Reverse D'Alembert roulette strategy: 100,000 sessions simulated
The Reverse D'Alembert raises the stake after a win and lowers it after a loss. See the honest win rate and average result from 100,000 simulated single zero roulette sessions.
At a glance, from 100,000 simulated sessions
- Finished ahead
- 23.9%
- Ran out of points
- 0.0%
- Average result
- -70 points
What it is and how it works
The Reverse D'Alembert is the mirror image: add one base unit after a win, remove one after a loss, never going below the base unit. It leans into winning runs and pulls back during losing ones.
Like the Paroli, it grows the stake with points the table has just paid out, so the bankroll drains slowly.
A simple example at a base bet of 5
- Bet 5 on red. It wins, returning 10.
- Bet 10. It wins, returning 20.
- Bet 15. It loses.
- Bet 10. The stake steps back down after each loss.
What our simulation shows
We ran 100,000 sessions of this system against a fair single zero wheel, each session lasting up to 100 spins, starting with 500 virtual points and a base bet of 5. Those are the amounts the app's Strategy Simulator tab starts with; there a run has no round limit, and goes on until you stop it, the points set aside run out or the table refuses its next bet. A session here ends early if the bankroll can no longer cover the next required bet.
| Sessions simulated | 100,000 |
|---|---|
| Sessions that finished ahead | 23.9% |
| Sessions that finished level | 0.1% |
| Sessions that finished behind | 76.0% |
| Sessions that ran out of points | 0.0% |
| Average result per session | -70 points |
| Typical (median) result | -185 points |
| Average total staked in a session | 2,594 points |
| Loss predicted by the house edge | 70.1 points |
| Best session seen | +4,800 points |
| Worst session seen | -355 points |
| Average longest run of losing spins | 6.2 |
| Longest run of losing spins seen | 24 |
Read that table slowly. The share of sessions finishing ahead is often the number that sells a system, and on its own it is misleading: what matters is the average result, which includes the sessions that went badly.
Why this system cannot overcome the house edge
A single zero wheel has 37 pockets. An even money bet such as red wins on 18 of them and loses on 19, so every point you stake returns 36 of 37 points on average. That is a loss of 2.7027% of everything staked, and it applies to every single bet no matter what size it is or what order the bets come in.
Our simulation shows this directly. Across 100,000 sessions this system staked an average of 2,594 points per session. Applying the edge to that amount predicts a loss of 70.1 points. The simulation actually produced an average of -70 points.
The staking pattern changed how the wins and losses were spread out. It did not change the total. That is the whole story of every betting system: they move risk around, and nothing more.
Strengths and weaknesses
Strengths
- Losing runs shrink the stake, so the bankroll lasts a long time.
- It cannot bust from its own progression.
Weaknesses
- Because the stake is largest when a winning run ends, the end of a good run gives back a disproportionate amount.
- It stakes a large total over a long session, and the edge applies to all of it.
Who it might suit
The Reverse D'Alembert suits players who prefer to press when things are going well and ease off when they are not, and who want a system that will not end their session abruptly.
Common questions
Is the Reverse D'Alembert better than the D'Alembert?
Neither changes the edge. In our simulations the reverse version finished ahead less often, because it is holding its largest stake exactly when a winning run is about to end, but it never busted from its own progression.
Does pressing on a hot streak work?
Streaks are visible only after they have happened. Each spin is independent, so there is no way to know during a run whether the next spin continues it. Pressing changes the shape of the results, not the average.
Test it yourself
Open the Strategy Simulator tab in the app with Reverse D'Alembert already selected and watch it play on the live table with virtual points: its chips on the felt, the wheel spinning, its points rising or falling round by round.
The app's cards measure every system on the spins your own table has dealt, with a larger budget and longer sessions, so their figures will not match this page. The edge is the same in both.