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).

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