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Subject: Re: Chess program crash generator

Author: Sune Fischer

Date: 14:43:15 05/10/05

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On May 10, 2005 at 14:00:25, F. Huber wrote:

>On May 10, 2005 at 13:52:31, Dann Corbit wrote:
>
>>Which is (of course) a prefectly valid result.
>>
>>I would prefer a more specific diagnosis (e.g. 'Too many pieces -- count > 32'
>>or 'Too many black queens -- count > 9' or something of that nature.  But
>>diagnosic+failre is one of the two ideal situations (the other being processing
>>the position normally for "extended" problem solving.  Some of Leonid's
>>fascinating positions along with Venton Abillo's positions are not always
>>legal).
>
>You´re right, they are sometimes ´a little bit´ illegal - but not so extreme.
>
>IMO at least 2 conditions should always be true:
>1) exactly one king for each side
>2) a maximum of 16 pieces for each side

Number 2 is not strictly necessary, I think many engines can
play perfectly sensible "chess" with more than 32 pieces.

However, to be well defined at least the following must be true

 *) no pawns on 1st and 8th rank
 *) side not to move must not be in check (includes non-adjacent kings)

and of course exactly one king for each side as you mention.


>That are e.g. the necessary requirements for Chest, and seem quite logical
>to me - everything else should not really confuse a well programmed engine!

Hmm.. :)

-S.
>Regards,
>Franz.



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