20 systems · 20,000 identical seeds each

Does any roulette betting system work?

20 betting systems, each run through the same 20,000 seeded sessions on a European wheel and again on an American one. The most persistent walks away $200 up 78% of the time. Every one of them loses between $2.52 and $2.87 per $100 wagered, which is the house edge and nothing else.

By Jesse (Human)Published 2026-10-06Last reviewed 2026-10-06

Same rules, same spins, every system

Each session starts with $1,000, bets in $5 units, and ends at the first of: up $200, 500 spins, or a required stake the bankroll or the $500 per bet limit can’t cover. Every system sees the identical sequence of spins, so differences between rows come from the betting rules alone.

Betting systems ranked by how often they walked away $200 up, European wheel
System	Walked away +$200	Busted	Mean result	Per $100 wagered
Dozen Martingalenegative progression	77.8%	22.2%	−$29	−$2.55
Labouchèrenegative progression	76.2%	23.8%	−$50	−$2.69
D’Alembertnegative progression	71.6%	28.4%	−$119	−$2.87
Oscar’s Grindnegative progression	71.6%	28.3%	−$123	−$2.67
Reverse Labouchèrepositive progression	71.5%	28.5%	−$92	−$2.66
James Bondcoverage	69.7%	30.3%	−$136	−$2.66
Fibonaccinegative progression	69.1%	30.9%	−$72	−$2.78
Martingalenegative progression	68.7%	31.3%	−$32	−$2.52
Grand Martingalenegative progression	67.9%	32.1%	−$25	−$2.66
Contra D’Alembertpositive progression	67.8%	31.4%	−$160	−$2.71
Single numberflat stake	67.0%	11.0%	−$32	−$2.74
Hot number (Andrucci-style)pattern	66.2%	9.6%	−$30	−$2.73
Reverse Martingalepositive progression	65.2%	23.0%	−$96	−$2.70
Fixed fraction (2%)flat stake	41.8%	0.0%	−$142	−$2.69
1-3-2-6positive progression	29.2%	0.0%	−$111	−$2.71
Parolipositive progression	21.0%	0.0%	−$101	−$2.69
Romanoskycoverage	11.8%	14.3%	−$483	−$2.70
Two Dozenscoverage	5.5%	0.0%	−$133	−$2.72
Flat bettingflat stake	2.1%	0.0%	−$67	−$2.71
Betting against a streakpattern	0.0%	0.0%	−$4	−$2.77

European wheel, 20,000 sessions per system. American-wheel results are on each system’s page. Download every row for both wheels (CSV).

Why the last column barely moves

Every bet on a European layout returns −1/37 of its stake on average, about −$2.70 per $100. A system decides when and how much to bet, but each of those bets still carries −1/37, so the total is −1/37 of everything wagered. The spread in the last column is sampling noise. What a system can change is the shape: how often a session ends ahead, how deep the losing sessions go, and how much gets wagered along the way. The same-seed comparison study works through this for five of them in more detail.

Negative progression

Raise the stake after losses. High success rates, paid for by rare sessions where the stake outgrows the bankroll or the table.

Martingale

Does the Martingale system work?

Double the stake after every loss, return to one unit after a win.

+$200 in 68.7% · −$2.52 per $100 · code included →Grand Martingale

Does the Grand Martingale system work?

Double the stake and add one unit after every loss.

+$200 in 67.9% · −$2.66 per $100 · code included →Fibonacci

Does the Fibonacci roulette system work?

Move one step up the Fibonacci sequence after a loss, two steps back after a win.

+$200 in 69.1% · −$2.78 per $100 · code included →D’Alembert

Does the D’Alembert system work?

Add one unit to the stake after a loss, remove one after a win.

+$200 in 71.6% · −$2.87 per $100 · code included →Labouchère

Does the Labouchère system work?

Bet the sum of the first and last numbers on a list; cross them off on a win, append the stake on a loss.

+$200 in 76.2% · −$2.69 per $100 · code included →Oscar’s Grind

Does Oscar’s Grind work?

Aim for one unit of profit per series, raising the stake only after a win.

+$200 in 71.6% · −$2.67 per $100 · code included →Dozen Martingale

Does a Martingale on dozens work?

Bet one dozen and raise the stake after each loss so the next 2:1 win recovers everything.

+$200 in 77.8% · −$2.55 per $100 · code included →

Positive progression

Raise the stake after wins. Small, frequent losses between streaks; the risk per spin stays low.

Reverse Martingale

Does the Reverse Martingale system work?

Double the stake after every win, return to one unit after a loss.

+$200 in 65.2% · −$2.70 per $100 · code included →Paroli

Does the Paroli system work?

Double after a win, bank the streak after three wins in a row.

+$200 in 21.0% · −$2.69 per $100 · code included →Contra D’Alembert

Does the Contra D’Alembert system work?

Add one unit after a win, remove one after a loss.

+$200 in 67.8% · −$2.71 per $100 · code included →Reverse Labouchère

Does the Reverse Labouchère system work?

Labouchère inverted: append the stake on a win, cross off two numbers on a loss.

+$200 in 71.5% · −$2.66 per $100 · code included →1-3-2-6

Does the 1-3-2-6 system work?

Stake 1, 3, 2, then 6 units across a winning run; reset on any loss.

+$200 in 29.2% · −$2.71 per $100 · code included →

Flat stake

No progression. The control group: what the edge does with nothing on top.

Single number

Does betting on one number every spin work?

One unit straight-up on 17, every spin.

+$200 in 67.0% · −$2.74 per $100 · code included →Fixed fraction (2%)

Does betting a fixed percentage of your bankroll work?

Stake 2% of the current bankroll on red, every spin.

+$200 in 41.8% · −$2.69 per $100 · code included →Flat betting

Does flat betting work at roulette?

One unit on red, every spin, no progression. The baseline.

+$200 in 2.1% · −$2.71 per $100 · code included →

Coverage

Spread one stake across many pockets. Win most spins, win small, lose big on the rest.

James Bond

Does the James Bond roulette strategy work?

Spread 20 units across high (19–36), the 13–18 six-line, and zero.

+$200 in 69.7% · −$2.66 per $100 · code included →Two Dozens

Does betting on two dozens work?

One unit each on the first and second dozens, every spin.

+$200 in 5.5% · −$2.72 per $100 · code included →Romanosky

Does the Romanosky roulette system work?

Two dozens at three units each plus two corners at one unit, covering 32 numbers.

+$200 in 11.8% · −$2.70 per $100 · code included →

Pattern

Bet on what the wheel has been doing. On independent spins, the past says nothing about the next result.

Hot number (Andrucci-style)

Does betting on hot numbers work?

Watch 37 spins, then bet straight-up on whichever number has hit most.

+$200 in 66.2% · −$2.73 per $100 · code included →Betting against a streak

Does betting against a streak work in roulette?

After five reds (or blacks) in a row, bet the other colour.

+$200 in 0.0% · −$2.77 per $100 · code included →

Method

Sessions: 20,000 per system per wheel, 800,000 in total
Master seed: 0x6d2e6c8b, shared by every system
Outcome path: The two-stage seeded generator used by Engineer mode, unmodified
Verification: Each system’s Lua is replayed through the production kernel in the test suite and must match the bulk run exactly

Have a system that isn’t here? Write it in Engineer mode, run it on the same seeds, and send it in. If it beats the last column, that’s a bug worth finding.