i have a system based in statistics, not always work but is helpful...
every time that you make a bet and you lost, then you have to double your bet
...
-snip-
The martingale strategy is pretty bad. Think about what happens when you get to a high losing streak. Wagering hundreds to profit only $1? Pfft.
(Though statistically it's no better or worse than any other strategy ever)
The martingale strategy is nothing new, and though some may think that it works out for them, you'll find that eventually you'll approach the point where your balance tips towards 0.
I prefer high bet amounts, going all-in on one bet. Occasionally, when I want the gambling to last for a longer time, I will bet smaller amounts on sports bets.