Author: blass uri
Date: 21:29:31 12/10/98
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On December 10, 1998 at 23:22:18, Robert Hyatt wrote: >On December 10, 1998 at 17:11:03, blass uri wrote: > >> >>On December 10, 1998 at 16:34:20, Georg Langrath wrote: >> >>>In the begining chesscomputers never made real sacrifices for position. Super >>>Constellation was the first chesscomputer that was able to do that. >>> >>>Dear members of CCC. Have you nice examples of genuine sacrifices from your >>>chesscomputers? They are nice to look at, and it is interesting to examine if >>>other programs make the sacrifice. Of course all sacrifices are not healthy, but >>>they are always nice to look at, especially from chesscomputers. >>> >>>Please answer this notice with sacrifices from your computers. I think we all >>>like to examine them. >>> >>>Georg >>8/4kp2/r3p1p1/2p4p/2Nb1P2/1PpP1KP1/1rP1R2P/4R3 b - - 0 1 >> >>This position is from mclane's tournament >> >>Fritz5(16 bit) played against Genius5 >>Raa2(an impressive positional sacrifice) and Genius5 played Nxb2 and I think it >>is the losing mistake. >>Fritz5 can find Rc1 and I think that it is enough for doing a draw. >> >>Uri > > > >This really isn't a positional sacrifice at all. IE if you let crafty search >this position it likes Rba2 to move the rook away, after 30 seconds and 13 plies >eval is +.04... if you force it to search only Raa2, after the same depth the >score is +.02... and from 2 plies on it doesn't think Nxb2 is the best move... > >So this is "just a move" and not anything spectacular, IMHO... It is a positional sacrifice because Nxb2 is typical to computers. Fritz5 did not see a forced win of material after Nxb2 and I think that the same hold for crafty. computers also can play Rc1 because they want to play Nxb2 next move after Rc1 Ra7 the move Nxb2 is also a mistake. black can win by puting the rook at a1 and the king at a2 but this is too far to see for computers The only reason to play Raa2 is positional(black cannot lose even if black does not choose the right plan). I guess that a passed pawn in the 7th rank and other positional factors were enough for the material. Uri
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