no. 478
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White to play. This position is from the above game, Praggnanandhaa-Howell, Masters. What is the accurate move White needed to play here? Answers to me at The Spectator by Tuesday 17 October 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 Rxa3

Last week’s winner Gerry Devenney, Edinburgh