Author: blass uri
Date: 22:53:44 06/23/98
Go up one level in this thread
On June 24, 1998 at 00:07:42, Bruce Moreland wrote: > >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. Junior4.6 on pentium 200MMX find Bh6 after more than 8 hours with evaluation -0.18 Depth 19 line 1.Bh6 a6 2.Bxd7+ Qxd7 3.Bg7 Rg8 4.Qxh7 Rxg7 5.Qxg7 Bf6 6.Qg8+ Ke7 7.Nxe6 Rxg8 8.Nec5+ Kd8 9.Nxd7 Kxd7 10.Nc5+ an interesing alternative is 1.Nxe6 Uri > >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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