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.
A guideline for cube handling in pure race positions. If you add 10% to your pip count, you should double if the result is not more than two pips greater than the opponent's count, and you should redouble if the result is not more than one pip greater. Your opponent should accept the double if your count plus 10% is no more than two pips less than his count.