Author: José de Jesús García Ruvalcaba
Date: 16:10:50 05/17/99
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On May 17, 1999 at 17:08:06, Francis Monkman wrote: >Analyzing a good number of GM games using a computer, one clearly finds >examples of flawed analysis. On the other hand, one (perhaps as often) >finds examples where it could be said that the computer 'simply doesn't >understand the position', and sees advantage for an already-losing side. >I'm surprised that a strategic principle (ie let your opponent think he's >winning) practised throughout history by human players should prove so >hard (at least at the moment) to conceive against 'the machine'. > >A good, simple example of why never to take computer analysis for granted: > >Play into any engine the following moves: 1. g3 d5 2. Bg2 c6 3. Nf3 Bg4 >4. c4 e6 5. b3 and watch the analysis for a while. I'd be surprised if a >clear advantage to Black isn't registered, probably with ...dxc4 as the >chosen continuation -- most programs would perhaps play this at 40/2? >(Rebel10 no exception, at 200MHz, although the advantage it gives Black >is much less than some programs -- about +0.20. Some register >+1.00.) > >Now walk it through the following: 5. ...dxc4 6. bxc4 Bxf3 7. Bxf3 Qd4 >8. Qb3 and while the analysis of...Qxa1 initially resembles a Rottweiler >with a sausage, most programs calm down after a little and prefer ...Qd7 >or even ...Nd7 (probably best, but still with an excellent game for White). >After 8. ...Qxa1, of course, 9. Qxb7 gives White a clear advantage. > >Well, I suppose that's why we give computers opening books -- but then I >guess we all know Deep Blue shouldn't really have won with a 'look-up' sac. > >[This is from an interesting game, Ubilava-Gurgenidze Tbilisi,1971 [Gufeld], >where Black played 5. ...Nd7 and after a hard struggle with several winning >chances missed by White, Black lost on time with a winning position!] > >Francis I won a game against an engine from that position! I reached it with a different move order. I do not remember against which engine, I think it was against Faile but I am not sure. I will look for the game you mention, my interest has been awakened. José.
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