White to play. This is a position from Carlsen-Shirov, Biel 2011. Can you spot Carlsen’s crushing blow? Answers to me at The Spectator by Tuesday 15 November or via email to victoria@spectator.co.uk. 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 … g5
Last week’s winner Mark Nottingham, Ramsgate, Kent