Applied to even-money bets. If the ball lands on zero, the bet is imprisoned for another spin. If the ball lands on zero during the next spin, the player loses the bet. This rule reduces the house edge by 50% on even-money bets.
The en prison rule (or surrender rule) is offered in some European roulette games. If you have made an outside evens-money bet (such as red/black) and the ball lands on 0, you may choose to lose half of your stake or keep your bet en prison (that is, leave it in place for the next spin). By leaving it “en prison”, you lower the house edge for your next spin.
When the outcome is zero, some casinos will allow the players to either take back half his bet or leave the bet (in prison) for another spin. In the second case, if the following spin the outcome is again zero, then the whole bet is lost. This rule applies to even money bets only.
When a 0 or 00 comes up, the player has the option of giving up half his bet or imprisoning the bet for one more spin. If the player's choice comes up then, the bet is not lost.
This is also known as the surrender rule. Mostly applicable in European roulette; in an en prison rule, when the player makes an outside bet (even money, or red/black), and then the ball drops on 0, the player has the option to lose half the bet or retain the money at stake en prison, meaning leaving it on the table for the next spin. When a player opts to leave it, the chance or the edge of the house is considerably lowered in the next spin.
this rule requires that a player in a game of Roulette be given the choice of either, surrendering half of the bet, or allowing the bet to be imprisoned for another spin, in which case, the entire wager will be returned if won.
(French) - This rule is applied to even money bets only. When the outcome is zero, players have option to surrender half the bet or to allow the bet to be imprisoned for another spin, in which case, the entire wager will be returned if won.
A rule whereby the player has the option of either surrendering half his wager or allowing it to be imprisoned for another spin of the wheel, in which case, if he wins, the wager will be intact. This rule applies when a zero comes up and the bettor has wagered on the outside even-money choices.
When En Prison is employed on European Roulette tables, an even money bet (Red, Black, Odd, Even, 1-18, 19-36) that results in a spin of 0 becomes imprisoned. If this imprisoned bet wins on the next spin, the original bet is released and returned to the player.
