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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