Author: Ernst A. Heinz
Date: 11:48:06 11/07/98
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On November 07, 1998 at 11:59:08, Hans Havermann wrote: >On November 06, 1998 at 00:26:37, James Robertson wrote: > >>After 1. Bf6 gxf6 2. Qxh6, I don't see any way Black can win: > >For what it's worth, here's my 24-hour MacChess analysis after 1. Bf6. Of >interest is that, at depth 15, black chooses to ignore the bishop (by a couple >of points). > >4rrk1/ppp2pp1/2qp1B1p/2n5/2P1PQ2/3P4/P1P3PP/R4RK1 b - - > >06/01|00:00:01| 122403| +184| gxf6 Qxh6 Nd7 Qe3 b6 Qg3+ Kh7 Rab1 >07/01|00:00:02| 422147| +182| gxf6 Qxh6 Nd7 Qe3 b6 Rab1 a5 h3 >08/01|00:00:04| 1107785| +182| gxf6 Qxh6 Nd7 Qe3 b6 Rab1 a6 h3 a5 >09/01|00:00:20| 5731120| +106| gxf6 Rf3 Nxe4 dxe4 Qc5+ Kh1 Kh7 Rb1 b6 Qf5+ > Qxf5 exf5 >10/01|00:00:44| 13115112| +100| gxf6 Rf3 Ne6 Qxh6 Qc5+ Kh1 Qd4 Qxf6 Qxf6 Rxf6 > Nd4 Rb1 b6 >11/01|00:04:30| 81404166| +96| gxf6 Qxh6 Ne6 Qxf6 Qc5+ Qf2 Qxf2+ Rxf2 b6 Rb1 > a5 h3 Nd4 a4 >12/01|00:14:26| 259223286| +96| gxf6 Qxh6 Ne6 Qxf6 Qc5+ Qf2 Qxf2+ Rxf2 > Re7 Rb1 b6 h3 Rfe8 a4 Nd4 >13/01|00:39:13| 673769583| +96| gxf6 Qxh6 Ne6 Qxf6 Qc5+ Qf2 Qd4 Rab1 b6 h3 > a5 a3 Qxf2+ Rxf2 Nd4 c3 >14/01|01:50:05| 1898441876| +96| gxf6 Qxh6 Ne6 Kh1 Qc5 Rab1 Qg5 Qxf6 Qxf6 Rxf6 > b6 h3 a5 c3 Nc5 Rf3 >15/01|08:42:05| 8779767089| +61| gxf6 Qxh6 Nxe4 dxe4 Qc5+ Kh1 Qg5 Qxf6 > Qxf6 Rxf6 Rxe4 c5 dxc5 h3 b6 Raf1 a5 c3 >15/11|15:45:20| 15665767393| +64| Ne6 Qg4 b5 Rf3 bxc4 Rg3 g6 Qh4 Qc5+ Kh1 > Kh7 e5 Ng7 Bxg7 Kxg7 exd6 cxd3 d7 > >16/01|23:59:43| 22377771330| n/s: 259052 Nice position -- "DarkThought" agrees with "MacChess" but switches to Ne6 already in iteration #10. The log of a 500MHz Alpha-21164a run follows below. ----- 00:00:00 6.01 gxf6 Qxh6 Nd7 Kh1 Qa4 c3 =131 =1.02 #74215 00:00:00 7.01 gxf6 Qxh6 Nd7 Rf3 Qc5+ Kh1 Re5 d4 =1.02 #193858 00:00:02 8.01 gxf6 Qg4+ Kh8 Rxf6 Re6 Qf4 Rxf6 Qxf6+ Kh7 =0.72 #473848 00:00:05 9.01 gxf6 Qxh6 Nd7 Rf3 Qc5+ Kh1 Re5 Rh3 Qa5 Rb1 <=0.47? #1229436 00:00:08 9.01? gxf6 Qxh6 Nxe4 dxe4 Qxc4 Qxf6 Qxe4 Rf3 c5 Qxd6 =0.30 #1833563 00:00:20 10.01 gxf6 Qxh6 Nxe4 dxe4 Qxc4 Qxf6 Re6 Qf2 Rxe4 Qxa7 =0.24 #4370684 00:00:27 10.05 Ne6 Qg3 Kh7 Bc3 b5 Qf2 bxc4 Qf5+ Kh8 Rac1 >=0.25! #5760540 00:00:49 11.01 Ne6 Qg4 b5 cxb5 Qxc2 a4 Qxd3 Rf3 Qe2 Rg3 =0.37 #10523227 00:01:30 12.01 Ne6 Qg4 b5 cxb5 Qxc2 Qg3 Qc5+ Kh1 Kh7 Rf5 =0.38 #19486693 00:04:10 13.01 Ne6 Qg4 b5 Rf3 bxc4 Rg3 Qb6+ Kf1 Ng5 Bxg5 =0.23 #52552675 nps=208787 time=00:06:00 nodes=75184739 Best move Ne6 from iteration 13 has score 30 (0.23). Best reply is Qg4. ----- =Ernst=
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