It's not.
The house edge guarantees that the casino will win in the long run and there's no strategy that increase your chance.


Assume that the win chance in a single bet is 49% and the lose chance is 51%. You get back to the base amount every time you win and double the bet amount every time you lose. You have a big balance and you can continue wagering until you have 20 consecutive loses.

Every time you wager, the chance of having 20 consecutive loses is only 0.00014%.
You may think that's very good. Right? But the more you play, the more chance you have to hit 20 consecutive loses.

The chance of winning 1000 times without having 20 consecutive loses would be 99.86%.
The chance of winning 100,000 times without having 20 consecutive loses would 86.79%
The chance of winning 1,000,000 times without having 20 consecutive loses would be 24.24%