Author: Sune Larsson
Date: 04:59:00 12/24/01
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On December 24, 2001 at 07:42:59, Uri Blass wrote: >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 But this position wins for black. [D]8/8/2kp4/8/2K4p/7P/6P1/8 b - - 0 1 If the pawn is on the d-file, I wouldn't have been sure of the outcome, when just looking at the position. But with the pawn on the c-file, my eyes told me that the distance between "c" and "g" is too much for the white king. Sune
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