Author: Georg v. Zimmermann
Date: 06:09:03 12/03/00
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On December 03, 2000 at 03:21:01, Pham Minh Tri wrote: >Hi, > >Could someone explain to me what threat position is, how to detect and what to >do with it? A threat is to take a hanging piece or mate or gain a strategic advantage. A threat position is when the player not to move threatens something ugly. One way to detect it is with the NullMove. If (NullReturnValue < -MATE_IN_100) isThreat = 1; Note that this has a couple problems. First you need to search NullMove with whole window instead of window around beta, or with 2 windows. Second it detects longer mating threats only when DepthLeft-NULL_REDUCT is big enough. AFAIK most people that detect threat positions extend on those. For most threat = mate threat since else extensions blow up the tree I guess. Hope that helps a bit, Georg > >Thanks in advance. >Pham
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