no. 521
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White to play. This is from Mamedyarov--Georgiadis, Biel 2018. Many of Mamedyarov’s games feature a kingside attack based upon a powerful bishop on the b2-square. Here, his next move led to a decisive increase in pressure against the black king. What was it? Answers to by Tuesday 4 September. 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 Qxd3

Last week’s winner James Payne, Barnby, Suffolk