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Print Page Chess Computer Community
    General Category => Discussions about Chess Computers => Message started by: chessnut23 on May 28, 2006, 03:18PM
	

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Title: Par Excellence
Post by: chessnut23 on May 28, 2006, 03:18PM

Does anyone know why Fidelity stated that par Excellence was "Certified" to be rated 2100 by The USCF, but current sites rate it at no more that about 1850? Is it because ELO ratings are lower than USCF ratings?

gary


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Title: Re:Par Excellence
Post by: sderyke2002 on May 28, 2006, 04:51PM

Its a combination of things.

First, the certification is based on results in one tournament, generally not even the 16 games that are required for human USCF official ratings. So it is not as official or as accurate as one would hope.

Second, most sites do alot more testing (albeit mostly computer VS computer results) which means it is likely more accurate (though the computer results do affect relative ratings as well).

And third, yes the results are probably ELO ratings which are lower than USCF.

But all in all the Par Excellence plays a very good game.


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Title: Re:Par Excellence
Post by: Mike Watters on May 29, 2006, 01:49AM

Yes and there is a fourth thing which has affected all chess computer ratings from those days.

A year after the Par Excellence was released Eric Hallsworth (Selective Search) had it rated at 2000 Elo. Now Selective Search has the Par Excellence at 1833 Elo. The Par Ex rating has 'subsided' like all ratings from those days.

A few more examples comparing Selective Search from years 1987 and 2006 -

Mephisto Amsterdam 2116 1948
Novag Super Forte/Expert A 2080 1835
Mephisto Super Mondial 1958 1802
Scisys Turbostar 1919 1760
Fidelity Elite A/S A 1817 1688
Fidelity Sensory 9 1702 1527

In around year 2000 the SSDF arbitrarily reduced all chess computers on their rating list by 100 points. This I think was a rather crude way of reflecting the reality. That is, that chess computers were not as strong as they were rated on the SSDF list relative to humans or PC programs but I do not know the background or full reasoning behind this decision. I wonder if anyone has the explanation given at the time?

All the best
Mike


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Title: Re:Par Excellence
Post by: drawmeister on May 29, 2006, 08:04AM

Manufacturers want you to buy their product but never believe everything you read.

For example the nicely named Saitek RISC 2500 which suggests a performance of 2500 elo and grandmaster level. It's a fine machine but not quite that good ::).

I had both the fidelity Excellence and Par Ex around the time they first came out and always rate them about 150 bcf { in old money} = 1800 elo.

In the late 1980's there were far fewer chess players who actually owned or even had the chance to play against a computer and i think this partially explains why the ratings were pitched so high. As time goes on computers become more mainstream and players get more familiar with them and their results start to improve. However it was still a brave move by the SSDF to realise all this and implement a cull in the ratings which others had to follow.

Ian.



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