Saturday 20 March 2021

Knight v Bishop (part 65)

SO far I have covered those bishop-v-knight endings from my praxis that began with seven, six, five or four pawns aside but did not end in draws (there were none starting with eight pawns aside).
The player with the knight won the seven-pawn endings by the narrow margin of 9-8, the six-pawn endings by the wide margin of 21-7 and the five-pawn endings by the narrow margin of 7-6.
The player with the bishop won the four-pawn endings 5-1
Taking all four sets of endings, the knight leads the bishop by 38-26.
I now move to bishop-v-knight endings that had three pawns aside but did not end in draws.
White has just captured on d4 in Spanton (147) - K Majewski (131), Barbican (London) Major 1990. Who stands better, and by how much?
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White is winning, but the black passed pawn means the win is not as completely trivial as it might look.
47...Bg6 48.f7 Bxf7 49.Nxf7 h5 50.Ne5+ Kf4
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51.Kd5?
This allows a draw. Winning are 51.a4 and 51.Ng6+.
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51...a4
Not 51...h4? 52.Ng6+ Kg3 53.Nxh4.
But drawing, as Stockfish12 and Komodo12.1.1 point out, is 51...Ke3!, eg 52.Kxc4 h4 53.Kb5 h3 54.Ng4+ (if 54.c4? then 54...Kf4 wins for Black) Kf3 55.Nh2+ Kg2 56.c4 Kxh2, after which both sides queen and the game is drawn.
52.Kd4 Kf5 53.Nxc4 h4 54.Ke3 Kg4 55.Kf2 Kf4 56.Nb6 Ke4 57.Nxa4 Kd3 58.Nb2+ Kxc3 59.a4 (1-0, 77 moves)

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