Reasoning eval · Puzzle A0jOX

1 of 3 models found the move, and said 7 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
1166(1200 band)
Solution
e5e1 f2e1 f8f1
Motifs
endgamemastermatemateIn2sacrificeshort
FEN
5rk1/p5pp/b3p3/2Ppq3/8/P7/1PQ2BPP/4R1K1 b - - 1 23
MissedPlayed f8f2(lost a forced mate)Claims true 80%1938 out · $0.0201 · 24.1s

Stated plan

Sacrifice the rook on f2 to remove the defender of e1, then win the rook with the queen with check.

Reasoning

The black queen on e5 eyes e1 through an open file, but the rook is defended by the bishop on f2. By sacrificing Rxf2, Black forces Kxf2 (since the bishop is otherwise lost for nothing), and then Qxe1+ wins the rook with check, netting bishop+rook for a rook - a clear material gain.

Claims extracted from it

4 true · 1 false · 0 unverifiable

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

  • True

    The black queen on e5 eyes e1 through an open file

    controls_squaresquare=e1by=black

  • True

    The rook is defended by the bishop on f2

    defendedsquare=e1by=f2

  • False

    By sacrificing Rxf2, Black forces Kxf2

    lineprefix=playedmoves=Rxf2 Kxf2assertion=type:forced_reply

  • True

    After Rxf2 Kxf2, Qxe1+ wins the rook with check

    lineprefix=playedmoves=Rxf2 Kxf2 Qxe1+assertion=type:gives_check

  • True

    After Rxf2 Kxf2 Qxe1+, Black nets bishop+rook for a rook

    lineprefix=playedmoves=Rxf2 Kxf2 Qxe1+assertion=type:material_delta side:black min_value:3