La Partage Rule

La Partage is a roulette settlement rule: when the ball lands on single zero, the house takes half of a qualifying even-money wager and returns the other half. It normally applies to red/black, odd/even, and 1–18/19–36. The bet is finished immediately; it is not held for another spin.

The rule does not change where the ball can land. It changes only how much is lost on zero. That distinction is why La Partage is a real improvement in game price but not a roulette strategy.

The settlement in one example

You wager $40 on black.

On zero, the dealer or electronic game divides the stake into two equal parts. One half is collected; the other is returned. No additional spin is needed.

This immediate half-loss is the defining feature. If the whole bet remains on the layout awaiting a later spin, that is an En Prison rule or another continuing-bet procedure, not ordinary La Partage.

Which wagers normally qualify

The six standard even-money propositions are:

• red;
• black;
• odd;
• even;
• low, meaning 1–18;
• high, meaning 19–36.

These bets pay 1 to 1 and divide the 36 numbered pockets into two groups of 18. Zero belongs to none of those groups, so it is the exceptional result that triggers the rule.

The following wagers normally do not receive La Partage protection:

“Outside bet” is not precise enough. Dozens and columns sit outside the number grid, but they are 2-to-1 bets and usually do not qualify. The correct category is even-money bet.

What to verify before placing a wager

A single-zero wheel does not automatically guarantee La Partage. A table described as European or French may use different procedures. Before playing, confirm all of the following:

1. The wheel: Is there one zero, two zeroes, or three zero symbols?
2. The qualifying wagers: Does the rule cover all six even-money bets?
3. The trigger: Does only 0 trigger the half return, or does the game describe another zero treatment?
4. The timing: Is half returned immediately, or is the wager held?
5. The denomination rule: Can the stake be divided exactly in the available chips or account units?
6. The posted exception: Are certain limits, tables, modes, or side bets excluded?

Official roulette frameworks can authorize different zero-settlement options. For example, the Massachusetts roulette rules allow a notified half-loss treatment on qualifying even-money wagers in a double-zero game. That procedure resembles La Partage, but a 38-pocket wheel produces different mathematics from classic single-zero La Partage. Read the actual rule instead of relying on the marketing label.

Why the edge becomes 1.35135%

A single-zero wheel has 37 pockets:

• 18 win an even-money wager;
• 18 produce a full loss;
• zero produces a half loss.

For one unit wagered:

$$EV=\frac{18}{37}(+1)+\frac{18}{37}(-1)+\frac{1}{37}(-0.5)$$

The 18 full wins and 18 full losses cancel, leaving:

$$EV=-\frac{0.5}{37}=-\frac{1}{74}\approx-1.35135%$$

That is the exact house edge on a qualifying single-zero even-money bet under the standard half-loss rule. Standard single-zero roulette takes the full stake on zero and has an edge of $1/37$, or about 2.7027%, on the same wagers.

The full derivation, expected-loss comparisons, and double-zero half-loss case belong in House Edge With La Partage. For table use, remember the simpler statement: zero costs half instead of all.

Odd chip amounts and fractional settlement

A $20 wager divides into $10 and $10. A $25 wager divides into $12.50 and $12.50. The second case requires a chip, token, credit unit, or approved accounting method capable of representing fifty cents.

Casinos may manage this by:

• requiring wagers in divisible units;
• using fractional-value chips;
• setting a minimum denomination that halves cleanly;
• applying an approved rounding procedure;
• restricting the rule to particular tables or electronic formats.

Do not assume a half unit will be rounded upward. If the table minimum creates an awkward split, ask how zero is settled before betting. On an online game, the help screen or paytable should state the credited amount precisely.

Multiple even-money wagers on the same spin

Each qualifying wager is divided separately when zero lands.

Suppose a player has:

• $20 on red;
• $10 on odd;
• $10 on low.

The total action is $40. If zero lands, each wager loses half:

The rule does not combine the bets into one protected position. Every chip stack remains a separate contract.

The same principle defeats the idea of “covering both sides.” If a player bets $20 on red and $20 on black, every non-zero result creates one $20 win and one $20 loss, for no net profit. Zero causes a $10 loss on each side, for a $20 net loss. Total action doubles without creating an advantage.

Dealer procedure on zero

Exact sequence varies by house, but a clean live-table settlement should make the following visible:

1. The dealer identifies and marks the winning zero.
2. Ordinary losing wagers are collected according to procedure.
3. Qualifying even-money stacks are separated from full-loss wagers.
4. Half of each qualifying stake is collected.
5. The remaining half is returned or left for the player as the rules specify.
6. Winning zero and other authorized wagers are paid.
7. The layout is cleared before the next betting period.

The order matters because zero creates several different classes of chips at once: straight-up zero winners, ordinary losers, and protected even-money half losses. A rushed sweep can produce disputes if the protected stacks are not visibly separated.

Players should leave the chips untouched until settlement is complete. Reaching into a stack while the dealer is dividing it makes an otherwise simple procedure harder to audit.

La Partage versus En Prison

Both rules protect qualifying even-money wagers after zero, but the player experience is different.

Under common versions, both can produce about a 1.35% effective edge on single-zero even-money bets. En Prison variants can differ when zero repeats or when the release condition changes. The similar headline edge does not make the procedures interchangeable.

What La Partage does not do

It does not:

• raise the probability of red, black, odd, even, high, or low;
• make a colour “due” after a streak;
• improve inside-bet payouts;
• protect dozens or columns unless expressly stated;
• remove table limits;
• make Martingale or another progression positive expectation;
• reduce the variance of ordinary full wins and full losses on non-zero spins.

It does reduce expected loss on qualifying action. If two otherwise comparable single-zero tables have similar limits and pace, the one with La Partage is the better-priced choice for even-money play.

Session-cost example

A player makes 100 wagers of $25 on black.

$$\text{Total action}=100\times$25=$2{,}500$$

At the La Partage edge:

$$\text{Expected loss}=$2{,}500\times0.0135135\approx$33.78$$

At standard single-zero settlement:

$$\text{Expected loss}=$2{,}500\times0.027027\approx$67.57$$

The rule saves about $33.79 in theoretical cost over that action. It does not predict the session result. One hundred spins can still end with a large win or loss because each spin settles as a full win, full loss, or half loss.

Pace also matters. A better edge at a very fast electronic game can cost more per hour than a slower standard game if the player places far more wagers. Use the expected-loss calculator with actual stake and spin count rather than comparing edge alone.

The practical decision

Choose La Partage for the rule advantage, not for a story about beating roulette. Confirm the wheel, qualifying bets, chip treatment, and settlement procedure. Then keep stake size based on the amount you are prepared to lose, not on the reduced headline edge.

For the wider format, see French roulette rules. For probabilities across the wheel, use roulette odds. For the alternative delayed settlement, read En Prison.

La Partage as a term and as a settlement instruction

La Partage literally describes the half-loss treatment applied to eligible even-money wagers when zero lands under the relevant rules. The useful casino question is not merely what the phrase means, but which wagers qualify, whether the rule applies on this wheel, and how a half unit is settled when chip denominations do not divide cleanly.

That terminology now lives with the dedicated rule procedure. The separate house-edge page remains the place for deriving the 1.35135% expected loss and comparing it with ordinary single-zero roulette.

Rule procedure first; expected-value derivation second

A player should be able to answer three procedural questions before worrying about the percentage: which outside bets qualify, what exactly happens when zero lands, and how is a half unit handled? Those are rule questions and they belong here.

The companion House Edge With La Partage page derives the 1.35135% benchmark and compares session cost across wheel/rule variants.