There are two types of Roulette tables. The American Roulette table has 38 numbers including 0 and 00. The French or European table has 37 numbers (it doesn’t have the 00). European and Atlantic City Casinos also feature the “En Prison” rule which is favorable to the player. Most European Casinos use the true En Prison rule. Atlantic City 00 wheels use a variation of the En Prison rule called Surrender.
EN PRISON: 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.