D'Alembert System

The idea behind the D’Alembert System, which is designed to be applied to bets that have even odds, is that if you win a wager, it’s likely you will lose the next and if you lose a wager, then it’s likely you will win the next.

 

 

First, you decide how large your unit bet will be. This can be determined by the table minimum. If you’re playing at a table with a $10 minimum, that will be your unit. Start with the minimum bet. Here’s a possible seven bet sequence using the D’Alembert System.

 

• Bet $10. Win.

• Keep the wager the same. Bet $10 and lose.

• Add a unit. Bet $20 and lose.

• Add another unit and bet $30. Win.

• Subtract one unit. Bet $20 and win.

• Subtract one unit and bet $10. Lose.

• Add one unit and wager $20.

 

 

The problem with the D’Alembert System is it is based on a fallacy that says on even odds wagers the two outcomes will basically even out. If you win, then you’re bound to lose on your next turn and vice versa. This is in essence the Gambler’s Fallacy, which is based on the belief that the first of two successive events, such as the first spin of the roulette wheel, has an influence on the next event, such as the second spin. But these two spins are independent of one another and the first in no way determines what will happen on the second. D’Alembert made some important contributions to math and science but one of them was not his system for roulette. This system is not recommended.