The house advantage
On a single zero roulette table the house advantage is 2.7%. On a double zero roulette table it is 5.26% (7.9% on the five-number bet, 0-00-1-2-3). The house advantage is gained by paying the winners a chip or two (or a proportion of it) less than what it should have been if there was no advantage. (See Roulette Quiz - The Casino Advantage.)

The `En Prison` rule
A roulette rule applied to even-money bets only, and by some casinos (not all). When the outcome is zero, some casinos will allow the player to either take back half his/her bet or leave the bet (en prison = in prison) for another roulette spin. In the second case, if the following spin the outcome is again zero, then the whole bet is lost.

The `La Partage` rule
The la partage roulette rule is similar to the en prison rule, only in this case the player loses half the bet and does not have the option of leaving the bet en prison for another spin. This refers to the `outside` even-money bets Red/Black, High/Low, Odd/Even and applies when the outcome is zero. Both the La Partage and the En Prison roulette rules essentially cut the casino edge on the `even-money bets` in half. So a bet on Red on a single-zero roulette table with the la partage rule or the en prison rule has a 1.35% house edge and one on a double-zero roulette table has a house edge of 2.63%.

The payouts

1. A bet on one number only, called a straight-up bet, pays 35 to 1. (You collect 36. With no house advantage you should collect 37 (38 in the USA on double zero roulette wheels).
2. A two-number bet, called split bet, pays 17 to 1.
3. A three-number bet, called street bet, pays 11 to 1.
4. A four-number bet, called corner bet, pays 8 to 1.
5. A six-number bet, pays 5 to 1.
6. A bet on the outside dozen or column, pays 2 to 1.
7. A bet on the outside even money bets, pays 1 to 1.

The object of the game is still the same - to predict which number out of possible 37 the ball will land on. And of course, they speak French. Below are the English and equivalent French terms for the various roulette bets:

Inside bets

Straight Up	A bet on any single number including "0", placed directly on the number
Split Bet	A bet on two adjacent numbers, placed on the line between the 2 numbers. Also can be made between 0 and 1, 0 and 2, or 0 and 3.
Street Bet	A bet on all three numbers in a row, placed on the line at the end of the row. Can also be placed on 0, 1, and 2. Or 0, 2 and 3.
Corner Bet	A bet on a group of four numbers, placed at the corner where the 4 numbers touch. Also can be made on the corner of 0, 1, 2, and 3.
Line Bet	A bet on six numbers (2 rows of 3 numbers), placed at the end of two rows on the line between them.

 Outside bets

Column Bet	A bet on an entire column, placed on a 2-1 box at the end of a column.
Dozen Bet	A bet on a group of 12 numbers, placed on the 1st 12 box (numbers 1-12), 2nd 12 box (numbers 13-24), or 3rd 12 box (numbers 25-36).
Colour Bet	A bet on all three numbers in a row, placed on the line at the end of the row. Can also be placed on 0, 1, and 2. Or 0, 2 and 3.
Even/Odd	A bet on all of the red numbers or all of the black numbers, placed on the red box (all red numbers) or the black box (all black numbers).
Low/High Number	A bet on all low numbers or all high numbers, placed on the low box (numbers 1-18) or the high box (numbers 19-36).

If 0 is spun, all outside bets are halved and returned to the player.

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