I guess another way to look at it is that both players deserved to lose.
Anyway, here is the first critical position:
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| Black to make his 23rd move in Einora Juciute (1760/154) - Spanton (1890/171) |
*****
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23...h6??
Black wins easily after 23...Bxf1. The point is that Black's king is much safer than it might seem at first glance, eg 24.Nf6+ gxf6 25.Qxh7+ Kf8. The annoying part is that I had earlier seen this idea of running away with the king, but promptly forgot when the position actually arose on the board.
24.Nf6+ gxf6??
This should lose. Correct was the calm 24...Kh8 when there seems no way for White to crash through. My main analysis engines Stockfish10 and Komodo9 agree the main line is 25.Be4 Bxf1 26.Rxf1 Qe6 27.Bxa8 Rxa8 28.Rd1 Bf8, both giving Black a slight edge. There are more than a few plausible alternatives in that line, but the important thing is that it is still a game, while after the text Black is lost.
25.Qxh6 Bd3 26.exf6 Bf8 27.Qg5+ Kh8 28.Qh5+ Kg8 29.Qg5+ ½–½
White is a pawn up and with much the safer king after descending the ladder with 29.Qg4+ Kh8 30.Qg4+ Kg8 31.Qg3+ Kh8 32.Bxd3 Qxf6. Black would play on, but White should win.
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