In essence, the Martingale system requires you to double the previous stock for any losing bets you make. For example, let's assume your first bet on the blackjack table is $ 5 and you lose your hand. At this point your next bet will need to be $ 10.
This sequence basically continues until you win the hand, so if your second bet is lost you will need to stock $ 20 in third hand and so on and so on. Basically, it's the power of your strategy to keep doubling your bet every time you lose with that prospect when you finally win the hand.
Once you do win a math hand from a system dictate that you will show the advantages of one unit. In basic terms, a unit is defined as your initial stock size. So, in this example, after losing three hands in a row, players will need to stock $ 40 in their fourth hand, taking their overall exposure to $ 75. After winning this hand the player receives $ 80 that will leave them with a $ profit 5
You do not play the martingale system in BlackJack, haha.. Are you high?
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The whole idea behind martingale is to use it in games that are (basically) 50/50, and that is why it works. Roulette is a great example, 50/50 on Dice is another.