“E” Backgammon Terms

Terms that Start with “E” Letter

There are - 22 - terms.

Equity

The value of a position to one of the players. Equity is the sum of the values of the possible outcomes from a given position with each value multiplied by its probability of occurrence. It is the same as the fair settlement value of the position. Your equity is the negative of your opponent's equity. See post by Gary Wong. Equity comes in different flavors.  See: Cubeless Equity, Cubeful Equity, Match Equity, and EMG Equity.

Equivalent-to-Money-Game Equity

Cubeful equity normalized by transforming it linearly so that winning a single game at the current value of the cube is reported as +1 and losing a single game at the current value of the cube is reported as −1. EMG equity is commonly used in match play to compare the size of errors in different games. See the Snowie Support FAQ for a further description and an example.

ER Backgammon

ER stands for Error Rate. Playing ER backgammon means playing with a view to making the least errors from the outset rather than deliberately making suboptimal plays to steer the game toward a position that your opponent will misplay or doesn't understand.

Error Rate

A measure of the average equity lost per move due to errors in play. The lost equity can be measured either in match-winning chances or EMG equity. Different programs compute error rate differently: Snowie divides by the total number of moves and reports the rate in "millipoints per move." Gnu Backgammon divides by the number of unforced plays. See post by Gregg Cattanach.

Escape

To advance a runner to safety or past the opponent's blockade.

Eureka

[Also spelled "Eureika".]  Simplified backgammon, in which each player starts with two checkers on his one, two, and three-point, and three checkers on his four, five, and six-point. See How to Play Eureika.

Exposed Checker

A blot within range of a direct hit.

eXtreme Gammon

A neural-net backgammon program introduced in 2009.   Website: eXtreme Gammon.