The first problem in which a single black and single white pawn were involved in the promotions was by Henry Wald Bettmann, and won 1st prize in the Babson Task Tourney 1925–26.
Den første selvmatopgave, hvor en enkelt sort og en enkelt hvid bonde blev forvandlet, var udarbejdet af Henry Wald Lettmann og vandt førstepræmie i Babson Task Tourney 1925-26.