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| In this position from round four I am the exchange up and have the safer king |
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Nevertheless the black king is also menaced, and something must be done about the immediate threat to the black queen, while not simply dropping the black bishop.
Actually the threat to the bishop is not so great as the knight is also threatened. Once this is realised it is not so hard to find the engines' 27...Qc5! Since 28.Nxg7 achieves little, White must play 28.Bxe4, but 28...Qa3+ 29.Qb2 Qxb2+ 30.Kxb2 Rab8+ 31.Kc2 exf5 32.Bxf5 leaves White with only a pawn for the exchange, meaning Black is winning (Dragon1) or at least has the upper hand (Stockfish17).
A reasonable-looking try would have been 27...Qa5!?, or even 27...Qxd1+?!, both so much better than my 27...Qb7??, when 28.Nd6 gave White a huge winning advantage.
LESSON: unlike in most games and sports, where a single blunder, such as an own-goal in football, can be recovered from, in chess all the nice positional play in the world can be undone by a single blunder from which recovery is simply not feasible.
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