Reasoning eval · Puzzle o6dAa

2 of 3 models found the move, and said 11 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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a
SolutionPlayedBlack to move
Rating
1987(2000 band)
Solution
h3h2 b2b8 h2h1q b8g8 h1g2 g8g2 g1g2
Motifs
advancedPawncrushingendgameexposedKingpromotionveryLong
FEN
8/2p5/3p4/3P4/4N3/7p/1R2K3/5rk1 b - - 7 56
MissedPlayed f1f2(lost a forced mate)Claims true 25%1598 out · $0.0166 · 20.6s

Stated plan

Deliver Rf2+ to win the white rook by discovered attack along the second rank.

Resolves to f1f2 · lost a forced mate

Reasoning

56...Rf2+! attacks the king on e2 along the second rank while also lining up against Rb2. The king cannot capture (f2 is guarded by Kg1) and must step off the second rank or file f, after which Rxb2 wins the rook for free.

Claims extracted from it

1 true · 3 false · 2 unverifiable

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

  • False

    Rf2+ attacks the king on e2

    attackedsquare=e2by=black

  • Unverifiable

    Rf2+ lines up against Rb2

    unverifiable

  • Unverifiable

    f2 is guarded by Kg1

    defendedsquare=f2by=g1

  • True

    After Rf2+, the king cannot capture on f2

    lineprefix=playedmoves=Rf2+assertion=type:king_cannot_go square:f2 side:white

  • False

    After Rf2+, the king must step off the second rank or file f

    lineprefix=playedmoves=Rf2+assertion=type:forced_reply

  • False

    After Rf2+ and the king moves, Rxb2 wins the rook for free

    lineprefix=playedmoves=Rf2+ K- Rxb2assertion=type:captures_piece piece:rook