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Subject: Re: Rough comparison between rotated bitboards and 0x88

Author: James Robertson

Date: 00:50:36 06/20/00

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On June 20, 2000 at 03:09:49, Tony Werten wrote:

>On June 19, 2000 at 19:54:39, James Robertson wrote:
>
>>On June 19, 2000 at 19:48:36, Larry Griffiths wrote:
>>
>>>I have found bitboards to be an even trade-off on my Pentium system.  I have to
>>>update about 6 bitboards when a piece moves and this generates a lot of
>>>instructions.  I get it back in my IsKingInCheck code so it evens out.
>>
>>While detecting check is faster with bitboards if you have many pieces on the
>>board, I think it is actually slower in endgame positions. :(
>
>I don't understand this. I have written it before but here it is again. You only
>have to look at the to and from square of the last move.

I do not understand.... could you please elaborate?

Thanks,
James

>
>It has nothing to do with the number of pieces.
>
>Tony
>
>>
>>James
>>
>>> I like
>>>to have fast move generation code, but most of my gains have been through
>>>alpha-beta, hash-table, killer-move and movelist ordering etc.
>>>
>>>Larry.



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