Author: Uri Blass
Date: 12:01:43 11/09/05
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On November 09, 2005 at 14:36:07, Uri Blass wrote: >On November 09, 2005 at 13:03:43, Dann Corbit wrote: > >>Following up on an idea from Uri Blass about analyzing positions after the key >>move has been made, I did another look at the hard positions posted recently. >> >>Given the following test set, which is taken from the vhard test set posted >>yesterday AFTER the key move has been made, it appears that some of the problems >>are (or may be) busted. Each problem should have a large and negative score >>after deep analysis and yet some of them are clearly winning. > >The only position that you may consider as refuted is the position with Nf6+ and >even this is not refuted if you look at the following post that explained the >solution > >http://www.talkchess.com/forums/1/message.html?460352 > > >solution is hard to find for chess programs and top chess programs simply prune >so much that they cannot find the idea even after the correct move. > >It is easy to use yace for retrogrede analysis of the relevant position to show >that white is winning. > >Uri Note that in the case of this problem there are some moves in the pv that are hard to find [Event "4320'/1"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "New game"] [Black "?"] [Result "*"] [SetUp "1"] [FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1"] [PlyCount "9"] [TimeControl "1/259200:0/0:0/0"] 1. Nf6+ Kg7 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Nf7+ 5. Ke6 * Not only 1.Nf6+ is hard to find but also 3.Bc2+ and 4.d8=Q It is espacially correct for fruit that has no mate extensions. Uri
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