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| Black has just captured on d4 in Eduardo Bauza Mercere (1932) - Spanton (unrated), World Open (Philadelphia) 1993. What should the result be? |
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The position is drawn, although engines disagree as to whether Black has a theoretical advantage. Stockfish12 reckons the position is dead equal, but Komodo11.01 gives Black a slight edge, which surely must be right, considering Black is a pawn up.
35.Be4 Bd6+ 36.Kg4!
There is no need to protect the h2 pawn if White can win the g pawn in exchange.
36...h6 37.h3 Kg7 38.Kf5 Bf4 39.Bd3 Kf8 40.Kf6 Bd6
The only move not to lose.
41.Kg6 Bf4 42.Kf6
Not 42.Kxh6? g4+.
42...Bd6 43.Kg6 Ke7 44.Bc4 Bf4 45.Kf5 h5 46.Be2
46.h4 Be3 47.hxg5 h4 48.g6 Bh6 49.Kg4 Kf6 is also drawn.
46...h4 47.Bc4 Be3 48.Ke5?
Shuffling the bishop, eg 48.Be2, draws, as does 48.a4.
48...g4!
Black gives back his extra pawn to create a second passed pawn. Two passed pawns in different sectors of the board - here the kingside and the centre - are often enough to win in opposite-coloured-bishop endings.
49.hxg4
Other moves, eg 49.Ke4 and 49.Bf1, also lose fairly trivially, as a little investigation shows, eg 49.Ke4 g3 (49...gxh3 also wins) 50.Kf3 Bg5 51.Ke2 Kd6 52.Kf3 Kc5 53.Bd3 Kd5 54.Bf5 Kc4 55.Ke2 Kc3 56.Be4 d3+ 57.Kd1 Kd4 58.Bc6 Ke3 59.Ke1 d2+ 60.Kd1 Kf2 etc.
49...h3 50.g5 h2 51.Bd5 d3 52.g6 Bh6 0-1
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