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FIDE Rule of 400 Points

FIDE Handbook: "A difference in rating of more than 400 points shall be counted for rating purposes as though it were a difference of 400 points."

• FIDE has been using the rule of 400 points since 1 July 2009.
• If you are rated 2200, and 2 your opponents 1000 each, the FIDE average of your opponents will be 1800, but not 1000 as expected.
Explanation: 2200 - 1000 > 400, then the rating of each opponent is counted as 2200 - 400 = 1800.
• 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.
Explanation: 2400 - 1800 > 400, then the rating of each opponent is counted as 1800 + 400 = 2200.
• If you meet an opponent and your rating is higher than his or her by more than 400 points, your expected result for the game will be 0.92.
Explanation: If you are rated 2200 and your opponent 1000 or 1600, your expected result for the game will be 0.92 (2200 - 1000 > 400, 2200 - 1600 > 400, you are stronger).
• If you encounter an opponent and your rating is less than his or her by more than 400 points, your expected result for the game will be 0.08.
Explanation: If you are rated 1800 and your opponent 2400 or 2482, your expected result for the game will be 0.08 (2400 - 1800 > 400, 2482 - 1800 > 400, you are weaker).
• If the rating difference between you and your chess opponent is less than 400 points, the FIDE rule of 400 points is not applied.
Explanation: In this case, the expected result for the game is taken from the FIDE Table. For example, if the rating difference between the chess players is 0, then the expected result for the game is 0.50 for each player; if 100, then 0.64 for the stronger player and 0.36 for the weaker.
• Before, FIDE was using the old rule of 350 points which was replaced by the rule of 400 points.


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