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The Stretched d’ Alembert Betting System Explained

Jennifer Lynn Written by Jennifer Lynn
Richard Grant Reviewed by Richard Grant

The Stretched d' Alembert Betting System

The original Stretched d`Alembert progression for the even-money chances follows an arithmetic row:
1 – 2 – 3 – 4 – 5 – 6 – 7 – etc.

It always starts with a base bet of 1 unit. After a loss, the bet size in the next stage is raised by 1 unit and after a win, the bet size for the next stage is reduced by 1 unit.

Example 1:

For ease of demonstration, we bet continuously on BLACK.
( We strongly advise not to use this kind of betselection )
Stretched d' Alembert system bet black

The dangers of this type of progression are strong deviations which sometimes require quite large bets for a return to the balance. In our 1. For example, the highest downswing is minus 86 units, the largest bet is 14 units. The bankroll required must be very large.

Henry Chateau found a way to considerably reduce the risk of very large bets by increasing the bet size by fractions of 1/4, 1/5, and even 1/10 of the original unit.

But how might it be possible to raise a minimum wager of for example USD 5 by 1/10?
The solution for this problem is “indexed” bets:

1.1, 1.2, 1.3, 1.4, 1.5, 2.1, 2.2, 2.3, 2.4, 2.5, 3.1, 3.2, etc. pp.

We bet the following sequence of 1.1, 1.2, 1.3, 1.4 and 1.5 with 1 unit prior to raising the bet to 2 units. Then we play the sequence of 2.1, 2.2, 2.3, 2.4 and 2.5 with 2 units before we raise to 3 units, etc.

The bet size is reduced in the same manner.

The index numbers .1, .2, .3, .4 and .5 are only for bookkeeping.

Example 2:

Here, using the stretched D`Alembert, the highest downswing is 23 units and the largest bet is only 3 units! This is quite a difference in comparison to the original D`Alembert.
Stretched d' Alembert bet 23 units

Below are both progressions combined for a direct comparison:
comparison table

In connection with a good bet selection, the Stretched D`Alembert surely is a good choice for the even-money player.

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About the author

Jennifer Lynn
Head of Content
Jennifer Lynn has spent 14 years working in the online casino industry, making her a real expert in the field. She's not just skilled at writing about casinos; she also has a deep interest in online gambling games and is a passionate researcher and player. Jennifer offers her expertise on a range of casino games and the smart strategies to use. But her life isn't all about gambling and casinos. She also loves riding horses and practicing yoga, showing that she knows how to balance her professional interests with personal passions.
Last Updated: Jul 03, 2024