There were, though, some people over the history who have managed to trick the roulette. Gonzalo Garcia-Pelayo believed that casino roulette wheels were not perfectly random, because the wheels were not balanced or aligned, and therefore certain numbers were more likely to occur next than the 1-in-36 odds. To prevent this, the casinos now monitor the wheels regularly.
Edward O. Thorp and Claude Shannon built a wearable computer to predict the landing of the ball. It was working by timing the ball and the wheel spin, and calculating the most likely octant where the ball would fall. However, this method could be easily countered by closing the table for betting prior to the spin.
The Martingale betting strategy is widely used, but not always efficient. It states that one should double the bet after a loss, so that the first win should cover all the loss, and also win an amount of money equal to the original bet. But nobody can guarantee that you don’t spend all your money before that big win, or that you don’t hit the table limit.
In real life, every spin is totally random and independent one to another, which means that there is no previous spin history. With no historical data, mathematical formulas are useless.
The best thing a player can do is to wager on bets having the lowest casino advantage.
To start with, play the European version, because it has 37 slots (with one 0),where the house advantage is 2.7%, instead of the American version, which has 38 slots ( with a 0 and a 00), where the house advantage is 5.26%.
The best chance to win something is to bet on black, red, odd, even, low (numbers 1 through 18), or high (numbers 19 through 36). These bets pay out odds of 1 : 1. Betting on single numbers brings you a bigger win, in case you are lucky, but also greatly decreases your odds of winning.