Here is my seven step parlay that I wrote supporting software for at my own forum/school. Here is the seven step progression: You have a 61% or 64% chance to win the first bet. (37 or 38 numbers) 24 24 on a win the next bet is a free shot 24 / 2 = (12 & 12) 12 12 take off 0 on a win, taken so far = 0 18 18 take off 6 on a win, taken so far = 6 24 24 take off 12 on a win, taken so far = 18 30 30 take off 18 on a win, taken so far = 36 36 36 take off 48 on a win, taken so far = 84 30 30 take off 90 on a win and keep it all. Taken at the end = 174 This is a double dozen, 24 numbers, bet method. It is recommended to target 'when' to make those bets, consecutive or not. It would be best to use a most unlikely to happen sequence as a triggering indicator. It is my opinion that unlikely to occur sequences are the way to create a winning system as TG is alluding too. The progression can't make you money consistently, with no regard to when it would be the best time to use it.