Martingale system is invented by casinos. This wagering system is based on doubling your stake after each loser bet and turning back to the first step after each winning bet.
For instance, you staked 10$ on a %50 chance bet with 2.00 odds. If you lose the bet, you place X2 of your previous stake. You lose the 2nd bet too? So, you go on doubling your stakes until you win a bet.
Martingale strategy example
STEP 1 1st Bet - Stake 10$ = Lost
STEP 2 2nd Bet - Stake 20$ = Lost
STEP 3 3rd Bet - Stake 40$ = Lost
STEP 4 4th Bet - Stake 80$ = Lost
STEP 5 5th Bet - Stake 160$ = WON (So, we go back to the first step = 10$)
STEP 1 6th Bet - Stake 10$ = WON (We won again. It means we go on with the first step)
STEP 1 7th Bet - Stake 10$ Lost (We jump on Step 2 for next bet
STEP 2 and so on.
As you can see above, we won the 5th Bet and our profit will be 160$-(10+20+40+80)$ = 10$. It is the rule of Martingale strategy. You get the same profit after any win anywhere. We won the 6th Bet too. Our profit is 10$ again after this winner bet. If we cannot win until 7th Bet, our total wager will be 1270$ (10$+20$+40$+80$+160$+320$+640$). Losing 7 in a row is not impossible and I am sure it can happen to even very best punters in the long term.
I want to tell you a story about me about this subject. 3 years ago, a friend of me came and sat next to me in a cafe and told me that we should have to talk immediately. He was so excited that I could not resist his offer even if there were 2 girls next to me. We got out the cafe and he began to tell me his fantastic strategy which was supposed to be invented by him(!).
It was surely Martingale; furthermore, my friend was extremely sure that he had found it first. We found a net cafe and I showed his so-called strategy was invented by someone else before. I mean Martingale strategy is not an essential and marvellous wagering strategy. Any of school children can invent it on his/her own.
Conclusion - Why to avoid Martingale
Nevertheless, a lot of punters use this strategy or something based on this as their premier wagering strategy. Maybe they don't know how it is dangerous. We never suggest our members use this system. This is absolutely non-sense and any bookmaker is absolutely happy when his members use this. In the long term, there is no possibility to win by using Martingale.
Bookmakers have their wager limits and they will not let you wager more than limits or you will bankrupt without a final winner bet.