Lessons From Bad Bertrich: Learn From Your Defeats

MY round-three game reached the following position after White's 9.Qh5-f3.

Black to play in Spanton (1946) - Uwe Single (1810)

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Material is level, but there is no doubt Black is in trouble as White threatens 10.Qxb7 as well as the terminal 10.Qxf7#.
Black can prevent mate and develop a piece with 9...Nf6, when 10.Qxb7 Nbd7 11.Nc6 Qc8 12.Bxa6 wins two pawns, with the exchange likely to follow.

Alternatively Black can try 9...f6, when, rather than immediately take on b7, best seems to be 10.Bc4 e6, and now 11.Qxb7.

After the further moves 11...fxe5 12.Qxa8 exd4, Black is 'only' down the exchange, but 13.0-0 (also good is 13.Bxe6) leaves Black in a very unenviable position.

However, there is many a slip 'twixt cup and lip, and the one continuation I was not expecting was the game's 9...Resigns.

LESSON: Few of us enjoy defending rotten positions, but the one way to ensure you never become good in such situations is to give up without trying.