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Subject: Re: 16 ply challenge: crafty 'solution'

Author: Gian-Carlo Pascutto

Date: 13:30:10 09/18/00

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On September 18, 2000 at 15:06:14, Uri Blass wrote:

>>How will you go a long time without getting big depth?
>>How will you get big depth without going a long time?
>
>You can get bigger depth in shorter time by using less extensions.
>I understand that this is exactly what Gian did if I understand correctly the
>words "tuned down extensions and razoring".

Correct. I picked the extensions/pruning changes in a way they should be
compatible with Dann's demands. Whether or not they are good is debateble
and I'm certainly not saying they are, but I do think the analysis is
valuable and means at least something. Else I wouldn't have wasted all
those cpu seconds on them ;)

>You can get bigger depth by using Fritz and not Hiarcs but Fritz's depth is not
>the same as Hiarcs depth and the proof is that hiarcs can solve more test
>positions at the same depth.

Absolutely right. I stated the exact same comparisation in my discussion
with Dann. Even if there is a linear relation between the two, 16 ply
Hiarcs still isn't == to 16 ply Fritz.

>>I suspect that any 16 ply depth will take several hours to compute at least.
>>Some of the problems I posted will probably take weeks if they can be solved
>at all.
>
>If I remember correctly the 16 plies of Fritz6a took less than 1 hour for mark
>young(I guess that Fritz does more pruning).

Correct. If you try some of the problems I solved on a regular Crafty it
will take a LOT longer too.

(hardware was PentiumII 360 for first 2 in last post, Cyrix120 for very first
and very last one)

--
GCP



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