This is another system for betting at an (approximate) 50/50 chance of winning, like black/red in roulette
. It is very related to the Labouchere System
, and is in principle the same system in reverse, hence the name.
In the simplest form, you write down some numbers. For example: 1 2 3 4 5
The bet is the first and last of these numbers. In this case it is 1 and 5, which is 6. If you win, you add the 6 to the end of this sequence. If the bet loses, then you cross out the first and last number of the sequence.
You should set a target for winnings, say 20, and when you reach the target, you start over with a new (or the same sequence).