The 666 system is an aggressive online roulette betting strategy but fairly low risk. It is similar to the cover-the-field system where you bet on as many numbers as you can. By betting on so many numbers at once, the theory goes, the chances of making a small profit is greater.
That's because roulette is a pure game of chance and the odds always favor the house (i.e., the casino), no matter which bet or combinations of bets you make, and regardless of what numbers have come up in the recent past. You will never, in the long run, overcome the house edge.