My strategy is to play at 49.50% win place bets.If win I don't make any change but if lose I just double my next bet. I make base of 11 before starting. This strategy works for me 99% because nothing is 100% in gambling.
Basic martingale..you will be busted for long run.
But if you say that it is working 99% for you, means that you're a wise gambler. You know when to stop before busted..
Possibly he's new to gambling with martingale