If you click on plays by date, then click details, you see Player, New, Position, Team/Color, Score, Win, and the Rating. I'm just wondering what the idea was with the rating thing. Can you point me towards the thread it was discussed in? When I search I just find stuff for game ratings.
OK, I see now what you're asking about.
I'd guess that it was a player ranking that may, or may have not, have gotten implemented.