Rule of 350 Points in Rating Difference

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.

7. 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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