Weiss am Zug. Phase: Mittelspiel. Material gleich. Legale Zuege: 43. Criticality: 0.25.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search21ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search16ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Resolve the central tension by capturing on e5 with f4, eliminating Black's powerful centralized outpost knight (which also relieves the attack on Bd3), then redeploy so the f-file and d-file feed a co…
- llm.plan23311ms · $0.0930
full reasoning
Phase: middlegame. Resolve the central tension by capturing on e5 with f4, eliminating Black's powerful centralized outpost knight (which also relieves the attack on Bd3), then redeploy so the f-file and d-file feed a coordinated kingside assault before ...b4xc3 and ...a5-a4 crack my b1 shelter. Win the opposite-castling race by trading off Black's defensive/centralized minor pieces and channeling rooks plus bishop pair against g8 faster than the queenside pawn-storm reaches my king. Critical: Ne5 attacks Bd3 and is a strong outpost (weak-squares/outpost heuristic) — must be challenged or chased now; b4 attacks Nc3; if I dawdle ...bxc3 opens the b-file at my king (prophylaxis heuristic — count Black's counterattack first); capturing on e5 opens the f-file for my Rh1/Rd1 lift (open-file rooks heuristic), but recapture sequences may hit my Nd4 — calculate fxe5 dxe5 Nd4 tension before committing; I still need a third attacker on the kingside (coordination heuristic: 3 pieces before pawns) — Bh4 and heavy pieces must join, not lone thrusts.
6. Candidates Candidates: fxe5 (Core plan: removes Black's e5 outpost knight, relieves Bd3, opens the f-file for my Rh1/Rd1 against g8.) | Nxe6 (Eliminates defender and damages Black's structure; after fxe6 the f-file pressure and bis…
- chess.js.legal_moves0ms
- llm.candidates12149ms · $0.0424
full reasoning
Candidates: fxe5 (Core plan: removes Black's e5 outpost knight, relieves Bd3, opens the f-file for my Rh1/Rd1 against g8.) | Nxe6 (Eliminates defender and damages Black's structure; after fxe6 the f-file pressure and bishop pair target the weakened king.) | Bxf6 (Removes Black's key kingside defender Nf6, recruiting a third attacker theme; trades to win the opposite-castling race.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: fxe5 — Immediately removes Black's dominant e5 knight that forks the f4 pawn and attacks Bd3, opens the f-file for Rh1/Rd1, and after ...dxe5 Nf5 my knight hits the Be7 outpost square in the castling race.. R…
- llm.reflect16766ms · $0.0622
full reasoning
Final pick: fxe5 — Immediately removes Black's dominant e5 knight that forks the f4 pawn and attacks Bd3, opens the f-file for Rh1/Rd1, and after ...dxe5 Nf5 my knight hits the Be7 outpost square in the castling race.. Rejected: d4e6, h4f6.
9. Commit Commit fxe5 (f4e5).
26...b3Sonnet
1. Observe Halbzug 26, Schwarz am Zug. Phase: Mittelspiel. Weiss +3 Punkte. Legale Zuege: 28. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search7ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Push b4-b3 at once to crack open the b-file against Kb1, then route Qd8-b6 to pile pressure on b2. If Nd4-f5 comes, recapture Be7xf5 to stay solid. Follow with Ra8-b8 once the b-file cracks open, explo…
- llm.plan37262ms · $0.0325
full reasoning
Phase: middlegame. Push b4-b3 at once to crack open the b-file against Kb1, then route Qd8-b6 to pile pressure on b2. If Nd4-f5 comes, recapture Be7xf5 to stay solid. Follow with Ra8-b8 once the b-file cracks open, exploiting the memory heuristic that rooks belong on open files targeting the enemy king. Compensate for the material deficit by forcing the b-file open and creating direct mating threats against the exposed White king on b1, making White's material advantage irrelevant if coordination breaks down. Critical: Nd4-f5 jump with tempo hitting Be7 or Nh6 must be pre-empted by keeping Nf6 on f6; Bh4xNf6 trades bishop for knight — per doubled-pawn heuristic must recapture Bxf6 never gxf6; e5-e6 break would shatter Black's center and must be monitored every move; c2-c3 by White closes the queenside counterplay so b3 must come this move.
6. Candidates Candidates: b3 (Must come now before c2-c3 closes counterplay; cracks b-file open targeting Kb1 per plan.) | Qb6 (Routes queen to b6 piling direct pressure on b2; second prong of b-file assault on exposed king.) | Rb8 (R…
- chess.js.legal_moves0ms
- llm.candidates25283ms · $0.0181
full reasoning
Candidates: b3 (Must come now before c2-c3 closes counterplay; cracks b-file open targeting Kb1 per plan.) | Qb6 (Routes queen to b6 piling direct pressure on b2; second prong of b-file assault on exposed king.) | Rb8 (Rooks-on-open-files heuristic: pre-loads b-file before it cracks, ready to exploit Kb1 once b3 plays.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: b3 — b3 must play NOW before c2-c3 seals queenside. Immediately cracks b-file open, forcing axb3 or cxb3, both exposing the Kb1 to Rb8 follow-up. Every other move lets White close with c3.. Rejected: d8b6, a8…
- llm.reflect9435ms · $0.0033
full reasoning
Final pick: b3 — b3 must play NOW before c2-c3 seals queenside. Immediately cracks b-file open, forcing axb3 or cxb3, both exposing the Kb1 to Rb8 follow-up. Every other move lets White close with c3.. Rejected: d8b6, a8b8.
9. Commit Commit b3 (b4b3).
27.axb3Opus
1. Observe Halbzug 27, Weiss am Zug. Phase: Mittelspiel. Weiss +3 Punkte. Legale Zuege: 47. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search11ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Neutralize Black's advanced b3 pawn that sits next to my king before it generates ...bxc2+ shots, recapture/seal the queenside, then convert my clear material edge by keeping the bishop pair active ove…
- llm.plan30754ms · $0.1277
full reasoning
Phase: middlegame. Neutralize Black's advanced b3 pawn that sits next to my king before it generates ...bxc2+ shots, recapture/seal the queenside, then convert my clear material edge by keeping the bishop pair active over open lines. Defuse the opposite-wing pawn intrusion, consolidate the b1 shelter, and trade Black's active pieces while cashing my +3 material with coordinated rooks and bishops into a winning endgame. Critical: Black's b3 pawn threatens ...bxc2+ cracking my king shelter (prophylaxis heuristic: name the threat before my own plan); my exposed b1 king is the real weakness, not Black's; safety outranks attack while I'm up material; tactical resources around e6/e5 and ...Nxe4 forks against Nc3/Qd2 must be checked before committing; bishop-pair plus open d/h-files (open-file rooks heuristic) are my long-term trumps once the king is safe; e5 wedge and central outpost squares (weak-squares heuristic) restrict Black's knight and bishop.
6. Candidates Candidates: axb3 (Removes the b3 pawn and the ...bxc2+ shot while keeping the c2 shelter intact; king safety first per plan.) | exd6 (Opens central lines for bishop pair and rooks, damages Black's structure, while materi…
- chess.js.legal_moves0ms
- llm.candidates16758ms · $0.0638
full reasoning
Candidates: axb3 (Removes the b3 pawn and the ...bxc2+ shot while keeping the c2 shelter intact; king safety first per plan.) | exd6 (Opens central lines for bishop pair and rooks, damages Black's structure, while material edge stays decisive.) | Nxb3 (Captures the intruding pawn directly with the knight, defusing the king-side threat and consolidating the queenside.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: axb3 — Eliminates the ...bxc2+ shot that cracks my b1 shelter while keeping the dominant Nd4 outpost intact and semi-opening the a-file toward a8; king safety first while up material.. Rejected: e5d6, d4b3.
