With some similarities to the Martingale strategy, d’Alembert strategy has its own peculiarities.
Based on the size of the bank, a punter defines the value of one unit, for example it is £10. If the bet loses, he should increase the amount of bet by one unit, and if it wins – reduce the amount of bet by one unit.
A £30 bet with 2.0 odds – loss, the bank returns to its original value;
A £20 bet with 2.0 odds – win.
Thus, after the cycle closes, a new cycle should not be started from one unit, that is £10, as in a standard Martingale, but with the amount a unit smaller than the previous won bet.