The casino controls where the ball lands in roulette, but it is not completely controllable. Roulette wheels have a number of pockets or “pots” that can be filled based on the numbers that come up. The house edge on roulette is about 0.5%, meaning that for every 100 spins, the casino will earn 50 cents.
However, because the wheel can only spin one time before stopping, the casino cannot make sure that every spin will result in a payout. This means that sometimes the wheel will place the ball in a pot that is less likely to win than other pots, leading to a loss for the player. Additionally, if the player bets on red and black numbers (the two most common bets), then their chances of winning are about even, no matter where the ball lands on the wheel.