- llm.reflect17767ms · $0.0645
9. Commit Commit axb3 (a2b3).
28...d5Sonnet
1. Observe Halbzug 28, Schwarz am Zug. Phase: Mittelspiel. Weiss +4 Punkte. Legale Zuege: 26. Criticality: 0.00.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search12ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Push d6-d5 to strike at White's e5 space advantage and contest the center. If exd5 exd5, land Rf8 on the newly opened e-file per the open-file rooks heuristic, then reroute Qd8-b6 to pile pressure on b…
- llm.plan107057ms · $0.0856
full reasoning
Phase: middlegame. Push d6-d5 to strike at White's e5 space advantage and contest the center. If exd5 exd5, land Rf8 on the newly opened e-file per the open-file rooks heuristic, then reroute Qd8-b6 to pile pressure on b2 and Kb1. Pre-empt Nd4-f5 by keeping Nf6 anchored on its post. Offset the material deficit (extra White knight) by exploiting the exposed Kb1 via Qb6 and Ra8-b8 coordination, forcing White to defend both the center collapse on d5 and a queenside king attack simultaneously. Critical: Nd4-f5 threat with tempo on Be7 — must be pre-empted or met instantly with Bxf5; Bh4 bears directly on the h4-g5-f6-e7 diagonal: Nf6 must stay to shield Be7; Black cannot afford passive defense at -4 material; d5 break is the only active equaliser.
6. Candidates Candidates: d5 (Primary plan break: strikes e5 space advantage, opens e-file for Rf8 if exd5 exd5.) | Qb6 (Pressures b2 and exposed Kb1 simultaneously; forces White to defend queenside while center collapses.) | dxe5 (Ca…
- chess.js.legal_moves0ms
- llm.candidates28290ms · $0.0235
full reasoning
Candidates: d5 (Primary plan break: strikes e5 space advantage, opens e-file for Rf8 if exd5 exd5.) | Qb6 (Pressures b2 and exposed Kb1 simultaneously; forces White to defend queenside while center collapses.) | dxe5 (Captures White's space-gaining e5 pawn directly; removes the anchor and opens d-file for rook activity.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: d5 — Primary plan break: strikes e5 space advantage, opens e-file for Rf8 if exd5 exd5.. Rejected: d8b6, d6e5. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit d5 (d6d5).
29.Bxf6Opus
1. Observe Halbzug 29, Weiss am Zug. Phase: Mittelspiel. Weiss +4 Punkte. Legale Zuege: 45. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search10ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Resolve the e4/d5 central tension on my terms, keep the strong Nd4 outpost hitting e6/f5, and use the bishop pair plus the half-open d-file to trade Black's active pieces while my extra minor stays unt…
- llm.plan28785ms · $0.1235
full reasoning
Phase: middlegame. Resolve the e4/d5 central tension on my terms, keep the strong Nd4 outpost hitting e6/f5, and use the bishop pair plus the half-open d-file to trade Black's active pieces while my extra minor stays untouched. Convert the clean extra-piece advantage by simplifying into a coordinated rook-and-bishop endgame where the bishop pair dominates the open lines. Critical: Black's ...dxe4 freeing break that opens the centre near my pieces; Bh4-pin on Nf6/Be7 as a lever to trade or win the pinned knight; my Kb1 is actually safe (no black b3 pawn — prior note was wrong), so the real job is liquidation not defence; avoid letting Black activate Bc8 via ...dxe4 and ...e5-tricks.
6. Candidates Candidates: exf6 (Liquidation per plan: removes Black's only active minor, after Bxf6 Bxf6 gxf6 the extra piece converts cleanly with bishop pair intact.) | exd5 (Resolves central tension on my terms; after exd5 the pinn…
- chess.js.legal_moves0ms
- llm.candidates19323ms · $0.0845
full reasoning
Candidates: exf6 (Liquidation per plan: removes Black's only active minor, after Bxf6 Bxf6 gxf6 the extra piece converts cleanly with bishop pair intact.) | exd5 (Resolves central tension on my terms; after exd5 the pinned Nf6 cannot recapture, opening lines toward Black's king while my pieces stay coordinated.) | Bxf6 (Exploits the pin to trade off the pinned knight immediately; after Bxf6 Bxf6 I keep d4 outpost and remain a full piece up.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bxf6 — Up a full piece, so I simplify: Bxf6 trades my bishop for Black's only active minor while keeping the e5 cramp, the Nd4 outpost, and the d3 bishop aimed at g8. Pure liquidation toward a winning endgame…
- llm.reflect30301ms · $0.1239
full reasoning
Final pick: Bxf6 — Up a full piece, so I simplify: Bxf6 trades my bishop for Black's only active minor while keeping the e5 cramp, the Nd4 outpost, and the d3 bishop aimed at g8. Pure liquidation toward a winning endgame.. Rejected: e5f6, e4d5.
9. Commit Commit Bxf6 (h4f6).
30...Bxf6Sonnet
1. Observe Halbzug 30, Schwarz am Zug. Phase: Mittelspiel. Weiss +7 Punkte. Legale Zuege: 25. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search16ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Eliminate Bf6 via Bxf6 to defuse the kingside mating threats, then activate Rf8 on the e-file (open-file rooks heuristic: rooks belong on open lines) if exchanges occur on e6, and reroute Qd8-b6 to att…
- llm.plan92951ms · $0.0768
full reasoning
Phase: middlegame. Eliminate Bf6 via Bxf6 to defuse the kingside mating threats, then activate Rf8 on the e-file (open-file rooks heuristic: rooks belong on open lines) if exchanges occur on e6, and reroute Qd8-b6 to attack Kb1 and b2 simultaneously, creating queenside double threats that complicate White's conversion. Trade off White's dominant Bf6 to reduce direct mating threats against Kg8, then exploit the exposed Kb1 via Qb6-coordination before White can crystallize the large material and space advantage into a clean technical win. Critical: Nd4-f5 fork threat hits Be7 with tempo — must pre-empt or answer instantly with Bxf5 before the knight lands; Bf6 coordinates with Nd4 toward Kg8 via Nxe6 or Nf5 sequences creating concrete mating ideas; Black's d5 pawn (IQP heuristic: needs active piece support or it becomes a permanent blockade target — White's Nd4 already sits on the ideal blockading square d4).
6. Candidates Candidates: Bxf6 (Eliminates dominant Bf6 that coordinates with Nd4 toward Kg8; defuses concrete mating ideas per plan directive.) | Qb6 (Attacks Kb1 and b2 simultaneously; exploits exposed White king on queenside before…
- chess.js.legal_moves0ms
- llm.candidates22840ms · $0.0133
full reasoning
Candidates: Bxf6 (Eliminates dominant Bf6 that coordinates with Nd4 toward Kg8; defuses concrete mating ideas per plan directive.) | Qb6 (Attacks Kb1 and b2 simultaneously; exploits exposed White king on queenside before White crystallizes material advantage.) | dxe4 (Removes IQP (active piece support heuristic), captures material, opens d-file for rook activation on open lines.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Bxf6 — Eliminates dominant Bf6 that coordinates with Nd4 toward Kg8; defuses concrete mating ideas per plan directive.. Rejected: d8b6, d5e4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Bxf6 (e7f6).
