La Partage reduces the house edge on qualifying even-money roulette bets to about 1.35%. When zero lands, the player loses only half the stake instead of the full stake. That half-loss rule cuts the single-zero even-money edge from 2.70% to 1.35%.
Quick Facts
- La Partage means “sharing” or “splitting” the zero result.
- It usually applies only to even-money bets.
- Qualifying bets are normally red/black, odd/even, and high/low.
- Standard single-zero even-money edge: 2.70%.
- La Partage effective edge: 1/74 = 1.35135%, rounded to 1.35%.
- Inside bets, dozens, columns, and call bets usually do not receive the rule.
- It lowers cost but does not create a player advantage.
Plain Talk
La Partage is one of the fairest common roulette rules a player can find.
On a normal single-zero roulette table, a red bet loses when zero appears. With La Partage, zero does not take the full bet. The dealer takes only half and returns the other half.
That small change matters because zero is the entire source of the standard single-zero edge on even-money bets.
Without La Partage, a $20 red bet loses $20 on zero.
With La Partage, that same $20 red bet loses $10 on zero.
The player still loses in the long run. But the price of playing that specific bet is cut in half. The Wizard of Odds roulette basics is a useful reference for standard roulette probabilities and house edge, and rule documents such as the Massachusetts roulette rules show how official game rules define eligible bets and settlement.
This page is about the house edge effect. For the player-facing rule itself, read La Partage rule.
How It Works
A single-zero wheel has 37 pockets.
For red/black:
| Outcome | Count | Normal result | La Partage result |
|---|---|---|---|
| Red | 18 | Win 1 unit | Win 1 unit |
| Black | 18 | Lose 1 unit | Lose 1 unit |
| Zero | 1 | Lose 1 unit | Lose half unit |
La Partage changes only the zero result.
That is enough to change the edge.
| Bet | Normal single-zero edge | Edge with La Partage |
|---|---|---|
| Red/black | 2.70% | 1.35% |
| Odd/even | 2.70% | 1.35% |
| High/low | 2.70% | 1.35% |
| Straight-up | 2.70% | Usually no change |
| Dozen | 2.70% | Usually no change |
| Column | 2.70% | Usually no change |
The rule does not make red “more likely.” It changes the cost of the losing zero outcome.
Roulette Table Example
You bet $50 on black at a single-zero table with La Partage.
The ball lands on zero.
| Rule | Player result |
|---|---|
| Normal single-zero roulette | Lose $50 |
| La Partage | Lose $25 and receive $25 back |
Now stretch that over $5,000 of even-money action:
| Rule | Total action | Effective edge | Expected loss |
|---|---|---|---|
| Normal single-zero | $5,000 | 2.70% | $135.14 |
| La Partage | $5,000 | 1.35% | $67.57 |
A player can still have a bad session. La Partage does not protect against variance. It only improves the average price.
From the Casino Side:
La Partage requires clean dealer procedure.
When zero lands, the dealer must identify which bets qualify, take the correct half, return the correct half, and avoid paying or saving bets that do not receive the rule. This is easy on a simple red/black layout and more sensitive on a busy table with multiple players and color chips.
Floor supervisors care about consistency. If one dealer applies La Partage too broadly, the table gives away money. If another dealer fails to apply it to a qualifying bet, the casino creates disputes and damages trust.
Surveillance watches zero settlements closely because they are procedural exceptions. Normal losing bets are easy. Half-loss bets require attention.
Common Mistakes
- Thinking La Partage applies to every bet on the layout.
- Forgetting that dozens and columns are not even-money bets.
- Assuming every French or European roulette table offers the rule.
- Calling La Partage a winning strategy.
- Ignoring total action because the edge looks low.
- Playing faster because the rule feels safer.
- Confusing La Partage with En Prison.
Hard Truth
La Partage is not a way to beat roulette. It is a way to pay less rent to the zero.
FAQ
What house edge does La Partage create?
On qualifying even-money bets, La Partage creates an effective edge of about 1.35%.
Why is the edge cut in half?
Because zero is the only extra losing result on a single-zero even-money bet. La Partage cuts the zero loss in half, so it cuts the edge in half.
Does La Partage apply to straight-up numbers?
Usually no. A straight-up bet on a single number normally loses in full when zero lands, unless the bet was on zero itself.
Does La Partage apply to dozens and columns?
Usually no. Dozens and columns pay 2 to 1 and are not even-money bets.
Is La Partage better than En Prison?
It is simpler. The effective edge can be similar, but La Partage settles immediately. En Prison delays settlement and depends more on house rules.
Can I use Martingale with La Partage?
You can, but the progression still does not beat the game. It only combines a lower edge with higher bankroll and table-limit risk.
Should I choose La Partage if available?
For even-money roulette play, yes. It is one of the best common roulette rules for reducing long-run cost.
Deeper Insight
La Partage is powerful because it attacks the exact source of the even-money edge.
On a single-zero wheel, red and black are balanced at 18 numbers each. If there were no zero, red/black would be a fair 50/50 bet at even money. The zero breaks that fairness.
Most roulette changes are cosmetic to the math. A racetrack layout changes how bets are placed. A call bet changes which wheel section is covered. A hot-number screen changes what players notice. None of those automatically change expected value.
La Partage does.
It does not change probability. It changes the loss size on the key losing event. That is why it matters more than most “strategy” talk at the table.
The Nevada roulette rules of play are a useful reminder that roulette is settled by defined rule, not by table folklore. If a table offers a zero-relief rule, the exact wording matters.
Formula / Calculation
Standard even-money EV on a single-zero wheel:
$$EV = \left(\frac{18}{37} \times 1\right) - \left(\frac{19}{37} \times 1\right) = -\frac{1}{37}$$
With La Partage:
$$EV = \left(\frac{18}{37} \times 1\right) - \left(\frac{18}{37} \times 1\right) - \left(\frac{1}{37} \times 0.5\right)$$
$$EV = -\frac{0.5}{37} = -\frac{1}{74}$$
$$House\ Edge = 1.35135% \approx 1.35%$$
Formula Explanation in Plain English
A normal red bet wins 18 ways and loses 19 ways because zero is an extra loser. La Partage changes zero from a full loss into a half loss. The 18 normal losses still lose, but the one zero loss is softened. That makes the average cost half as large.
Related Reading
Use the full roulette guide for the course overview. Compare the base numbers on roulette odds and roulette house edge. For the broader French version, read French roulette rules and French roulette house edge. To check real session cost, use the expected loss calculator or house edge calculator. For system myths, read why roulette systems fail.