The system is meant to be played on even money bets where opposite betting is allowed.However, one person could do bet both sides, although he would look like a fool betting opposites. For this reason, it is meant to be played with a two-person team. Like all betting systems, not only doesn't it overcome the house edge, it doesn't even dent it. Much like the Martingale, you can expect it to usually win small, but lose it all back and more when you reach the maximum number of losses. It basically a modified nine-step Martingale. The Keefer Roulette System is a betting system promoted in a book by the same name.