31.exf6Opus
1. Observe Halbzug 31, Weiss am Zug. Phase: Mittelspiel. Weiss +4 Punkte. Legale Zuege: 41. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search13ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Resolve the e4/d5 tension on my terms (exd5) to open lines toward Black's e6/d5 weaknesses, keep the dominant Nd4 outpost eyeing e6/f5, and trade Black's active Bf6 or queen while my extra piece stays …
- llm.plan16294ms · $0.0589
full reasoning
Phase: middlegame. Resolve the e4/d5 tension on my terms (exd5) to open lines toward Black's e6/d5 weaknesses, keep the dominant Nd4 outpost eyeing e6/f5, and trade Black's active Bf6 or queen while my extra piece stays safe. Convert the clean extra-minor-piece advantage by simplifying into a coordinated heavy-piece-plus-bishop endgame where the open d-file (per heuristic 1: rooks on open files) and bishop pair dominate. Critical: Black's ...dxe4 break freeing the centre and hitting Nc3/Bd3 (heuristic 7: prophylaxis — answer the threat before pursuing my own plan); Bf6 pressure on Nd4/e5 — guard or trade the outpost (heuristic 10: protect the strong outpost); isolated/backward black e6+d5 pawns become targets once the centre opens (heuristic 2: IQP blockade square); keep Kb1 shelter intact while doubling rooks on the d-file (heuristic 9: trade heavy pieces only to kill counterplay, not initiative).
6. Candidates Candidates: exf6 (Captures Black's active Bf6 outright (heuristic 10), removing the only piece pressuring my Nd4 outpost and locking in the extra material.) | exd5 (Resolves central tension on my terms (plan core), opens…
- chess.js.legal_moves0ms
- llm.candidates22268ms · $0.0987
full reasoning
Candidates: exf6 (Captures Black's active Bf6 outright (heuristic 10), removing the only piece pressuring my Nd4 outpost and locking in the extra material.) | exd5 (Resolves central tension on my terms (plan core), opens the d-file for my rooks and exposes Black's e6 weakness while Nd4 dominates.) | Nf5 (Leaps to a second outpost hitting g7/h6 and dodging Bf6's pressure, keeping initiative before simplifying the winning position.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: exf6 — Wins Black's active Bf6 outright for the e5 pawn (heuristic 10), netting a clean extra piece on top of my existing knight-up edge; after gxf6 Black's king is shattered with no counterplay.. Rejected: e…
- llm.reflect23251ms · $0.1007
full reasoning
Final pick: exf6 — Wins Black's active Bf6 outright for the e5 pawn (heuristic 10), netting a clean extra piece on top of my existing knight-up edge; after gxf6 Black's king is shattered with no counterplay.. Rejected: e4d5, d4f5.
9. Commit Commit exf6 (e5f6).
32...Qxf6Sonnet
1. Observe Halbzug 32, Schwarz am Zug. Phase: Mittelspiel. Weiss +7 Punkte. Legale Zuege: 23. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search17ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Defuse the imminent kingside destruction threat created by the advanced White f-pawn before it captures on the g-file and promotes with check, then reroute the passive queenside bishop into active play…
- llm.plan109413ms · $0.0879
full reasoning
Phase: middlegame. Defuse the imminent kingside destruction threat created by the advanced White f-pawn before it captures on the g-file and promotes with check, then reroute the passive queenside bishop into active play while probing White's exposed king on the queenside via queen activation toward b6. Survive the kingside crisis through urgent structural defense (preventing the f-pawn from capturing the g-pawn and opening a promotion diagonal), then exploit White's exposed king with queen-bishop coordination on the queenside to generate sufficient counterplay and prevent a clean technical conversion of the large advantage. Critical: White's advanced f-pawn threatens to capture the g-pawn immediately, opening a promotion file with check against Kg8 — this is the single most urgent threat and must be addressed before any counterplay plan; Nd4 is a dominant centralized piece threatening to jump to e6 (forking queen and pawn) or f5, gaining decisive tempo; Black's c8-bishop is completely passive (blocked by own pawn structure) — the open-file rooks heuristic reminds us that inactive pieces lose games; the bishop must find an active diagonal urgently; White's king on b1 is somewhat exposed and the d-file rook (open-file rooks heuristic) anchors White's central control — Black's queen approaching b6 simultaneously hits b2 and threatens to activate on the queenside.
6. Candidates Candidates: Qxf6 (Eliminates the lethal f6 pawn immediately; queen centralizes, removing promotion threat and activating on open diagonal.) | gxf6 (Also removes the dangerous f-pawn; keeps queen for queenside counterplay…
- chess.js.legal_moves0ms
- llm.candidates62314ms · $0.0501
full reasoning
Candidates: Qxf6 (Eliminates the lethal f6 pawn immediately; queen centralizes, removing promotion threat and activating on open diagonal.) | gxf6 (Also removes the dangerous f-pawn; keeps queen for queenside counterplay via Qb6 targeting White's exposed b1-king.) | dxe4 (Captures e4 pawn, undermining Nd4 support; open-file rooks heuristic — activates central tension before f-pawn advances.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qxf6 — Eliminates the lethal f6 pawn immediately; queen centralizes, removing promotion threat and activating on open diagonal.. Rejected: g7f6, d5e4. [LLM note: Claude CLI subprocess timed out after 120000ms…
full reasoning
Final pick: Qxf6 — Eliminates the lethal f6 pawn immediately; queen centralizes, removing promotion threat and activating on open diagonal.. Rejected: g7f6, d5e4. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Qxf6 (d8f6).
33.exd5Opus
1. Observe Halbzug 33, Weiss am Zug. Phase: Mittelspiel. Weiss +6 Punkte. Legale Zuege: 41. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search7ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Resolve the e4/d5 tension with exd5 to rip open the centre against Black's weak e6/d5 complex, keep the dominant Nd4 outpost (heuristic: weak squares/outpost) hitting e6/f5, and trade Black's active qu…
- llm.plan15905ms · $0.0529
full reasoning
Phase: middlegame. Resolve the e4/d5 tension with exd5 to rip open the centre against Black's weak e6/d5 complex, keep the dominant Nd4 outpost (heuristic: weak squares/outpost) hitting e6/f5, and trade Black's active queen or Bf6-diagonal piece so my extra minor stays unchallenged. Convert the clean extra-piece advantage by simplifying into a coordinated heavy-piece endgame where doubled rooks own the open d-file (heuristic: open-file rooks) and the bishop dominates Black's exposed pawns. Critical: Black's ...dxe4 break freeing the centre and hitting my Bd3 — must recapture cleanly and not lose the outpost (heuristic: prophylaxis, answer the threat first); Black's queen on f6 and latent Bc8 eyeing my king after lines open; avoid premature king-side loosening; my Kb1 is safe so simplify rather than attack (heuristic: exchange heavy pieces only carries the win when ahead in material).
