The Martingale is a centuries-old system that encourages players to double their betting amounts every time they lose on an even money bet, i.e., half the numbers on the board or red/black. It is believed that if they are doubling their stake after every consecutive loss, they will eventually recoup their losses on a bet that they finally win -- almost like the opposite of a hot streak as it were. The problem with this system is that a player can end up depleting their bankroll very quickly, and there is no scientific or concrete evidence to back up that it actually works. Plus, each outcome is independent of the previous result in online roulette, meaning there are no recurring patterns.