no. 509
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Black to play. This is from Pillsbury-Lasker, St Petersburg 1895/96. Black has sacrificed two rooks for a bishop to drive the white king into the open. What is the correct move to conclude the attack? Answers to me at The Spectator by Tuesday 12 June or via email to 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 ... Be4+ (2 Kf1 Bf5)

Last week’s winner Douglas Morrison, Cambridge