This implementation complies exactly with the rule, to lower the bet by one unit after a win, even if the amount is <= 1.
As only real booked amounts are listed in the tests bet log, there is noted a 0. ( +0 instead e.g. + -2 )
In the balance charts those phases are shown as a flat horizontal area.
The Martingale !L- D+C roulette strategy also works according to the d'Alembert scheme,
but uses four third chances and thus has no waiting period except after zero.