Le Her is a gambling

Gambling

Gambling is the wagering of money or something of material value on an event with an uncertain outcome with the primary intent of winning additional money and/or material goods...

 game, dating as far back as the 18th century.

Le Her is played with a standard deck of 52 cards

Playing card

A playing card is a piece of specially prepared heavy paper, thin cardboard, plastic-coated paper, cotton-paper blend, or thin plastic, marked with distinguishing motifs and used as one of a set for playing card games...

 by two people, designated the dealer and the receiver. King is ranked high and ace low.

To play the dealer gives one card to the receiver and one to the dealer. The receiver may choose to exchange cards with the dealer, unless the dealer has a king in which case no exchange occurs. Then the dealer may choose to exchange with the top card of the deck, unless the top card is a king in which case no exchange occurs. In the case of the dealer and receiver having same ranked cards the dealer is the winner.

Le Her played a role in the development of the mathematical theory of probability with solutions being sought by Bernoulli and de Montmort

Pierre Raymond de Montmort

Pierre Rémond de Montmort, a French mathematician, was born in Paris on 27 October 1678, and died there on 7 October 1719. His name was originally just Pierre Rémond or Raymond...

.