In the game of poker, the term cards speak ("for themselves") is used in two contexts:

First, it is used to describe a High-low split game without a declaration. That is, in a cards speak game, players all reveal their hands at the showdown, and whoever has the highest hand wins the high half of the pot and whoever has the lowest hand wins the low half.

The other context is a key rule in casino poker rooms. Cards speak means that any verbal declaration as to the content of a player’s hand is not binding. If Mary says she has no pair, but in fact she has a flush, her cards speak and her hand is viewed for its genuine value, that of a flush. Likewise if John says he has a flush, but in fact he does not, his hand is judged on its actual merits, not his verbal declaration. At the discretion of management, any player miscalling his hand may have that hand fouled, but this is not required.

The cards speak rule does not address the awarding of a pot, player responsibilities, or the one player to a hand rule. It merely means that verbal statements do not make a hand value. The cards do.