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.