Author: Uri Blass
Date: 04:42:59 12/24/01
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On December 24, 2001 at 07:10:48, Sune Larsson wrote: >On December 24, 2001 at 02:51:59, Uri Blass wrote: > >>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 > > > Okey, I reasoned like this. "After the takings on b3 there is a pawn ending. > If I remove the 3 pawns on the king's side it's a draw - coming stalemate. > But in the above position white sometimes must play g4 or g3 and black takes > and promotes." Why calculate specific variations? > > Sune If you do not use previous knowledge about similiar positions you have to calculate in order not to get into the wrong conclusion. if the pawn is on the d file and not on the c file then it is a draw [D]8/4k3/3p4/8/2K4p/7P/6P1/8 b - - Uri
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