I am wondering what explains the different patterns of ratings in the various backgammon variants. I am puzzled why there are so many more 2000+ ratings in Hyper and regular Backgammon than there are in Crowded, Nack and Race. Is it possibly just a function of the number of games completed? There are probably many more completed games in regular backgammon because it is the standard and more popular than any of the variants. There are more complete games of Hyper because the games are short; it may also be more popular than the other variants. Does anyone have another explanation?