White to play. This is from Pacher-Radnai, Budapest 2016. How did White exploit a tactical opportunity to make a decisive material gain? Answers to me at The Spectator by Tuesday 10 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 f8Q+

Last week’s winner John Samson, Edinburgh