Reasoning eval · Puzzle MrF6v

1 of 3 models found the move, and said 8 false things along the way

Green is the solution, red is what the model played when it differed. Each claim below was pulled out of the prose beside it and checked against this exact position.

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SolutionPlayedBlack to move
Rating
1544(1600 band)
Solution
d8b6 b3b6 a7b6
Motifs
advantagemiddlegameshort
FEN
2rq1rk1/p4pp1/1N3b1p/8/8/PQ6/1P3PPP/3R1RK1 b - - 0 20
MissedPlayed d8d5(−1655cp)Claims true 83%3949 out · $0.0402 · 49.5s

Stated plan

Play Qd5 to attack the undefended white queen on b3, exploiting the a2-d5 diagonal while tactically covering the rook on c8.

Resolves to d8d5 · −1655cp

Reasoning

Black's rook on c8 is attacked by the knight on b6, but instead of passively retreating, Black can strike back with Qd5, hitting the undefended queen on b3 along the a2–d5 diagonal. If White grabs the rook with Nxc8, Black plays Qxb3, winning the queen and coming out significantly ahead in material (queen+rook+bishop vs two rooks+knight). If White tries to save the queen with Qc3, the bishop on f6 forks it with Bxc3. Other queen retreats (like Qb4) allow Black to safely reroute the rook (e.g., Rb8) while keeping a strong, active position. Thus Qd5 is a powerful double-purpose move that creates a decisive threat while covering the hanging rook tactically.

Claims extracted from it

5 true · 1 false · 2 unverifiable

Hover a claim to light up the squares it is about.

  • True

    Black's rook on c8 is attacked by the knight on b6

    attackedsquare=c8by=white

  • True

    the queen on b3 is undefended

    defendedsquare=b3negated=true

  • Unverifiable

    Qd5 hits the queen on b3 along the a2–d5 diagonal

    lineprefix=playedmoves=Qd5assertion=type:attacks_piece piece:queen

  • True

    If Nxc8, then Qxb3 wins the queen

    lineprefix=playedmoves=Qd5 Nxc8 Qxb3assertion=type:captures_piece piece:queen

  • True

    After Nxc8 Qxb3, Black comes out significantly ahead in material (queen+rook+bishop vs two rooks+knight)

    lineprefix=playedmoves=Qd5 Nxc8 Qxb3assertion=type:material_delta side:black min_value:1

  • True

    If Qc3, the bishop on f6 forks it with Bxc3

    lineprefix=playedmoves=Qd5 Qc3 Bxc3assertion=type:captures_piece piece:queen

  • Unverifiable

    After Qb4, Black can safely reroute the rook (e.g., Rb8) while keeping a strong, active position

    lineprefix=playedmoves=Qd5 Qb4 Rb8assertion=type:unverifiable

  • False

    Qd5 is a powerful double-purpose move that creates a decisive threat while covering the hanging rook tactically

    best_movemove=Qd5