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I think the thing about backgammon is that the luck of the dice means that a weak player can beat a stronger player quite often. This means that playing only players with high ratings would be an advantage. In chess this isn't the case.
I wonder whether any rating systme can be effective for backgammon unless the doubling cube is used? Perhaps the die hard backgammon players can answer that?
(kaŝi) Se vi alklakas la nomon de ludanto, kaj poste 'Finitaj ludoj', vi ricevos liston de finluditaj ludoj, poste alklaku nomon de ludspeco por ricevis superrigardon super ĉiuj tiuspecaj ludoj, poste alklaku denove la nomon de ludo, kaj vi ricevos tiun renkonton por rigardi kaj analizi. (Servant) (Montri ĉiujn konsilojn)