Black to play. This position is from Basman-Keene, Slater Tournament, Southend 1968. How can Black quickly gain a decisive advantage? Answers to me at The Spectator by Tuesday 1 December or via email to victoria@spectator.co.uk or by fax on 020 7681 3773. 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 … Qxd4

Last week’s winner Bernard Golding, Newcastle upon Tyne