Charles Wells might not have had the best reputation but he was good at roulette. One evening in 1891, Charles went to the world-famous Monte Carlo Casino Resort and started playing roulette enjoying a winning streak of a lifetime (winning 23 out of 30 consecutive spins).
In roulette, the best odds are generally associated with the even money bets, such as red or black, odd or even, and high or low. These bets have the highest probability of winning, at nearly 50%, and offer a 1:1 payout.
The Martingale Strategy is arguably the best roulette strategy, and it's certainly one of the most famous ones. Simply put, you don't hold back when you lose; you do the opposite. Whenever you lose in roulette, the Martingale Strategy requires you to make your bet bigger than the previous one.
Outside bets in roulette carry the lowest risk. They cover more numbers yet the payouts are lower (1/1 for Red, Black, Odd, Even, 1 18, 19 36). These outside bets carry the best prospects for long-term wins.