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Topic: Ratings: the K factor
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becoBrazil flag
Dec 6 2005 07:38 PM
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.
------------
And to define the +/- C signal is easy:

If I win (no matter the rating):
+C
If I lose (no matter the rating):
-C
-----------

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

--
See you,
Beco

StuEngland flag
Dec 22 2005 02:46 PM
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?


miguelUnited States flag
Dec 22 2005 04:51 PM
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

becoBrazil flag
Apr 19 2007 10:22 PM
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.


miguelUnited States flag
Apr 20 2007 00:35 AM
The formulas listed above haven't changed.

Miguel

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