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Illegal Play: A play that is not allowed based on the players actual roll. An illegal play is allowed to stand if neither player recognizes it before the next roll. While playing backgammon, one should always be on the lookout for illegal plays. Typically it is an error but some players try illegal plays on purpose to give themselves an advantage.

Inactive Builder: A checker that could be used to build another point but is currently being used as part of a point. See Builder. A checker on the 8 pt. after making the bar point with an opening 6-1 would be an inactive builder for the 5 pt.

Indirect Shot: A blot that can be hit only by a combination number using both of the dice. (7 or more pips away). If you have to leave a blot it is better to leave an indirect shot.

Inner Board: See Home Board.

Inside: Refers to Inner Boards.

Inside Backgammon: A popular backgammon magazine from the 70's and 80's. It is still possible to get back issues of Inside Backgamon.