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Subject: Re: GM Christiansen's rook sac from today's US Championship. Unsound?

Author: Richard A. Fowell

Date: 21:37:55 01/06/02

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After a brief look (2 hours @ 867 MHz, 5 billion nodes)
MacChess thinks pretty much the same, as Tiger from 11 to 16 ply.
The MacChess PV matches the Tiger PV for the first 13 ply.

[D]r1k4r/pp1n2bp/2p1Q1p1/1q4B1/3P4/2P2N1P/PP3PP1/R5K1 w - - 2 17

The MacChess continuation at 16 ply:

1.  Qf7   Bf6
2.  Bxf6  Qf5
3.  Ne5   Nxf6
4.    g4  Nxg4
5.  hxg4  Qxf7
6.  Nxf7  Rf8
7.  Re1    h5
8.  gxh5  gxh5
9.  Nd6+  Kc7
10. Ne4

Log file follows.

Richard A. Fowell

====================================================
05/22|00:00:00|      100901| -276| Re1 Rf8 Qe8+ Rxe8 Rxe8+ Kc7 Rxa8 Qxb2 etc.
05/34|00:00:00|      131718| -254| Qf7 Bf6 Bxf6 Qf5 d5 Nxf6 dxc6 bxc6
06/01|00:00:00|      181192| -254| Qf7 Bf6 Bxf6 Qf5 d5 Nxf6 dxc6 bxc6
07/01|00:00:00|      288548| -301| Qf7 Bf6 Bxf6 Rf8 Qxh7 Qxb2 Re1 Rxf6
07/02|00:00:01|      726355| -270| b3 Rf8 Qe7 Rg8 Qf7 Qd5 Qxd5 cxd5
07/23|00:00:02|     1356968| -264| Re1 Qd5 Qxd5 cxd5 Bh4 Bf6 Bxf6 Nxf6 Ne5
08/01|00:00:04|     2621714| -263| Re1 Qd5 Qxd5 cxd5 Re7 Rg8 a3 h6 Bf4
09/01|00:00:07|     5004796| -263| Re1 Qd5 Qxd5 cxd5 Re7 Rg8 Bf4 h5 Ne5 Bf6
10/01|00:00:14|    10011393| -263| Re1 Qd5 Qxd5 cxd5 Bf4 Rg8 Re7 h5 Be5 Bh8 b3
11/01|00:01:06|    45879433| -244| Re1 Qd5 Qxd5 cxd5 Re7 Rg8 Bf4 h5 Ne5 Nb6 etc.
11/02|00:01:21|    56292719| -169| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Qf4 Qe6+ Kc7
Qf7+ Kd8 Qxb7
12/01|00:02:06|    87445375| -130| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Nxg4 hxg4 Qxf7
Nxf7 Rf8 Nd6+ Kc7 Ne4
13/01|00:04:33|   189896369| -125| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Nxg4 hxg4 Qxf7
Nxf7 Rf8 Re1 h5 Nd6+ Kc7
14/01|00:12:57|   540920201| -130| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Nxg4 hxg4 Qxf7
Nxf7 Rf8 Re1 h5 Ne5 Re8
15/01|00:38:35|  1580408463| -132| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Nxg4 hxg4 Qxf7
Nxf7 Rf8 Re1 h5 gxh5 gxh5 Nd6+ Kc7
16/01|02:05:58|  5029329783| -131| Qf7 Bf6 Bxf6 Qf5 Ne5 Nxf6 g4 Nxg4 hxg4 Qxf7
Nxf7 Rf8 Re1 h5 gxh5 gxh5 Nd6+ Kc7 Ne4



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