La partage and en prison settle the same zero differently

A half-refund and a held stake are different outcomes

An online roulette table can return half an even-money stake when zero lands, or a different rule can hold that stake for a later spin. Those are different settlement instructions. La partage divides the stake immediately.

En prison makes its eventual return depend on further results. Neither turns the original zero into a winning red or black result.

Evolution's public description of French Roulette specifies la partage on even-money bets. Casinos Barrière's French Roulette explanation describes imprisonment instead. The second source concerns its casino game, not a verified UK online offering.

Comparing the documents is useful precisely because the French label does not establish one universal zero procedure.

This study follows the money on a hypothetical £20 red wager. It separates returned stake, profit, lost stake and money still held. Amounts are illustrative; they are not a suggested stake.

The calculations assume a fair single-zero wheel with 37 equally likely pockets and ordinary even-money settlement away from zero. We inspected public rules, not a player account or a sequence of real wagers.

Sources: Live Roulette | Best Live Casino Games | Evolution Games; Roulette Française.

Identify which part of the layout receives the exception

The Massachusetts Gaming Commission's roulette rules provide a published reference for the familiar even-money groups: red or black, odd or even, and the two halves of the numbered range. Its single-zero baseline collects these bets when zero occurs.

The document is a Massachusetts rule set, used here to make the baseline explicit; it does not prescribe a UK online table's terms.

Barrière's English Roulette description lists the corresponding groups and says half the stake is lost on zero. Evolution also confines its French Roulette half-loss description to even-money bets. A dozen, column or individual number is not brought inside that protection merely because it appears beside a protected box.

Suppose a hypothetical layout contains £20 on red and £20 on a dozen. A la partage clause covering the red wager does not establish a £10 refund for the dozen. Each selection needs its own settlement rule.

Treating the total £40 on the screen as one protected wager would combine contracts that pay differently. The position of the chips is part of the calculation, not a cosmetic detail.

Sources: Roulette rules, 8 October 2020; English Roulette; Live Roulette | Best Live Casino Games | Evolution Games.

Follow £20 through three possible first results

For a winning £20 red bet at 1:1, net profit is £20 and total money returned is £40. On black, the stake is lost and nothing is returned. On zero with la partage, £10 is returned and £10 is lost.

The returned £10 is not a £10 win: the account began the round with £20 committed.

This original comparison applies the two published settlement descriptions to the same invented stake. It does not compare operators' measured returns. Only one row changes.

That is why a half-loss rule can alter the theoretical cost without changing the number of red pockets or making red more likely to land.

If an interface describes a credit as a return, compare it with the original debit before deciding whether the round made a profit. A positive credit can still finish a losing transaction.

Sources: Live Roulette | Best Live Casino Games | Evolution Games; Roulette rules, 8 October 2020.

Calculate the protected bet without rounding early

Under the stated model there are 18 red outcomes, 18 black outcomes and one zero. For the £20 la partage example, the weighted net change is (18 × £20 + 18 × −£20 + 1 × −£10) ÷ 37. The red and black terms cancel, leaving −£10/37, approximately −£0.27027 per initial £20 wager.

Divide that expected loss by £20 to obtain 1/74, approximately 1.35135%. With the full-loss zero rule, the corresponding expression is −£20/37, approximately −£0.54054, or 1/37 of the stake: 2.70270%. Keep the fractions until the final display so rounding does not create an apparent difference between two equivalent calculations.

These are averages under a mathematical model, not deductions charged after every spin. None of the three actual la partage outcomes in the table loses exactly 27 pence. Nor does a sequence of 37 spins have to contain one of every pocket.

Multiplying the expectation by a number of wagers describes the model's aggregate expectation; it does not give a schedule of results or a stopping point at which losses must equal it.

Sources: Live Roulette | Best Live Casino Games | Evolution Games; Roulette rules, 8 October 2020.

