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Subject: Re: Bitboards, pre-computing moves, and blocked squares?

Author: Vasik Rajlich

Date: 01:39:19 12/02/04

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On December 01, 2004 at 15:03:01, Dan Honeycutt wrote:

>Hi James:
>
>Even though I started the 32 thing I believe you are exactly right.  If I'm on
>the a file I don't need to know anything about the h file but I must have all
>states of occupation for files b to g.  Six files, six bits, 64 for the array
>dimension.
>
>Dan H.

Yes - you need 6 bits.

In fact - I've never seen this trick documented anywhere. I guess all
bitboarders invent it independently as it's quite obvious IMO ...

Vas



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