Artful Dodger: Given the luck factor, how does one "cheat" at the game?

Actually I wasn't quite accurate. One of the cheats isn't a rating cheat per se, he's just a player who uses a backgammon engine for his moves. Plays most of his games in private so he can't be checked. (One reason why I think that private moves shouldn't be an option)

The others, as Rod says, are true rating manipulators. There's a pattern of starting new players and winning to get the exorbitant starting rating that the BK formula awards. These then lose to other accounts. There are also mid-range accounts which play and win against other mid-range players to pump up their rating before losing to a top-rated player to boost them, then going back to leech off some more mid-rangers.