EXtreme Gammon

eXtreme Gammon is backgammon software written by Xavier Dufaure de Citres and released in 2009. 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. It rates matches according to the number of mistakes committed by players, providing a widely accepted benchmark for players' skills.