The history of poker is a matter of debate. It closely resembles the Persian game of as nas, and may have been taught to settlers in New Orleans by Persian sailors. The name of the game likely descended from the Irish Poca (Pron. Pokah) ('Pocket') or even the French poque , which descended from the German pochen ('to brag as a bluff' lit. 'to knock' [1] ). Yet it is not clear whether the origins of poker itself lie with the games bearing those names. It is commonly regarded as sharing ancestry with the Renaissance game of primero and the French brelan. The English game brag (earlier bragg) clearly descended from brelan and incorporated bluffing (though the concept was known in other games by that time). It is quite possible that all of these earlier games influenced the development of poker as it exists now. English actor Joseph Crowell reported that the game was played in New Orleans in 1829, with a deck of 20 cards and four players betting on which player's hand was the most valuable. Jonathan H. Green's book, An Exposure of the Arts and Miseries of Gambling (G. B. Zieber, Philadelphia, 1843), described the spread of the game from there to the rest of the country by Mississippi riverboats, on which gambling was a common pastime. As it spread up the Mississippi and West during the gold rush, it is thought to have become a part of the frontier pioneer ethos. Soon after this spread, the full 52-card English deck was used, and the flush was introduced. During the American Civil War, many additions were made, including draw poker, stud poker (the five-card variant), and the straight. Further American developments followed, such as the wild card (around 1875), lowball and split-pot poker (around 1900), and community card poker games (around 1925). The spread of the game to other countries, particularly in Asia, is often attributed to the U.S. military. The game and jargon of poker have become important parts of American culture and English culture. Such phrases and clichés as ace in the hole, ace up one's sleeve, beats me, blue chip, call one's bluff, cash in, high roller, pass the buck, poker face, stack up, up the ante, when the chips are down, wild card, and others are used in everyday conversation, even by those unaware of their origins at the poker table. Modern tournament play became popular in American casinos after the World Series of Poker began, in 1970. Notable champions from these early WSOP tournaments include Johnny Moss, Amarillo Slim, Bobby Baldwin, and Doyle Brunson. It was also during that decade that the first serious strategy books appeared, notably Super/System by Doyle Brunson and The Book of Tells by Mike Caro , followed later by The Theory of Poker by David Sklansky