Here we discuss a variant on the D’Alembert System, called The Stretched D’Alembert.
This was a system that was proposed by a chap called Henry Chateau.
If we look at the standard D’Alembert, the system is basically a progression on the even money bets (red/black etc) which follows a sequence as follows:
1, 2, 3, 4, 5, 6, 7 – etc.
The progression always begins with a base bet of 1 unit.
If you lose, you add a unit. if you win, you take away a unit.
The risk here is that you hit a long losing streak which makes it difficult to get back down to your starting level- potentially you are having to fund any swings with a big bank roll.
In The Stretched D’Alembert, you increase your bets by fractions (say 1/4 or 1/10). Let’s say we go for a tenth. Your progression would be:
1.1, 1.2, 1.3, 1.4, 1.5, 2.1, 2.2, 2.3, 2.4, 2.5, 3.1, 3.2 for example. Your system is to raise the sequence by 0.1 for 5 plays, at which stage you move to 2.
But how do you bet fractions, I hear you ask? Well, actually, when you bet, you round the bet down to the lowest whole number. The progression, is in effect, just a book keeping exercise to help you to tame your progression. You are building in a dampener into the sequence, if you like.
This keeps your swings down in the event of a prolonged losing streak.