D'Alembert
Progression that adds one unit after a loss and removes one after a win.
In context
The flattest common negative progressionstrategyProgressionAny rule that changes the stake based on previous results. Negative progressions raise it after losses, positive after wins.Read full →: stakes drift up slowly in losing stretches and never explode. Expected lossmathExpected lossExpected value times total amount wagered; the average amount lost over a session or a period.Read full → is still 2.70% of turnovermoneyTurnoverThe total amount wagered over a session or period, counting re-bet winnings. Also: handle, action.Read full →.
Jean le Rond d’Alembert, a great mathematician, believed a coin was more likely to come up tails after heads. The system that carries his name is built on that error.