6. Candidates Candidates: exd5 (Opens the centre against Black's weak e6/d5 complex; after ...exd5 Nxd5 forks Qf6 keeping the Nd4 outpost and extra piece.) | Nxd5 (Wins the d5 pawn and after ...exd5 exd5 the open lines and dominant Nd…
- chess.js.legal_moves0ms
- llm.candidates15396ms · $0.0624
full reasoning
Candidates: exd5 (Opens the centre against Black's weak e6/d5 complex; after ...exd5 Nxd5 forks Qf6 keeping the Nd4 outpost and extra piece.) | Nxd5 (Wins the d5 pawn and after ...exd5 exd5 the open lines and dominant Nd4 leave Black's exposed king and pawns helpless.) | Nxe6 (Grabs a second pawn and shatters Black's structure (fxe6 or Bxe6); piece-up simplification toward a clean win.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: exd5 — Opens the centre while keeping the two-piece edge; after ...exd5 Nxd5 forks Qf6, winning a tempo and leaving the Nd4 outpost and bishop dominating Black's wrecked pawns. Cleanest conversion.. Rejected:…
- llm.reflect15367ms · $0.0626
full reasoning
Final pick: exd5 — Opens the centre while keeping the two-piece edge; after ...exd5 Nxd5 forks Qf6, winning a tempo and leaving the Nd4 outpost and bishop dominating Black's wrecked pawns. Cleanest conversion.. Rejected: c3d5, d4e6.
9. Commit Commit exd5 (e4d5).
34...exd5Sonnet
1. Observe Halbzug 34, Schwarz am Zug. Phase: Mittelspiel. Weiss +7 Punkte. Legale Zuege: 26. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search6ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Activate the dormant Bc8 to b7 or a6 to open diagonal pressure, swing the queen toward b6 to threaten b3 and probe Kb1, and force White to spend tempi defending queenside rather than converting the kni…
- llm.plan46689ms · $0.0335
full reasoning
Phase: middlegame. Activate the dormant Bc8 to b7 or a6 to open diagonal pressure, swing the queen toward b6 to threaten b3 and probe Kb1, and force White to spend tempi defending queenside rather than converting the knight advantage through kingside domination. Maximize counterplay against the exposed White king on b1 by coordinating queen and bishop along the queenside diagonals, trading down selectively to reduce White's two-knight advantage, and preventing Nd4-f5 from establishing total control of the kingside. Critical: Nd4-f5 is the main threat: attacks Qf6 and h6 simultaneously, must be pre-empted or accepted with calculation; Bc8 is a dead piece — every plan that fails to activate it prolongs the material deficit practically; Qd2-h6 could emerge if Black plays passively — h6 pawn is a target needing indirect protection; Own weakness: e6 pawn is backward on a semi-open file and a potential Nd4-f5-e7 fork entry point.
6. Candidates Candidates: exd5 (captures p+centre score=4) | Qxd4 (captures n+centre score=4) | e5 (centre score=1) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: exd5 — captures p+centre score=4. Rejected: f6d4, e6e5. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit exd5 (e6d5).
35.Nxd5Opus
1. Observe Halbzug 35, Weiss am Zug. Phase: Mittelspiel. Weiss +6 Punkte. Legale Zuege: 44. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search15ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search9ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Consolidate the extra piece: keep the dominant Nd4 outpost hitting e6/f5/b5, neutralize Black's only active piece (Qf6) by offering or forcing a queen trade, and contest the d-file with my doubled rook…
- llm.plan18802ms · $0.0706
full reasoning
Phase: middlegame. Consolidate the extra piece: keep the dominant Nd4 outpost hitting e6/f5/b5, neutralize Black's only active piece (Qf6) by offering or forcing a queen trade, and contest the d-file with my doubled rooks against the isolated d5 pawn. Trade heavy pieces and Black's lone active queen to reach a technically winning two-minor-vs-pawns endgame where Nd4 plus Bd3 round up the weak d5/h6 pawns on an open board. Critical: Black's ...d4 break dislodging Nc3 and gaining a passer/activity to compensate for the piece; ...Bf5/...Qg6 trying to trade my strong light-squared Bd3; must avoid letting Qf6 generate kingside or back-rank tricks with my king on b1; do not allow Black's heavy pieces onto open lines for free counterplay.
6. Candidates Candidates: Nxd5 (Wins the isolated d5 pawn AND attacks Qf6, forcing Black's only active piece to move while I'm up two pawns. Nd4 stays defended by Rd1/Qd2.) | Be4 (Adds a second attacker on d5, activates the light bish…
- chess.js.legal_moves0ms
- llm.candidates29791ms · $0.1346
full reasoning
Candidates: Nxd5 (Wins the isolated d5 pawn AND attacks Qf6, forcing Black's only active piece to move while I'm up two pawns. Nd4 stays defended by Rd1/Qd2.) | Be4 (Adds a second attacker on d5, activates the light bishop, keeps full coordination. Consolidation-first per plan against the weak isolani.) | Qe3 (Centralizes the queen, eyes h6 and the e-file, avoids the Qxh6?? gxh6 trap and keeps heavy pieces flexible for the d-file squeeze.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nxd5 — Wins the isolated d5 pawn with tempo, hitting Qf6. If 18...Qxd4 19.Qxd4 (Qd2 guards d4) trades queens and I keep the extra piece plus pawns — exactly the heavy-piece liquidation my plan wants.. Rejecte…
- llm.reflect14576ms · $0.0522
full reasoning
Final pick: Nxd5 — Wins the isolated d5 pawn with tempo, hitting Qf6. If 18...Qxd4 19.Qxd4 (Qd2 guards d4) trades queens and I keep the extra piece plus pawns — exactly the heavy-piece liquidation my plan wants.. Rejected: d3e4, d2e3.
9. Commit Commit Nxd5 (c3d5).
36...Rb8Sonnet
1. Observe Halbzug 36, Schwarz am Zug. Phase: Mittelspiel. Weiss +7 Punkte. Legale Zuege: 33. Criticality: 0.10.
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search8ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search11ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Relocate the queen away from the Nd4-f5 fork threat, activate the dormant Bc8 via a6 or b7 to aim at the queenside and pressure Kb1, and swing Ra8 to a semi-open file — as the open-file rook heuristic …
- llm.plan39461ms · $0.0252
full reasoning
Phase: middlegame. Relocate the queen away from the Nd4-f5 fork threat, activate the dormant Bc8 via a6 or b7 to aim at the queenside and pressure Kb1, and swing Ra8 to a semi-open file — as the open-file rook heuristic demands, both black rooks are currently off all meaningful lines. Force White to defend b3/c2 with the queen-bishop battery while keeping the king safe on g8, accepting a difficult defensive posture and hoping the exposed Kb1 provides enough counterplay to delay White's conversion. Critical: Nd4-f5 is the immediate double-attack threat on Qf6 and h6 — queen must vacate or block; Bc8 is a dead piece losing the game — activation to a6 or b7 is the single most important structural improvement; White's rooks on d1 and h1 are not yet participating — any delay by White gives Black tempo to coordinate queen-bishop battery against Kb1.
6. Candidates Candidates: Qxd4 (captures n+centre score=4) | Qe5 (centre score=1) | Rb8 (development score=0) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rb8 — Only move that avoids immediate queen loss. Both queen moves allow Nd5-f6+, forking Kg8; after the king flees White recaptures the queen. Rb8 concedes h6 to Nd4-f5 fork but keeps the queen alive.. Rejec…
- llm.reflect76837ms · $0.0626
full reasoning
Final pick: Rb8 — Only move that avoids immediate queen loss. Both queen moves allow Nd5-f6+, forking Kg8; after the king flees White recaptures the queen. Rb8 concedes h6 to Nd4-f5 fork but keeps the queen alive.. Rejected: f6d4, f6e5.
