A martingale is any of a class of betting strategies that originated from and were popular in 18th century France. The simplest of these strategies was designed for a game in which the gambler wins the stake if a coin comes up heads and loses it if the coin comes up tails. The Martingale system is a system of investing in which the dollar value of investments continually increases after losses, or the position size increases with a lowering portfolio size. The. The Martingale system is the most famous of roulette strategies. But is the method really so successful? Read here for the pros and cons. +18. T&C apply. The Martingale system is the most popular and commonly used roulette strategy. The concept behind it is pretty simple – you increase your bet after every loss, so when you eventually win, you get your lost money back and start betting with the initial amount again. It seems quite logical, and it’s fairly easy to understand and implement. The Martingale system is primarily used at casino games which offer even money bets. The outside bets on the roulette table, such as odd or even, are good examples of where players will try this system. The Martingale betting system increases your chances of winning in the short term. The catch is that when you do lose, you lose big. The Martingale system is one of the most commonly used betting strategies for traditional Casino table games, as well as sports betting. Betting strategies have long been popular among recreational.