The D'Alembert is also known as the Pyramid, because of the shape of
its fluctuating wagering structure. Its pretty simple: increase your bet
one unit after every loss, and decrease one unit after every win.
This is one of your pummel-your-way-to-victory deals, and it frequently
does work. But there will be times when your bets have been pushed to
the ionosphere, and there will be no one on hand to talk you down. Because
by that time, a lot of money will be gone, so who would want to?
This is one of the chilling facts of gaming: in the same spirit that
everyone loves a winner, nobody likes a loser.