Winning at roulette is possible as long as you use systems …
A system is neither more nor less than an indication of how to place bets with the advantage for the player that has been previously analyzed in a large number of plays (permanences).
There are many ways to play (systems) and the most effective are those that show higher gains in studies of permanence.
It should be clear that the purpose of the systems is to obtain more cycles won than lost -as it is impossible to win forever-, so that after calculating the final results, the balance is positive.
Whatever the level of the player, professional or just for fun, you must use strategies to not be at a disadvantage with the bank and to win.