No. 717

White to play. Gormally–Claridge-Hansen, British Championships 2022 Black’s last move, Ra8-a7,was a fatal mistake. Which move won the game for White? Answers should be emailed to chess@spectator.co.uk by Monday 29 August. 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…Rg3! 2 Qxg3 Rxf1+ 3 Kh2 Ng4+ 4 Kh3 Rh1+ 5 Kg2 Rg1+ wins. But not 1…Qc8 2 Rf3! and White survives

Last week’s winner Aaron Milne, Northwich, Cheshire