"Backgammon" is not mostly luck, or there would not be players with ratings as high as yours! An individual game of backgammon can be determined by the dice, but a player's overall success -- such as is shown by his rating -- is determined entirely by skill. In other words, since in the long run luck is the same for everyone, a player's RELATIVE degree of overall success has nothing to do with luck and everything to do with his or her ability.