Author: Heiner Marxen
Date: 09:31:29 03/09/02
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On March 09, 2002 at 11:36:44, Olaf Jenkner wrote: >>>After 4,5 hours (PII 333MHz, 88 MB hash) Gustav says "no mate in 16". >>>It is possible to reach mate in 19 with brute force >>> >>>OJe >> >>If this is really "brute force", i.e. with unrestricted white moves, >>then Gustav shows a very impressive performance, here. >>It still extrapolates to 25 days, but that appears to be much more accessible. >> >>Do you do any special "tricks" or heuristics to speed up positions >>like this one? >> >>Cheers, >>Heiner > >This is really "brute force", i.e. with unrestricted white moves. >The program must avoid that the black rook leaves the 8th rank. >I.E. 1.Kf4 Rb8 2.Ke5 Rb5+ 3.Ke4 Rb4?? 4.feQ! >Perhaps Chest gives white the opportunity to promote. Gustav can >not avoid this every time but mostly. > >OJe Your suspicion is mainly correct. In the process of selecting a defender move, promotions of the defender are considered, but promotions of the attacker are not considered specially. This is due to the concept of an aggressive attacker. Unfortunately, here the defender has to use a defensive concept, and Chest is not well prepared to see the defensive benefit of blocking or guarding attacker promotions. :-( May be I can hack something, dunno yet. Thanks for commenting! Cheers, Heiner
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