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Subject: Re: Question about possible pawn positions

Author: Uri Blass

Date: 05:24:22 12/29/02

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On December 29, 2002 at 08:11:13, John Lowe wrote:

>On December 29, 2002 at 07:00:11, Uri Blass wrote:
>
>>On December 29, 2002 at 00:26:50, Les Fernandez wrote:
>>
>>>[D]4k3/8/8/8/8/2P5/1PPP4/4K3 w - -
>>>
>>>The above pawn structure to the best of my knowledge can't ever be reached since
>>>the c3 pawn would have had to come from either b2-c2-d2.  Are there alot of
>>>these type of positions or are there a handful of pawn structures that we know
>>>can't happen?
>>
>>I do not understand your question because I do not know what you mean by a lot.
>>
>>There are other pawn structures that cannot happen
>>[D]8/8/8/8/8/P7/PPk5/K7 w - - 0 1
>>
>>Doy you ask for the number or the relative number of illegal pawn structures?
>>
>>Uri
>Hi Uri
>
>I wonder if the algorithm for spotting illegal pawn structures is complex or
>only fairly simple.........?

It may be possible to do a simple algorithm to spot part of the illegal pawn
structures but i believe that an algorithm to spot all of them may be complex.

Uri
>
>Illegal pawn structues don't happen in real games - human or computer so another
>question is "could the identification of an illegal pawn structure _ever_ be
>relevant in chess programming?"
>
>I don't think so..........you?

I agree.
I do not see how identification of an illegal pawn structure can be relevant for
chess programs.

Uri



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