d'Alembert roulette system

No one disputes that roulette is one of the most beloved land-based and virtual casinos. But anyone who is a true fan of this game knows at least one strategy to increase the player’s advantage over the house.

While none of the strategies out there are 100% guaranteed (otherwise, roulette wouldn’t be a game of chance), there is a lot of mathematical probability involved and many stories of gamblers who ended their rounds with more money than they took in. So today, you’ll learn a bit about the d’Alembert roulette system. Ready?

What is the d’Alembert system?

Considered one of the most conservative strategies, the d’Alembert system was created by French mathematician Jean Le Rond d’Alembert and is based on the idea that an event tends not to repeat itself immediately afterwards.

Let’s think of a sequence of three-game rounds to exemplify the theory. The strategy says that you are unlikely to be victorious in all three. However, the same plan states that you are unlikely to be defeated in all three.

It is a strategy that works well on bets with 50% probability, i.e. on bets on red or black, odd or even, low numbers (1 to 18) or high numbers (19 to 36).

Starting the bet

Your first step is to define where you will place your bet. Once this is determined, you will bet in this same place until you decide to quit or restart the game.

This strategy is considered suitable for low stakes and works as follows: place a bet regarding the minimum value of the table or a little more.

  1. If you win, you must either decrease by one chip or redo the bet at the same value, if it is the minimum value of the table;
  2. If you lose, you must raise one chip by redoing your bet.




This system keeps winnings and losses balanced and is ideal for beginners and gamblers who opt for modest expenses. However, even if you bet small, you can still enjoy all the fun that roulette has to offer, as this way, you can keep your bankroll for much longer.


The winnings will never be very high because it is a very balanced and low-investment betting system.

Another disadvantage is that, although the system claims that the previous outcome is unlikely to be repeated in future rounds, we cannot forget that roulette is a game of random results above any mathematical probability strategy. 

If you enter a sequence of consecutive losses, you may not be able to reverse the loss, as the winnings are relatively low.

Final considerations

The d’Alembert system is ideal for those gamblers who want to have a lot of fun without significant losses because even the failures are balanced.

Mathematical probability methods have been used for many years in roulette games, but never forget that these games result from complete randomness. So, the most important thing is to have fun.

Now that you’ve learned how this system works, how about some practice? Log on to https://actirelandwales.com/ and see how you match mathematical probability with luck.