White to play. This is from Korchnoi-Karpov, Candidates Final, Moscow 1974. White’s next move destroyed the black position and led to one of Karpov’s quickest ever defeats. What did White play? Answers to me at The Spectator by Tuesday 21 June or via email to victoria@spectator.co.uk. 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 … Qxc4 (2 Bxc4 Bxc3+ 3 Qb2 Bxe1! 4 Bxe2 Bg3)

Last week’s winner Mick Beirne, London E7

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