Author: Albert Silver
Date: 09:23:21 11/27/99
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On November 27, 1999 at 11:56:17, Jonathan Lee wrote:
How can there be a conversion chart for ratings that work with different pools
of players and in which none rate all the players? The FIDE list only rates
players whose rating would be 2000 or more but doesn't include ratings below
that. What this means is that a player rated 2000 will only have games rated
that were played against players with the same rating or higher, but never
against anyone lower rated. There are a number of problems with this. For
example, it isn't just a matter of playing against opposition rated 2000 or more
but opposition rated 2000 FIDE or more. I can play (and this has happened) in a
tournament in which 5 of my opponents are rated 2000 or more, score 4/5 and
still lose rating points. Not because my rating is so high, but because my only
loss was against the only FIDE rated player, hence this was the only game that
counted towards my FIDE rating. The inverse is also true. The SSDF's rated
'members' do not have a rating in any rating list aside from its own.
Furthermore, it is extremely difficult to give a computer a rating other than an
estimate where human players are concerned. What was the conversion offered by
the rulebook for USCF and FIDE ratings? At best I've seen estimates of removing
100 points from the USCF ratings, but these are only estimates and vary a good
deal as well.
Albert Silver
> Is there a web site that has conversion between ratings?
> There is:
> SSDF Swedish
> ELO Hungarian
> USCF United States
> FIDE International (and a lot more)
> Yes, the November 1999 chess computer List uses the Swedish rating method.
> Maybe percentiles (among humans and/or computers) could be the universal
>method also.
> It is safe bet you could use 99%, 99.1%, 99.2%, etc.
> Almost everything is two thousand something (2000+) for the latest computer
>list in which 3000 is 100 percent.
> There should be no philosophical differences on this one.
> I do have a conversion between USCF and FIDE in a rule book.
> Jonathan (14th message)
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