Author: Ernst A. Heinz
Date: 02:53:21 10/12/98
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On October 12, 1998 at 05:02:09, Bernhard Bauer wrote: >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 "DarkThought" knows about insufficient material but *also* about the exceptions. It solves your above examples within fractions of a second. As I have already pointed out before, the efficient implementation framework for interior-node recognition allows us to incorporate such knowledge with hardly any losse of search speed. =Ernst=
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