Author: Uri Blass
Date: 13:53:48 11/17/04
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On November 17, 2004 at 16:01:17, Robert Hyatt wrote: >On November 17, 2004 at 14:25:22, Uri Blass wrote: >>[D]1r6/8/8/8/8/k2B4/p2n4/K6R w - - 0 1 >> >>1.Bc2 Rb1+ 2.Rxb1 axb1Q+ 3.Bxb1 Nb3# >> >>Note that I see that Crafty has no problem to see the mate in this line so it >>does not return a draw for KB vs KN and stop to search. >> >>If the engines have no bugs it may be logical to adjudicate games of KB vs KN as >>draw after there is position with KB vs KN when there is no mate in 1 but not to >>do it only based on the fact that the position is KB vs KN. >> >>Uri > >In Crafty, if the search finds a mate, it is taken. If this gets to the >evaluation code, it is declared a draw... Yes but you need to search in order to find a mate. The point is that there are positions when you can return 0 and stop to search like KN vs K. In KB vs KN if you stop to search and return 0 you may miss the mate that I showed in the diagram. Uri
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