The most complete glossary of backgammon terms
Any game other than backgammon (1) which can be played on a backgammon board. Most backgammon variants use rolls of the dice to determine how the players' checkers move, just as in backgammon.
A rule often used in money play (but never in match play) which says: A player who accepts a double may immediately redouble (beaver) without giving up possession of the cube. The opponent (the player who originally doubled) may refuse the beaver, in which case he resigns the game and loses the current (doubled) stakes. Otherwise, he must accept the beaver and continue the game at quadruple the stakes prior to the double. See post by Sander van Rijnswou.