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Subject: Re: Who is the champion in calculating perft?

Author: Uri Blass

Date: 15:07:26 11/22/01

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On November 22, 2001 at 16:26:50, Andrew Williams wrote:

>On November 22, 2001 at 15:52:22, Uri Blass wrote:
>
>>The times of my program in calculating perft(number of legal games of fixed
>>number of plies) are not bad.
>>
>>I get on p800 33 seconds for finding perft 6=119060324 in the initial position
>>and also 33 seconds for finding perft 5=193690690 in another known position
>>
>>this is not a mistake and my program needs similiar time because it generates
>>only legal moves so it needs less nodes to calculate perft 5.
>>
>
>Well I'm happy to confirm your node counts, Uri, but PostModernist can't
>match your speed! For the starting position, it takes PM 166 seconds on an
>Athlon 1200 to complete six plies. For the position below, it takes 335
>seconds to complete 5 plies.
>
>Andrew

These numbers are correct but I am sure that I am going to find numbers that are
not correct if I let it search deeper because there are known bugs and maybe
unknown bugs in my move generator.

I knew that the numbers are correct and I used Crafty or Yace to discover my
mistakes when the numbers were not correct(I started by discovering smaller
numbers that were not correct).

My move generator is very complicated so I am not going to be surprised if there
are more bugs that I do not know about and I may use perft 7 of the initial
position and perft 6 of the the position that was posted to continue to test it
even after correcting the known bugs.

Uri



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