System "multiply by 3"

The system I like most is with the "multiply by 3". It is based to almost sure matches and very cloise to all known systems, but with better success.
First you should choose a match with coeficient nearly 2,00. I think that some kind of matches are very sure, and you should have a success of more than 60-70%. This means that on every 10 matches you will catch no less than 6. So, this brings to us the idea that you bad series is no more than 4 matches. ON first sight you will think that this system cost a lot of money, but in fact it requires only a good knowledge over the matches.
The system requires one match with coeficient of 2,00. You bet 10 US Dollars for example. If you catch the first match you will get 10 US Dollars profit and if you lose, you will bet 3*10=30 US Dollars. If youi catch the second match with will get a profit of 20 US Dollars. If you lose continue with the simple scheme. In fact this scheme is good, and will give to you good profits with big investment.