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| White has just captured on d1 in Spanton (1954) - Michael Schuh (1829) |
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Black played 19...f5?, presumably on the ground that driving back the white knight while gaining space must be good.
But the engines reckon the resulting position is equal, and Black went on to lose the game.
Instead it makes perfect sense to play 19...Bxe4, which White has to answer with 20.fxe4.
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| Black's winning position |
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Exchanging on e4 is sound positionally and tactically.
True, from the positional viewpoint, White is left with what is usually the better minor piece for cooperating with a rook.
But here that factor is completely outweighed by the fact White has a bad bishop against a knight, which has a strong outpost on e5 and may well later occupy another strong outpost at d4 (if Black gets in ...c5).
Tactically, the situation is even more straightforward: Black wins a pawn after continuing 20...Rd8+ and 20...Rd4.
LESSON: when a move is both positionally and tactically advantageous, the chances are good that it is the best move.
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