Black to play. This is from Karjakin-Svidler, Fidé World Cup, Baku 2015. The position occurred earlier in the third game detailed above. Black played 1 … b4, missing something much stronger. What should he have played? Answers to me at The Spectator by Tuesday 20 October or via email to victoria@spectator.co.uk. The winner will be the first correct answer out of a hat, and each week there is a prize of £20. Please include a postal address and allow six weeks for prize delivery.

Last week’s solution 1 Qxf4

Last week’s winner John Briggs, Whickham, Newcastle upon Tyne