Reasoning eval · Puzzle v8JXi
0 of 3 models found the move, and said 13 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.
- Rating
- 2488(2400 band)
- Solution
- g8e8 c1f4 e8e6 f4d6 e6d6
- Motifs
- advantagelongmiddlegame
- FEN
- 2k3rr/pb4p1/1p1bN3/3p3q/PP6/2PQ2P1/5R1P/R1B3K1 b - - 0 25
Stated plan
Play Bxg3, since recapturing with hxg3 allows Qh1+ with an inescapable mate, while any other response simply loses material.
Resolves to d6g3 · −1503cp
Reasoning
Black's bishop on d6 sits on the same dark diagonal as g3 and h2 (d6-e5-f4-g3-h2). Playing Bxg3 wins a pawn. If White recaptures with hxg3, the h-file opens completely and Qh1+ becomes unstoppable checkmate: the king can't take (rook on h8 guards h1 through the now-open file), can't go to f1 or g2 (both covered by the queen), and f2 is blocked by White's own rook. So White is forced to avoid hxg3, e.g. by moving the rook off f2, but then Black simply keeps an extra pawn and a monster bishop, or even wins the rook with Bxf2+ if White ignores it. This is clearly winning material or forcing mate.
Claims extracted from it
4 true · 6 false · 1 unverifiable
Hover a claim to light up the squares it is about.
- True
Black's bishop on d6 sits on the dark diagonal d6-e5-f4-g3-h2
piece_on_squaresquare=d6piece=bishopby=black
- True
Playing Bxg3 wins a pawn
linemoves=Bxg3assertion=type:captures_piece piece:pawn
- True
If White recaptures with hxg3, Qh1+ is checkmate
lineprefix=playedmoves=Bxg3 hxg3 Qh1+assertion=type:is_mate
- False
The king can't take on h1 because the rook on h8 guards h1 through the open h-file
defendedsquare=h1by=black
- False
The king can't go to f1 because it's covered by the queen
controls_squaresquare=f1by=black
- False
The king can't go to g2 because it's covered by the queen
controls_squaresquare=g2by=black
- True
f2 is blocked by White's own rook
piece_on_squaresquare=f2piece=rookby=white
- False
White is forced to avoid hxg3
lineprefix=playedmoves=Bxg3assertion=type:forced_reply
- False
If White moves the rook off f2, Black simply keeps an extra pawn and a monster bishop
lineprefix=playedmoves=Bxg3assertion=type:material_delta side:black min_value:1
- False
If White ignores the bishop, Black wins the rook with Bxf2+
lineprefix=playedmoves=Bxf2+assertion=type:captures_piece piece:rook
- Unverifiable
This is clearly winning material or forcing mate
unverifiable