California Split

California Split is a 1974 film directed by Robert Altman and starring Elliott Gould and George Segal as a pair of gamblers and was the first nonCinerama film to use eighttrack stereo sound.

As the film progresses and the two men hang out more, Bill starts to become more addicted to the gambling lifestyle. He goes into debt to his bookie Sparkie Joseph Walsh. Eventually, Bill hocks some of his possessions to fund a trip to Reno, where the duo pool their money to stake Bill in a poker game where one of the players is former world champion Amarillo Slim, portraying himself. Bill wins 18,000 and becomes convinced he is on a hot streak. He plays first blackjack, then roulette and finally craps, winning more and more money.But something happens at the craps table. When he finally stops, he is drained, almost apathetic. After they split their winnings 82,000, he tells Charlie he is quitting and going home. Charlie does not understand it, but sees that his friend means what he says, and they go their separate ways. ........

Source: Wikipedia