By doubling bets after each win, one retains betting every little thing they have gained till they both stop taking half in, or lose all of it. These schemes work by figuring out that the ball is extra prone to fall at certain numbers. If efficient, they increase the return of the game above 100 percent, defeating the betting system drawback. The maximum quantity allowed to be wagered on a single bet in European roulette is predicated on a progressive betting mannequin.