Single Zero Roulette: Why European Rules Change the Game

Roulette strategy begins before placing a single chip: with which version of the game you choose to play. The wheel configuration — specifically, how many zero pockets it contains — determines the house edge more than any betting system or number selection.

American vs European Roulette

American roulette has 38 pockets: numbers 1–36, plus 0 and 00. The house edge on all bets (except the Five-Number bet) is 5.26%. European roulette has 37 pockets: 1–36 plus a single 0. House edge: 2.70%. The difference arises because winning number bets pay 35:1 in both cases, but the probability of winning is 1/38 versus 1/37 respectively.

For every $100 wagered, American roulette costs $5.26 in expected losses; European roulette costs $2.70. Over a typical session, this difference compounds meaningfully.

La Partage and En Prison Rules

French roulette adds rules that further reduce the house edge on even-money bets (red/black, odd/even, high/low). La Partage returns half the stake when the ball lands on zero — reducing the house edge on even-money bets to 1.35%. En Prison instead imprisons the bet for one more spin; if the next spin also hits zero, the bet is lost.

With La Partage on even-money bets, French roulette approaches blackjack in terms of house edge quality.

Practical Strategy

1. Always play single-zero over double-zero when available. Never play American roulette when European is accessible. 2. Seek French roulette (La Partage) for even-money bets — the optimal roulette bet. 3. No betting system changes the fundamental edge. The Martingale on American roulette still has a 5.26% edge; the Martingale on French roulette has 1.35% on even-money. The system is irrelevant; the wheel matters. 4. Avoid novelty bets (Five-Number on American: 7.89%), neighbour bets with wide margins, and electronic roulette with an unknown or unfavourable RTP.