White to play. Reshevsky-Savon, Petropolis 1973. Reshevsky played the awful 1 Qxg6+, and resigned after 1…Bxg6. Many moves win, but which one forces mate in just three moves? Email answers to chess@spectator.co.uk by Monday 9 May. There is a prize of £20 for the first correct answer picked. Please include a postal address.

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