Author: Bruce Moreland
Date: 19:56:52 02/16/99
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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? If you are getting decent depth you will rarely have problems with back-rank mates. I've seen my program mess up a couple of times because of it, but it is not a major problem. I think that it used to be a pretty big problem with my Chess Challenger 7, but I think that modern hardware has mostly solved this problem. The problems I have now involve underestimation of attacking chances involving sacrifices for open lines, and I think that most programs have these problems. bruce
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