White to play, Black to win. Shirov-Caruana from the Isle of Man. Caruana threatens 53… d1=Q 54.Qxd1 Qxb2 mate. Shirov resigned, rather than try 53.Bf7-b3 to block the b-file. What finishing touch had he foreseen for Caruana? Difficulty: Moderate. Answers via email to victoria@spectator.-co.uk by Tuesday 22 October. There is a prize of £20 for the first correct answer out of a hat.