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| Black has just captured on f4 in Vladimir Koci (1607) - Spanton (1854), Mariánské Lázně (Czechia) 2020. Who stands better, and by how much? |
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Neither side has an advantage, according to the analysis engines Stockfish12 and Komodo12.1.1.
50.Kd4 Ng6 51.a3 Kd6 52.Bg3+ f4!?
White can now gang up on this pawn, but Black should be fine as long as pressure is kept on h4.
53.Be1
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53...Ne5?
My original notes show I somehow thought I was winning the f3 pawn.
Correct is 53...Ke6, or a similar move that allows Black to meet 54.Ke4 with 54...Kf6 (or 54...Ke6), preventing 55.Kf5.
54.Ke4 Ke6
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55.a4
Not 55.Kxf4?? Nd3+. But the engines point out the winning 55.Ba5!, eg 55...Ng6 56.Bd8, when Black is in zugzwang.
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55...Kd6?
Black holds the draw with 55...Ng6.
56.Bc3 Ng6 57.Bf6 Ke6 58.Bg5 Kf7 59.Kd5 Kg7 60.Kc5 Ne5
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61.Bxf4??
Winning easily is 61.Kb6 Nxf3 62.Bxf4 Nxh4 63.Kxa6, when the bishop stops the h pawn queening and the knight cannot interfere with the a pawn.
61...Nd3+ 62.Kb6 Nxf4 63.Kxa6
Despite the blunder at move 61, the position is dead-equal, according to the engines, but a position in which it is easy for either player to go wrong.
63...Kf6 64.Kb5 Nd5 65.Kc5 Ke6 66.a5 Nc7 67.Kd4 Na6 68.Kc4 Kd6 69.f4 Nc7 70.Kd4 Nb5+ 71.Kc4 Kc6 72.Kb4 Nd6
Here just one move draws for White.
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73.a6
White had to play 73.Kc3!, when one drawing line among many runs 73...Kd5 74.a6 Ke4 75.Kb4 Nc8 76.Kc5 Kxf4 77.Kc6 Kg4 78.Kb7 Nd6+ 79.Kb8 Nb5 80.Kb7 Kxh4 81.Kb6 Nd6 82.Kc6 Nc8 etc.
73...Nf5 74.Kc4 Nxh4 75.Kd3 Nf5 76.Ke2 Kb6 77.Kf3 Kxa6 78.Ke4 h4
The game finished:
79.Kxf5 h3 80.Ke6 h2 81.f5 h1=Q 82.f6 Qe4+ 83.Kd6 Qb4+ 84.Ke6 Qf8 85.Ke5 Qf7 0-1
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