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 their 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 their 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.
The 'La Partage' version of Roulette is more favorable towards the player when compared to the standard American and European Roulette Games. It has a payout percentage of 98.5%
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.
- "Roulette". Wizard Of Odds Consulting. Retrieved 2009-09-28.
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