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Subject: Re: Natural move generation with bitboards (was Re:significant math)

Author: Sune Fischer

Date: 09:19:42 11/22/02

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On November 22, 2002 at 11:58:34, Alessandro Damiani wrote:

>On November 22, 2002 at 11:37:56, Sune Fischer wrote:
>
>>On November 22, 2002 at 07:42:51, Gerd Isenberg wrote:
>>
>>>For move generation, or if i really need disjoint attack sets, i currently favor
>>>attack bitboards for a single sliding piece as well for a knight. That is what
>>>my program does before with rotated bitboards and now with dumbfill and
>>>Kogge-Stone mmx-routines.
>>
>>There is another thing which bothers we with disjoint attack boards, namely that
>>they are _disjoint_.
>>
>>Some parallelism seem to be lost here, like how do you quickly detect a knight
>>attacking a certain square if your knight attack boards are split into 8?
>>
>
>Those 8 knight attack bitboards are only used for move generation. Each time a
>move has been searched the to-square is removed from such a bitboard.
>
>To do what you say the flood-fill attack detection functions are used.

You still need that NxQ pattern and all the others in your move ordering.

I suppose one could just OR them together.

-S.

>Alessandro



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