6+ Roulette System

6+ Roulette System. A well-known betting system in roulette is the Martingale system. It varies greatly. You should follow such principle: if you win, then pocket your bet. If you lose, you should double your previous bet. By doing this in case you win, you get back your previous loss and one more unit. And so on.
The Martingale System is effective only if you have an infinite bankroll and no betting limits.
Another popular roulette system is the d'Alembert system. The system is based on the assumption that after a win you are less likely to win again. So after a win, you subtract a chip from your bet. The d'Alembert system also assumes that you are less likely to lose after a losing spin, so in that case, you add a chip to your bet. The fact that the roulette wheel has no memory and each spin is an independent trial with exactly the same odds of a win or loss is the previous spin is a weak point of the system.