Backgammon Dictionary

The value of cube ownership to the player being offered a double; the additional equity that comes from being the only player who may redouble.

A double other than the first double of a game. Only the player who last accepted a double may redouble.  Compare: Initial Double.

Enter a checker from the bar after it has been hit.

A position of known value that serves as a standard by which other similar positions may be measured or judged.  See: Cube Reference Position.

To resign the game at the current stakes after the opponent offers a double rather than continue play at twice the stakes.  Compare: Accept a Double.

To accept defeat. Resignation is a form of settlement; when you resign you must specify whether you are resigning a single game, a gammon, or a backgammon (2), and the opponent must agree. Resigning is not allowed in tournament play before contact is broken.

A chance to hit back after being hit yourself.

Bar.

Mobility.

[Verb.]  To throw a pair of dice.

[Noun.]  Two thrown dice, each showing a number from 1 to 6.

To make a new point at the leading edge of a prime using checkers from the rear of the prime. Usually the easiest way to roll a prime forward is to slot the point immediately in front of the prime.

To analyze a position by playing it out over and over again.

To estimate the equity of a position by means of computer simulation; see rollout.

An estimate of the equity of a position obtained through computer simulation. A rollout consists of numerous trials, the results of which are averaged together. See post by Gregg Cattanach.  See also: Truncated Rollout, Cubeless Rollout, Cubeful Rollout, Random Error, and Systematic Error.

A backgammon variant in which players have a once-per-game option of rerolling their own dice or asking for a reroll of the opponent's dice.  See: How to Play Roll-Over.

Bar.

[Because you "root" for your opponent to roll one.]  A dice roll that forces a position to collapse.

A period in a tournament during which each contestant (except those who received a bye) plays another contestant. For example, each round of an elimination tournament eliminates half the players.

A tournament format in which every contestant plays every other contestant in turn. The number of rounds required is one less than the number of contestants.  Compare: Elimination Format.

To escape a runner from the opponent's home board and it advance toward home as quickly as possible.

One of the two checkers that began the game on the opponent's one-point.

Any checker on the bar or in the opponent's home board.