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Subject: Re: Ruffian 1.0.0 can't mate with KR v K??

Author: José de Jesús García Ruvalcaba

Date: 11:25:02 09/27/02

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On September 26, 2002 at 10:20:48, Uri Blass wrote:

>On September 26, 2002 at 09:33:37, Albert Silver wrote:
>
>>On September 26, 2002 at 09:11:48, Bernhard Bauer wrote:
>>
>>>On September 26, 2002 at 09:03:14, Andreas Guettinger wrote:
>>>
>>>>In general I agree that TB should be used and do the work for the engine
>>>>wherever possible, but KRxK? Hey that's the basics! Even my cat can win that! :)
>>>>
>>>>Andreas
>>>
>>>That means your cat dosn't make use of the nullmove heuristic.
>>>If you teach your cat how to use nullmove it may no longer win that!
>>>Bernhard
>>
>>Don't just about all of the top engines use nullmove? Funny that I never heard
>>of one of them not being able to mate with K+R vs. K
>>
>>                                     Albert
>
>1)I am not sure if they use it in K+R vs K
>2)I suspect that not every use of null move in K+R vs K is going to lead to a
>draw.
>
>Null move pruning means pruning position with no threat and if the position when
>the side with the king is in zunzwang are positions when there is a threat then
>it means that they are not going to prune them.
>
>Uri
>Uri

Hi,
in general it is not posible to win KR vs K if the side without the rook is
allowed to pass.
José.



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