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Estimated rating and rank:
0-150: Novice
150-500: Recruit
500-1000: Warrior
1000-1500: Knight
1500-2250: Crusader
2250-3000: Champion
3000-3500: Master
3500+: Hero.
I would also suggest creating a unique insignia for each rank, using a combination of swords, etc., instead of stars and stripes. The insignia would be displayed under the user's name. (First, we need to create an organization for registering ranked players):D
:D