no. 533
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White to play. This is a variation from Caruana-Carlsen, World Championship, London 2018. White has sacrificed a piece in order to obtain a powerful central phalanx. What is the most effective way for him to continue? Answers to me at The Spectator by Tuesday 27 November 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 ... Qxc3

Last week’s winner Joseph Lo, London W5