Black to play. Gukesh-Giri, Wijk aan Zee, 2025. With less than a minute, Giri erred and lost here. Which move would have won him the game? Email answers to chess@spectator.co.uk by Monday 27 January. There is a prize of a £20 John Lewis voucher for the first correct answer out of a hat. Please include a postal address.

Last week’s solution 1 Qxd5! exd5 2 Re8+ Bf8 3 Rxf8+ Kxf8 (or 3…Kg7 4 Rxf7+ Qxf7 5 Nxf7 Kxf7 6 hxg6+) 4 Nh7+ Kg7 5 Nxf6 Kxf6 6 h6! wins
Last week’s winner Stephen Belding, Rugby, Warwickshire
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