The Martingale system is the most popular and frequently used roulette system. The idea behind the guide is quite simple - you increase your bets after you lose, so if you win later, you get your losses back. . After this, you start betting the first coin.One of the characteristics of both 0 and 00 roulette games - the standard format in the United States - is that five -number bets on 0, 00, 1, 2 and 3 have a higher edge. the house than other wagers. If you make that five-digit bet, the house edge is 7.89 percent. In all other respects, it is 5.26 percent.