D’Alembert Strategy Steps: Like the previous roulette strategies, place a small starting wager on black or red; even or odd; or 1-18 or 19-36. Increase your wager by one after a loss, and decrease it by one after a win. Walk away when you’ve had at least as many wins as losses. If you’re on a losing streak, stick tight until the winning picks up and equals your losses. If you’re riding high on a winning streak, continue playing until your wins equal your total losses. When you have an equal number of wins and losses, pick up your winnings and walk away. If you come out even on total number of wins and losses, using the D’Alembert Strategy will put you in the black. Here’s an example: say you put down a bet of $10 on red. You lose, so you bet $11 on red again. You lose again, so your wager goes up to $12. You win, so you go back down to $11 and win again. You pick up your winnings and walk away. You lost two wagers and won two wagers, so the math comes out like this: – 10 – 11 + 12 + 11 = +2. The disadvantage to this strategy is simply keeping track of your number of wins and losses.(資料來源)