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En prison is a rule that applies only to even-money bets, which are bets that pay 1 to 1, such as odd or even, red or black, or low or high. En prison is a French term that means “in prison”, and it refers to the situation when the ball lands on zero, which is neither odd nor even, red nor black, low nor high. In this case, instead of losing the entire bet, the bet is placed “in prison” for the next spin. The bet remains on the same spot, and the outcome of the next spin determines its fate. If the bet wins on the next spin, the player gets back the original bet without any additional winnings. If the bet loses on the next spin, the player loses the entire bet. If the ball lands on zero again, the bet may remain in prison, or it may be lost, depending on the casino’s rules.
The purpose of en prison is to reduce the house edge, which is the mathematical advantage that the casino has over the players, and which ensures that the casino will always make a profit in the long run. The house edge varies depending on the game, the rules, and the strategy of the players, but it is always present and unavoidable. The house edge in roulette is mainly determined by the presence of the zero or the double zero, which gives the casino an extra advantage over the players. By using en prison, the players can lower the house edge from 2.7% to 1.35% in European roulette, or from 5.26% to 2.63% in American roulette. This means that the players can expect to lose less money in the long run and have a better chance of winning or breaking even.
The availability and the frequency of en prison vary depending on the game, the rules, and the casino. En prison is a rule that is mostly found in European or French roulette, which have a single zero on the wheel. En prison is very rare or nonexistent in American roulette, which has a double zero on the wheel. En prison is also a rule that is more common in land-based casinos, especially in Europe, than in online casinos, where it may be replaced by another rule called la partage, which is similar but less favorable for the players. En prison is also a rule that is optional, meaning that the players can choose whether to use it or not, depending on their preference and strategy.
En prison is a term that has a lot of significance in casino gambling, especially in roulette. It is the name given to the roulette rule where even-money bets are held over if the ball lands on zero, giving the players a second chance to win or lose their bets. It is a rule that can reduce the house edge and increase the odds of the players, but also requires a lot of luck and patience. Roulette is a fun and exciting game, as long as the players know the rules and the odds of the game.