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Subject: Re: testing with crafty !!

Author: Mogens Larsen

Date: 15:29:14 06/22/00

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On June 22, 2000 at 17:59:27, Robert Hyatt wrote:

>Remember the tree.  If I play Nf3, you play e6, I play Ng5, I reach the same
>position as if I play Na3, you play e6, I play Ng5.  Totally different first
>move, totally identical final position.  The hit (hash) after Ng5 works no
>matter which move is searched first.

Okay, now I get it.

>It does that.  But at reasonable time controls, the hash table gets overwritten
>many times during a single search.  Remember that I search about 1M nodes per
>second.  that is 300M in 5 minutes.  at 16 bytes per entry, that would require
>4.8 gigs of RAM.   Very few have that much RAM for hashing.  :)  If you cut
>that by a factor of 10, then the tree is 10x bigger than hash.  Overwrite city.

Yes, that is very obvious, should have been able to make that deduction :o(. In
reality it doesn't matter how much you squeeze :o). Thank you answering my
nitwit questions.

Best wishes...
Mogens



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