En Prison
The “En Prison” rule is a unique option available in European roulette that offers players a second chance to recover their bet. This rule comes into play when a player places an even-money bet (like red/black or odd/even) and the ball lands on zero, which would typically result in a loss. Instead of losing their wager outright, the En Prison rule allows the bet to be “imprisoned,” meaning it stays on the table for the next spin. If the player’s bet wins on the following spin, the original wager is returned without any winnings. However, if the bet loses again, the entire amount is forfeited. This rule slightly improves the player’s odds and adds an extra layer of strategy to the game, making it a favorite among those who enjoy European roulette.