Saturday, 30 January 2021

Knight v Bishop (part 16)

Black has just captured on e8 in Spanton (1859) - Thorsten Meyer (2028), Malta (BuÄĦibba) 2017. Who stands better, and by how much?

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White has more space in the centre, but the bishop is at least semi-bad thanks to the white queenside pawns that are fixed, or at least semi-fixed, on light squares. Stockfish12 reckons the position is equal; Komodo11.01 gives White a slight edge.
22.f3 g6 23.Kf2 Nf6 24.Ba4 Kf8 25.Ke3 Ke7 26.a3 b6 27.b4 axb4 28.axb4 Ng8 29.g4 Nh6 30.Bc2 Kf6 31.h4 Ng8 32.g5+ Ke7 33.h5!?
The engines reckon White is slightly better after 33.f4 or 33.Kd4.
33...Kf8 34.h6 Ne7 35.Kd4 f6 36.gxf6!?
A simpler way to maintain the balance is 36.f4, but the text should result in equality too.
36...Nf5+ 37.Ke4?
Correct is 37.Bxf5 gxf5, when 38.f4 is a simple draw, but also equal is 38.Kc3!? Kf7 39.Kb3 Kxf6 (not 39...Kg6 40.Ka4 Kxh6? - taking the f pawn still draws - 41.Kb5 Kg6 42.Kc6 h5 43.Kxc7 h4 44.Kxf6 Kc7 45.h3 d6 46.h2 d7 47.h1=Q d8=Q+, when White is winning, according to the engines) 40.Ka4 f4 41.Kb5 Ke7 42.Kc6 Kd8.
37...Nxh6 38.Kf4 Kf7 39.Kg5 Ng8 40.b5 h6+ 41.Kf4 Kxf6
Black is winning easily. The game finished:
42.Bd3 Kf7 43.Kg3 Nf6 44.Kh4 Nd7 45.f4 Kf6 46.Kg4 g5 47.Be2 Nc5 48.fxg5+ hxg5 49.Bd1 Nd3 50.Be2 Ne5+ 51.Kh5 g4!? 52.Kh4 Kf5 53.Kg3 Ke4 54.Bf1 Kd4 55.Kf4 Nxc4 56.Kxg4 Ne3+ 0-1

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