Black to play. Donchenko-Blübaum, German Championship Masters 2025. White threatens mate on the queenside. Which move allowed Blübaum to strike first on the kingside? Email answers to chess@spectator.co.uk by Monday 26 May. There is a prize of a £20 John Lewis voucher 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 Kg1! Rxg6 2 Kh1 is a draw, as intrusion of the rook leads to stalemate.
Last week’s winner Oliver Barnes, Newbury, Berkshire
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