The Martingale – This is the most common system that players use. All you do is bet on a colour and then when you lose, you double your next bet. You repeat this process over and over until you get a win. Once you get a win, your overall profit will be whatever bet you started out with. This is one of the riskiest roulette strategies that you can use. Side note – this is a system that can be used all over the roulette table, not just red and black. It is red and black where it is most commonly used though.
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Reverse Fibonacci – This is the opposite to the strategy above. As with all “reverse” systems, you need to go on am extended winning run to get a profit.
Oscar’s Grind – This is a very similar system to the D’Alembert. You increase your bets after a win and keep them the same after a loss. A slow system that attempts to grind out wins, hence the name.