The d'Alembert is a popular and classic betting system. Like most betting systems, it usually results in a small win, at the cost of huge losses sometimes. Like all betting systems, not only can't it overcome the house edge, it can't even dent it.
Like the Martingale, Labouchere and Fibonacci betting, the d'Alembert has the player chasing losses with larger bets. However, it is not as aggressive as those other progressive betting systems, resulting in more time at the table and less volatility. It is also at a cost of a lower probability of overall goal success.
Rules
The only thing that everybody seems to agree on about the d'Alembert is that the player increases his bet by a unit after a loss and decreases by a unit after a win. Other sources generally don't address the initial bet and winning or losing benchmarks. For purposes of my analysis, I start the player with a bet of one unit with a goal of winning one unit. Here
https://myfreepokies.net/ is putting the whole system more formally.
