Black to play. Sigurjonsson-Timman, Wijk aan Zee 1980. Timman has sacrificed a rook to open up White’s king. His next move was a decisive blow. What did he play? Email answers to chess@spectator.co.uk by Monday 2 March. There is a prize of a £20 John Lewis voucher 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 c8=N! and then 1…Kxc8 2 Ba6 mate or 1…Ka8 2 Bc6 mate.
Last week’s winner Alan Bekhor, London NW8
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