Before anything else, one thing needs to be said clearly: roulette is a game of chance, and no strategy — the SOSO included — eliminates the house edge. What strategy can do is reduce impulsive decision-making, keep you on the bets with the best odds, and give your session more structure. If you are looking for a system that is genuinely simple to remember, keeps you on even-money bets, and removes the temptation to chase patterns emotionally, the SOSO strategy is worth understanding properly. This guide covers exactly how it works, what the mathematics actually say, and where it fits alongside other approaches you might have seen.
Understanding Roulette – The Basics
The house edge in roulette is fixed and applies to every single spin regardless of how you bet. On a European wheel (single zero, 37 pockets), the house edge on even-money bets sits at 2.7%. On an American wheel (double zero, 38 pockets), it climbs to 5.26%. French roulette offers the best terms for players using even-money bets: the La Partage rule returns half your stake when the ball lands on zero, cutting the house edge to 1.35% on red/black, odd/even and 1-18/19-36 bets.
That 2.7% means that for every £100 wagered over a long run of play, the casino statistically retains £2.70. Over thousands of spins, this edge is mathematically certain. In a single session, variance can produce winning runs that feel like the system is working — and losing runs that feel just as convincing.
The other fundamental point: each spin of the wheel is an entirely independent event. The wheel has no memory. A run of ten consecutive reds does not make black more likely on the next spin. The probability of red or black on any given spin in European roulette remains 18/37 — approximately 48.6% — regardless of what came before. This matters enormously when evaluating any system that bases bets on the previous result.
What Is the SOSO Strategy?
SOSO stands for Same, Other, Same, Other. It is a selection system — meaning it tells you which colour to bet on, not how much to bet. The principle is straightforward: you alternate between betting the same colour as the previous result and betting the opposite colour, following the pattern S, O, S, O, S, O in sequence.
The rule for each step:
On a Same turn: bet whatever colour just came up. On an Other turn: bet the opposite colour to whatever just came up.
Here is how it plays out across five spins:
Spin 1 result: Red. Your next position in the sequence is S (Same). You bet Red. Spin 2 result: Black. Your next position is O (Other). Black came up, so you bet Red. Spin 3 result: Black. Your next position is S (Same). You bet Black. Spin 4 result: Red. Your next position is O (Other). Red came up, so you bet Black. Spin 5 result: Black. Your next position is S (Same). You bet Black.
The key point is that your position in the S-O sequence is predetermined and advances regardless of whether you win or lose. You are not reacting emotionally to results — you are following a fixed pattern that tells you where to place each bet before you see the outcome.
How the SOSO Strategy Works — Step by Step
- Choose European roulette (single zero) or French roulette with La Partage where available. Avoid American roulette.
- Set a flat stake you will use on every spin — SOSO is not a staking system, so your bet size stays the same throughout.
- Note the result of the first spin. This result is not bet on — it simply tells you where to start.
- Your first betting position is S (Same). Bet the colour that just came up.
- Whatever the result, advance to O (Other). Bet the opposite of whatever colour just came up.
- Advance to S (Same). Bet the colour that just came up.
- Continue alternating S and O for the duration of your session.
- Stick to your pre-set session limit — both in time and money — before you sit down.
The system requires no tracking of win or loss streaks. The only information you need is the most recent result and where you are in the S-O sequence.
What SOSO Actually Does — and Does Not Do
The honest mathematical picture first: the SOSO strategy does not change the house edge. Because each roulette spin is independent, the colour you bet on is statistically irrelevant to your long-term expectation. Whether you bet Same, Other, always Red, always Black, or flip a coin to decide — the expected value per spin on European roulette remains -2.7% of your stake. SOSO produces no mathematical advantage over any other selection approach.
What it genuinely does offer is worth being specific about.
It keeps you exclusively on even-money bets. Red/black, odd/even and 1-18/19-36 give you the best odds available on a standard roulette table. Players who drift into straight-up numbers (35:1 payout, 2.7% chance) or five-number bets face far worse expected returns. SOSO keeps you away from those bets entirely.
It removes emotion-driven selection. One of the most common and costly patterns in roulette play is the gambler’s fallacy — the belief that a colour is somehow “due” after a streak. A run of five consecutive reds can feel like a compelling reason to pile onto black. SOSO bypasses that instinct by giving you a mechanical rule that has nothing to do with streak length. You follow the sequence; you do not second-guess it.
It provides a consistent framework for a session. A player with no system often bets larger when they feel confident and smaller when they feel rattled. Flat-stake SOSO produces a consistent experience that is easier to review and manage.
