no. 540
Text settings

Black to play. This position is from Kasparov-Kramnik, Dos Hermanas 1996. Kramnik played 1 ... Qh1+ and soon won. But he could have forced mate here. What is the key move? Answers to me at The Spectator by Tuesday 12 February or via email to 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 ... Rxc3+

Last week’s winner Jay Patel, London SW18