Author: blass uri
Date: 22:04:32 06/09/00
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On June 09, 2000 at 19:14:52, Oliver Roese wrote: >On June 09, 2000 at 15:11:00, blass uri wrote: > >>On June 09, 2000 at 13:59:44, blass uri wrote: >> >>>On June 09, 2000 at 12:11:16, Ernst A. Heinz wrote: >>> >>>>>[D]8/8/Pk5K/2p5/2P1pp2/8/5P1P/8 w - - 0 1 >>>>> >>>>>Programs cannot see at evaluation time that black is winning because of >>>>>unstoppable pawn. >>>>> >>>>>If I give them to analyze at 1 ply depth they give a big advantage for white. >>>> >>>>What do you mean by "big advantage"? >>>> >>>>"DarkThought WCCC'99" knows about White's unstoppable passed Pawn >>>>on h2 and it also knows about the potential breakthrough of the >>>>two Black Pawns on e4 and f4. Both somehow cancel each other out >>>>in the static evaluation such that the overall score is just the >>>>+1 material advantage of White. >>>> >>>>=Ernst= >>> >>>Some other programs gave more than +2 for white and in one of the cases(I think >>>it was hiarcs7.32) they gave even about +7 pawns at 1 ply depth. >>> >>>Uri >> >>Here are some scores of chess programs at depth 1 >> >>chessmaster6000(7.21) >>Hiarcs7.32(7.18) >>Fritz5.32(6.16) >>Genius3 depth 1 with selective search=0(5.39) >>Rebel century1.2a(4.36 and the score at depth 2 is even 7.76 and only at depth 3 >>becomes negative) >>Junior5.9 (3.41) >>Crafty17.10(2.97) >>CometB20(2.80) >>CometB11(2.20) >>Junior4.6 (1.78) >>Exchess2.51(0.79) >> >>No program can see that white is losing at evlauation time or even at depth 1 >> >>Uri > >How would a human look at the position? >It would notify that both white and black have unstoppable passers/candidates >and a directed search is required to see, who is the winner. It is easy to see without a directed search that the black pawn will win because it is more closer to the queening square by more than one square. >"Deep Thought" evaluates it this way, but the others fail. I do not know about deep thought but tal does not fail to evaluate this position. Uri
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