d'Alembert system

The d'Alembert gambling system is a negative progression system.

In simple terms, you raise the bet when you lose and lower it when you win.

Invented by French mathematician Jean le Rond d'Alembert, it is based on 'the equilibrium of nature' which means it works when you get an even number of wins and losses for the same bet.

For that reason, it is often used by Roulette players looking for a system on the Even-money bets.

Sequence of bets

The sequence of bets in a losing streak is:

1, 2, 3, 4, 5, etc

The sequence of bets for 3 losses and 3 wins would be:

1, 2, 3, 4, 3, 2

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Cancel losses with wins

The advantage of the d'Alembert system is that it doesn't chase losses, it gets them back slowly, always certain that in the long run the results will be 50/50.