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The D'Alembert Roulette System

 D'Alembert Roulette

The D'Alembert System might be the first betting system ever devised specifically with roulette in mind.

Shortly after roulette wheels began popping up all over Western Europe, a mathematician named Jean le Rond D'Alembert sat down at his local gambling den and tried to come up with a winning strategy to beat the game once and for all.

What D'Alembert came up with was a simple negative-progression betting pattern that didn't require advanced calculations or record keeping. And because of its simple nature, the system that bears the Frenchman's name has remained popular to this day.

How Does the D'Alembert System Work?

The D'Alembert system is not difficult to use, but there is one guideline that you must follow: stick to the Even-Money bets. These are any bets that pay put 1:1 and they make up the majority of the outside roulette bets. More specifically, they are:

Make one of the above bets with what you would consider an 'intermediate' sized wager. If it wins, you make the same type of bet with a smaller wager. If this first bet loses, then you redo it with a larger wager. You then repeat the same pattern with your second bet and all future bets. If you win, lower the wagers; if you lose, make bigger wagers.

It's so important to stick to Even-Money bets using this system. If you tried to use straight-up bets instead, you wouldn't be able to take advantage of the system's workings, and you'd probably just lose a lot of money.

To illustrate the betting a little better, take a look at this example:

Size of Bet Win/Loss Next Bet is... Net Profit
$25 Win Smaller $25
$20 Loss Larger $5
$25 Win Smaller $35
$20 Loss Larger $10

I can't stress how important it is to use even money wagers with this system. If you tried to use straight up bets instead, you wouldn't be able to take advantage of this system, and you'd probably just lose a lot of money.

The Logic Behind The D'Alembert

On a long enough timeline (for argument's sake, let's suggest infinity), each pocket on the roulette wheel will have seen the same number of hits as every other pocket. Because of this, it seems that if you were to win on Red two times in a row, getting it a third time is less likely.

Because you are adjusting your wager on a real-time basis, you can easily adjust your bets based on the entire sample set you've seen. After a long series of wagers, your bet sizing takes information from the whole series of results into account.

Does the D'Alembert System Really Work?

As with many ‘sure fire' betting systems, the short answer is ‘no'. Sure, you may get lucky and make a profit, but when you win with the D'Alembert, that's all it is - luck.

The logic above makes sense to many roulette players: it is called the ‘Gambler's Fallacy'.

The gambler's fallacy is the belief that past spins of the wheel (or rolls of the dice) can influence future spins. While this makes sense on the surface, you need to understand that each spin is an independent event. Even if you won on Red ten times in a row, Red is still as likely as Black to appear on the 11th.

There is another problem with the system: it employs the Even-Money bets because it's based on the idea that there are two equally possible outcomes. This is not true, sadly. American Roulette wheels have green 0 and 00 pockets that only benefit the house, and increase the chances of you losing if your Red/Black bet doesn't come in.