Black to play. This position is from Korchnoi–-Karpov, World Championship game 17, Baguio 1978. Can you spot Karpov’s dramatic finish? Answers to me at The Spectator by Tuesday 19 June or via email to firstname.lastname@example.org. 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 ... b5+
Last week’s winner Jeff Aronson, Oxford