Contra Bet Strategy for Roulette
Contra Bet na rule wey be like reverse D’Alembert: add one unit afta you win and remove one afta you lose.

One floor of one unit dey make di rule possible to follow when losses wey follow each oda for don reduce di next stake reach zerowheelZeroDi one green pocket wey no even-money, dozen or column bet dey cover; na im be di source of di house edge. Dem also dey call am: single zero, 0.Read di whole tin →. E no dey change di negative European expectation.
Di Rule and Im Limit
Use one outside even-money betbetEven-money betRed/black, odd/even, high/low. 18 numbers, e dey pay 1:1.Read di whole tin → with one increment wey no pass 1% of di bankrollmoniBankrollDi total moni wey you set aside for play. Bankroll management na to decide how much of am you go risk for each bet and for each session.Read di whole tin →: add one increment afta you win and remove one afta you lose. Dis na one reverse, or positive, version of D’Alembert. Becos losses wey follow each oda fit otherwise ask for bet of zero or less, di example dey use one floor of one unitmoniUnitDi base stake wey system or player dey work with. Dem dey describe progressions in units so dat dem go fit work for any table.Read di whole tin →.
Di Progression Table Wey We Declare
Start for 1 unit and no ever allow di stake go below 1. Di floor dey give di limit wey you need to continue di sequence afta losses wey follow each oda.
Example Wey We Work Out
Bet 1 unit on blackbetBlackEven-money bet for di 18 black numbers. For French: noir.Read di whole tin →. One win dey raise di next bet to 2; second win dey raise am to 3. If di 3-unit bet lose, di next one na 2. Anoda loss dey take am back to 1. Di player don win 1 + 2 − 3 − 2 = −2 for dat four bets wey don finish, even with di wins wey come first, and dis one dey show why stake pattern no be proof sey you go recover.
Cost and Risk
To increase afta wins dey make di losses wey come later big pass, while losses dey also dey push di stake down go di floor. Dat one dey change volatility and di timing of di risk, no be di even-money European edge of 1/37 for each unit. One increment wey you write as percentage of bankroll fit put cap on di first stake, but e no fit make negative bet turn positive. You suppose state one finite floor and di table rules before you trust any description of progressionstrategyProgressionAny rule wey dey change di stake based on di results wey don pass. Negative progressions dey raise am afta losses, positive ones afta wins.Read di whole tin →.
Questions wey pipo dey ask
Im direction na di direction of reverse D’Alembert: stakes dey rise afta wins and dey fall afta losses.
Without floor, to remove afta losses go reach where e go ask for zero or negative bet. Di floor of one unit dey stop dat instruction wey no possible.
Small laugh

Two wins and two losses, two units down: di bigger bets come afta di wins.
Sources
- RouletteDoc, “Contra Bet system” — di rule wey dem state and di part wey no clear
- Roulette77. Description of di strategy and examples.
- Wizard of Odds, D’Alembert Betting System — background of di normal D’Alembert
- Wizard of Odds, The Truth about Betting Systems