Author: Sune Larsson
Date: 04:10:48 12/24/01
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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 >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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