No. 691
From our UK edition
Black to play. Maric-Gligoric, Belgrade 1962. White has offered to exchange the rooks on f5 and c3. But Gligoric found a much stronger shot, prompting instant resignation. What did he play? Answers should be emailed to chess@spectator.co.uk by Monday 28 February. There is a prize of £20 for the first correct answer out of a