D'alembert System of Placing Bets in Roulette

D'Alembert system (or the Pyramid system) was created by a famous mathematician and philosopher Jean le Rond D'Alembert. This system can be called one of the most famous among the roulette betting systems.

The Main Idea of the System

The system is modeled on the basis of the theory of the existence of balance in nature. All the numbers will land the equal number of times. But if you bet and your bet is a winning one, you will have fewer chances to win the next time and vice versa. So, according to this system, you need to bet less, when you won and to bet more, when you lost.

Principles of d'Alembert System

  • It is necessary to start with a medium bet (so you can easily take the chips off and have something left).
  • You need to place roulette bets on the even money bets (Even, Odd, Red, Black, High or Low).
  • When you choose the bet, you should place the same bet all the time.
  • When you win - you remove the chosen amount from the bet.
  • If you lose - add the amount you choose to your bet.
  • You will only win, if there is a balance between winnings & losses.


If you bet 1$ and lost, the next time you will bet 2$. If you lost again, then you next bet will be 3$. Then, if you won - your next bet will be decreased by 1 unit, so it will be a 2$ bet.

Benefits of D'Alembert System

  • The player's roulette bets do not increase as fast, as while using other betting strategies and this gives you the opportunity to stop the game at any time you like.
  • The player's bankroll is positive during the whole game.

Risks of the System

  • Single and double zero on the American roulette wheel give the house an edge of 5.28%. It means that the bet is not, actually, equal (50/50).
  • There is a possibility not to increase the bet, because other players can have the same results as you.
  • The player can't reduce the bet, if there is a long-winning streak.