Author: Sune Fischer
Date: 03:55:57 04/21/04
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>If threat extension does not help you to solve WAC141 at least 1 ply earlier >then it means that you probably have a bug in your implementation. It's a mate in 6 so it requires 12 plies (qsearch will detect the mate). The right move is found a ply 6 and the mate at ply 8, so every move almost gets extended to the max one ply. I have a different way of doing threat detections, it might interfere with this extension somehow. >I do not have threat extensions today but I believe that they can help when they >are done correctly. Hehe, how can I argue with that :) >I believe that not having threat promotion extensions costed movei the game >against resp in WBEC. > >>I think there are simply too many mates in 1 encountered in the search, most of >>them easy to refute and not worth an extension. > >Tord does not extend every mate threat and if I understand correctly the rule is >basically to extend mate threats only if you evaluate the side that threat mate >to be the inferior side. Yes I guess Tord does not believe that the best defense is an offense :) One thing to consider is that playing defense usually means handing over the initiative so the game will be prolonged, I think there is a risk factor in that somewhere. -S. >Uri
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