9. Commit Commit Rb8 (a8b8).
37.Nxf6+Opus
1. Observe Halbzug 37, Weiss am Zug. Phase: Mittelspiel. Weiss +7 Punkte. Legale Zuege: 51. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search17ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Cement the twin knight outposts on d4/d5, blunt Black's only active piece (Qf6) by inviting or forcing a queen trade, and press the open d-file with my doubled rooks so every simplification trades into…
- llm.plan14897ms · $0.0513
full reasoning
Phase: middlegame. Cement the twin knight outposts on d4/d5, blunt Black's only active piece (Qf6) by inviting or forcing a queen trade, and press the open d-file with my doubled rooks so every simplification trades into a clean piece-up position. Convert the extra piece by trading heavy pieces and Black's lone active queen, steering into a two-minor endgame where the centralized knights and Bd3 mop up the weak d5/h6/a7 pawns on an open board. Critical: Black's ...Qg6 or ...Bf5 trying to swap my strong Bd3 and generate light-square play around my king on b1; any back-rank or ...Qf6-b6/c3 counterplay against my king while heavy pieces remain; avoid loosening moves that surrender the d4/d5 outposts; keep b1-king safe with prophylaxis before forcing the win.
6. Candidates Candidates: Nxf6+ (Wins Black's only active piece: knight takes queen, gxf6 forced. Eliminates all counterplay, leaves me queen-and-piece up. Decisive simplification per plan.) | Ne7+ (Forks king and bishop; after Kh7/Kh…
- chess.js.legal_moves0ms
- llm.candidates19261ms · $0.0802
full reasoning
Candidates: Nxf6+ (Wins Black's only active piece: knight takes queen, gxf6 forced. Eliminates all counterplay, leaves me queen-and-piece up. Decisive simplification per plan.) | Ne7+ (Forks king and bishop; after Kh7/Kh8 Nxc8 grabs the bishop. Strong but Nxf6+ winning the queen is clearly superior.) | Nb6 (Attacks c8 bishop while keeping the d4 outpost; wins more material if bishop cannot defend, but slower than the queen-winning fork.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Nxf6+ — Knight captures Black's only active piece, the queen, with check; gxf6 is forced, leaving me queen-and-piece up. Eliminates all counterplay and converts the win immediately.. Rejected: d5e7, d5b6.
- llm.reflect7876ms · $0.0180
9. Commit Commit Nxf6+ (d5f6).
38...Kh8Sonnet
1. Observe Halbzug 38, Schwarz am Zug. Phase: Mittelspiel. Weiss +16 Punkte. Legale Zuege: 2. Schach! Criticality: 0.55. AUFGABE empfohlen (Material-Floor).
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search9ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Escape the Nf6 check immediately (Kg7 or Kh8 — only 2 legal moves), then try to activate Bc8 toward the a6-f1 diagonal and shift at least one rook to a semi-open file, as the open-file rooks heuristic …
- llm.plan85377ms · $0.0696
full reasoning
Phase: middlegame. Escape the Nf6 check immediately (Kg7 or Kh8 — only 2 legal moves), then try to activate Bc8 toward the a6-f1 diagonal and shift at least one rook to a semi-open file, as the open-file rooks heuristic confirms both Rb8 and Rf8 are currently dormant and contributing nothing. From a deeply losing position, maximize defensive resistance by targeting White's exposed Kb1 via Bc8-a6 or b7 pressure on the b2/b3 pawn complex — the only realistic counterplay source — while accepting that Nd4's next leap to e6 or f5 will further constrict Black's already minimal activity. Critical: Nf6 delivers check RIGHT NOW — king must move before any other plan applies; Nd4 threatens e6/f5 fork the moment king vacates g8, compounding tactical danger; White Qd2+Bd3 battery controls key central and kingside diagonals, limiting king flight squares; Material deficit (+16) means counterplay must come from structure, not piece count — open-file rook activation is the only lever.
6. Candidates Candidates: Kh8 (King escapes check to h8, avoids gxf6 opening f-file for White rooks on dormant Rf8.) | gxf6 (Eliminates attacking Nf6, but opens g-file and f-file — activating White's dormant rooks against Black king.)…
- chess.js.legal_moves0ms
- llm.candidates9444ms · $0.0038
full reasoning
Candidates: Kh8 (King escapes check to h8, avoids gxf6 opening f-file for White rooks on dormant Rf8.) | gxf6 (Eliminates attacking Nf6, but opens g-file and f-file — activating White's dormant rooks against Black king.) | Kh8 (Preserves pawn structure; Kh8 keeps g7 closed, maximizing defensive resistance per open-file rook heuristic.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Kh8 — Preserves g7 pawn structure; keeps g-file and f-file closed against White's dormant Rh1/Rd1. Per open-file rook heuristic, opening those files hands White immediate rook activation on the kingside, acce…
- llm.reflect24306ms · $0.0151
full reasoning
Final pick: Kh8 — Preserves g7 pawn structure; keeps g-file and f-file closed against White's dormant Rh1/Rd1. Per open-file rook heuristic, opening those files hands White immediate rook activation on the kingside, accelerating an already winning attack.. Rejected: g7f6.
9. Commit Commit Kh8 (g8h8).
39.Qf4Opus
1. Observe Halbzug 39, Weiss am Zug. Phase: Mittelspiel. Weiss +16 Punkte. Legale Zuege: 51. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 10 similar position(s) found (limit=15).
- nex_search17ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search8ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Exploit the deep Nf6 outpost beside Black's cornered king: bring the queen toward h6/the back rank and coordinate the d1/h1 rooks for a direct mating attack, simplifying only if no forced mate appears.…
- llm.plan17268ms · $0.0502
full reasoning
Phase: middlegame. Exploit the deep Nf6 outpost beside Black's cornered king: bring the queen toward h6/the back rank and coordinate the d1/h1 rooks for a direct mating attack, simplifying only if no forced mate appears. Convert a winning material plus (+16) by either forcing mate on the h8-king with the Nf6/queen/rook battery or trading into a trivially won piece-up endgame on the open board. Critical: Black's ...Bf5 or ...Qg6 hitting my Bd3 and probing the light squares near Kb1; back-rank checks via the b8/f8 rooks if I overextend; must keep the f6 knight defended and avoid a desperado swap that releases Black's king.
6. Candidates Candidates: Qf4 (Centralizes queen, eyes h6/back rank, keeps Nf6 outpost defended; coordinates battery without committing to an unsound sac.) | Bc4 (Trains bishop on f7, the weak point beside the cornered king, adding a …
- chess.js.legal_moves0ms
- llm.candidates36283ms · $0.1504
full reasoning
Candidates: Qf4 (Centralizes queen, eyes h6/back rank, keeps Nf6 outpost defended; coordinates battery without committing to an unsound sac.) | Bc4 (Trains bishop on f7, the weak point beside the cornered king, adding a second attacker while staying safe from back-rank tricks.) | Rhe1 (Activates the idle rook toward the center/e-file, simplifying conversion of the +16 edge with no risk to king on b1.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qf4 — Centralizes the queen with gain of tempo toward h6, keeps the Nf6 outpost defended, and builds the queen-knight-rook mating battery against the cornered h8-king while staying immune to back-rank tricks.…
- llm.reflect17386ms · $0.0589
full reasoning
Final pick: Qf4 — Centralizes the queen with gain of tempo toward h6, keeps the Nf6 outpost defended, and builds the queen-knight-rook mating battery against the cornered h8-king while staying immune to back-rank tricks.. Rejected: d3c4, h1e1.