Imprisonment requires a second settlement entry

Barrière's French explanation describes an even-money stake being held after zero. A following result matching the original selection returns the stake; an opposing result loses it. Its separate repeated-zero wording says that two successive matching results are then needed to recover the stake.

That extra clause matters and should remain attached to this particular source.

Consider £20 on red, followed by zero and then red. The original £20 comes back under the described prison procedure. It is not an ordinary fresh winning £20 red bet paying £40.

The intervening spin resolves a held claim. By contrast, la partage already settled the original wager with a £10 loss at the first zero.

Now consider zero followed by black. The held £20 is lost in full. Those two paths show why half back immediately and the prospect of the original stake later are not interchangeable account entries.

We have not assigned a universal house-edge figure to en prison: repeated-zero and recovery conditions must be completely specified before modelling it. The French government text was unavailable to this research request, so no statutory wording is quoted from it.

Sources: Roulette Française.

Keep fresh wagers outside the prison example

An additional bet placed while a previous stake is held is a separate transaction. In a hypothetical zero-then-red sequence, imagine adding a fresh £20 red bet before the second spin. If the rules permit that action, the fresh bet's ordinary £40 return and the released £20 belong to different initial debits.

Combining them into a £60 return on one £20 wager would invent profit.

Our diagram deliberately contains only the original stake. It uses a branch for an immediate £10 return under la partage and a branch for £20 held under the cited prison rule. The latter then separates stake recovery from full loss.

It flags repeated zero as requiring the source's additional procedure rather than quietly treating it as a normal red or black result.

This is also a useful way to read a transaction record: assign each debit an identifier in your own notes, record any partial refund, and distinguish pending money from settled credit. The method is an accounting exercise. It does not imply that any particular casino exposes those fields or that we have tested an online imprisonment feature.

Sources: Roulette Française; Live Roulette | Best Live Casino Games | Evolution Games.

Read the online rule panel before importing a name

For gambling covered by Great Britain's remote technical standards, RTS 3 addresses access to rules, likelihood information and payout descriptions before a customer commits to gamble. Use that material to resolve the actual table's zero treatment. A search result calling something French or European roulette is a starting point for locating rules, not a substitute for them.

Write down the exact game and provider, wheel pocket count, protected wager groups, zero consequence and any repeated-zero instruction. If a provider page and the launched game's help differ, retain the wording and ask for clarification; do not silently choose whichever line gives the smaller theoretical loss.

This research confirms Evolution's public la partage description, not availability at every UK operator carrying Evolution games.

Barrière's half-loss English Roulette description further illustrates why labels travel poorly. English in that document does not mean every product with English in its name follows that clause. Equally, its land-based prison example cannot establish that a similarly named online game offers a hold, a choice between treatments, or the same recovery sequence.

The written settlement instruction must do that work.

Sources: Remote gambling and software technical standards (RTS) - RTS 3 – Rules, game descriptions and the likelihood of winning; Live Roulette | Best Live Casino Games | Evolution Games; English Roulette.

Use a zero event as a document check

To reproduce this study, begin with one stake and one bet type. Record the result required for an ordinary win, the net payout on that win, and the consequence of zero. Make a separate row for every unresolved state.

Only then calculate probabilities from the wheel assumptions. This order prevents a familiar percentage from dictating a rule the document never supplied.

A useful finished note can be very short: £20 initial red stake; zero; £10 returned; £10 lost; original wager settled. The prison counterpart initially reads: £20 initial red stake; zero; £20 held; settlement outstanding. Those records answer different questions even before the next wheel result exists.

Keep unknowns visible. We did not establish a UK online en prison catalogue, verify account credits, or derive Barrière's complete repeated-zero model. We can establish the la partage calculation and the documented difference between immediate division and delayed resolution.

That narrower result is enough to stop a half-refund being mistaken for a win, or a recovered stake being mistaken for a second payout.

Sources: Remote gambling and software technical standards (RTS) - RTS 3 – Rules, game descriptions and the likelihood of winning; Roulette Française.