Fibonacci. Stake follows 1, 1, 2, 3, 5, 8, 13, 21 units. Move two steps back on a win, one step forward on a loss. With a $5 unit: $5, $5, $10, $15, $25, $40, $65, $105. Slower than Martingale, faster than D'Alembert, and, critically, it does not fully recover accumulated losses on a single win. That surprises people who assume it does.
Expected value: unchanged again. I could keep listing systems here, but the punchline never moves.
Risk parameters to set before you start, for any roulette strategy:
- Base unit as a stated percentage of session bankroll, with 1% or less a defensible ceiling.
- Maximum progression steps, computed as table maximum divided by base unit.
- Stop-loss in dollars, set before the first spin.
- Stop-profit in dollars, honoured as strictly as the stop-loss.
- A hard session time limit, set on a timer outside the game.