White to play. This is from Karjakin-Nakamura, Fidé Candidates, Moscow 2016. Hikaru -Nakamura has just implemented an ingenious combination to win material, but he has not foreseen White’s counterattack. What has he missed? Answers via email to victoria@spectator.co.uk, by Tuesday 29 March. 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 Rff8
Last week’s winner Peter Musiol, Gateshead