Author: Uri Blass
Date: 02:09:32 04/01/02
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On April 01, 2002 at 04:24:15, Uri Blass wrote: >On March 31, 2002 at 16:32:22, Kurt Utzinger wrote: > >>On March 31, 2002 at 14:16:58, Roy Eassa wrote: >> >>> >>>How long until it sees that White has a forced mate?: >>> >>>[d] 1k1K4/1p5P/1P6/8/8/8/p7/8 w - - 0 1 >>> >> >>Chess Genius 1.4 for Palm (16 MHz) does not find the solution with 7 min. And >>even after 1.h8Q a1Q the program shows no mate within the next 9 min. >>Kurt > > >My program is even worse at that position > >It get stuck at depth 9 in the original position and after >1.h8Q a1Q 2.Qg8 Qa2 it gets stuck after finishing depth 5 >and failing high at depth 6. > >The branching factor at depth 6 is clearly more than 1000. > >I suspect that the branching factor is an infinite number and >I will have to investigate what is the problem. > >Uri In order to investigate the problem I asked my program to print it's main line every 2^20 nodes. It seems that the problem is not infinite loop but some extensions that get out of control in that position I see that my program always print long lines of 21-22 plies here thanks to some extensions. I expect the next version not to have the same problems because I am not going to let these extensions in this case and similiar cases. Uri
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