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Yu-Gi-Oh!

Official Konami COSSY

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Official Konami COSSY

The Yu-Gi-Oh! COSSY is for ranking players skills in the Yu-Gi-Oh! Trading Card Game. It is short for Card Game Official Tournament Support System.

It ranks players all around the world according to the Elo rating system and tells them where they stand in comparison to other players, in both global and national rankings in official tournaments.

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