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Subject: Re: Ply level vs Rating

Author: Tom Kerrigan

Date: 09:45:45 08/14/98

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Ooops, got my books confused. I guess I meant "How Computers Play Chess."

Sorry 'bout that.

-Tom

On August 14, 1998 at 11:04:50, Bruce Moreland wrote:

>
>On August 14, 1998 at 07:53:51, Tom Kerrigan wrote:
>
>>Sounds logical, but I recall a graph in "Chess Skill in Man and Machine" (one of
>>the few interesting/useful things in the book...) that showed 1 ply = 200 rating
>>points, up through Deep Thought.
>>
>>Of course, using this rule of thumb to compare two programs in the same "era" is
>>fairly pointless, but I think that over long periods of time, the rule of thumb
>>may still hold true.
>
>My copy of this is copyright 1977, updated in 1983, which predates Deep Thought.
>
>If you are referring to the chart on page 209 of the updated edition, in the
>chapter by Condon and Thompson, this work has come under something of a pall
>because it was based upon matches between the same program running at depth D
>and D-1.
>
>The book itself is old, and contains at least one pretty goofy chapter (chapter
>8), but there is some stuff about Belle, Chess 4.5, and a chapter by Newborn
>that contains some cool king and pawn endgame positions.
>
>bruce



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