A martingale is a technique giving the illusion of increasing the chances of winning in gambling while respecting the rules. The principle depends completely on the type of game that is the target and, in many cases, the rules are intended to prevent the possibility of a martingale. Nevertheless, the term is accompanied by an aura of mystery that some players would know the secret techniques to cheat the chance and, for example, beat the bank in casinos. To do this, a martingale must change the expectation is such that, in the long term, the chances of winning are lower than those of losing. It is therefore to increase the chances of winning and, ideally, they are superior to those of losing.