To make the math easy, the ratio of bankroll to winning goal should be one less than some power of 2.The great the ratio of bankroll to winning goal, the greater your chances of a session success are. Start by deciding what your winning goal is and your bankroll size.The Martingale is generally played on even money bets.The following are the rules of the Martingale. However, everybody has a finite supply of money and eventually the Martingale will take down even the biggest of bankrolls. The siren's call of the Martingale has fooled many gamblers as it usually results in a session win. There can be little debate that the Martingale is one of the oldest and most popular betting systems.