If you want a 100% way to win money staking this is all you do.
Start with 1m, if you loose double it. 2m, lose double it, 4m, lose double it.
You keep doubling your bets, you can't lose forever. I use it in the casinos on blackjack, throw 10 on black, lose double it. You win 100% of the time if you have the money to support it.
Yes you can lose 20 times in a row, but if you have the money to stake it doesn't matter. You will make money.
Also the chances of losing 20x in a row is that unlikely it's not funny.
I have done this method before and currently do it in 07. I've never not walked away with more money, there are times where it has been close... But never lost