The D’Alembert system was invented by the 18th century French mathematician Jean-Baptiste le Rond d’Alembert and is perhaps the easiest of all Roulette strategies to apply. As a negative progression system, it involves you placing a bet, adding one unit to it if you lose, or removing a unit from it if you win, i.e. raise when you lose, lower when you win. Predicated on the idea of natural equilibrium, the D’Alembert strategy works best when applied to a set of even wins and losses for the same bet – but of course you won’t know what the Roulette wheel has in store for you until you start to play.
I wanted to love this service because I love to support any female entrepreneur, however I don't think it is worth the money for someone who sees Broadway shows more often than once or twice per year. This service is perfect for someone who is in town for a day or two and would like to see any show (and doesn't care which one they see), but not for the Broadway enthusiast --- unless you use it so often that a majority of shows are automatically removed for you (Broadway Roulette will never send you to the same show twice, so after you log in again after your first show, it is already stricken from the list and you do not need to remove it again).