The D'Alembert system is a roulette systems used for roulette players on bets that pay even money and was invented by Jean le Rond d'Alembert, a French mathematician. This betting system speaks of the "equilibrium in nature". This refers to winning or losing at the roulette table. The D'Alembert system is a negative progression system which helps to guard net profits once you win and it based upon the expectation that an even number of loses and wins will occur, or at least an almost even number of loses compared to the number of wins.
According to the D'Alembert system, which works on live or online roulette, you add a betting unit when you lose and reduce once you win. Here is an example of a regular use of the D'Alembert system when the betting unit equals $4:
|Size of Unit||Win/Lose||Change of Units||Net Profit|
|1||Win||0 (When Bet Size=1)||$4|
|1||Win||0 (See the Above)||$8|
Just like the Fibonacci system this system remains stable in the short period so there's no risk in using this betting system at the roulette table, unlike the the Martingale betting system. D'Alembert is favored by online roulette players and from a reasonable reason – it can be monitored very easily and there's no need to write down anything since it's pretty easy and obvious.
If you would like to know more about online roulette or other betting systems then you are welcomed to browse Roulette.cd's main page where you can find more info about online roulette.
Dwight Adams - Journalist. 23.3.2006