inner page top left

Differential Betting System Explained

Differential Betting System


The world of roulette betting systems is vast, with various strategies designed to optimize your chances of winning. One such intriguing method is the Differential Betting Strategy, which is a modification of the Contra D’Alembert Progression. This strategy is unique in that it doesn’t focus on bet selection or progression in isolation. Instead, it aims to capitalize on the laws of deviation and balance that govern even money chances. In this article, we’ll delve into the intricacies of this strategy, how it differs from its parent system, and how it can be applied to different roulette scenarios.

With A Modification Of The Contre D`Alembert Progression Systems using flat bets generally contain long-lasting stagnation phases, which make a strategic play uneconomic: expenditure of time and the yield are in no profitable relation to each other.

Based on this realization and the fact that even money chances are ruled by both the law of deviation (ECART) and the law of balance (EQUILIBRIUM), it is quite possible to utilize the strategy of differential betting.

Differential betting strategy is not a bet selection or a progression, because it can be used only if two chances are attacked at the same time.

Differential betting can never be accomplished with flat bets since all bets would be zero!

Differential betting is only possible if two chances (for example RED / BLACK) are followed with a progression. Here for each chance, the respective progression bet size is determined separately, however, only the difference is wagered.

The Contra D’Alembert Progression System

The original D’Alembert Progression system is a negative or “up as you lose” progression. Starting always with a bet size of 1 unit, the bets are raised after each loss by 1 unit and lowered by 1 unit after a win.

The Contra D’Alembert Progression is a reverse of the original or “up as you win” progression.

The first bet of the progression is also 1 unit. After a win, the bet is raised by 1 unit and after a loss, the bet is lowered by 1 unit.

In the following example, we bet for ease of demonstration on EVEN numbers:
Differential easy betting

Using the Contra D’Alembert progression the spin run above would produce a total loss of 7 units within 14 spins.

In permanence sections where the deviation dominates, the Contra D’Alembert produces gains very fast, but the progression loses 1/2 unit per placed bet if the permanence balances itself out.

The same spin run using differential betting:
· EU: units on EVEN
· BE: balance EVEN
· OU: units on ODD
· BO: balance ODD
· TB: total balance
Differential Betting same spin

The result of -4 is slightly better than the first result, however, is not very satisfying.
Using a modification after a lost bet shows better results.
The modification is simply to reset to a bet size of 1 unit after a loss. See the next table:
Differential Betting modification

The spin run is balanced (7 even numbers and 7 odd numbers). The result is neutral.

Now let us take a look at a spin run with a stronger deviation towards one chance.

Here we use the chances BLACK and RED:
Differential use black or red

Since we do not know on which chance the deviation will occur, differential betting is obviously a good strategy to achieve gains be it a deviation towards BLACK or be it a deviation towards RED. The BLACK side loses 19 units and the RED side wins 29 units. Net gain of 10 units with the highest downswing of 5 units if you look at the Total balance. Seems to be not too dangerous.

Almost every progression (negative or positive) is usable for differential betting. Other roulette strategies you may use are the Fractional Betting system, Garcia system or The Guetting Progression system.


Differential betting offers a nuanced approach to roulette, allowing players to capitalize on both deviation and balance in even money chances. By using the Contra D’Alembert Progression as a base, this strategy provides a dynamic way to manage your bets, making it adaptable to various game scenarios. Whether the game leans towards BLACK or RED, or EVEN or ODD, differential betting can be a useful tool in your roulette strategy toolkit. While it may not guarantee wins, it does offer a more balanced risk profile, especially when used in conjunction with other systems like the Fractional Betting system, Garcia system, or The Guetting Progression system. As always, remember to gamble responsibly and understand that no strategy can overcome the house edge entirely.

inner page bot left

About the author

Richard Grant
Richard has from an early age been interested in casinos and the thrill of playing casino games. After finishing his degree in Law and business he started this platform in 2007 as a complete resource to online gaming with the primary objective of reducing the house edge for players. Specializing in game guides, reviews, and strategic insights, Richard is devoted to helping you hit the jackpot.
Full Screen +