White to play. This is a position from Bjornsson-Sigurdsson, Iceland Team Championship 2016. How did White make the most of his passed pawn on f7? Answers to me at The Spectator by Tuesday 3 May 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 Nd5

Last week’s winner Patrick Staunton,

London NW1