Anytime you are playing against the house as in Blackjack, roulette, etc., you will lose if you play long enough. The odds are what they are and systems, i.e Martingale, split martingale, double martingale or whatever you chose to call your particular betting progression do not change the odds of winning. The only betting game where odds do not apply in this sense is Poker and I prefer the "Texas Hold'em" variety. However in poker you had better be a 'hard read' and a 'good reader' and if you don't understand those terms, don't play, you'll save a lot of money