9. Commit Commit Qf4 (d2f4).
40...Ba6Sonnet
1. Observe Halbzug 40, Schwarz am Zug. Phase: Mittelspiel. Weiss +16 Punkte. Legale Zuege: 22. Criticality: 0.10. AUFGABE empfohlen (Material-Floor).
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search14ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search4ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Activate the dormant Bc8 — the only undeployed piece — toward the a6-f1 diagonal targeting White's exposed Kb1 and the b2/b3 pawn complex. Simultaneously contest at least one open file with Rb8 or Rf8.…
- llm.plan40431ms · $0.0289
full reasoning
Phase: middlegame. Activate the dormant Bc8 — the only undeployed piece — toward the a6-f1 diagonal targeting White's exposed Kb1 and the b2/b3 pawn complex. Simultaneously contest at least one open file with Rb8 or Rf8. Referencing 'open file rooks' heuristic: both rooks are dormant and generate zero pressure; shifting even one to the d-file or b-file changes the defensive dynamic. From a position already past the material-floor threshold (+16), the sole strategic goal is to generate structural counterplay on the queenside — Bc8-a6 pressure on b2/b3, plus rook activity on open files — to complicate White's technical conversion and exploit any inaccuracy near Kb1, accepting that Nd4 will attempt e6 or f5 to tighten the positional vice. Critical: Nf6 dominates the kingside — controls h7, g8; Black king on h8 has minimal flight squares; Nd4 threatens e6 fork or f5 leap, both devastating; must be accounted for each move; Qf4 can shift to h4 or g4 threatening rapid checkmate along the kingside; Bc8 is completely passive — activating it via Ba6 is the only realistic counterplay source; Both rooks on b8 and f8 are idle — the 'open file rooks' heuristic demands at least one be mobilized to d8 or b-file to pressure White's coordination.
6. Candidates Candidates: Ba6 (Activates dormant Bc8 to a6-f1 diagonal, pressuring Kb1 and b2/b3 pawn complex — the plan's primary counterplay source.) | Rd8 (Open file rooks heuristic: mobilizes idle f8-rook to d-file, contesting ope…
- chess.js.legal_moves0ms
- llm.candidates36817ms · $0.0257
full reasoning
Candidates: Ba6 (Activates dormant Bc8 to a6-f1 diagonal, pressuring Kb1 and b2/b3 pawn complex — the plan's primary counterplay source.) | Rd8 (Open file rooks heuristic: mobilizes idle f8-rook to d-file, contesting open lines and forcing White to coordinate defensively.) | Rxb3 (Captures apparently undefended b3 pawn; creates immediate queenside structural damage and practical complications near Kb1.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Ba6 — Ba6 immediately attacks Bd3 along the a6-d3 diagonal, forcing White to react before executing Nd4-e6 or Nd4-f5. Activates Black's only dormant piece and creates a concrete threat — satisfying both the '…
- llm.reflect92394ms · $0.0688
full reasoning
Final pick: Ba6 — Ba6 immediately attacks Bd3 along the a6-d3 diagonal, forcing White to react before executing Nd4-e6 or Nd4-f5. Activates Black's only dormant piece and creates a concrete threat — satisfying both the 'active piece play' directive and the coordination heuristic.. Rejected: f8d8, b8b3.
9. Commit Commit Ba6 (c8a6).
41.Qf5Opus
1. Observe Halbzug 41, Weiss am Zug. Phase: Endspiel. Weiss +16 Punkte. Legale Zuege: 58. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 15 similar position(s) found (limit=15).
- nex_search8ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: middlegame. Use the entrenched Nf6 (covers g8/h7) plus the queen to storm Black's cornered h8-king; swing the queen to the h-file/g7 zone and add a rook on the open h-file to force mate within a few moves rather t…
- llm.plan18318ms · $0.0574
full reasoning
Phase: middlegame. Use the entrenched Nf6 (covers g8/h7) plus the queen to storm Black's cornered h8-king; swing the queen to the h-file/g7 zone and add a rook on the open h-file to force mate within a few moves rather than cashing material. Convert the +16 by mating the trapped h8-king with the Nf6/queen/heavy-piece battery; only if Black finds a defensive resource do I trade down into a completely won piece-up position. Critical: Black has only back-rank rook shuffles and ...g6/...h5 luft moves — no real counterplay; must keep Nf6 defended (currently by Qf4) so a defensive trade can't break the net; watch my own back rank on b1, but with Nd4/Bd3 covering nothing threatens Kb1 in one move; memory hits are pure rook-endgame theory (Lucena/Philidor/Vancura/square-rule) and do NOT apply to this mating-attack position; the only loosely relevant cards — rook behind passed pawn and king activation — are deferred until after the attack resolves or simplification occurs.
6. Candidates Candidates: Qf5 (Threatens Qh7#: Nf6 already guards h7 and g8, so the queen swinging to h7 along the open f5-h7 diagonal is mate.) | Qxb8 (Wins a full rook; with Black queenless this trivially converts the piece-up posit…
- chess.js.legal_moves0ms
- llm.candidates56259ms · $0.2475
full reasoning
Candidates: Qf5 (Threatens Qh7#: Nf6 already guards h7 and g8, so the queen swinging to h7 along the open f5-h7 diagonal is mate.) | Qxb8 (Wins a full rook; with Black queenless this trivially converts the piece-up position if I prefer simplification over mating.) | Bxa6 (Grabs the bishop, stripping Black's last active piece while keeping Nf6/Qf4 mating net intact for follow-up.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qf5 — Threatens immediate Qh7# since Nf6 guards both h7 (defending the queen) and g8 (the only flight square). Forces mate or massive material gain, far better than just grabbing wood.. Rejected: f4b8, d3a6.
- llm.reflect14411ms · $0.0450
9. Commit Commit Qf5 (f4f5).
42...g6Sonnet
1. Observe Halbzug 42, Schwarz am Zug. Phase: Endspiel. Weiss +16 Punkte. Legale Zuege: 22. Criticality: 0.10. AUFGABE empfohlen (Material-Floor).
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search19ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Challenge the dominant Nf6 with g6, forcing the Qf5 to relocate and momentarily disrupting White's coordination. Simultaneously activate Rf8 toward the e- or d-file to contest central files. Ba6 stays anc…
- llm.plan47302ms · $0.0302
full reasoning
Phase: endgame. Challenge the dominant Nf6 with g6, forcing the Qf5 to relocate and momentarily disrupting White's coordination. Simultaneously activate Rf8 toward the e- or d-file to contest central files. Ba6 stays anchored on b2/b3 diagonal — the only active piece already fulfilling its mission. From a −16 deficit, maximize structural resistance: g6 as a pawn lever dislodges the queen's grip on f5, rooks double on the d- or e-file to create back-rank pressure, and Ba6 ties White's queen-side down — delaying the inevitable but forcing White to calculate, not coast. Critical: Nf6 is a monster outpost — controls g8, h7, d7, e8, restricts Black's king and pieces; removing Qf5 from f5 via g6 is the only structural challenge available; Black king on h8 is permanently exposed to Nf6+Qf5 mating patterns — g6 also guards h7 and buys defensive space; Ba6 is the one well-placed piece (references 'active piece play' directive) — it must not retreat; b2/b3 pressure is the only queenside lever; With 22 legal moves and Material-Floor already exceeded (+16), the sole task is to complicate and resist, not to seek equality.
