The Strategy
This is a dozens-coverage system — every spin you cover two of the three dozens, so roughly two-thirds of the wheel is "live" for you at all times.
- Dozen 2 (13–24): gets 1×progression chip on every single spin, no exceptions.
- Dozen 1 (1–12) and Dozen 3 (25–36): take turns getting the other chip. Spin 1 it's Dozen 1, spin 2 it's Dozen 3, spin 3 back to Dozen 1, and so on — alternating every spin regardless of what just happened.
Spin 1: bet on Dozen 2 + Dozen 1 → Spin 2: bet on Dozen 2 + Dozen 3 → Spin 3: bet on Dozen 2 + Dozen 1 …
What counts as a win or a loss
Since two dozens are covered, the ball can only do one of three things:
- Win: the ball lands in either of your two covered dozens. Dozens pay 2:1, so the winning chip returns 2 chips profit while the other chip you placed loses 1 — net result is +1 unit profit at your current progression size. Progression resets to the first number in your list.
- Loss: the ball lands in zero (or 00) or in the one dozen you didn't cover that spin — both chips are lost. Progression steps forward one place.
Because both bets scale together, a loss costs you 2× your current progression chip count, while a win only nets you 1× that amount. The system needs a good win rate to stay ahead, since losses are twice the size of wins in chip terms.
The progression
You supply your own sequence of chip counts, e.g. 1,2,4,6,7,9. The simulator reads it left to right:
- Start at the first number.
- Any loss → move one step to the right for the next spin.
- Any win → jump straight back to the first number.
- If you lose enough in a row to run past the end of the list, it just holds at the last number rather than erroring out.
The house edge doesn't go away
No betting progression changes the underlying odds of the wheel. European roulette carries a built-in house edge of about 2.7% per bet (one zero out of 37 pockets); American roulette is about 5.26% (two zeros out of 38). Covering 2 of 3 dozens doesn't remove that edge — the zero(s) are still uncovered, and that's where the house's advantage sits. Treat this as a way to test the betting pattern and see how the bankroll curve behaves, not as a guaranteed method of beating the game.
Using the Tool
Setup controls
- Wheel type: European (1 zero) or American (0 and 00) — switch any time, it starts a fresh session.
- Bankroll (£): your starting stake for the session.
- Chip value (£): the real money value of 1 "chip" in the progression — this scales every result shown in £.
- Loss progression: comma-separated chip counts, e.g.
1,2,4,6,7,9. Edit it any time — this also resets the session.
Running spins
- Spin: plays a single spin using the current bet and progression step.
- Auto-Spin: keeps spinning automatically until you hit Stop or the bankroll runs out. Speed is controlled by the slider (50ms–2000ms per spin), which you can drag even mid-run.
- Reset: wipes the session and starts over from your current settings.
- Saved sessions: name the current session and hit Save — progression, bankroll, chart history and spin log are stored in this browser only. You can load, rename or delete any save later.
- Share Strategy: uploads your current progression, bankroll, chip value and wheel type to a share link. Anyone opening the link loads that setup (session history is not included).
Reading the results
- Stat cards: live bankroll, net profit/loss, total spins, win/loss count, current progression step, the chip size of the next bet, and which two dozens are covered on the next spin.
- Chart: plots bankroll after every spin, so you can see the shape of the swings over a session at a glance.
- Spin log: the last 40 spins — the number drawn, which dozens were covered, the bet size, the result, and the running bankroll — so you can trace exactly what happened on any given spin.
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