Author: Amir Ban
Date: 02:28:19 11/15/98
Go up one level in this thread
On November 15, 1998 at 04:14:51, Ed Schröder wrote: >>You are on the wrong page here. You are not even answering the right questions. >>You may have been influenced by Bob, who's trying to portray this as a primitive >>accusation by people who can't understand simple facts or draw easy conclusions. > >>Briefly: > >>- You discuss the wrong move 37.Be4, while the problem is centered around >>36.axb5. In both these move Qb6 is the apparently right move, but in move 37 it >>doesn't win a pawn, so Be4 is a plausible choice. In move 36 Qb6 definitely wins >>at least a pawn (and axb5 doesn't), so the question is why would a computer not >>play it. You will find, I guess, that yours like any other program wants to play > >>36.Qb6 and can't be persuaded not to. If you find otherwise, tell us because >>that is news. > >Hi Amir, > >I remember in the past we did some analysis with both our programs. I >believe the outcome was: > >In one of the main lines Deep Blue sacrificed 2-3 pawns for a dead wrong >king attack. We came to the conclusion that Deep Blue must have a very >speculative king safety algorithm or the main line was a bug in the king >safety algorithm as in the main line there was no compensation at all to >justify the computer score. > >Maybe you can correct me if there are errors in the above as this is >what I remember from our discussion. > >About move 36. axb5 > >r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - id DEEP BLUE - >Kasparov,G; bm a4b5; > >I have run 36. Qb6 overnight. After 16 plies Rebel10 says: +1.29 >I will run 36. axb5 tonight. > >I understood this is the position you talked about? > > Yes, you got it right. The PV for Deep-Blue on all iterations except the last starts 36.Qb6 Qe7 37.axb5 Rab8 38.Qxa6 e4 39.Bxe4 Qe5. In the last iteration, there's no PV. This is the variation that Kasparov and others talked about. I disagree with your description of the attack as "dead wrong". You give here the "official" computer chess opinion on it. Kasparov and others GM's would maybe play it without hesitation, on an "only chance" basis, and would call it speculative rather than wrong. White is better, but black has a real game going. It is exactly this difference in the computer and human outlook that made Kasparov doubt that the computer played axb5 on its own. Amir
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