Roulette Strategy Video Information:

The D’Alembert roulette betting strategy, is also referred to as a negative progression system.
Basically, a player will increase his bets from one more bet unit when he looses, and decrease his bets from one less bet unit when he wins.
On this video is shown a table chart representing the d’Alembert roulette system, and how it goes with bets increase or decrease according to lost or won spins.

Source: YouTube