The cancellation system is something of a middle ground between the Martingale and the D’Alembert systems. Like the Martingale you can quickly find yourself needing to make a very large bet to stay in with a chance. But like the D’Alembert, it seeks to limit the loses and maintain some level of control over the downward spiral of increasing bets.
How it works
At the start of a betting session you decide how many even money units you would like to try and win. You should also decide how much you are willing to lose. That way, if you reach that limit you can just stop and walk away. For the sake of example, let’s say you would like to win 5 ‘units’ and are willing to lose 15.
You start by writing each unit on a piece of paper like so: 1 1 1 1 1. Each bet you make should be the total of the units at the far left and far right. In this case, that’s 1 and 1, so we bet 2. Let’s say we won. In that case we cross off both numbers, so we now have: 1 1 1. So again we bet the total of the left and right (still 1 and 1), and we win again. Cross off the numbers, and we are left with only 1. We now bet that single unit, and if we win we have achieved our goal of winning 5 units.