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Subject: Re: Detecting backward pawns

Author: Will Singleton

Date: 22:41:21 06/16/99

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On June 17, 1999 at 00:16:56, James Robertson wrote:

>On June 17, 1999 at 00:10:11, James Robertson wrote:
>
>>I am trying to find the most efficient way to detect backward pawns, either with
>>bitboards or the more conventional piece array. Any help is greatly
>>appreciated!!
>>
>>James
>
>I suppose I could add to this. I decided that a backward pawn must be:
>
>On an open file,
>Unable to be defended by another pawn,
>unable to advance without capture by an enemy pawn (it may be able to advance,
>but that wouldn't take it off the open file or defend it with another pawn).
>
>I cannot figure how to make this all work without tons of arrays and all sorts
>of other nasty stuff.
>
>Help!
>James

I use tons of arrays, and other nasty stuff.  But with pawn hashing, it really
doesn't matter, speed-wise.

Will



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