French Roulette: La Partage and En Prison Explained
French roulette is the version of the game that mathematicians quietly prefer, and almost nobody outside France can tell you why. The wheel is the familiar European single zero, the payouts are standard, and the layout is covered in French words. The secret is two small rules — la partage and en prison — that activate only when the ball lands on zero, and only for certain bets.
Those two rules cut the house edge on even-money bets in half, from 2.7 percent to 1.35 percent. That makes French roulette, bet for bet, one of the fairest games in the entire casino. Here is how it works.
The French table at a glance
The wheel itself is the European one: 37 pockets, numbers 1 to 36 plus a single zero. What looks foreign is the betting cloth. The even-money bets wear their original French names — rouge and noir for red and black, pair and impair for even and odd, manque and passe for low and high numbers. Dozens appear as P12, M12 and D12, and the layout often shows a racetrack section for announced bets like voisins du zéro.
None of this changes the odds. It is the same game wearing its Sunday clothes. The meaningful difference lives entirely in what happens when the ball lands on zero.
The racetrack section deserves a word of its own. Announced bets like voisins du zéro — «neighbors of zero» — cover seventeen numbers clustered around the zero pocket with nine chips placed as a fixed pattern. They change which numbers you cover, never the house edge, but they are a large part of the French table's character and vocabulary.
La partage: half back on zero
In most roulette games, zero is a massacre: every outside bet loses in full. Under la partage — French for «the sharing» — an even-money bet caught by zero is split instead. You lose half your stake and the other half is returned to you immediately. A ten-dollar bet on red that meets the zero pocket costs five dollars, not ten.
The arithmetic is elegant. Zero is the only pocket where the house makes its money on even-money bets, and it lands one spin in 37 on average. Keeping only half of those stakes instead of all of them drops the house edge on those bets to 1.35 percent — a return of 98.65 percent, better than almost anything else on the casino floor.
En prison: the bet stays for one more spin
En prison solves the same problem the other way. When zero hits, your even-money bet is not lost or split; it is marked and left in place — «in prison» — for the next spin. If your bet wins on that spin, you get the full stake back with no profit. If it loses, it is gone. If zero lands again, rules vary by table: some prisons hold for another spin, some finally take the stake.
The expected value works out nearly identical to la partage — about 1.35 percent house edge on even-money bets — delivered through suspense instead of arithmetic. Which version a table offers is simply a house tradition, and from the player's side the two are interchangeable.
The three flavors of zero, compared
| Rule on zero | What happens to an even-money bet | House edge on even-money bets |
|---|---|---|
| None (standard European) | Lost in full | 2.70% |
| La partage | Half returned immediately | 1.35% |
| En prison | Held for one more spin | About 1.35% |
| American wheel, no rule | Lost in full on zero or double zero | 5.26% |
Where the edge actually changes
The fine print matters: la partage and en prison apply only to even-money outside bets. Bets on single numbers, splits, streets and dozens keep the standard European edge of 2.7 percent, because those bets were never rescued by the zero rules. A French table therefore rewards a specific style of play — red or black, odd or even — and offers no discount for the rest of the layout.
The difference shows up over time, not in single spins. Bet ten dollars on red for a hundred spins, and the long-run expected cost is about 27 dollars on a standard European wheel against roughly 13.50 with la partage. Same game, same thrill, half the toll.
Finding the rule in the wild
True French roulette is rarer than the European game, but it exists both online and in traditional European casinos, sometimes under names like French Roulette Gold or simply as a rule note on the table card. Before sitting down, it pays to check:
- Whether the wheel has one zero or two.
- Whether la partage or en prison is stated in the table rules.
- Whether the rule applies to all even-money bets or only some.
- The table minimum, which on French tables is often higher than average.
Play responsibly
A fairer game is still a game with a house edge, and French roulette remains entertainment for adults aged 18 and over, not an investment. The 1.35 percent edge means losses arrive slowly, which makes firm limits on time and money even more important, because gentle games encourage long sessions. Set both limits before the first spin and honor them. If gambling ever stops feeling optional, confidential help from problem-gambling helplines and support services is available, and asking for it is a decision you will not regret.
