The intent of a progressive betting system is to vary the size of your bets in a predetermined manner, according to whether or not you won the previous bet. Many recreational players use them when they play blackjack. I’ll focus on one of the most famous and widely used progressive betting systems—the Martingale, or double-up, system.
Using the Martingale betting system, you double your previous bet after every loss until you finally win a hand, at which point you will be ahead by one betting unit. For example, suppose you wager $10 and the results of the next three hands are loss, loss, and win (L-L-W). You would have lost $10 on the first hand, $20 on the second hand, and won $40 on the third hand. You wind up with a net win of $10, which is the goal of the progression, to win an amount equal to your starting wager.