Author: Uri Blass
Date: 00:38:12 03/29/02
Go up one level in this thread
On March 28, 2002 at 22:02:09, Robert Hyatt wrote: >On March 27, 2002 at 11:44:46, Uri Blass wrote: > >>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 > > >No idea... but so long as black has something besides the king, this is a >draw... Not exactly It seems that if black has 2 connected pawns then it is a draw but one pawn does not mean a draw because white can first capture the pawn and later win by zunzwang. Uri
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