Only a few players know that zero (in French roulette) and double zero (in American roulette) have a house (dealer) advantage. In other words, when the outcome is zero, the player loses half the bet (this does not refer to bets on zero).
There are several ways of betting zero: single-number (en plein), split bet (two numbers), row bet (three numbers including zero), corner bet (four numbers) and six numbers. French roulette only applies the ‘en prison’ rule when the ball lands on zero giving the player the option of leaving the bet en prison (= in prison) for another spin. In American roulette there are no rules to the player’s advantage. All the more, 00 pocket increases the house edge by 50%. House advantage is proportional to the number of bets and can turn into extortionate ratio after 3,000 bets; you’d better place your bets in the short run and base your strategy on relatively few wagers. It should be said that probabilistic systems are not to be used in the long run as roulette is one of the few games wherein a player has the chance of beating the croupier thanks to unfavourable mathematics events such as zero and double zero.

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