1. It was Grandmaster Anand Viswanathan (India) who proposed to use the rule of 350 points in rating difference.
2. FIDE was using the rule of 350 points in rating difference from 1 April 2006 to 1 July 2009.
3. The FIDE Handbook stated the rule as this, " A difference in rating of more than 350 points shall be counted for rating purposes as though it were a difference of 350 points".
4. The following is a simple example when the rule was used:
- Case 1: Player C is rated 2000 (weaker) and his opponent 2420. The rating difference is 420 (2420-2000), more than 350 points.
- Case 2: Player C is rated 2000 (stronger) and his opponent 1600. The rating difference is 400 (2000-1600), more than 350 points.
5. FIDE calculated Elo results for Player C:
- in Case 1: As though the opponent of Player C was rated 2350.
- in Case 2: As though the opponent of Player C was rated 1650.
6. Applying the FIDE rule of 350 points was the following:
- If you was rated 2350, and 2 your opponents 1000 each, the FIDE average of your opponents was 2000, but not 1000 as expected.
- If you was rated 2150, and 2 your opponents 2600 each, the FIDE average of your opponents was 2500, but not 2600 as expected.
- If you was stronger (for 350 points and more), your Expected Result for One Game was 0.89.
- If you was weaker (for 350 points and more), your Expected Result for One Game was 0.11.
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