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| Black has just captured on f4 in S Rychkov (1979) - Spanton (2083), 2009 IECG Cup Quarter-Finals (correspondence chess) 2011. How big is White's advantage? |
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Both Stockfish12 and Komodo11.01 reckon White has the upper hand - an advantage of about nine-tenths of a pawn.
31.h3 Bc7 32.Kf3 Kf8 33.Ke4 Ke7 34.Kd5 Kd8
I see from my original notes Fritz11 rated the position as drawn. However my modern analysis engines give White a large, but not winning, advantage.
35.Ba6 Bb6 36.f4!?
Stockfish12 does not like this but Komodo11.01 is happy enough. The former suggests 36.Kd6 Ba5 37.a3 Bc7+ 38.Kc5 Ba5 39.Bd3 h5!? 40.a4 Kc7, but it is not clear how White makes progress.
36...f5?
This is very weakening. The engines prefer 36...g6!? 37.f5 Ba5, when Black looks reasonably solid.
37.Ke6 g6 38.Kf7 Bc7 39.Kg7 Ke7 40.Kxh7 Kf6 41.Kg8 Bxf4
I cannot recall but I guess this must have been the position I was aiming for when I made my 36th move; however, Black is lost.
42.Bc8 Ke7
Worse is 42...g5 43.Kf8 Ke5 when 44.Bxf5!? is pretty (but the engines prefer 44.Ke7). Black is winning in either case.
The game finished:
43.Kg7 Bg3 44.Kxg6 Kd6 45.Bb7 f4 46.Kf5 f3 47.Kg4 f2 48.Ba6 Be5 49.Bb5 Bc3 50.h4 Ba5 51.Kf5 1-0
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