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Subject: Re: King danger extensions

Author: James Robertson

Date: 11:50:24 02/17/99

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On February 17, 1999 at 03:56:17, Ulrich Tuerke wrote:

>
>On February 16, 1999 at 16:26:53, James Robertson wrote:
>
>>My program keeps falling prey to king attacks. Although it does very well
>>tactically when it's king is not threatened, it frequently plays combinations
>>that win material (it thinks), only to find, say, a back-rank mate that went
>>unnoticed. I am using a one-reply-to-check extension, the mate extension after
>>null move, and extending half a ply whenever there is a check in the tree. No
>>check detection is done in the q-search. Are there any other standard check
>>extensions I am not doing?
>>
>>James
>
>I have had similar problems regarding blindness for back-rank mates. I tried to
>solve it this way: my the static evaluation determines if a king is on a weak
>back rank (e.g only escape squares to same rank and neither friendly rook nor
>friendly queen on the back rank to protect, ...). In this case the ecaluation
>sets a flag, which controls the move generation of the queiscence in order to
>also generate checking moves wth queen and rook to unprotected squares on the
>weaked back rank ; seems to help and doesn't cost too much, if you do this only
>close to the last full search ply.
>
>Uli

This is an interesting suggestion; I'll try it out.

James



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