6. Candidates Candidates: g6 (Primary plan move: dislodges Qf5, challenges Nf6 outpost, guards h7 — active piece play directive.) | Rfe8 (Activates rook to e-file per plan, contests central files and creates back-rank pressure.) | Rxb…
- chess.js.legal_moves0ms
- llm.candidates25773ms · $0.0202
full reasoning
Candidates: g6 (Primary plan move: dislodges Qf5, challenges Nf6 outpost, guards h7 — active piece play directive.) | Rfe8 (Activates rook to e-file per plan, contests central files and creates back-rank pressure.) | Rxb3 (Gains b3 pawn, creates queenside counterplay — maximizes structural resistance from −16 deficit.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: g6 — g6 evicts Qf5 from its dominant post, guards h7 against immediate Qxh7# / Nxh7 patterns, and structurally challenges the Nf6 outpost — the only lever that buys defensive space from the h8 king's exposed …
- llm.reflect43279ms · $0.0322
full reasoning
Final pick: g6 — g6 evicts Qf5 from its dominant post, guards h7 against immediate Qxh7# / Nxh7 patterns, and structurally challenges the Nf6 outpost — the only lever that buys defensive space from the h8 king's exposed position.. Rejected: f8e8, b8b3.
9. Commit Commit g6 (g7g6).
43.Ne6Opus
1. Observe Halbzug 43, Weiss am Zug. Phase: Endspiel. Weiss +16 Punkte. Legale Zuege: 55. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 15 similar position(s) found (limit=15).
- nex_search16ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search5ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Keep the trapped h8-king boxed in: bring the queen to the h7/g7 mating zone where Nf6 already covers g8 and h7, supported by the heavy pieces, and force mate rather than trading down. Convert the +16 by m…
- llm.plan15371ms · $0.0550
full reasoning
Phase: endgame. Keep the trapped h8-king boxed in: bring the queen to the h7/g7 mating zone where Nf6 already covers g8 and h7, supported by the heavy pieces, and force mate rather than trading down. Convert the +16 by mating the cornered h8-king with the Nf6/queen battery, falling back to a winning material liquidation only if Black conjures a defensive resource. Critical: Black has only back-rank rook shuffles and ...g5/...h5 luft — no real counterplay (memory: Zugzwang/no-good-move pattern fits); must keep Nf6 protected so a defensive ...Rxf6 trade can't defuse the attack; watch that the queen does not abandon control of f7/g8 escape squares; ignore the rook-endgame technique cards (Lucena/Philidor) as irrelevant here since we are mating, not converting R+P.
6. Candidates Candidates: Qxg6 (Crashes into the mating zone; Nf6 covers g8/h7 so the queen on g6 sets up Qh7#/Qg7 threats against the cornered king.) | Qh5 (Shifts queen to the h-file targeting h6/h7 while Nf6 keeps g8 and h7 sealed;…
- chess.js.legal_moves0ms
- llm.candidates24280ms · $0.1110
full reasoning
Candidates: Qxg6 (Crashes into the mating zone; Nf6 covers g8/h7 so the queen on g6 sets up Qh7#/Qg7 threats against the cornered king.) | Qh5 (Shifts queen to the h-file targeting h6/h7 while Nf6 keeps g8 and h7 sealed; threatens Qxh6 breaking the king's shelter.) | Ne6 (Brings second knight into the attack, hitting f8-rook and supporting g7; builds the mating net without loosening Nf6's grip.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Ne6 — Brings the d4-knight into the attack with tempo, forking the f8-rook and covering g7, while Nf6 keeps g8/h7 sealed. Adds a third attacker without loosening the mating net or hanging material.. Rejected:…
- llm.reflect40943ms · $0.1785
full reasoning
Final pick: Ne6 — Brings the d4-knight into the attack with tempo, forking the f8-rook and covering g7, while Nf6 keeps g8/h7 sealed. Adds a third attacker without loosening the mating net or hanging material.. Rejected: f5g6, f5h5.
9. Commit Commit Ne6 (d4e6).
44...fxe6Sonnet
1. Observe Halbzug 44, Schwarz am Zug. Phase: Endspiel. Weiss +16 Punkte. Legale Zuege: 22. Criticality: 0.10. AUFGABE empfohlen (Material-Floor).
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search13ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Activate both rooks toward central files (d- or e-file) to create back-rank pressure; preserve Ba6's diagonal pressure on d3 as the sole tactical lever; deny White a clean mating sequence by keeping Black…
- llm.plan71490ms · $0.0524
full reasoning
Phase: endgame. Activate both rooks toward central files (d- or e-file) to create back-rank pressure; preserve Ba6's diagonal pressure on d3 as the sole tactical lever; deny White a clean mating sequence by keeping Black's few remaining pieces on maximally resistant squares From a -16 deficit, maximize structural resistance by exploiting the Ba6-d3 diagonal (a6-b5-c4-d3 fully clear — referenced Philidor rook principle: keep rooks active, not passive on back rank) while forcing White to calculate rather than play automatically Critical: Ne6+Nf6 dual-knight domination controls f8, g8, h7, d8 — mating nets are one queen move away; Ba6 is the only active Black piece — diagonal to d3 must not be relinquished; Kh8 opposition is fixed (memory heuristic: king activity matters — Black king is fully passive, worsening all defensive tasks).
6. Candidates Candidates: fxe6 (Captures dominant Ne6, dismantling dual-knight mating net; maximally resistant as it removes the piece controlling f8/h7/d8.) | Bxd3 (Executes plan's sole tactical lever: Ba6-d3 diagonal fully clear; fo…
- chess.js.legal_moves0ms
- llm.candidates56610ms · $0.0441
full reasoning
Candidates: fxe6 (Captures dominant Ne6, dismantling dual-knight mating net; maximally resistant as it removes the piece controlling f8/h7/d8.) | Bxd3 (Executes plan's sole tactical lever: Ba6-d3 diagonal fully clear; forces White recapture, removing active Bd3 from defense.) | Rxb3 (Activates rook to 3rd rank (Philidor principle), wins pawn, and threatens Rxd3 follow-up if bishop vacates.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: fxe6 — Captures dominant Ne6, dismantling dual-knight mating net; maximally resistant as it removes the piece controlling f8/h7/d8.. Rejected: a6d3, b8b3. [LLM note: Claude CLI subprocess timed out after 1200…
full reasoning
Final pick: fxe6 — Captures dominant Ne6, dismantling dual-knight mating net; maximally resistant as it removes the piece controlling f8/h7/d8.. Rejected: a6d3, b8b3. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit fxe6 (f7e6).
45.Qxg6Opus
1. Observe Halbzug 45, Weiss am Zug. Phase: Endspiel. Weiss +13 Punkte. Legale Zuege: 48. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 15 similar position(s) found (limit=15).
- nex_search10ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Deliver mate against the cornered h8-king by routing the queen into the g6/h7/g7 zone where the f6-knight already guards the h7 and g8 escape squares, so a queen check there is supported and lethal. Force…
- llm.plan20294ms · $0.0724
full reasoning
Phase: endgame. Deliver mate against the cornered h8-king by routing the queen into the g6/h7/g7 zone where the f6-knight already guards the h7 and g8 escape squares, so a queen check there is supported and lethal. Force checkmate on the boxed-in h8-king using the Nf6/queen battery (queen infiltrates the kingside light squares while the knight covers flight squares), not liquidate the +13 unless Black finds a real defensive resource. Critical: Nf6 must stay protected or available so a defensive rook-for-knight trade cannot defuse the h7/g8 coverage; Black has only back-rank rook shuffles and ...g5/...h5 luft — no genuine counterplay (Zugzwang/no-good-move pattern fits); watch that capturing the g6-pawn or invading does not walk the queen into a rook fork or self-block the mating diagonal; keep king on b1 safe — Black's a6-bishop and rooks have no attacking traction.
