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Roulette is a casino and gambling game named after the French word meaning "small wheel". In the game a croupier spins a wheel in one direction, then spins a ball in the opposite direction around a tilted circular surface running around the circumference of the wheel. The ball eventually falls on to the wheel and into one of 37 (in European roulette) or 38 (in American roulette) colored and numbered pockets on the wheel.
Wheel layout
The main pockets are numbered from 1 to 36 alternating between red and black, but the pockets are not in numerical order around the wheel, and there are instances of consecutive numbers being the same color. There is a green pocket numbered 0, and in American roulette there is also a second green pocket marked 00.
Betting
Players can place a variety of 'inside' bets (selecting the number of the pocket the ball will land in, or range of pockets based on their position), and 'outside' bets (including bets on various positional groupings of pockets, pocket colors, or whether it is odd or even). The payout odds for each type of bet is based on its probability. There are usually posted rules for table minimum and maximum bets, and these rules usually apply separately for all of a players 'inside' and 'outside' bets for each spin. Players can continue to place bets until the dealer announces "No more bets." Players, usually up to eight, play against the house represented by the croupier also called the dealer, who spins the roulette wheel and handles the wagers and payouts. In the European roulette and French roulette version, the wheel has 37 slots representing 36 numbers and one zero. In the USA most roulette wheels have two zeros and therefore 38 slots.
Each player buys-in a different colored chips so their bets don't get mixed up. At the end of play, if you won, you exchange back the colored chips with cash chips. These are special chips with the value amount imprinted on them. There are several denominations in various colors. You then take these chips to the cash desk where they will give you actual cash money in exchange.
To play roulette, you place your bet or bets on numbers (any number including the zero) in the table layout or on the outside, and when everybody at the table had a chance to place their bets, the croupier starts the spin and launches the ball. Just a few moments before the ball is about to drop over the slots, the croupier says 'no more bets'. From that moment no one is allowed to place - or change - their bets until the ball drops on a slot. Only after the croupier places the dolly on the winning number on the roulette table and clears all the losing bets you can then start placing your new bets while the croupier pays the winners. The winners are those bets that are on or around the number that comes up. Also the bets on the outside of the layout win if the winning number is represented.
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.
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