Black to play. This is from Korchnoi-Karpov, World Championship (Game 17), Baguio 1978. Can you spot Black’s winning coup? Answers to me at The Spectator by Tuesday 25 November or via email to email@example.com or by fax on 020 7681 3773. The winner will be the first correct answer out of a hat, and each week I am offering a prize of £20. Please include a postal address and allow six weeks for prize delivery.
Last week’s solution 1 … Rxa3+
Last week’s winner Guy Herbert, London NW1
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