Black to play. This position is from Kasparov-Kramnik, Dos Hermanas 1996. Kramnik played 1 … Qh1+ and soon won. But he could have forced mate here. What is the key move? Answers to me at The Spectator by Tuesday 12 February or via email to victoria@spectator.co.uk. There is a prize of £20 for the first correct answer out of a hat.

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