The Martingale
Double your bet after every loss. In theory, one win recovers everything. In practice, table limits and your bankroll cap the doubling — and a six-loss streak (which happens often) wipes out hours of profit.
The Fibonacci
Bet according to the Fibonacci sequence (1, 1, 2, 3, 5, 8…). Slower than Martingale but still loses to the green zero in the long run.
The D'Alembert
Increase one unit after a loss, decrease one after a win. Lower variance, but the house edge is unchanged.
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The hard truth
No betting system can overcome roulette's built-in house edge — 2.7% on European, 5.26% on American. Systems change how your wins and losses are distributed, not the long-term outcome.
What actually helps
Always play European or French roulette (single zero). French with La Partage drops the edge to 1.35% on even-money bets. That single rule choice is worth more than any betting system.