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Subject: Re: 50 moves rule in Crafty and Arena

Author: Matthias Gemuh

Date: 07:50:22 08/31/04

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On August 31, 2004 at 08:10:13, Uri Blass wrote:

>On August 31, 2004 at 07:56:08, Matthias Gemuh wrote:
>
>>On August 31, 2004 at 05:29:40, Günther Simon wrote:
>>
>>>On August 31, 2004 at 04:13:52, Jarkko Pesonen wrote:
>>>
>>>>The below was somehow stange.
>>>>Is this draw by 50 moves as Arena is saying or
>>>>does crafty 19.16 has bug with counting and letting the mate happen
>>>>in the last moment.
>>>
>>>A lot of programs have that bug. Some authors say it does happen
>>>such rarely that there is no need to fix it...
>>>
>>>Günther
>>
>>
>>
>>Only the few engines that generate only legal move lists can fix this
>>at an acceptable cost.
>>
>>/Matthias
>
>I do not think that you are right.
>
>Even engine without legal move generator can have a function to detect mate and
>if fifty=100 they can check if the position is checkmate before returning 0.
>
>Even if the function to check for checkmate is expensive it still called very
>rarely in games.
>
>Uri



Yes.



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