White to play. Duda-Grandelius, Fide Olympiad, Samarkand, 2026. Duda soon won, but missed the strongest move in this position. Which move wins the game in style? Email answers to chess@spectator.co.uk by Monday 5 October. There is a prize of a £20 John Lewis voucher 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 Bf3! Then 1…Kxf3 2 Nd4#, 1…Kxg5 2 Ne4#, 1…Ke5 2 Ne8# or 1…gxf5 2 Rfxf5#
Last week’s winner John Roaf, Enfield
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