Author: Uri Blass
Date: 23:51:59 12/23/01
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On December 24, 2001 at 00:23:18, Sune Larsson wrote: > > [D]8/k1p5/P7/8/2K4p/1p4rP/6P1/1R6 w - - 0 47 > > > This is a possible position from the first game Gambit Tiger - IM Berg. > While playing out different endings vs Tiger, I stumbled upon this little > intermezzo. Previous moves were: 45.-Nxc4 46.Kxc4 h4 /diagram. > > Tiger here ponders on and plays 47.Rxb3, with an eval of -0.78 - just to > find itself in the misery of -11.36, a single move later... > > I played out this ending on a PIII 800, 192 Mb hash, 1 hour per player. > > Would have made a great testposition, but after the better 47.Kb5 black > just have to find 47.-Rg8! 48.Kc6 Rb8! which also wins. > > For a human it's easy to see that a move like 47.Rxb3 loses quickly for > white, but Tiger - (and maybe other programs) - has clear problems here. I think that it is not so easy for humans to see it and I guess that it took me a minute to see that white is losing by that move (I did not use a clock to find the exact time). I agree that I can see it if I am not in time trouble but humans who do not remember similiar position from previous experience need to calculate and the first line that I calculated was a draw because the white king could get into f3 in time when the black king captures h3. It is important to push the pawn and to continue to push it until the black king is close enough to capture g2 at time. I also had to think about lines when white sacrifies the pawn by g2g3 in order to get a passed pawn but black can capture the white passed pawn and win by the pawns g and c. Uri
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