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D’Alembert Betting System in Roulette – How & When To Use It

The D'Alembert betting system is one of the simplest and most popular strategies used in gambling, including roulette. It bears most similarities to the Martingale strategy, but it’s far less aggressive, making it common among beginners and casual roulette players.
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Below, you can learn how the D’Alembert betting system works and decide whether it fits your gambling style. 

What Is the D’Alembert System — The Gambler’s Fallacy

The D’Alembert betting system is named after Jean-Baptiste le Rond D’Alembert, an 18th-century French mathematician. During the research, D’Alembert concluded that external and inertial forces acting on bodies form an equilibrium system. This conclusion became known as the D’Alembert Principle and laid the foundation for Newton’s Second Law.

According to him, the chances of a coin landing on heads increases if it has already landed on tails multiple times in a row.

In roulette, the D’Alembert equilibrium law stemmed from the idea that future outcomes could balance the unlikely results in the past. For instance, if a ball lands on black several times in a row, it’s bound to fall into the red pocket, becoming the more likely outcome. 

However, the premise itself is flawed as the odds remain the same, regardless of the previous outcomes. This concept is also known as the gambler’s fallacy, and many casino players have fallen for it, chasing losses and going bust. 

Does the D’Alembert System Work?

D'Alembert Strategy RouletteThe D’Alembert is a negative progression system standard in even-money roulette wagers. It harnesses the idea that players should have roughly the same amount of winning and losing bets.

So, instead of decreasing the stake after losing, a player increases it. Likewise, a player should reduce the stake after winning a wager.

It’s a straightforward betting system with only several rules. Here’s a short guide on the steps you should take:

  1. Decide on the base unit — Before starting the game, decide on the base staking unit. The amount could be as high or as low as you’d like, but a rule of thumb is that it shouldn’t exceed 5% of your entire roulette bankroll.
  2. Start with one unit — Start the roulette session with the precise unit and return to it every time you begin a new game.
  3. Increase the stakes after a loss — If you lose a wager, you’ll increase the stake by one unit. So, if your initial stake was $5, the next one should be $10, and so on.
  4. Decrease the stake if you win — After a winning bet, you’ll reduce the stake by one unit. You won’t have to change the bet amount if you’ve won with the base unit.

Implementing the D’Alembert betting system is simple, but the question is — does it work?

Many players have tried and tested this strategy, and one thing is sure — the D’Alembert system can help you win in the short term, even if you lose a series of wagers.

However, for that to happen, you need a particular sequence of results. That’s where we see the main flaw, as any series is possible, and entering a lengthy losing streak can be quite costly.

The main weakness of the D’Alembert system is that nothing can guarantee if or when the losing streak will end. Therefore, while it can be advantageous for a short gambling session, it can also decimate your entire bankroll without giving you a chance to recoup the losses.

Pros and Cons of the D’Alembert System

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Each roulette strategy has its advantages and downsides, and the same goes for the D’Alembert betting system.

Before deciding whether to implement this strategy or not, check out the pros and cons below.


    • It carries less risk than other roulette betting systems.
    • It doesn’t require thick wallets or substantial bankrolls to work.
    • It helps you recoup your losses.
    • It’s easy to learn and master.


    • It doesn’t yield big wins.
    • It can take a while before you compensate for the losses.
    • It can’t guarantee success.

D’Alembert System vs. Other Roulette Betting Systems

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Over the years, roulette experts have created many strategies to try and boost their winning odds. Today, players can choose between several tried-and-tested betting systems such as:

Each focuses on different game elements and carries specific rules that apply to various playing styles. While most are aggressive and require higher stakes, the D’Alembert system is the most efficient in low-stakes roulette games

For instance, the Martingale system requires you to double your stakes after winning, which can be quite risky. On the other hand, the Fibonacci strategy, which relies on the famous string of numbers, requires players to join the last two bets and place them in a new round. 

Both strategies imply increasing your stake after winning, while the D’Alembert offers some balance between raising and reducing the stakes. Therefore, the D’Alembert could help you minimize the losses without hitting the table limit or going bust.

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Although everyone knows that roulette strategies can’t guarantee wins, they can give more winning opportunities and help preserve your bankroll. The same goes for the D’Alembert system. It’s a simple strategy to implement and somewhat safer than other betting systems, as the pace at which you increase your stakes is slower.

However, it’s unlikely you’ll cover your previous losses with one winning bet, so it’s crucial to understand the risks before moving on with the strategy.  


Who is credited with inventing the D'Alembert betting system? The D'Alembert betting system was invented by the French mathematician and philosopher Jean-Baptiste le Rond D'Alembert.
What is the D'Alembert betting system? The D'Alembert betting system is a strategy that helps players increase their winning chances and manage their bankroll during systematic gambling sessions. Essentially, it’s a negative progression system, meaning that each time you lose a bet, you must increase your next bet to recoup your losses.
Does the D’Alembert betting system work? Yes, this roulette betting strategy can help you make a profit in the short term and recuperate for the losses. However, the system requires a special sequence of results to yield a positive outcome.
What are the benefits of using the D'Alembert betting system? The D’Alembert betting system has several advantages, the biggest being its simplicity and slow progression. The D’Alembert isn’t an aggressive betting system, making it an excellent solution for beginners.
Is the D’Alembert betting system dangerous to use? While the D’Alembert betting system helps you recoup your lost wagers, it can go in a different direction and lead to chasing losses, one of the biggest dangers of gambling.

About the Author

Author Hi all! My name is Jayson Peter, and I am the Chief Editor here at Casino USA. I have always been a huge fan of casinos, but I noticed that there are not a lot of websites out there that discuss the gambling industry in enough detail, so that’s how the idea for was born. With my extensive knowledge of the industry and the help of my team, I am ready to give you an insight into the exciting world of casino gambling in the United States.