no. 451
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White to play. This position is a variation from Portisch-Petrosian, Moscow 1967. Can you spot White’s winning coup? Answers to me at The Spectator by Tuesday 11 April or via email to 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 … Qxf2

Last week’s winner Charles Peck, London SW6