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Topic: Ratings: the K factor
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Author
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BTW, (ED) is the difference between rating. Example:
I am 1600, my opponent is 1400.
My ED is 1400-1600 = -200
But, if I am 1400, and my opponent is 1600:
My ED is 1600-1400 = +200
So this define the signal. The point is: if I win a better player, I earned more points.
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And to define the +/- C signal is easy:
If I win (no matter the rating):
+C
If I lose (no matter the rating):
-C
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An practical example:
PlayerA 1600 beats playerB 1400
RA = 1600+0.04*(-200)+16 = 1608 = 1600+8
RB = 1400+0.04*(+200)-16 = 1392 = 1400-8
PlayerA 1600 lose to playerB 1400
RA = 1600+0.04*(-200)-16 = 1576 = 1600-24
RB = 1400+0.04*(+200)+16 = 1424 = 1400+24
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See you,
Beco
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Does the USCF state whether you should use the ratings of the players at the start or the end of a game when carrying out this calculation?
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This was subject of discussion a while ago. In the end, a member (Alopinto if I remember correctly) emailed the USCF and asked and they said the ratings are taken at the end of the game, like this site does.
Miguel
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Hi Miguel,
I was trying to find this topic here, before I asked in other one... :)
This one has the formulas I need. Is everything ok, or they changed here in QA after your last updates?
Thanks,
Beco.
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The formulas listed above haven't changed.
Miguel
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