1. How do compete for ranking?  
2. What are the conditions for a ranked game?  
3. What do the different colors before someones name mean?  
4. What kind of ranking system is used?  
5. How does the ranking calculation work?  
6. Can you give me an example calculation?  
7. What is the grade point ranking?  
8. How does the Allround ranking work?  
9 Why did I get a warning not to play my friends in a ranked lobby?  
10 Why did I loose my ranking points (at start of month)  
11 Will I get more ranking points for exceeding the point limit?  
12. Stranger Rule: Why can't I play a certain opponent?  
13. How does the 2 vs. 2 clan war ranking work?  
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3. What do the different colors before someones name mean?

150> 
50-150
-50-50
 <-50

If you click on the little arrow at the top of the game list (in the header, before 'players (xxx)') the little blocks expand and you can see the exact ranking score.