World Series of Poker
The idea of a World Series of Poker began in 1969 with an event called the Texas Gambling Reunion. It was an invitational event sponsored by Tom Moore of San Antonio, Texas, and held at the Holiday Hotel and Casino in Reno. This inaugural event was won by Crandell Addington. The set of tournaments that the World Series of Poker (WSOP) would evolve into was the brainchild of Las Vegas casino owner and poker player Benny Binion. In 1970, the first WSOP at Binion's Horseshoe took place as a series of cash games that included five-card stud, deuce to seven low-ball draw, razz, seven-card stud, and Texas hold 'em. The format for the Main Event as a freeze-out Texas hold 'em game came the next year. The winner in 1970, Johnny Moss, was elected by his peers as the first "World Champion of Poker" and received a silver cup as a prize.
Poker
In the 1937 edition of Foster's Complete Hoyle, R. F. Foster wrote: "the game of poker, as first played in the United States, five cards to each player from a twenty-card pack, is undoubtedly the Persian game of As-Nas." By the 1990s some gaming historians including David Parlett started to challenge the notion that poker is a direct derivative of As-Nas. Developments in the 1970s led to poker becoming far more popular than it was before. Modern tournament play became popular in American casinos after the World Series of Poker began, in 1970.