Black to play. Ansat–Lagarde, Fide Olympiad, Samarkand, 2026. White’s last move, 29 h4-h5 was a big mistake. Which move enabled Lagarde to gain a decisive advantage? Email answers to chess@spectator.co.uk by Monday 19 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.

Last week’s solution 1 Rh8+! Black resigned in view of 1…Kxh8 2 Nf7+ winning the queen.
Last week’s winner David Camp, Mitcham, Surrey
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