Music Difficulty, Calculated by comparing accuracy of same player on different music
Performance of Player, Calculated from record performance
Highest record performance have greatest impact on the final result
*Record Performance: (accuracy - accuracy^2 + accuracy^4) * relative difficulty
*Impact on final result (higher to lower performance): 0.8, 0.8^2, 0.8^3 ...
*Same music with different platform: count only higher accuracy
Note, This is inaccurate, only a rough estimation based on the top 2000 players in each rank
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