
Black to play. Siva Mahadevan-Nikita Vitiugov. White is attacking the f7-pawn, but Vitiugov’s next move won him the game. What did he play? Email answers to chess@spectator.co.uk by Monday 18 August. There is a prize of £20 for the first correct answer out of a hat. Please include a postal address.

Last week’s solution 1 Bb8! uses a back-rank mate trick to target d7 and a8. White wins, e.g. 1…Rxe1+ 2 Rxe1 Qc8 3 Qxa8, and if 3…c2 4 Rc1 Bb2 5 Rxc2!
Last week’s winner Keith McCloskey, Hungerford, Berkshire
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