Author: Robert Hyatt
Date: 11:11:23 07/22/02
Go up one level in this thread
On July 22, 2002 at 11:52:35, Ed Schröder wrote: >The two you entirely miss the point of Kasparov's suspicion, sigh... > >Lesson 61, now pay attention my pupils :) > >[d]r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - id DEEP BLUE - >Kasparov,G; > >Position before 36.axb5 > >Here DB for a long time showed the following main-line: > >36.Qb6 Qe7 37.axb5 Rab8 38.Qxa6 e4 39.Bxe4 Qe5 40.Bf3 Rcd8 41.Qa7 Qc3 42.Bh5 > >Now let's have a look at the main-line shall we? > >After 39...Qe5 we get: > >[d]1rr3k1/6p1/Q2b1p1p/1P1PqP2/1Pp1B3/2P4P/R5P1/R5K1 w - - > >As you can see black has sacrificed 3 (!!) pawns for a king attack. And this my >pupils is what Kasparov could not believe, a computer sacrificing 3 pawns and so >he started asking questions how that could be. > >The refusal of IBM to answer Kasparov's questions made Kasparov suspicious and >from one thing came another. > >This is *the* heart of the discussion. > >Ed So? If two _current_ programs think axb5 and Qb6 are equal, what do you conclude then? That we all have similar king safety? That we all like the same move (axb5) but for different reasons? you can't _see_ DB's full PV. The last 5-6 plies (plus extensions) are hidden by the hardware, so it might not be that those three pawns are forever sacrificed. All we can therefore conclude is that DB liked axb5 better, fritz says they are equal, Crafty says they are less than .3 pawns different with Qb6 being better for the moment... no big mystery to me... And remember Kasparov had _no_ access to that partial DB pv so he had no idea what it was "thinking".. We know "part of the story" but that is all. And now that we know the two moves are pretty equal by today's programs, there is even less mystery in it...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.