Author: Ricardo Gibert
Date: 16:36:27 05/28/03
Go up one level in this thread
On May 28, 2003 at 14:55:10, Robert Hyatt wrote: >On May 28, 2003 at 11:17:00, Ricardo Gibert wrote: > >>On May 28, 2003 at 11:00:06, Robert Hyatt wrote: >> >>>On May 28, 2003 at 00:57:00, Ricardo Gibert wrote: >>> >>>>On May 28, 2003 at 00:10:32, Robert Hyatt wrote: >>>> >>>>>On May 27, 2003 at 19:11:49, Jorge Pichard wrote: >>>>> >>>>>>After being completely out-played for the entire game, and with imminent defeat >>>>>>on the horizon, Kasparov resigned the 2nd game rather than drag out the >>>>>>humiliation. But Deep Blue had made a critical error, allowing Kasparov a >>>>>>perpetual check. The analysis is quite deep and extends slightly beyond Deep >>>>>>Blue's search horizon. And, apparently, also Kasparov's. Kasparov's team, which >>>>>>included Grandmaster Yuri Dokhoian and Frederic Friedel, were faced with the >>>>>>delicate task of revealing the news to Kasparov. They waited until lunch the >>>>>>next day, after he had had a nice glass of wine to drink. After they revealed >>>>>>the hidden drawing resource, Kasparov sunk into deep thought (no pun intended) >>>>>>for five minutes before he conceded that he had missed a draw. He later claimed >>>>>>that this was the first time he had resigned a drawn position. >>>>>> >>>>>>Six years later, which program can see the draw in the famous 2nd game of the >>>>>>rematch? >>>>>> >>>>>>Jorge >>>>> >>>>> >>>>>NO program sees this. It is about 60 plies deep. It is unlikely that a >>>>>program will see it for quite some time to come, in fact... >>>> >>>> >>>>Whenever this comes up, you always say "about 60 plies", but I can't find >>>>anything to corroborate this. Let's see your analysis. >>> >>>The best analysis I specifically remember was posted on Ed's web site a few >>>years ago. I didn't save it as it was not particularly "interesting" to me. >>> >>>It might still be available however... >> >> >>http://www.rebel.nl/db2.htm >> >>He only gives 36 plies. A far cry from "about 60 plies" > > >OK... then that may not be the deepest drawing line. > >However, he does point out the difficulty of finding one particular non-checking >move way deep into the tree... While one could argue whether or not a program like Yace or Fritz can actually "see" the draw from the root position, there is little question that they would actually "play" the draw. This is an easy experiment to perform and you will find this includes the move you allude to. There is a more interesting experiment that I would like to see Yace perform. It would require modification to the program, however. That is to have it perform a test to see if the position after the ...Qc1 move occurs plus to verify that it correctly evaluates it. BTW, I think this type of test should be a standard feature of programs that can be turned on/off. How else to know to determine with a high degree of confidence whether a program "understands" a given position or not?
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