It has a built-in mechanism in such a way that when you lose a bet, you are one step backwards, but when you win a bet, you are three steps ahead towards your goal of winning the session. The session can be as short as one bet, and as long as 25 bets. The nice thing about it is that it always ends at your benefit, accumulating 3 units every time it ends. So, this is not a get rich quickly scheme, but a solid system that gives you 3 unit profit, session after session, as consistently as ever can be. I will give you the opportunity to even test the system before you buy it to be fully convinced.
L is the number of the losing bets.
You bet for a repeat color, on the last decision. If the last color was a Black, bet on Black. If it was a Red, bet on Red. If you were to do this, count the number of times you win and the number of times you lose and apply the formula. If the number of your winning bets equals the number of your losing bets plus three divided by 3, then the system will work for you.