My pet peeve on this site is players who achieve a ridiculously high rating in just a few games (I still don't understand how the rating system allows that to happen) and then just sit there refusing to play more games. I have had a challenge outstanding with the #1 ranked nackgammon player for months with no response. He is not obligated to play me, but I think he should be obligated to play someone and defend his position. A very high rating based on a limited number of games is not an accurate indicator of ability in any case. Some system should be devised to prevent players from sitting forever at the top of the ratings without playing. Perhaps they could be moved back into provisional status if they don't finish a game in a given timespan (such as two months).