Fibonacci
Fibonacci numbers is a system very similar to the Martingale. difference in the steps which increase this bet at a loss: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89 ... etc. In loss goes a step up. When profit returns two steps down. Play events with coefficients> = 2. The system is rather non-aggressive by Martingale.