D'Alembert betting strategy

The D'Alembert betting strategy, named after the French mathematician Jean le Rond d'Alembert, is a progressive system that is considered less aggressive than the Martingale. It's typically applied to even money bets, such as red or black, odd or even, and high or low numbers in games like roulette. The strategy begins with setting a base bet, for example, 10 units, and an adjustment amount, which is used to increase or decrease bets. If a bet is lost, the bet size is increased by the adjustment amount, so if the adjustment is set to 1 unit, the next bet would be 11 units. Following a win, the bet size is reduced by the same adjustment amount, but it will never drop below the base bet of 10 units, ensuring bets do not go lower than the starting point.

How to apply D'Alembert betting strategy in roulette

The D'Alembert Roulette System can be implemented in two ways. The first method involves setting a base bet and an adjustment bet, which we use to increase or decrease our stakes. The second method, which is simpler, involves using the base bet as the adjustment bet. Let's begin by discussing this simpler method first, as it's easier to understand.

With base bet only

We start by choosing a base bet, ideally keeping it low, as it forms the foundation of our betting sequence. For illustration, let's use $5. Given the variability of the system, if we ever face a situation where the recommended bet falls below $5, we'll default to a $5 bet to maintain our minimum betting threshold.

The D'Alembert system operates on a simple principle: following a loss, we add the base bet amount ($5 in this case) to our current bet. Conversely, after a win, we reduce our next bet by the same base amount.

Before diving into betting, we select our preferred type of bet. This strategy is specifically tailored for even money bets, which include options like red or black, odd or even, and ranges of 1-18 or 19-36, all offering a 1:1 payout.

Let's walk through a sequence to illustrate: We kick off with a $5 bet and unfortunately lose. Consequently, our next bet increases to $10. Should we lose again, our bet escalates to $15. However, if we win the following round, we dial back our bet to $10 by decreasing it from the $15 bet.

Step Bet Amount Outcome Next Bet
1 $5 Lose $10
2 $10 Lose $15
3 $15 Win $10

Let's go through another sequence. We start by betting $5 and lose, so we move up one step to a $10 bet. If we lose again, our next bet increases to $15. Should we win the next round, we step down to a $10 bet. If we win again, we reduce our bet to $5. Following another win at this stage, we remain at a $5 bet and do not decrease any further.

Step Bet Amount Outcome Next Bet Total Win/Loss
1 $5 Lose $10 -$5
2 $10 Lose $15 -$15
3 $15 Win $10 $0
4 $10 Win $5 $10
5 $5 Win Stay at $5 $15

With base and adjustment size

In the alternative approach involving both a base bet and an adjustment size, let's continue with a base bet of $5 and set the adjustment size to $1. Unlike the previous method where we increased by $5 each time, here we only adjust by $1. This approach, while less common than using just a base bet, offers more flexibility.

To illustrate, let's consider a simple sequence: We start by placing a $5 bet on red. If we lose, we add $1 to our next bet, bringing it to $6. Should we lose again, our next bet increases to $7. Upon winning, we decrease our next bet by $1, resulting in a $6 bet. This method allows for finer adjustments to our betting strategy.

Where to Play:

For most roulette systems, we recommend playing at a European roulette table, as it offers better odds compared to the American version, which includes both 0 and 00, giving the house a slightly greater edge. Ultimately, the choice should align with your personal playing style. For the best experience, playing in a live setting is ideal, and this option is available at many online roulette sites today. If you can find a casino offering live French roulette tables, that's a great option. However, most live casinos today primarily feature the European table layout.

Comparing to Other Progressive Betting Systems:

If you prefer a slow and steady approach, the D'Alembert system is an excellent choice. In contrast to more aggressive strategies like the Martingale, which involves rapid increases in bets leading to a faster depletion of your bankroll in a losing streak, the D'Alembert system operates at a slower pace, allowing for more controlled play. However, it's crucial to recognize that with any progressive betting system, encountering a losing streak can significantly impact your bankroll, potentially depleting it more quickly than if you weren't using a progressive strategy at all.

Pros and cons of using D'Alembert in gambling

The D'Alembert strategy is suitable for those seeking a steady gambling experience, particularly in roulette. However, compared to the Martingale system, a drawback is that D'Alembert may require more time to recover losses. While the Martingale system allows for quicker recovery of lost bets, D'Alembert's more gradual approach means it can take longer to see returns.


The D'Alembert system is generally suitable for even-money bets. However, for those interested in applying it to flat betting, there is potential for adaptation. An example of a compatible flat betting system is the 3/2 roulette strategy, where incorporating an adjustment size could effectively utilize the D'Alembert system.


It's essential to acknowledge that roulette is among the casino games with a high house edge. Therefore, it's advisable to gamble only with funds you're prepared to lose.


Which bets should be used with the D'Alembert system?

The D'Alembert system is best applied to even-money bets such as red, black, odd, even, 1-18, and 19-36. It's most effective when played on a European roulette table.