This article is from the Pool & Billiards FAQ, by Bob Jewett with numerous contributions by others.
The A-B-C-D ratings vary from room to room. In general, an A would give a B
a substantial spot, like two games in a race to six, and so on. An A plays
well enough that he wouldn't be embarassed to play in a state-level
tournament.
Various leagues have their own rating systems and evaluation methods.
If you try Equal Offense, you can compare yourself to other players with the
table at http://www.tourboard.com/ieo/rankings/
A skill test based on the game "Fargo" (which is used for on-line
tournaments) is available at: http://www.playpool.com/rsbasp/fargo
 
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