Author: Ed Schröder
Date: 02:30:22 02/07/00
Go up one level in this thread
On February 07, 2000 at 02:18:46, James Robertson wrote: >On February 06, 2000 at 13:44:48, Ed Schröder wrote: > >>On February 06, 2000 at 11:18:29, James Robertson wrote: >> >>>On February 06, 2000 at 11:17:02, James Robertson wrote: >>> >>>>On February 06, 2000 at 08:23:59, Howard Exner wrote: >>>> >>>>>[D]6k1/p4p1p/1b2p3/8/PP4p1/6Pn/4K1BP/B7 w - - id Insomniac - Shredder3; bm Nxh3; >>>>> >>>>>The try Nxh3 instead of the move played, Be5, has some merit. Should at least >>>>>draw and a possible win for white may also be hidden here somewhere. Check it >>>>>out. After 1.Nxh3 gxh3 2. a5 Black can try to eventually capture Bxg3 (Bg1 or >>>>>Bc7) but white's advanced queenside pawns will be lurking. Any good defense here >>>>>for black? >>>> >>>>I was horrified in the way my program completely bungled this position. I am >>>>certain there is a win for black somewhere, and at the worst a draw. >>> >>>er, white. >> >>I think you are right. My thing also confirms your feeling: >> >>00:00:05 10.00 -0.14 1.a5 Ng1+ 2.Kd3 Bf2 3.b5 Nf3 4.b6 >> Nxh2 5.bxa7 (4) >> >>00:00:09 11.00 -0.22 1.a5 Ng1+ 2.Kf1 Be3 3.b5 Nf3 4.h3 >> Bd4 5.Bxf3 Bxa1+ 6.Bxg4 f5 7.Bf3 >> e5 (7) >> >>00:00:18 12.00 -0.22 1.a5 Ng1+ 2.Kd3 Bf2 3.Bd4 Bxd4 4.Kxd4 >> Nf3+ 5.Bxf3 gxf3 6.Ke3 f5 7.Kxf3 >> e5 8.h3 Kf7 9.b5 Ke6 10.Ke3 (14) >> >>00:00:43 13.00 -0.24 1.a5 Ng1+ 2.Kf1 Be3 3.b5 h5 4.Bb2 >> Nf3 5.h3 Bc5 6.hxg4 hxg4 7.Ke2 Nd4+ >> 8.Bxd4 Bxd4+ 9.Kd3 (31) >> >>00:02:08 14.00 0.19 1.a5 Bg1 2.Be5 Bxh2 3.b5 Bg1 4.Bc7 >> f5 (72) >> >>00:04:22 15.00 0.46 1.a5 Bg1 2.Be5 Kf8 3.b5 Ke7+ 4.Bc7 >> Bd4 5.b6 Kd7 6.Bxh3 gxh3 7.Be5 axb6 (162) >> >>The rise of the score is remarkable. >> >>Ed >> > >Insomniac requires 15 ply to realize that a5 is best. It still doesn't evaluate >it as good for white, though. Ironically, it searched 14 ply before deciding on >its move. > >Obviously you are doing some better extensions/scoring here than I am. What >extensions would you suggest to improve Insomniac's evaluation/search of this >position? I think the bishop-pair + seeing the b-passer appearing in the search does the a5 trick in this position. Ed >James > >> >>>>Shredder's score went from +0.04 (even though it is a pawn up) to +0.96 after >>>>Be5. Insomniac's first preference (Bxh3) is obviously better, and Shredder's >>>>predicted a5 is probably the best. >>>> >>>>James
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