Author: James Robertson
Date: 23:18:46 02/06/00
Go up one level in this thread
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? 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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