There are many people that claim to have found the perfect system with which to play and win at roulette. These people have written books, they have built websites and they sell their systems to a wide variety of people who fall under the lure of easy money from the roulette wheel.
However, the fact of the matter is that there are no real systems or secrets to win at roulette, and there are several reasons for this. Firstly, any system is liable to be based on probability, and roulette is never a game of probability. The roulette wheel has no memory and in way does a turn of the wheel reflect any previous turns. Thus in way can you predict what the next turn of the roulette wheel will be.
For example, a good example for the arbitrariness of the roulette wheel is to flip a coin. If you flip a coin nine times. What is the probability of each side coming up? The probability is fifty per cent. However, if after nine times it come up tails. What are the chances of it coming up tails again? Still fifty per cent. So it is with the roulette wheel. There is no way to predict what the result will be in any turn of the wheel, and in roulette is is always a chance of 1/36 of it coming out anything. In roulette there is no probability.