The double up system is the easiest roulette system there is.
Every time you lose you just double your bet, if you win you start over.
On the surface this seems like a sure winner, but it is not. You will lose with this system.
After all, what are the chances of not hitting the right color 10 times in a row.
The chances are big. The reason for this is because when you play this system you are betting so many times that the math eventually catches up with you.
When it does you loose all your money. The chances of hitting the wrong color 10 times in a row is 1 to 1000. That might seem like a lot, but with the number of times you are placing bets, hitting 1000 will take no time. If you start of betting $1 your 11th bet will be more than $1000.