The FIDE assigns a player not one but three different ratings:
- For classical games featuring long time controls, that is, 90 minutes for the first 40 moves + 30 minutes for the rest of the game + 30 seconds increment from move one, the players have a standard rating.
- For games played with a time control of 15 minutes + 10 seconds increment, the players have a rapid rating.
- For games played with a time control of 3 minutes + 2 seconds increment, the players have a blitz rating.
A similar method for rating players is also implemented by many websites like Chess.com and the ICC. Why is this done? Wouldn't it be easier and more efficient to measure the global strength of a player to have only one rating?
This question is based on one that was being closed because of being unclear what it was asking.