Author: Bruce Moreland
Date: 21:07:42 06/23/98
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On June 23, 1998 at 18:25:49, Amir Ban wrote: >The critical line is: > >1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7! 4.Nc5+ Ke8 5.Qd7+ Kf7 6.Nxb7 Rc7 7.Nd6+ Kg7 >8.Ne8+ Rxe8 9.Qxe8 Nf6! > >The rook sac is not at all speculative. It's just wrong. Your eval should be a >significant plus for white at at least two points in it, but this doesn't hold >because black has these counter-resources. Black has only one defense, but it >works. The hard part for black is seeing 3...Kxd7. 3...Kf7 is a dead loss. All times on a Pentium Pro 200. What happens when I run this from the root is I get Bh6 in under a second, at about -0.8, holding for about 3.5 minutes, until in ply 10 Rxe6 fails high, and the re-search fails low. I just ran this one for five minutes, so I don't know what happens later. If I force Rxe6, and search on the resulting position (I didn't think to do this earlier), the program wants to play fxe6 (about +1) for about a minute, then something bad happens, it goes down to -0.6, and a few seconds finds Rc7, which is about zero, and which it wants to play until a little before six minutes. Then it fails high on fxe6 again in ply 10, with a score of +1.7, and it goes up from there. >>My own analysis shows a nasty check or two, then black is simply up material. >> > >No, there's more to it as you can see in the line. I don't understand how your >program can dismiss this line without passing through intermediate depths where >it would think it works. I think I lucked out a little bit. bruce
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