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La Partage

On most single-zero tables a bet on red loses its full stake when the ball lands in zero. Under the La Partage rule the player gets half of that stake back. The rule is typical of French-style tables and is the main reason "French roulette" is associated with a lower cost of play.


What it covers, and what it changes:


Eligible wagers are the even-money bets: red or black, odd or even, low (1–18) or high (19–36).
Inside bets are unaffected; a straight-up number still loses in full on zero.
Zero turns from a one-unit loss into a half-unit loss on the eligible stake. Of 37 pockets, 18 win one unit, 18 lose one unit and the zero pocket costs half a unit.
Expected loss per unit falls to 1/74, about 1.35%, against 2.70% without the rule. The connection between [https://casinohouseedge.com/roulette-house-edge/ La Partage and roulette payouts] comes down to that one changed settlement on one pocket.


In money: a player betting $10 on black for 370 spins meets zero ten times on average. Without the rule those spins cost $100; with it, $50.


Two cautions. The 1.35% belongs to the even-money bets only; a table sold as French roulette still charges 2.70% on a single number. And a lone zero on the wheel is not proof that La Partage applies. Some single-zero tables settle zero as a full loss, and some online versions use the rule only above a minimum stake, so the settlement has to be read from the table rules.


En Prison is the related rule: the even-money stake is held over to the next spin instead of being halved. Its value depends on what happens if zero repeats, which varies between venues, so the two rules are priced differently.