Here's my penthouse method for double dozens. Always play until you are at least +1 or more.
Start by writing down your first bet: 1 1
If you win, +1. Put it in profits.
If you lose, you move up one level : 1 1 2 2
If you win you cross circle the 2 ...
Start by writing down your first bet: 1 1
If you win, +1. Put it in profits.
If you lose, you move up one level : 1 1 2 2
If you win you cross circle the 2 ...