The most complete glossary of backgammon terms
The average number of rolls or pips (2) that can be played without having to make a major concession, such as leaving a blot, breaking a key point, or burying a checker. See post by Marty Storer.
The roll of 1 and 2 with two dice.
A backgammon variant in which the roll of 1 and 2 gives the player extra turns. See: How to Play Acey-Deucey.