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Ply

1. One turn by one player, a measure of how far a player (or computer program) looks ahead when selecting a play or evaluating a position. See post by JP White.  Note: There is no agreement in the backgammon community as to whether plies are counted starting at 0 (as GNU Backgammon does it) or starting at 1 (as Snowie does it). See this thread and this thread concerning the controversy.