eXtreme Gammon is backgammon software written by Xavier Dufaure de Citres and released in 2009. [1] It is available for Microsoft Windows and mobile platforms.
According to the Financial Times, the program is the best backgammon player in the world, and the near-exclusive study tool for all serious backgammon players. [1] It rates matches according to the number of mistakes committed by players, providing a widely accepted benchmark for players' skills. [1]