Reasoning eval · Puzzle Wtctx

1 of 3 models found the move, and said 14 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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h8
g
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d
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b
a
SolutionPlayedBlack to move
Rating
1255(1200 band)
Solution
f8f2 g2h3 f1h1
Motifs
endgameforkmatemateIn2short
FEN
5rk1/4b1p1/3P3p/p1p5/2PpR1QP/1P4P1/P2N2K1/5r2 b - - 0 27
MissedPlayed f1f2(lost a forced mate)Claims true 25%1814 out · $0.0188 · 22.6s

Stated plan

Play Rf2+ to force the king away, then capture the undefended knight on d2.

Reasoning

The rook on f1 can check the king along the 2nd rank with Rf2+. The king cannot capture (f2 is defended by the rook on f8 along the f-file) and has no blocking piece, so it must step aside to g1, h2 or h3. This clears the way for Rxd2, winning the knight for free since nothing defends d2.

Claims extracted from it

1 true · 3 false · 1 unverifiable

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

  • False

    The rook on f1 can check the king along the 2nd rank with Rf2+

    linemoves=Rf2+assertion=type:gives_check

  • Unverifiable

    f2 is defended by the rook on f8 along the f-file

    defendedsquare=f2by=f8

  • False

    After Rf2+ the king must step aside to g1, h2 or h3

    lineprefix=playedmoves=Rf2+assertion=type:forced_reply pattern:king

  • False

    After Rf2+ and the king moves, Rxd2 wins the knight

    lineprefix=playedmoves=Rf2+ Kg1/Kh2/Kh3 Rxd2assertion=type:captures_piece piece:knight

  • True

    Nothing defends d2

    defendedsquare=d2negated=true