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Subject: Re: Very difficult position

Author: Ernst Walet

Date: 06:30:01 07/15/04

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On July 15, 2004 at 00:23:45, Jouni Uski wrote:

>[D]r6r/p2Rbk1p/2p2p2/q6b/8/2N2N1P/P1PP1PP1/2BQ2K1 w - - 0 1 bm Nd5
>
>I think this is by far the most difficult one in Richter's book Kombinationen!
>Shredder 8 takes 26 minutes with 2,4 Ghz PC.
>
>Jouni

Hereby the output of Shredder8.

CPU0: AuthenticAMD x86 Family 6 Model 8 Stepping 1 2200 MHz
GUI: Tablebases with 5 pieces found! [Cache: 64 MB + internal 13.67 MB]
Engine: Shredder 8 (1024 MB)
by Stefan Meyer-Kahlen
  1/02	 0:00 	-1.62--	1.Rxe7+ Kxe7 (2)
  1/02	 0:00 	-1.64 	1.Rxe7+ Kxe7 (7)
  1/03	 0:00 	-0.45++	1.Qe2 Bxf3 2.gxf3 (10)
  1/03	 0:00 	+0.02++	1.Qe2 Bxf3 2.gxf3 (13)
  1/03	 0:00 	+1.19 	1.Qe2 Bxf3 2.Qxf3 (17)
  2/06	 0:00 	-0.33--	1.Qe2 Rhe8 (137)
  2/06	 0:00 	-0.12 	1.Qe2 Rhe8 (177)
  3/07	 0:00 	+0.28++	1.Qe2 Rhe8 2.Qe4 Bxf3 3.Qxf3 (600)
  3/08	 0:00 	+0.69 	1.Qe2 Rhe8 2.Qc4+ Kg7 3.Qxc6 (736)
  4/08	 0:00 	+0.69 	1.Qe2 Rhe8 2.Qc4+ Kg7 3.Qxc6 (1.853) 115
  4/10	 0:00 	+0.73++	1.Qe1 Rhe8 2.Nd4 Rac8 3.Qe6+ Kg6 (2.468) 154
  4/10	 0:00 	+0.96 	1.Qe1 Rhe8 2.Nd4 Qc5 3.Qe6+ Kg7 4.Nxc6 (3.029) 189
  5/14	 0:00 	+1.10 	1.Qe1 Rhe8 2.Nd4 Qc5 3.Qe4 (4.802) 300
  6/14	 0:00 	+1.35++	1.Qe1 Rhe8 2.Nd4 Bg6 3.Nxc6 Qc5 4.Nxe7 Rxe7 (10.933) 352
  6/16	 0:00 	+1.61 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rxe7+ Rxe7
6.Nxe7 Kxe7 (16.483) 350
  7/18	 0:00 	+1.61 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rxe7+ Rxe7
6.Nxe7 Kxe7 (38.262) 407
  8/19	 0:00 	+1.81 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rb7 a5 6.Nxe7
Rxe7 (77.573) 412
  9/20	 0:00 	+1.81 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rb7 a5 6.Nxe7
Rxe7 (121.846) 410
 10/22	 0:00 	+1.82 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rb7 Rac8
6.Nxa7 Rb8 (237.145) 421
 11/24	 0:01 	+1.80 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rxe7+ Rxe7
6.Nxe7 Kxe7 7.Ba3+ Kd7 8.Ne4 (495.168) 422
 12/28	 0:02 	+1.69 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rxe7+ Rxe7
6.Nxe7 Kxe7 7.Nd5+ Kf7 8.Bb2 Rd8 9.c4 (1.228.291) 434
 13/31	 0:07 	+1.77 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rb7 Bg6
6.Nxe7 Rxe7 7.Rxe7+ Kxe7 8.Nd5+ Kd7 9.Nf6+ Kc6 10.Bb2 (3.164.034) 435
 14/35	 0:13 	+1.92 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rb7 Bg6 6.Nb5
Bc5 7.d3 Kf5 8.Nc7 Be7 9.Nxa8 Bf8 10.Nxa7 Rxa8 (5.914.448) 441
 15/40	 0:27 	+1.68 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rd5 Bg6
6.Rxe5+ Kd6 7.Nd5 Bf8 8.d3 Kxc6 9.Nb4+ Bxb4 10.Rc5+ Kxc5 11.Be3+ Rxe3 12.d4+
Kxd4 (12.401.128) 452
 16/38	 1:15 	+1.87 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rd5 Bg6
6.Rxe5+ Kd6 7.Ba3+ Kxc6 8.Bxe7 Bxc2 9.f4 Rg8 10.d4 Kd7 11.g4 Rae8 12.Bc5
(33.691.437) 446
 17/40	 2:04 	+1.94 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Qxe5 fxe5 4.Nxc6 Ke6 5.Rxa7 Rxa7
6.Nxa7 Rf8 7.Nc6 Bh4 8.f3 Rc8 9.Nb4 Kd6 10.Ne4+ (55.206.442) 444
 18/42	 4:31 	+2.19++	1.Qe1 Rhe8 2.Nd4 Qe5 3.Ne4 c5 4.f4 Qb8 5.Nc6 Kf8 6.Nxb8
Bg6 7.Kh2 Bxe4 (119.064.608) 438
 18/42	 5:04 	+2.19 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Ne4 Bg6 4.Nd6+ Qxd6 5.Rxd6 Bxd6
6.Qf1 Rab8 7.f3 Rb1 8.Nxc6 Bxc2 9.Qc4+ Kg7 10.Qg8+ Kxg8 11.Ne7+ Bxe7
(133.773.201) 438
 19/44	10:45 	+2.11 	1.Qe1 Rhe8 2.Nd4 Qe5 3.Ne4 Kg6 4.Nxc6 Qe6 5.Rxe7 Rxe7
6.Nxe7+ Qxe7 7.d3 Kg7 8.Qc3 Bg6 9.Nxf6 Qxf6 10.Bh6+ Kf7 11.Qb3+ Ke8 12.Qg8+ Kd7
(283.722.405) 439
 19/51	23:01 	+2.12++	1.Nd5 cxd5 2.Ne5+ Ke6 3.Qxh5 Rhg8 4.Qf7+ Kf5 (656.234.338)
475
 19/54	29:40 	+2.47++	1.Nd5 cxd5 2.Ne5+ Ke6 3.Qxh5 Rhg8 4.Qf7+ Kf5 5.Rxe7 Rae8
6.Rxe8 Rxe8 7.Qxe8 Qxd2 8.Bxd2 fxe5 9.Kh2 d4 10.Qxe5+ (832.326.237) 467
 19/56	239:33 	+5.43 	1.Nd5 Qxd5 2.Rxd5 Bxf3 3.Qxf3 cxd5 4.Qxd5+ Kg7 5.d4 Rhd8
6.Qe4 Bf8 7.c4 Rab8 8.Bf4 Rb2 9.Bc7 Kf7 10.Bxd8 (6.664.462.129) 463
best move: Nc3-d5 time: 244:58.219 min  n/s: 462.377  CPU 99.6%   n/s(1CPU):
464.233  nodes: 6.795.292.070

Ernst.



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