White to play and win. E. Pogosjants, Shakhmaty v SSSR 1976. Promoting the a-pawn allows Black a perpetual check. Which move wins the game? Answers should be emailed to chess@spectator.co.uk by Monday 30 December. 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.
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