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In chess, pion coiffé is the handicap of undertaking to make the mating move with a particular pawn, which is usually marked at the start of play. It is usually required that the pawn not be promoted.
Pietro Carrera proved that in the endgame K+Q+P v K (pion coiffé), a win can be forced unless the pawn lies on a centre file. Carrera considered pion coiffé to be about equivalent of giving odds of a queen.