Author: Uri Blass
Date: 12:15:54 12/14/02
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On December 14, 2002 at 14:40:36, Ulrich Tuerke wrote: >... >>>CM sees a mate in 14 in iteration no 1 ? >> >>No >> >>It is not iteration 1 but iteration 9. >> >>1 is only the brute force depth that is used(by chessmaster definition every >>program that is using null move pruning without zugzwang detection is searching >>depth 1 because if there are moves with no threat they are not searched to more >>than depth 1 by chessmaster's definition) >> >>chessmaster often search depth 1 in the middle game because in the middle game >>it does not care for zugzwang detection. > >What's the source of your surprisingly good knowledge of CM, Uri ? Common sense and experience with chessmaster6000. I saw that chessmaster6000 can show depth 1/7 in the middlegame with selectivity=6 but only 6/7 in the endgame. I also looked at the searching lines of chessmaster and I guess that when the depth is 6/7 chessmaster simply does not use null move in the first 6 plies. I remember that john merlino claimed that depth 1/9 means that 9 plies are the minimal extension but I never saw case when chessmaster missed a simple tactic at depth 1/9 in the middle game when zugzwangs are impossible. If 1 is brute force by normal definition then it is not possible. If 1 is brute force by definition that says that 9 is the brute force depth when null move is allowed then it is possible. Uri
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