If you win, you must place a wager in accordance with the second number on the left. There are a quantity of different double-down roulette strategies, though all of them work in the same way. These strategies recommend that you simply double your earlier wager if you lose and reset your guess when you win. The Martingale System is the most popular example, and we’ll explain the way it works within the next section of this information. Instead of betting on both all black or pink numbers, you can also guess on all odd and even, or high or low numbers. The odds of profitable any one of these bets on a European desk is 48.6%.