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Subject: Re: SSDF Rating Irregularities

Author: Enrique Irazoqui

Date: 20:23:44 12/10/99

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On December 10, 1999 at 22:53:41, Len Eisner wrote:

>On December 10, 1999 at 22:26:43, Chuck wrote:
>
>>On December 10, 1999 at 20:16:13, Bertil Eklund wrote:
>>
>>>On December 10, 1999 at 20:01:28, Chuck wrote:
>>>
>>[snip]
>>
>>>>
>>>>I think it is very easy to prove that Robert is right here. It is very
>>>>noticeable. I once played out a 40/2 match between a Mach IV and a Mephisto
>>>>Polgar, the Mach IV one 10-2. The two machines are very close in strength,
>>>>probably within 100-150 points. But playing many games and watching these two
>>>>computers evaluate positions, it was evident that the speed of the Mach IV
>>>>(compared to the Polgars 5 Mhz) gave it a big tactical advantage. Head-to-head
>>>>this seems to be magnified. I played an old MChess against the Mach IV and it
>>>>won 11-1. Wow, what results. The point is, when a progam plays another which is
>>>>on significantly slower hardware, the faster program is going to win big and
>>>>it's rating will be inflated. Two years later, when it becomes the one with slow
>>>>hardware, it will be the one getting pounded, and it's rating will go down. I
>>>>think at one time the Mach IV was on the SSDF list at around 2200, but late in
>>>>it's life it dropped to below 2100.
>>>>
>>>>Chuck
>>>
>>>Hi!
>>>
>>>As checked houndreds of times this is completely wrong.
>>>
>>>Play two-houndred games and the level should probably be accurate.
>>>
>>>Bertil SSDF
>>
>>Then explain to me how the Mach IV had a SSDF rating of 2282 in January 1993 but
>>now has a SSDF rating of 2074!?!

How many games did it play by 1/93 before getting the 2282 rating?

Enrique

>>Chuck
>
>Yes, that is the question, and it applies to the other old programs too.  If
>computers are anything, they are consistant, so the Mach IV would play exactly
>the same today as it did in 1993, yet its rating is over 200 points lower.
>
>Len



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