In roulette, the en prison rule is an opportunity to recover one's stakes after a spin of zero, provided one's bet was even-odds (i.e. high–low, even–odd, red–black). It is a variant of the la partage rule, in which a player loses only half his even-odds stake if the original spin is a zero, recouping the other half (partage being French for "sharing"). In European casinos, where la partage is customary, the player may be given the option instead to place his original stake en prison ("in prison" in French). The stake is left on the previous bet, and the croupier places a marker on it to show it is en prison. If the bet wins on the next spin, the player's stake is returned; if it loses, it is forfeited. Different casinos adopt different rules for the case where zero comes up a second time: it may be treated as won, lost, la partage or en prison.
Most Casinos in the United States do not use la partage or en prison rules; an even-odds stake loses if zero is rolled. Those that do include these Las Vegas Casinos: The Bellagio, MGM Grand, The Mirage, The Rio and The Wynn.
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