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| Black has just captured on d6 in Iozeph Okosieme (140) - Spanton (164), Middlesex League Division 2 1992. Who stands better, and by how much? |
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Stockfish12 reckons White is winning; Komodo12.1.1 gives White the upper hand (+1.09).
33.Kf2
But this throws away nearly all the advantage, according to the engines, who want White to play 33.a3! Then best-play, according to the engines, goes something like 33...Ke6 34.Nc1 Bc4 35.Na2! followed by 36.Nb4, the point being 35...Bxa2?? fails to 36.a6 etc.
33...Ke6 34.Ke3 Ba6!?
The engines prefer 34...Bc4 or 34...Bf1.
35.Kd2
The engines reckon 35.Na1!? gives a slight edge, eg 35...Kd7 36.Nc2 with Nb4 to come.
35...Kd7 36.Kc3 Kc6 37.Kb4!?
This leaves the king dangerously distant from the kingside. The engines prefer 37.Na1 or 37.a4.
37...g5 38.a4?
Even worse is trying to hold up Black's pawn-majority with 38.g4? as Black has 38...Be2, and if 39.h3 then 39...Bf1. The engines suggest 38.Nd2 or 38.g3.
38...f5 39.Kc3 Kd7?
Too slow. The engines give 39...f4 or 39...Kb7!? The point of the latter is so the bishop is protected when it is later hit by the knight.
40.Na1!?
Heading for b4.
40...h5 41.Nc2 f4 42.Kd2 Ke6?
It is wrong to desert the queenside. The engines reckon 42...h4 and 42....Bf1 keep the balance.
43.Nb4 Bb7 44.a6 Ba8 45.Ke2 g4 46.h3
I now sealed ...
46...Kf5
... which the engines reckon is Black's best try.
47.a7
According to the engines, winning is 47.hxg4+ hxg4 48.Kd3!
47...Bb7 48.hxg4+ hxg4 49.a5 Ke4 50.a6 Ba8 51.Nc2
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51...g3?
Drawing, according to the engines, is 51...f3+ 52.gxf3+ gxf3+ 53.Kd3 or 53.Bc6.
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52.Na3
White wins with 52.Kf1!, according to the engines, eg 52...Kd3 53.Na3 Kxd4 54.Nb5+ and 55.Nc7, or 52...Bc6 53.Kg1! Kf5 (best, according to the engines) 54.Nb4 Ba8 55.Na2, when White threatens 55.Nc3 Bc6 56.Na4! and 57.Nb6. Black can stop this by withdrawing the black king to the queenside, but then the white king picks off Black's kingside pawns.
52...Bc6
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53.Ke1?
White cannot play an immediate Nb5 to divert the bishop as ...Bxb5 comes with check, so the idea of the text is to set up Nb5, but it does not work. White holds the draw by 53.Nc2 or, as the engines point out, by rather more-elaborately promoting the a7 pawn, eg 53.a8=Q!? Bxa8 54.Nb5 Bc6 55.Nxd6+ Kxd4 56.Kf3 Ke5 57.Nf7+ Kf5 58.Nd6+ Ke6 59.Nc8 d4+ 60.Kxf4 d3 61.Ke3 Bxg2 62.Kxd3 Bf1+ 63.Ke3 etc.
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53...Ke3?
I cannot recall but I presume I rejected the winning 53...Kxd4 because of 54.Nb5+, but the engines point out 54...Ke4 55.Nc7 f3 as easily winning.
54.Nc2+ Ke4 55.Kf1 Ba8 56.Kg1
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56...Kd3?
56...Bc6 holds the draw.
57.Na3 Kxd4 58.Nb5+ Ke3
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59.Nxd6??
This turns a win into a loss. Correct is 59.Nc7 d4 60.Nxa8 d3 61.Nb6 d2 62.Nc4+ etc.
59...d4 60.Nc4+ Ke2 61.Nb6 d3 62.Na4 d2 63.Nb2 d1=Q+ 64.Nxd1 Kxd1
The game finished:
65.Kf1 Kd2 66.Kg1 Ke2 67.Kh1 Kd3 68.Kg1 Kc4 69.Kf1 f3 70.gxf3 Bxf3 71.Ke1 Kb5 72.Kd2 g2 73.Ke3 g1=Q+ 74.Kxf3 Qxa7 0-1
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