In game theory, the Waldegrave problem is a problem first described in the second edition of Pierre Raymond de Montmort`s Essay d'analyse sur les jeux de hazard, which is the first discussion of a mixed strategy to derive a solution in game theory. Montmort originally called Waldegrave's Problem the Problème de la Poulle or the Problem of the Pool. He provides a minimax mixed strategy solution to a two-person version of the card game le her.