The Contra D’Alembert System

If you are looking for a betting system that minimizes potential losses and maximizes potential profits at the same time, the Contra D’Alembert is a system worth considering. Very simple to use, this system has long been popular with gamblers. It’s a positive progression betting system, which means your stakes are increased after a winning wager and reduced after a losing wager.

The Contra D’Alembert system is essentially the reverse of the Contra D’Alembert, which is a negative progression system. We provide a few basic details on that system below. Both these systems are best used for the same type of wagers, namely even money wagers in the casino. Technically they can be implemented on any even money wager, but roulette, craps, blackjack or baccarat are the best options.

On this page we explain the Contra D’Alembert in detail, covering exactly how it can be implemented. We also look at the advantages and disadvantages of using it.

The original D’Alembert was named after a French mathematician, Jean-Baptiste le Rond d’Alembert, who believed that a coin became more and more likely to land on heads the more often it landed on tails. This belief was incorrect but it was effectively the basis for the original D’Alembert system which, as a negative progression betting system, involves increasing stakes after a losing wager.

Interesting Fact
Jean-Baptiste le Rond d’Alembert’s mistaken belief was, and still is, held by many gamblers. In fact, it’s such a common misconception among gambler’s that it is commonly referred to as the gambler’s fallacy.

The theory behind the D’Alembert is that you are more likely to win following a losing wager, and can therefore make more on your winning wagers than you lose on your losing wagers by increasing your stakes when you do lose. This might seem logical, and indeed the system can work with the right sequence of results. However, it is ultimately flawed as a long sequence of losing wagers can get very expensive and cost you your bankroll. Even if you subsequently go on a long winning streak, you are very unlikely to recover your losses in full.

By contrast, a long losing streak using the Contra D’Alembert is likely to be relatively inexpensive. A long winning streak, on the other hand, can be very lucrative.

Implementing the Contra D’Alembert

The Contra D’Alembert is incredibly simple and very easy to use. As we have said, it should really be used for even money wagers such as those available at certain casino games. There are four rules to follow, and we’ve set these out below.

RULE 1 – Set a Base Stake
Before you begin with this system, you need to decide what your base staking unit is going to be. As a general rule, this should be somewhere between 2% and 5% of the amount you are prepared to lose on any given gambling session.
Every time you start with this system, your first wager should for one base unit. So if you settled on \$10, that’s how much you stake for your first wager.
RULE 3 – Stakes Increase after a Win
Every time you win a wager, your stake should increase by one base unit. So if you started with \$10, and then win, you should stake \$20 on your next wager. If you win again, it’s \$30 for the next one. This rule applies after every single wager.
RULE 4 – Stakes Decrease after a Loss
Every time you lose a wager, you should reduce your stake by one base unit. Continuing with the example above, if you lost the wager of \$30 then you would stake \$20 on the next one. If you lose a wager of one single base unit, the stake stays the same for the next wager.

That is really all there is to it. There’s no advanced math involved, and no complicated sequence to remember. It’s just a simple matter of following the very simple rules outlined above. This simplicity explains the appeal of the Contra D’Alembert, in part at least.

Pros & Cons of the Contra D’Alembert

There are both advantages and disadvantages to using the Contra D’Alembert. We’ve already referred to one advantage, that is not at all complicated and therefore very easy to keep track of what your stakes should be. It’s also a great way to protect your bankroll, as you are not increasing your stakes when you lose. Even if you lose the first ten wagers using this system you will only lose ten units. This compares very favorably to the Martingale system, for example, where you would lose 511 units if you lost ten wagers in a row.

Not only does this system help you lose quite slowly when luck is against you, it also helps you to win big if you go on a long winning streak. By increasing your stakes each time you win, you’ll be winning bigger and bigger sums of money when things are going in your favor. Of course, you have to accept that the chances of this happening are always against in you in the casino because of the house edge. Winning streaks do happen though, and this system does help to take full advantage of them when they do.

One of the bigger problems with this system is that you can lose money if you are winning roughly the same amount of wagers as you are losing. For example, if you went on a sequence of win, lose, win, lose, win, lose then you would be behind. Even though you have won three wagers and lost three wagers, each winning wager of one unit would be followed by a losing wager of two units.

With certain sequences you can even lose money when you win more wagers than you lose. Let’s look at example when playing roulette. We’ll assume you’re betting on black each time, and that your base stake is \$10.

• Wager \$10, win. Increase stake to \$20.
• Wager \$20, win. Increase stake to \$30.
• Wager \$30, lose. Decrease stake to \$20.
• Wager \$20, win. Increase stake to \$30.
• Wager \$30, lose. Decrease stake to \$20.
• Wager \$20, win. Increase stake to \$30.
• Wager \$30, lose.

Here you have won four of your bets and only lost three. However, the total won from your winning bets is \$70 but the total lost for your losing bets is \$90. This gives an overall loss of \$20 despite actually winning more bets.

So, although this system can maximize your winnings in some circumstances, in other circumstances it can actually make you lose more than you would if you were just betting the same amount each time.

Should You Use This System?

Because of the drawbacks of this system we wouldn’t go so far as to say we recommend it. We don’t recommend any betting system in fact, as none of them increase your chances of winning. They can be fun though, if you’re sensible with them, so we don’t advise completely ignoring these systems either. And the Contra D’Alembert does have some benefits. It can help you to manage your bankroll if you follow the rules without deviation, as you won’t go chasing losses when on a bad streak. You do still need to be disciplined though.

One piece of advice we would offer if you are going to use this system is to set a maximum stake. If you win enough hands to get to that maximum stake then you should stop and start again, or at least significantly reduce your stakes. This way you can ensure that you won’t start giving back too much of what you have won if you are lucky enough to go on a decent winning streak.

Other Positive Progression Systems