Author: Robert Hyatt
Date: 11:22:39 03/18/99
Go up one level in this thread
On March 18, 1999 at 11:12:16, Andrew Dados wrote: > >On March 18, 1999 at 10:23:23, KarinsDad wrote: > >>On March 17, 1999 at 22:21:09, Robert Hyatt wrote: >> >>>On March 17, 1999 at 17:43:21, KarinsDad wrote: >>> >>[snip] >>>>Robert, >>>> >>>>Are you saying that the servers do not decrease the ratings changes (i.e. halve >>>>them just due to the fact that a higher rated player is playing) for the higher >>>>rated players? >>>> >>>>If so, this is strange and disturbing. >>>> >>>>KarinsDad :| >>> >>> >>>No... the Elo system has a 'max change' paramater K, that seems to be set to >>>32 for most places. And that works well in that the most your rating can change >>>with any one game is 32 points. But it is proportional to the rating difference >>>between you and your opponent. >>> >>>Other servers use a smaller K (chess.net for example) as suggested by the >>>'glickman' proposal for rating calculation. If you reduce K, then you reduce >>>the maximum rating change delta. and you limit rating 'swings'... >> >>Robert, >> >>As I'm sure you are aware, the USCF modifies the K for higher rated players. >> >>For players 2100-2399, the change is multiplied by 0.75. >>For players 2400+ , the change is multiplied by 0.5. >> >>It would seem logical for the chess servers to do something similar since you do >>want some more major level of stability at the higher ratings than you need at >>the lower ratings. >> >>Do any of the servers publish their K values and potential modifications to it? >> >>Thanks, >> >>KarinsDad :) > > Go to fics and type 'help glicko' for highly detailed explanation how K is >obtained there... >does it make practical sense - that's a different story... >-Andrew- I don't know if FICS still uses the Glicko system, but the last time I looked, they did, and it was _far_ better, IMHO. In that it tended to limit big rating swings..
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