6. Candidates Candidates: Qxg6 (Infiltrates the light squares; threatens Qh7# since Nf6 guards h7 and g8. h6-pawn cannot recapture. Crushing.) | Qh5 (Eyes h6 and h7; threatens Qxh6+ and renewed mating ideas while Nf6 keeps g8/h7 cover…
- chess.js.legal_moves0ms
- llm.candidates25774ms · $0.1026
full reasoning
Candidates: Qxg6 (Infiltrates the light squares; threatens Qh7# since Nf6 guards h7 and g8. h6-pawn cannot recapture. Crushing.) | Qh5 (Eyes h6 and h7; threatens Qxh6+ and renewed mating ideas while Nf6 keeps g8/h7 covered. King stays boxed.) | Qxe6 (Safe pawn grab keeping the f6-knight battery; maintains +14 without walking into any rook fork or self-block.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qxg6 — Queen lands on g6 (unrecapturable: h6-pawn captures diagonally to g5, king can't reach it) threatening Qh7# and Qg7#, both covered by the Nf6 battery guarding h7/g8/g7. No defense.. Rejected: f5h5, f5e…
- llm.reflect14466ms · $0.0470
full reasoning
Final pick: Qxg6 — Queen lands on g6 (unrecapturable: h6-pawn captures diagonally to g5, king can't reach it) threatening Qh7# and Qg7#, both covered by the Nf6 battery guarding h7/g8/g7. No defense.. Rejected: f5h5, f5e6.
9. Commit Commit Qxg6 (f5g6).
46...Rxb3Sonnet
1. Observe Halbzug 46, Schwarz am Zug. Phase: Endspiel. Weiss +14 Punkte. Legale Zuege: 22. Criticality: 0.10. AUFGABE empfohlen (Material-Floor).
- material-counter0ms
2. Recall Position recall: 5 similar position(s) found (limit=5).
- nex_search19ms
3. Recall Opponent No pattern found for chess-opus-tm (tag=chess-opus-tm) — mandatory run documented.
- nex_entity_search7ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Counter the imminent back-rank mating threat by forcing the dominating White queen off its central post via a h-pawn counterattack, or by blocking the mating square with a rook; if the queen is displaced,…
- llm.plan89053ms · $0.0651
full reasoning
Phase: endgame. Counter the imminent back-rank mating threat by forcing the dominating White queen off its central post via a h-pawn counterattack, or by blocking the mating square with a rook; if the queen is displaced, exploit the bishop's long diagonal as the sole remaining tactical lever within three moves. From a -14 deficit with resignation recommended, apply the Philidor active-rook principle — both rooks must stay maximally active on semi-open central files rather than passive on the back rank, converting Black's minimal structural resistance (bishop's diagonal, e-pawn) into forced calculation burdens for White rather than a trivial mating finish. Critical: White queen and knight form an immediate mating net against the Black king — no flight squares available without first neutralizing the knight's dominance over g8 and h7; Bishop on a6 keeps the long diagonal fully clear to d3 per prior plan, but cannot single-handedly prevent the mating threats — rook activity is essential per Philidor; h-pawn advance is Black's only active counterattack candidate: forces queen relocation and buys calculation tempo, though White retains overwhelming material superiority regardless.
6. Candidates Candidates: Rxb3 (captures p score=3) | Rxf6 (captures n score=3) | Bxd3 (captures b score=3) [Fallback: Claude CLI subprocess timed out after 120000ms]
- chess.js.legal_moves0ms
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Rxb3 — captures p score=3. Rejected: f8f6, a6d3. [LLM note: Claude CLI subprocess timed out after 120000ms]
9. Commit Commit Rxb3 (b8b3).
47.Qh7#Opus
1. Observe Halbzug 47, Weiss am Zug. Phase: Endspiel. Weiss +13 Punkte. Legale Zuege: 45. Criticality: 0.20.
- material-counter0ms
2. Recall Position recall: 15 similar position(s) found (limit=15).
- nex_search14ms
3. Recall Opponent No pattern found for chess-sonnet-tmd (tag=chess-sonnet-tmd) — mandatory run documented.
- nex_entity_search6ms
4. Research middlegame/endgame — research not relevant when both tools off.
5. Plan Phase: endgame. Convert the +13 immediately by delivering mate to the boxed h8-king using the queen-plus-Nf6 battery, where the knight already seals g8 and h7 while the queen owns the g7/h7 light squares; refuse any liqu…
- llm.plan26295ms · $0.0963
full reasoning
Phase: endgame. Convert the +13 immediately by delivering mate to the boxed h8-king using the queen-plus-Nf6 battery, where the knight already seals g8 and h7 while the queen owns the g7/h7 light squares; refuse any liquidation when forced mate exists. Finish the game now with a knight-supported queen mate on the kingside light squares rather than trading into a won-but-slower rook endgame. Critical: the h8-king has no flight squares since Nf6 covers g8/h7 and the queen covers g7; Black's only tries are b3/f8 rook checks or interpositions that do not defend the mating square; keep Nf6 protected/intact so a rook-for-knight desperado cannot reopen the king's escape squares.
6. Candidates Candidates: Qh7# (Checkmate. Nf6 covers g8, queen on h7 attacks king with no flight squares. Forced mate fulfills the plan.) | Qxh6# (Checkmate. Queen takes h6 pawn, Nf6 seals g8/h7/f7, king on h8 has no escape. Equally …
- chess.js.legal_moves0ms
- llm.candidates8890ms · $0.0261
full reasoning
Candidates: Qh7# (Checkmate. Nf6 covers g8, queen on h7 attacks king with no flight squares. Forced mate fulfills the plan.) | Qxh6# (Checkmate. Queen takes h6 pawn, Nf6 seals g8/h7/f7, king on h8 has no escape. Equally decisive.) | Qg7+ (Backup check forcing Rxg7 then knight recapture, but inferior since immediate mate exists. Only a fallback.)
7. Verify Alle 3 Kandidaten legal. cloud_eval disabled (default).
- chess.js.legal_recheck0ms
8. Reflect Final pick: Qh7# — Immediate mate. Nf6 seals g8 and the queen lands on h7 giving check; the h8-king has zero flight squares (h7 occupied, g8/g7 covered) and Black cannot block an adjacent-square check. Game over.. Reject…
- llm.reflect8881ms · $0.0187
full reasoning
Final pick: Qh7# — Immediate mate. Nf6 seals g8 and the queen lands on h7 giving check; the h8-king has zero flight squares (h7 occupied, g8/g7 covered) and Black cannot block an adjacent-square check. Game over.. Rejected: g6h6, g6g7.
9. Commit Commit Qh7# (g6h7).
PGN
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[Event "Tournament Pairing 8"] [Site "?"] [Date "2026-05-31"] [Round "?"] [White "chess-opus-tm"] [Black "chess-sonnet-tmd"] [Result "*"] 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. Kb1 h6 10. Bh4 b5 11. Bd3 Ne5 12. f4 b4 13. fxe5 b3 14. axb3 d5 15. Bxf6 Bxf6 16. exf6 Qxf6 17. exd5 exd5 18. Nxd5 Rb8 19. Nxf6+ Kh8 20. Qf4 Ba6 21. Qf5 g6 22. Ne6 fxe6 23. Qxg6 Rxb3 24. Qh7# *