no. 514
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Black to play. This is from Karpov-Korchnoi, Dortmund 1994. In this unusual position Karpov has two queens but Korchnoi’s forces coordinate much more efficiently. His next move led to a decisive material gain. Can you see it? Answers via email to by Tuesday 17 July. There is a prize of £20 for the first correct answer out of a hat. Please include a postal address and allow six weeks for prize delivery.

Last week’s solution 1 Bxf6

Last week’s winner Stuart Perry, London SW4