Roulette La Partage and En Prison Rules and Implications
By SharpGambler on Tue, 15 May 2007 10:31:08 (745 Reads)
European Roulette is the best roulette game for a player as we discussed in the article Roulette - American or French?. The simple fact that only a single zero exists on French or European tables gives a great advantage to the player over the American Roulette. Usually, European casinos also apply La Partage and En Prison rules, reducing their edge, and giving more chances of winning to the player. When one of these rules is in place (or both) the house edge is of only 1.35% comparing to 5.26% on American Roulette, and 2.70% on an European Roulette without these rules.
La Partage Rule
First of all let me say that La Partage is a French expression meaning "sharing". In fact, La Partage determines exactly that your bet is shared with the house in certain cases. The rule applies to even money bets like Red/Black, Odd/Even, High/Low. When you make an even money bet there is a possibility of the outcome of the game being the single zero which is not red or black, odd or even, nor high or low. It means that you have lost your bet. La Partage rule applies in these cases and when the single zero arrives you won't loose your stake, but only half. Your stake is shared between you and the house. This single fact reduces the house edge from 2.70% to 1.35%.En Prison Rule
"En Prison" is another French expression. It means "in prison". En Prison rule applies also on even money bets. when the single zero arrives on the roulette wheel, you don't loose your stake. Instead, your stake is imprisoned. Your stake will stay on the table until a number different from the single zero arrives on the wheel. This rule, is a little different from La Partage but has the same final effect: the house edge is reduced to exactly 1.35% on both cases.Let's look at an example. You are betting on "Red". Let's look at the odds and probabilities:
French Roulette With Single Zero And No Extra Rules |
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| Outcome | Probability | Payout |
| Red | 0.4865 | 0.9730 |
| Black | 0.4865 | 0.0000 |
| Single Zero | 0.0270 | 0.0000 |
| Expected Payout | 0.9730 | |
| House Edge | 0.0270 | |
French Roulette With Single Zero And La Partage / En Prison Rules |
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| Outcome | Probability | Payout |
| Red | 0.4865 | 0.9730 |
| Black | 0.4865 | 0.0000 |
| Single Zero | 0.0270 | 0.0135 |
| Expected Payout | 0.9865 | |
| House Edge | 0.0135 | |
Some casinos may have in place La Partage and En Prison rules at the same time. It means that you can choose between loosing half the stake or keep the stake imprisoned after the single zero arrives. In this case both decisions have the same implications, so it does not matter what you do. In terms of house edge, a roulette with both rules gives the same house edge as a roulette with only one - 1.35%.
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