White has just played Kf3-e3. Which response showed this to be a decisive mistake? Email answers to chess@spectator.co.uk by Monday 22 July. 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 Bd3! e.g. 1…Ne7 2 Qh8# or 1…c5 2 Qh1# or 1…Nb5 2 Rb1#.
Last week’s winner Rupert Cousens, Oxford
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