The D’Alembert Roulette System – A Free Guide

Roulette Systems

Last week I outlined one of the most popular roulette systems used today- the Andrucci Roulette System.  That system is based on chaos theory, predicting that over the short term, some numbers will come up more often than others.  The system works by the player identifying these numbers and then betting that they will continue to win.

Proponents of the D’Alembert System say that is all garbage.

D’Alembert Roulette System

When roulette first became popular in Western Europe in the 18th century, people scrambled to create a system that could beat the roulette wheel.  Out of this roulette gold rush came a simple “negative progression” system that many people still use to this day.

Mathematician Jean le Rond D’Alembert invented this roulette system based on the idea that over the long run, all of the numbers will come up an equal number of times.  Therefore, he theorized, if you make a bet and win, chances are the next spin will be a loser, and vice versa.  With this in mind, Mr. D’Alembert came to the conclusion that if you bet less after a win and bet more after a loss, you will capitalize on this “law of probabilities” for massive profits!


How to use the D’Alembert Roulette System

To use the D’Alembert Roulette System, you first have to have a roulette game to play.  Download a free one from Silver Oak Casino here:

Before we get to the step by step guide to this roulette system, you have to keep the following rules in mind when using the D’Alembert System:

  • Always start with a medium sized wager.  A medium sized wager means you should be able to take chips off of the bet several times while still having something left.  For example, if you are playing at a $1 minimum table, a bet of $20 would allow you to remove $1 chips from your bet 19 times before you cannot remove anymore chips.  This would be a good medium sized bet.  If you want to play with more significant stakes, start with a slightly larger wager and add or subtract $5 at a time.
  • When using this system, make sure to only place wagers on the 50/50 “outside bets” such as Red, Black, Even, Odd, 1st 18, or 2nd 18.  The D’Alembert Roulette System only works using these bets.
  • Once you decide on what you want to bet on (red, black, etc), make sure to bet on the exact same thing for the entire game.  This is important.

To try out the D’Alembert roulette system for yourself, follow these steps:

  1. Start by deciding the denomination you will be adding and subtracting to your bet after each win or loss.  This is important because the amount you add or remove has to be consistent for the system to work.
  2. Place a medium sized bet on your favorite 50/50 outside bet (see above).
  3. If you win, remove the amount you decided on (step 1) from your bet.  If you lose, add the amount you decided on to your bet.
  4. Wager this on the exact same thing you bet on in step 2.

To continue playing with the system, simply repeat steps 3 and 4 for your entire roulette session.

Does the D’Alembert Roulette System Really Work?

Well, in theory it sounds nice.  Every time you win, you bet less on the next wager so if you lose, you lose less than you won on the first wager.  Since the system takes into account your entire wagering history, you should always stay in positive territory, right?

There are a couple of problems with the system, however.  First of all, the system assumes that the bet you are making on red, black, etc. is actually a 50/50 bet.  However, because there is a green 0 square (and a green 00 square in American Roulette), the bet is not actually 50/50… it is actually a 48.65/48.65/2.7 bet.  This mean that even if the system works flawlessly, the casino will still take 2.7% of your wagers over time.

The second problem with the system is the idea that if your bet wins the first time, it is more likely to lose the next time.  In reality, every spin of the roulette wheel is a completely independent event, and past spins have no effect on future spins.  In other words, if your bet wins the first time, it is just as likely to win the second time, and the third time, etc.

Final Thoughts

If you want to learn more about how to play and win at roulette, check out the roulette strategy guide, or some of our other roulette articles: all about the roulette wheel layout, how to make roulette bets, all about roulette odds, the roulette glossary.

Have you used this system?  Does it work for you?  What other systems do you want us to teach here on the Silver Oak blog?  Let me know in the comment section below!