Another of these methods that refuse to die is the [something like this](https://grosvenorapp-uk.com/) Labouchére System. With it, you write down a series of 7 or 8 numbers. You add the front and back numbers together and that is the amount of your bet. If you win, cross off the first and last numbers and bet the amount of the new first and last numbers. If you lose the initial bet, add the amount you lost to the end of the series as the new last number. Your next bet is the total of that number plus the first number. The idea is to cross off all of the numbers at which time you will show a profit. It is complicated, annoying, and worst of all will quickly do violence to your bankroll. If you can bet 30 numbers with 5 double streets and win them all 38 times you might be onto something. At $10 per street, you'd win $10 per spin, and win $380 in one round. Then you need to adjust your streets to figure out which new numbers won't hit in the next 38 spins.link to original post