Ah, the (almost) inexhaustible riches of chess! A reader sends us to Volokh where we read:
An interesting thing happened yesterday in a game between my son and my father: a double check, in which the moved piece was not one of the checking pieces. (In a usual double check, a piece moves, placing the king in check but also discovering a check by another piece. To quote a formulation on the U.S. Chess Federation Site, “Double check is a more dangerous form of a discovered check where not only the hidden piece attacks the king, but also the piece that moves.”) How did this happen? Everyone was following the normal rules of chess.
Here is how it can happen.
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