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 firstname.lastname@example.org 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.
Last week’s solution 1 Qa8! If 1…Ra1 2 Qxa1#, while any knight moves are met with Ne2# or Nd3#.
Last week’s winner Mark Snell, Hove, Sussex
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