Martingale
Martingale is one of the most popular. In its basic principle is that after every losing bet amount is doubled. For example, if we start with the bet of 1, 2, 4, 16, 32, etc. If our bet is winning it again starting from 1. Gambling is always a factor of> = 2. The assumption behind this strategy is that winning bet at any moment to come will compensate for the loss until bets. There are a huge number of varieties behind this system.