no. 501
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White to play. This is from Bluebaum-Anand, Grenke 2018. Anand has been having a rough time in the elite Grenke tournament. What was the subtle move that allowed his opponent to create intolerable pressure in this endgame? Answers via email to by Tuesday 17 April. 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 Nxa7

Last week’s winner Martin Axworthy, Cheltenham, Gloucestershire