Hi, I'm wondering how the provisional rating equation works. I'm having difficulty understanding how the (W-L) section ties in to the final result.
I recently played a tournament where I lost nearly 200 rating points (from 2100 down to 1918), and I'd like to confirm the rating calculation was correct.
My new rating says I have played 12 rated games in total, however since my previous total was 7 games, and I just played 5 more, it appears maybe some games
which should not have counted towards my new rating have been added incorrectly. Specifically, 2 games where I played opponents who's ratings
were more than 400 points below my rating. (1300ish, and 1655.) Should my total games not equal 10 now? I appreciate any help on this question!
413. Matches.Individual matches are rated with the following restrictions:
a) the maximum change allowed as a result of a match is 50 points;
b) match results must be dated and signed by both players;
c) the rating difference between the two players must not exceed 400 points.
414. Equations.The equations used to calculate ratings are as follows:
a) For previously unrated and provisionally rated players, the performance rating is:
Rp = Rc + 400 (W - L) / N
where Rp is the performance rating,Rc is the average rating of the player’s opponents,Wis the number of wins,L is the number of losses,N is the total number of
games played.
Thanks,
Ken Ferguson
I recently played a tournament where I lost nearly 200 rating points (from 2100 down to 1918), and I'd like to confirm the rating calculation was correct.
My new rating says I have played 12 rated games in total, however since my previous total was 7 games, and I just played 5 more, it appears maybe some games
which should not have counted towards my new rating have been added incorrectly. Specifically, 2 games where I played opponents who's ratings
were more than 400 points below my rating. (1300ish, and 1655.) Should my total games not equal 10 now? I appreciate any help on this question!
413. Matches.Individual matches are rated with the following restrictions:
a) the maximum change allowed as a result of a match is 50 points;
b) match results must be dated and signed by both players;
c) the rating difference between the two players must not exceed 400 points.
414. Equations.The equations used to calculate ratings are as follows:
a) For previously unrated and provisionally rated players, the performance rating is:
Rp = Rc + 400 (W - L) / N
where Rp is the performance rating,Rc is the average rating of the player’s opponents,Wis the number of wins,L is the number of losses,N is the total number of
games played.
Thanks,
Ken Ferguson
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