What it does not do: it does not guarantee any particular session outcome, does not reduce the house edge, and does not increase your probability of winning any individual spin compared to any other even-money selection method.
Common Mistakes UK Players Make with Roulette Systems
Treating the system as an edge generator. No pattern-based selection system can convert a negative expected-value game into a profitable one over time. Players who believe SOSO or any other system genuinely beats the house are setting themselves up for longer and more expensive sessions than they planned. The strategy is a framework for structured play — nothing more.
Playing American roulette. The double zero adds a 37th losing outcome on even-money bets without any corresponding increase in the payout. The house edge nearly doubles, from 2.7% to 5.26%. For UK players using SOSO or any other flat-stake system, this makes a meaningful difference to how long a session bankroll lasts. Always choose European or French roulette at UKGC-licensed casinos.
Abandoning the system mid-session and increasing stakes. The moment a player deviates from flat staking — doubling after a loss, increasing bets after a win streak — they have switched from SOSO into a staking system, often the Martingale, without realising it. This increases variance significantly and can produce large, fast losses. If you decide to combine SOSO with a staking system, understand the risks of that staking approach separately and thoroughly before doing so.
Mistaking short-run results for evidence. A player who uses SOSO and has a winning session may conclude the system works. A player who uses it and has a losing session may conclude it does not. Neither session is enough data to evaluate anything. Roulette variance is high over short runs. The house edge only becomes reliably apparent over thousands of spins, not dozens.
Not setting a session limit before starting. SOSO gives you no natural stopping point. Without a pre-decided loss limit and win goal, a winning run can easily turn into an extended session that erodes earlier gains. The time to set your limits is before the first spin, not after the fourth losing bet.
Tips for Online Play
Online roulette runs significantly faster than live table play. A live casino table might see 30 to 40 spins per hour; an online RNG game can produce that in minutes. This matters because a higher number of spins per hour means the house edge applies more frequently. If you are using SOSO for a session of intended entertainment, consider live dealer roulette at UK-licensed casinos — the pace is more comparable to a physical table and gives you time to track your position in the S-O sequence without rushing.
Most online roulette games also offer an autoplay function. Avoid it when using SOSO. The system requires you to note the result of each spin to determine your next bet, and autoplay removes that manual step, making it easy to lose track of the sequence and — more importantly — easy to lose track of how much you are spending and how long you have been playing.
Many UK-licensed online casinos offer free-play versions of their European roulette games. Using these to practise the S-O sequence before playing with real money costs nothing and removes any pressure to remember the system while also managing real stakes.
For a broader look at how to choose where to play, the team at MyCasinoReviews covers UKGC-licensed casinos in full, including live roulette availability and game quality.
Which Roulette Variants Should You Play?
European roulette is the baseline. One zero, 37 pockets, 2.7% house edge across all bets. This is the version to default to when nothing better is available.
French roulette with La Partage is the best option for SOSO players. Because SOSO is exclusively an even-money system, La Partage — which returns half your stake if the ball lands on zero — directly reduces the house edge on every bet you make, from 2.7% to 1.35%. Over a session of any meaningful length, that difference matters. If your chosen UK casino offers French roulette, use it.
American roulette should be avoided for the reasons already covered. The 5.26% house edge is nearly double European roulette for the same bets and the same payouts.
Mini roulette, lightning roulette, and novelty variants typically carry modified payout structures or additional house edges. None are the right choice for a player using a flat-stake, even-money system like SOSO.
If you want to compare which roulette variants different UK casinos offer, our casino bonus guide also covers game availability as part of the overall review criteria, and our how to win section covers other games in the same factual format as this guide.
Our Honest Assessment
The SOSO strategy will not give you a mathematical edge at roulette. No selection system can. What it offers is a clean, memorable framework for even-money play that removes emotional decision-making and keeps you away from high-edge bets. For a player who wants a simple rule to follow without tracking complex sequences or adjusting stake sizes, it is as good an approach as any — and better than most, precisely because it does not involve increasing bets after losses.
The player who used it and reported ending approximately even was not proving the system works — they were experiencing normal short-run variance. Another session could just as easily have gone the other way. The honest expectation is a slow, steady cost of roughly 2.7p per pound wagered on European roulette, with swings in either direction across any given session.
Play it on European or French roulette, use flat stakes, set your limits before you start, and treat it for what it is: a structured way to enjoy roulette, not a route to guaranteed profit.