Well i definately know snooker/pool has one, you can navigate to the page through help button.

However, i just tried the same thing on GO and it doesn't seem to have any information about the colours :(

But, upon further investigation (i apologise for the detective feel to this post :p) i found that chess has similar colours to Go, i just checked your rating of 242 being an expert, and it matches the chess rating system so maybe this can be used as a guideline. 

Grand Master  Above 480 
 Master       350 - 479 
 Expert       240 - 349 
 Advanced     150 - 239 
 Intermediate 80 - 149 
 Amateur      30 - 79 
 Novice       0 - 29 

http://www.flyordie.com/games/help/chess/en/rating_chess.html

Scroll to the bottom of that page for the colour of each rating

:) Chris