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Subject: Re: Question about possible pawn positions

Author: Les Fernandez

Date: 11:00:20 12/29/02

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On December 29, 2002 at 08:24:22, Uri Blass wrote:

>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.

Hello Uri,

Well it may not be as relevant in chess progrmas but the work I am doing makes
it very relevant since I am generating chess positions with pawns for which I
need to know is a correct position or not.

Les

>
>Uri



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