Black and White

angelini retrograde problem 1

A logic problem in the shape of a chess puzzle, by Éric Angelini. White has just moved. What was his move?

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At first this appears impossible — the king must just have moved, but from where? Every possibility seems to require an impossible double check. But there is a legal sequence involving a discovered check and an en passant pawn capture. Play must have started from this position: Now 1. … Ne5+ 2. g4 fxg3+ e.p. 3. Kxe5. From Europe Echecs, April 1995.