What Is en Prison in Roulette?

En prison is a rule in some types of roulette that allows players to recoup losses on even-money bets when the ball lands on 0. The rule is also known as la partage, and it is similar to the house edge in blackjack.

When the en prison rule is in effect, players who have bet on even-money propositions such as red or black, odd or even, or 1-18 or 19-36 will have half of their bet returned to them if the ball lands on 0. If the ball lands on a number that corresponds to their bet, they will lose their entire bet.

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PRO TIP:When playing Roulette, en Prison is an option that can be taken when betting on even money bets (i.e. red/black, odd/even, 1-18/19-36). If the ball lands on the 0 or 00 pocket, this bet will be “imprisoned” and will remain in play for the next spin. If you win on the next spin, your bet will be returned; if you lose, your bet is forfeited to the house.

The en prison rule reduces the house edge on even-money bets from 2.70% to 1.

35%. The la partage rule has the same effect, but it applies only when the ball lands on 0.

The en prison rule is not available in all casinos, and it may be subject to change without notice. Players should check with the casino before they play to find out if the en prison rule is in effect.