Contra Bet Roulette Strategy

Rule and boundary

Use an outside even-money betbetEven-money betRed/black, odd/even, high/low. 18 numbers, pays 1:1.Read full → with an increment no greater than 1% of bankrollmoneyBankrollThe total amount set aside for play. Bankroll management is deciding how much of it to risk per bet and per session.Read full →: increase by one increment after a win and decrease after a loss. This is a reverse, or positive, D’Alembert variant. Because repeated losses can otherwise require a zero or negative wager, the example uses a one-unitmoneyUnitThe base stake a system or a player works in. Progressions are described in units so they apply at any table.Read full → floor.

Declared progression table

Start at 1 unit and never allow the stake below 1. The floor supplies the boundary required to continue the sequence after repeated losses.

Worked example

Bet 1 unit on blackbetBlackEven-money bet on the 18 black numbers. French: noir.Read full →. A win raises the next bet to 2; a second win raises it to 3. If the 3-unit bet loses, the next is 2. A further loss returns it to 1. The player has won 1 + 2 − 3 − 2 = −2 over those four completed bets despite the earlier wins, illustrating why a stake pattern is not a recovery proof.

Cost and risk

Increasing after wins makes later losses larger, while losses also tend to shrink the stake toward the floor. That changes volatility and the timing of exposure, not the even-money European edge of 1/37 per unit. An increment expressed as a percentage of bankroll can cap an opening stake, but it cannot make a negative wager positive. A finite floor and table rules should be specified before relying on any progressionstrategyProgressionAny rule that changes the stake based on previous results. Negative progressions raise it after losses, positive after wins.Read full → description.

Questions