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Jean Le Rond d'Alembert was a French mathematician who came up with a theory of equilibrium that can be put to use on the so called even money bets (odd/even etc).

According to d'Alembert, if you have two outcomes with an equal chance of occuring (eg odd/even in roulette), and the outcomes begin to skew one way (the roulette ball keeps landing in even pockets for example), then the other outcomes ought to skew to the other side at some stage, in order for the natural balance to be restored.

So in a nutshell, if the ball keep landing in a even numbered pocket, switch your bets to theodd numbers, but do it according to a pre determined system.

A ggod way to track using the d'Alembert is to add a unit to your last bet if you lose and remove a unit if you win, the last losing bet is more likely to win under this theoy.

The d'Alembert tends to be used on 50/50 or even money bets over a whole session- so say you make a hundred wagers at the roulette table and you are betting on red/black, you are taking a punt that 50 red and 50 blacks will show.

WARNING: obviously this may not happen, even over a hundred bets. You might experience a sequence of reds at the start of play and then discover that the remainder of the session goes with odd. Remember, mathematically speaking anyway, each roulette spin is a mutually exclusive event- the wheel has no history. Try this out on a free account for a no risk trial before you commit any money. See how you go. Also bear in mind that on most roulette wheels, there is a zero pocket (or even two in American roulette). This is going to reduce your odds below even money (this is where the casino makes its money- this is their house edge). theonly sure fire way of improving your odds is to stick to European Roulette and avoid American Roulette.

Play EXAMPLE: you place a £5 wager on even and your bet loses, so you double your next bet to £10 even. If you come up trumps, reduce to £5 and switch to red. By progressing your stake along a Martingale when you lose, the idea is to claw back your loss and make profit. But careful! Remeber that the table has a maximum betting limit that limits your ability to cover your losses. And if you suffer a big string of knocks, you will be betting relatively big numbers to win single digit profits.

Test out the D'Alembert at 888

For this system to work you would need an even spread of the even odds bets, i.e. no long runs of either even or odds bet.

And then of course you have the pesky 0 pocket! This means that your odds on so called "even" money bets are actually less than 50/50.

As with all roulette systems, we advise small tests to see how your luck runs with them. Be aware of the limitations of the system (knowledge is power!) and understand the maths behind the idea (ie the probabilities). This system is not a sure way of beating the roulette table, but it will give you a system to play with and enable you to at least play methodically.

Again, the problem with this system is that a sequence of losing bets will sink you into a hole from which it will be difficult to crawl out of.