Author: Howard Exner
Date: 01:29:53 01/08/99
Go up one level in this thread
On January 07, 1999 at 19:20:12, blass uri wrote: > >On January 07, 1999 at 15:24:03, Howard Exner wrote: > >>On January 07, 1999 at 00:41:19, blass uri wrote: >> >>>>61. Kd6 d4 >>>>62. Ke7 Ba4 >>> >>>chessmaster could play 62...d3 and do a draw after 63.Kf8 d2 64.Ne4 d1=Q 65.Nd6 >>>Qxd6+ 66.exd6 Ba4 67.Ke7 Kg8 68.d7 Bxd7 69.Kxd7. >> >>This line as you say leads to a draw but why should white take this route? >>Black is in such a terrible state, his bishop being not worth much more than a >>pawn in this position. Can't white simply play 63. Ne4 in reply to d3, then >>march his king back to pick up the d pawn. The game would then take a similar >>course to the actual game as played out by these two programs. The Knight here >>is totally dominant and should not be so willing to give up its life for >>a measly pawn. >> >>> >>>white takes the pawn at e6 but it is a draw. >>>chessmaster needs many hours to find 62...d3 because of wrong evaluation of this >>>pawn ending. >> >>But would lose just the same if Fritz does not play the drawing Kf8. >>As always in chess I'm never 100% sure of my own analysis so if there >>is some intricate draw line that I am missing please let me know and I'll >>humbly retract my claim that black is completely lost. > >You are right that black is lost after 62...d3 63.Ne4 but I think that >Fritz5.32 will play 63.Kf8(I do not know because I do no have Fritz5.32 but at >least Fritz5.16 cannot find 63.Kf8 in 15 minutes on my pentium200MMX. > >and fritz is closer than Junior or chessmaster to understanding that the KPPPvs >KPP is a draw. >It evaluates this only as 1.xx and not as 2.xx pawns advantage for white. This turns out to be a very difficult position for computers as you say. I tested Rebel 10 by first entering in the move 62 ... d3 to see if it might reject Kf8 in favour of Ne4. No such luck, it seems way too deep for Rebel to follow. I posted another thread related to this ending asking how or if programs will ever come to solve these kind of positions.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.