Author: Ed Schröder
Date: 00:56:23 05/21/00
Go up one level in this thread
On May 20, 2000 at 20:37:13, Robert Hyatt wrote: >On May 20, 2000 at 10:04:58, Ricardo Gibert wrote: > >>On May 20, 2000 at 09:27:39, Robert Hyatt wrote: >> >>>On May 20, 2000 at 07:11:31, Terje Vagle wrote: >>> >>>>1r6/5kp1/RqQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 b - - >>>> >>>>After 45. Ra6, Fritz suggests Qe3 for black and evaluates the position as 0,94. >>>>It does not seem to find the famous draw-line for Kasparov. >>>>10 hours analysis on PIII-600, and 28006383 KN evaluated >>>> >>>>Does any other program find the draw-line? >>>> >>>> >>>>Regards >>>> >>>> >>>>Terje >>> >>>The draw is somewhere around 60 plies deep, total. I don't think anyone is >>>going to find that. >> >>60 plies? No way. More like half that. A lot of humans have no trouble >>calculating the draw to the end. I found it myself without any assistance of any >>kind. The only thing difficult about that draw is the psychological barrier. >>This Kaspy failed to overcome as we all know. > > >Go to Ed's web site. He had the analysis posted there. There are some very >tricky lines that do extend to 60 plies. Humans had _great_ difficulty finding >this... it took hours. With computers helping... I found it, here is the quote: Ed _______________________________________________________________________ [ begin ] Analysing this with Rebel we tried to find out the longest defense till the draw (repetition) would be found. Well it is at least 36 plies. Even for DB super machine that's too much. The line goes like this: 45.Ra6? Qe3! 46.Qxd6 Re8! 47.h4! h5! 48.Bf3 Qc1+ 49.Kf2 Qd2+ 50.Be2 Qf4+ 51.Kg1 Qe3+ 52.Kh2 Qf4+ 53.Kh3 Qxf5+ 54.Kh2 Qf4+ 55.Kg1 Qe3+ 56.Kf1 Qc1+ 57.Kf2 Qf4+ 58.Ke1 Qc1+ 59.Bd1 Qxc3+ 60.Kf1 Qc1! 61.Ke2 Qb2+ 62.Kf1 Qc1 Note 60..Qc1! It's a (quiet) non checking move. Perhaps the reason why no program can find 45..Qe3 with a draw score? [ end ] >>As for computer programs, judging from the Chris Janeke post, commercial >>programs have no trouble finding the draw with a 5 ply headstart. If it were >>really 60 plies, I don't see how that would be possible. > > > >I don't know of any program that can find a draw with a 5 ply start. But I >suppose it is possible. It is _very_ deep.
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