Author: Sune Fischer
Date: 16:34:07 12/27/03
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On December 27, 2003 at 17:47:08, Christophe Theron wrote: >> >>I do not understand how everybody can solve that so fast..:( >> >>frenzee needs almost 17 seconds. >> >>10 242 620 4841759 1...Ra1+ >>10 235 723 5652670 1...Ra1+ 3.Rf1 Ra3 4.g3 Rb3 5.h4+ Kg6 6.Rf2 Kf6 7.Be4 Rxg3+ >>11 236 1043 8219719 1...Ra1+ 3.Rf1 Ra3 4.g3 Bh3 5.Bg2 Bf5 6.Re1 Ra2 7.Re7 Kf6 >>12 0 1690 13513082 1...Ra1+ 3.Rf1 Rxf1+ 4.Kxf1 Bh3 5.gxh3 Kf6 6.Kf2 Kg7 7.Bd5 >>13 0 1706 13682948 1...Ra1+ 3.Rf1 Rxf1+ 4.Kxf1 Bh3 5.gxh3 Kf6 6.Kf2 Kg7 7.Bd5 >> >>-S. > > > >By evaluation. After Ra1+ Rf1 Rxf1+ Kxf1 Bh3 gxh3 the position is a theorical >draw because you only have pawns on the H file, the Bishop is not of the color >of the promotion square and the opponent's King is already too close from this >promotion square. Yes that must be it, my detector triggers only if the king is in the corner so that line above isn't detected as a draw. The problem is it's not always a draw if the other king or pawn can reach the promoting square first. I guess I need to evaluate the races to the corner in order to get this a few plies earlier. What I dread, is that with enemy bishops on the board the lone king has to run in zig-zags across the board and that complicates the task quite a lot AFAICT. That's why I'm surprised so many gets it so fast, perhaps there is a simpler way I haven't thought of or perhaps their detector is more "speculative". :) >Adding this evaluation rule will not make your program stronger, but you will be >proud to answer to this kind of message "yes, my program solves it in >0:00:00.00s". :) It doesn't hurt to "look good" :) Actually, I think if one adds enough of these primitive pieces of knowledge, then sooner or later it will decide some games. Though with endgame tables it must be questionable how much it helps. -S. > Christophe
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