Black to play. This is from Caruana-Jakovenko, Khanty-Mansiysk 2015. Black is winning -easily, but can you find the most accurate continuation, which forces mate in six moves at the most? Answers to me at The Spectator by Tuesday 9 June 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 … Rxf2+

Last week’s winner D.W. Benson, Longdon, Tewkesbury, Glos