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.