yes its true and we can count on with our strategy if we don't have a good luck in gambling games and if we see this, its better for us to leave the gambling site soon because we are risk our money in that games. but if we have a strategy even its only simple strategy but we have a high chance of luck then the possibility for winning the games is wide open and we can win with easy and of course we can get big money.

If you are lucky you will win, if you are not you wont

Martingale on roulette has been my biggest weapon but even with that I have my limits and if I reach that limit I quit and accept my fate as a loss for the day. What I do is to double up my money anytime I lose a bet, I will keep doubling until I win to recover all my list bet and I do bet on the colors of the roulette whether black or red category. I once lost an equivalent of 230$ and that had been my biggest lost  so far.