The D'Alembert, like other betting systems can be applied to several different games although it is mainly used in roulette. Still, it can be applied to blackjack so I shall go through it now.
It's a very simple strategy to use, start out by betting whatever amount you see fit as a starting point. Then if you lose you simply add one unit on to your bet the next time round. If you win you decrease your bets by one.
So it's a simple case of increase by one after a loss, decrease by one after a win. The theory is that once you get back to your original wager, you will be in profit by whatever amount you originally wagered.
Here is a small example of how your bets would go:
5 -> loss -> 6 -> loss -> 7 -> win -> 6 -> loss -> 7 -> win -> 6 -> win -> 5 -> win
At the end of the above example when the 5 has been won, you will be in profit by the 5 units that you originally wagered.
The problem with the D'Alembert is that the profit numbers are only small due to the fact that for every "run" you're only going to profit one unit. What some people do to try and get the profits a little higher is increase the bets by two units each time rather than one.
Golden Rules
1. Increase your bets by one (or more if you're feeling lucky) after every loss.
2. Decrease your bets after every win. Remember to decrease them by the same amount that you increased them in the first place.
Reverse D'Alembert
You can also use what's called the reverse D'Alembert which is basically the opposite to what's been described above. You increase your bets by one after a win and decrease them after a loss.
When you use the reverse D'Alembert you need to decide on a winning point that you're happy with and then quit. Normally this is after 3 or 4 consecutive wins.
