Black to play. This is from Pichot-Khismatullin, Moscow 2016. What was Black’s killing blow? Answers to me at The Spectator by Tuesday 5 April or via email to victoria@spectator.co.uk or by fax on 020 7681 3773. 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 Rc7

Last week’s winner Oliver McEvoy, Elstree, Herts