Reasoning eval · Puzzle ngAcO

2 of 3 models found the move, and said 6 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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SolutionPlayed (same)Black to move
Rating
1648(1600 band)
Solution
b4a2 c1b1 a2c3
Motifs
crushingmastermiddlegamequeensideAttackshort
FEN
r4r1k/p1p1q1pp/5n2/1Q2pP2/1n4P1/5N2/PPPN1P1P/2KR3R b - - 0 16
SolvedPlayed b4a2(−1cp)Claims true 67%3915 out · $0.0398 · 47.6s

Stated plan

Grab the a2 pawn with check, escaping the queen's attack on the knight while gaining material.

Reasoning

The knight on b4 is currently hanging to the queen on b5. Instead of retreating passively, Black can play Nxa2+, winning a pawn with check (the knight attacks c1 from a2). White's king must move (Kb1 or Kc2), and the knight on a2 is then safe from immediate capture since it's not adjacent to either king square, netting Black a clean pawn while escaping the attack on the knight.

Claims extracted from it

4 true · 2 false · 0 unverifiable

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

  • True

    The knight on b4 is hanging to the queen on b5

    attackedsquare=b4by=white

  • True

    Black can play Nxa2+, winning a pawn with check

    linemoves=Nxa2+assertion=type:gives_check

  • True

    Nxa2+ wins a pawn

    linemoves=Nxa2+assertion=type:captures_piece piece:pawn

  • False

    The knight attacks c1 from a2

    controls_squaresquare=c1by=black

  • True

    After Nxa2+ White's king must move

    lineprefix=playedmoves=Nxa2+assertion=type:forced_reply pattern:king

  • False

    After Nxa2+ and White's king moves (Kb1 or Kc2), the knight on a2 is safe from immediate capture

    lineprefix=playedmoves=Nxa2+ Kb1/Kc2assertion=type:material_delta side:black min_value:1