Rule of 400 Points in Rating Difference

1. FIDE has been using the rule of 400 points in rating difference since 1 July 2009. The old FIDE rule of 350 points has been cancelled now.

2. The FIDE Handbook states the rule as this, " A difference in rating of more than 400 points shall be counted for rating purposes as though it were a difference of 400 points".

3. The following is a simple example when the rule is used:
- Case 1: Player C is rated 2000 (weaker) and his opponent 2420. The rating difference is 420 (2420-2000), more than 400 points.
- Case 2: Player C is rated 2000 (stronger) and his opponent 1550. The rating difference is 450 (2000-1550), more than 400 points.



4. FIDE will calculate Elo results for Player C:
- in Case 1: As though the opponent of Player C was rated 2400.
- in Case 2: As though the opponent of Player C was rated 1600.

5. Applying the FIDE rule of 400 points is the following:
- If you are rated 2400, and 2 your opponents 1000 each, the FIDE average of your opponents will be 2000, but not 1000 as expected.
- If you are rated 1800, and 2 your opponents 2400 each, the FIDE average of your opponents will be 2200, but not 2400 as expected.
- If you are stronger (for 400 points and more), your Expected Result for One Game will be 0.92.
- If you are weaker (for 400 points and more), your Expected Result for One Game will be 0.08.

6. If this Page is the first one of www.chesselo.com that you are visiting, you are recommended to begin reading from the very beginning by clicking the following link The FIDE calculation and chess Elo rating system in simple.

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