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The Martingales systemThe basic Martingale applies to even money outside bets. The basic principle it the amount of the intial bet is doubled after each loss and each win is covered by future bets of the initial amount of money until a loss occurs.The risk is losing everything and table limits prevent the doubling of losses.
The Grand Martingale The grand martingale is the same theory but one unit is added after each play so 10 ,20 ,40 in the martingale system would be 10 , 21 , 43 in the grand martingale system.
Reverse Martingale The reverse martingale capitalizes on winning streaks. Bets are doubled after each win.
D'Alembert system This system is based on even money outside bets and the system is simple : after each loss one unit is added to the next bet and after each win , one unit is deducted from the next bet.So if you bet 10 and lose , the next bet is 11 and if you win while betting 10 the next unit is 9. This system is favored in Europe because of the single zero wheel.
Reverse D'alembert Like the reverse martingale the reverse D'alembert builds on wins. Add one unit to the winning amount and subtract one unit from the losing amount.
Inside Bet Systems Inside bet systems are based on the theory that a number should come out in due time.So if a number hasn't appeared in 100 spins it's due to come out.This system isn't a good one since a biased wheel could unduly influence the outcome .