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Subject: Re: Bitboard question

Author: Vincent Diepeveen

Date: 15:48:11 05/26/02

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On May 26, 2002 at 18:15:41, Robert Hyatt wrote:

>On May 26, 2002 at 16:07:41, Vincent Diepeveen wrote:
>
>>On May 25, 2002 at 18:02:45, Gian-Carlo Pascutto wrote:
>>
>>>On May 25, 2002 at 17:29:03, Vincent Diepeveen wrote:
>>>
>>>>you know very little from programming GCP.
>>>
>>>I know Sjeng can do it :)
>>>
>>>--
>>>GCP
>>
>>then you can do more than Bob and all of his advisors
>>could imagine about a year ago in extensive discussions
>>where i showed what bitboards CANNOT easily do.
>>
>>This was no problem for bob as he doesn't believe in
>>knowledge. He believes in a bit of crude/rude/crafty
>>knowledge which then has to search zillions of nodes
>>a second.
>>
>>Most likely you do something simplistic which is rude
>>and not accurate.
>>
>>Be happy with it.
>>
>>For DIEP that accuracy is not enough.
>>
>>That's why i can't use bitboards. Not at 64 bits not at 32 bits.
>>
>>Best regards,
>>Vincent
>
>
>I have said this before, I will say it again.  Bitboards are mathematically
>provable to be just as good as any other chess board representation.  Think
>about it for a minute and you will understand why.  There is nothing you can
>do with your offset (mailbox) board representation that I can't do with
>bitboards, and vice-versa...

As proven a year ago it is over 3 to 4 times slower to do certain
things using pure bitboards. The word impossible is not good then,
but the word 'not a smart datastructure to use' is more valid, though
for me it comes down to the same.

Best regards,
Vincent



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