Author: Robert Hyatt
Date: 07:06:00 08/30/01
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On August 29, 2001 at 23:19:43, Slater Wold wrote: >On August 29, 2001 at 13:14:41, José Antônio Fabiano Mendes wrote: > >> Cray Blitz vs Belle [1981 North American Computer Chess Championship] >> The (in)famous position Dr. Hyatt referred to the other day: >> [D]5r1k/6p1/1n2Q2p/4p3/8/7P/PP4PK/R1B1q3 w >> And here Cray Blitz played 28.Qxb6 >> Source: http://wondersmith.com/rants/howfar.htm > >I understand that CB took only 10 seconds to play, and was limited to 1K nps. >However, I wanted to post this, to show only 1 thing: > >position: > > 8.01 0:00 -0.25 1.Bf4 Qxa1 2.Bxe5 Kh7 3.Qxb6 Qxa2 4.b4 Rf7 5.Qe3 Qb1 >(268.921) 312.3 > 9.01 0:02 -0.18 1.Bf4 Qxa1 2.Bxe5 Kh7 3.Qxb6 Qxa2 4.b4 Rf7 5.b5 Qd5 6.Qb8 >(903.942) 321.2 > 9.03 0:04 -0.17++ 1.Bxh6 Qxa1 2.Qg6 Rg8 3.Bf4 Rb8 4.Bxe5 Rb7 5.Qc6 Kh7 >6.Qxb7 Qg1+ 7.Kxg1 (1.356.976) 321.8 > 9.03 0:04 0.00 1.Bxh6 Qxa1 2.Qg6 gxh6 3.Qxh6+ Kg8 4.Qg6+ Kh8 5.Qh6+ Kg8 >(1.533.066) 325.0 > 10.01 0:07 0.00 1.Bxh6 Qxa1 2.Qg6 gxh6 3.Qxh6+ Kg8 4.Qg6+ Kh8 5.Qh6+ Kg8 >(2.517.038) 332.0 > 11.01 0:27 +0.01 1.Bxh6 Qxa1 2.Qe7 Rg8 3.Be3 Rc8 4.Bxb6 Qxb2 5.Bc7 Qxa2 >6.Bxe5 Qg8 7.Qh4+ Qh7 8.Qg4 (9.074.087) 331.3 > 12.01 1:00 +0.26++ 1.Bxh6 Qxa1 2.Qe7 Rg8 3.Be3 Rc8 4.Bxb6 Qxb2 5.Bc7 Qxa2 >6.Bxe5 Qxg2+ 7.Kxg2 Re8 8.Qxe8+ (19.746.518) 327.1 > 12.01 1:30 +0.68 1.Bxh6 Qxa1 2.Qe7 Rg8 3.Be3 Qb1 4.Bxb6 Qg6 5.Be3 Re8 6.Qd7 >Kg8 7.a4 Qf7 8.Qc6 Kh8 (29.906.848) 331.8 >best move: Bc1xh6 time: 3:04.325 min n/s: 321.286 CPU 98.6% nodes: 59.221.207 > >Deep Shredder here takes a little over 3 minutes, and plays Bxh6. I choose 3 >minutes, because it is a good time for an average tournament move. In 3 minutes >it hits roughly 60M nodes, at a rate of 321K nps. > >If CB had search 60M nodes, it would have taken 987 hours. However, as you can >see in Deep Shredder's eval, it _NEVER_ looks at Qxb6. So the knowledge is in >Deep Shredder. > >Deep Shredder is one of those engines you were talking about earlier; SMK has >tried to balance knowledge and speed. And it seems to work. However, I >searched Nolot #9 for over an hour, I can already tell you, it's no Deep >Thought. Or at least not on an AMD 1.2Ghz. :) > >I believe that Deep Shredder hitting 1M nodes a second, would be _EVIL_. But >even on my 2x1.7Ghz, it still only gets rought 550-650 nps in easy middle game. >(I've seen it hit 1M in pawn endings.) So that's a LONG way off! Perhaps I >need to borrow an 8 way, then things would get interesting! > > >Slate This is incorrect. The first PV you show is 8 plies. I'll bet you a dollar the ply-1 PV has Qxb6. And the ply-2 PV and .... until it realizes it is bad. This is _not_ a "knowledge" problem at all. It is pure tactics and knowledge can be thrown out here. A material-only program will do just as well in this particular case as it is _all_ tactics.
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