Mastrovasilis–Marechal, Cappelle la Grande 2011. Black is a whole rook up, so his last move 34… Nd5-e7, angling for an exchange of knights, looks plausible. Which move did White play to expose a hidden flaw? Answers should be emailed to chess@spectator.co.uk by Monday 11 January. There is a prize of £20 for the first correct answer out of a hat.

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