Players who have played at online casinos long enough would have heard of the Martingale system. This system is used in several games of chance and is based on the belief that the winning round is not far away.
This system works only with even money bets and rules that every lost bet must be doubled in the next bet until the game is finally won.
If a player loses a pass line bet of $10, the next bet should be a pass line bet of $20, which is double of the previous bet and if this round is lost, the next round will bet will be $40.

Mathematically, this system does make sense as the number has to come at some time or the other and the player gets back the lost bets. In spite of being mathematically perfect, the system has not proved to be very reliable.

There are several reasons for this. One is that the player needs to have a hefty bankroll if there are several lost bets and the other is that the casinos set table maximum limits beyond which players cannot bet. If the player does not win even after the maximum limit is reached, all the bet money is gone, and since the money keeps doubling, it is usually a large amount.

Although, several people continue using this system on craps and other casino games, it hasn’t really been a hit because of the practical issues associated with it, and not because the system does not work.