Author: Bernhard Bauer
Date: 02:02:09 10/12/98
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On October 11, 1998 at 01:37:52, Bruce Moreland wrote: > >On October 10, 1998 at 21:25:25, James T. Walker wrote: > >>I tested Crafty15.20 tonight and it solves the problem instantly. I also tested >>the following computers/programs. ALL solved the mate instantly. >>Fritz5.0,Rebel Decade 2.0,Rex2.3,Fidelity Mach3,Fidelity Mach IV,M-Chess Pro 3.5 >>M-Chess Pro 5.0,Genius 4.0, Genius 2.0,Kasparov's Gambit,CM4000,CM5000,CM5500 >>and my handheld Mephisto Marco Polo(USCF about 1800). I do not have a single >>program/computer that does not solve this instantly. Maybe the creator of JR. >>should take a look at this problem. >>Jim Walker > >After you check to see if they find the mate, please also check to see if you >can play out the main line by making each move. Also, check to see whether it >works with colors reversed. I bet that there are cases where programs will call >the game a draw, without executing the mate, or without allowing you to execute >the mate. > >bruce Yes, we should be carefull in this type of position. For the following position: White: Kc8, Bg8 Black: Ka8, Ba7 White to move FEN: k1K3B/b/8/8/8/8/8/8 w Crafty 15.20 will move Bh7 instead of mating with Be5# and it will tell us game is a draw due to insufficient material. The learning is wrong too. Crafty says: learning position, wtm=1 value=-66 By the way, the "insufficient material feature" has further consequences. For the following position, which is a mate in 6 Crafty has no clue. FEN: 8/1k1K4/8/8/1pN5/1N6/8/8 w Kind regards Bernhard
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