White to play. This position is a variation from Bronstein-Zilberstein, Tbilisi 1973. Bronstein has just given up a piece on d5 but has a clever tactical idea in mind. Can you see the key move? Answers to me at The Spectator by Tuesday 7 April or via email to victoria@spectator.co.uk. The winner will be the first correct answer out of a hat, and there is a prize of £20. Please include a postal address.

Last week’s solution 1 … Na3+

Last week’s winner Graham Baker, Campsea Ashe, Suffolk