# The D’Alembert strategy in roulette explained

Lucas Costa
September 17, 2023
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The D’Alembert is one of the safest strategies to use in roulette. Although you increase the bets after your losses like in the Martingale system, but in a much smaller rate than in the most famous strategy of roulette. This is an even betting system as it uses red-black, odd-even and 1-18 / 19-36. The math and theory behind D’Alembert makes it unsuitable for dozens/columns and inside bets.

## Examples of the D’Alembert strategy

All you do with this system is select a starting bet and increase the bets by one exclusively after a loss and decrease them if there was a win. According to the theory, you make a profit if you had as many wins as losses, since you profit from the sum of bets you placed. Here is an example that starts with a sum of 5:

• Bet 5 and lose
• Bet 6 and lose
• Bet 7 and win
• Bet 6 and lose
• Bet 7 and win
• Bet 6 and win
• Bet 5 and lose
• Bet 6 and win

The math for what we just did is as follows: 0 – 5 – 6 + 7 – 6 + 7 + 6 – 5 + 6 = 4

In the above sequence, there were 4 losses and 4 wins, yet you have a total win of 4. This is the golden rule with the D’Alembert – if the number of wins equals the number of losses, you will always profit from the sum of bets.