Author: Uri Blass
Date: 08:44:46 03/27/02
Go up one level in this thread
On March 27, 2002 at 09:59:05, Robert Hyatt wrote: >On March 27, 2002 at 07:18:09, Aaron Tay wrote: > >>On March 27, 2002 at 06:55:43, James T. Walker wrote: >> >>>On March 27, 2002 at 05:28:28, Jouni Uski wrote: >>> >>>>[D]8/B5pp/4k3/P7/6n1/8/P6P/7K b - - 0 41 >>>> >>>>Crafty as black played Nxh2!!(??). Yes the game ended draw so the move is >>>>probably correct, but I doubt, that Crafty's evaluation really understand this. >>>>E.g. if white plays a6 then black has no way to a8 square... >>> >>>******* >>>You can't have it both ways! If the move is correct then a6 means nothing. If >>>a6 wins then Nxh2 is definitely wrong. Can you prove that a6 wins? Crafty is >>>counting on the Bishop not covering the a8 square I guess. But this could be >>>one of the exceptions to the rule if you can prove that a6 wins. The black King >>>must head for c7/c8 so it can get to b8 then a8 if the Bishop moves. I suspect >>>it all hangs on a tempo. How is the lone King to stop the two connected passed >>>pawns without moveing the Bishop? >>>******** >> >>[D]8/B7/4k3/P7/6n1/8/P6P/7K b KQkq - >> >>Remove black's 2 passed pawns and it still thinks Nxh2 is good with a near draw >>score..Eventually (21 seconds on mine,depth 18) crafty 18.13 sees the loss after >>Nxh2 but there is nothing better.. >> >>I guess the rule does have a problem.. >> >> >>Aaron > >Mine doesn't play Nh2 in the above position. This now becomes a zugzwang >position with no black pawns to move, which turns it into a trivial mate for >white... I guess that it does not play Nxh2 because of tablebases. I wonder what happens when you add a third pawn for white in the a file. Uri
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