White to play. Bibisara Assaubayeva-Rakshitta Ravi, Delhi 2019. Assaubayeva is down a bishop for two pawns, but she had aimed for this position, foreseeing a knockout blow. Which move did she play? Email answers to chess@spectator.co.uk by Monday 30 January. There is a prize of £20 for the first correct answer out of a hat.

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