Author: Robert Hyatt
Date: 19:02:09 03/28/02
Go up one level in this thread
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...
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