Position with Shredder 11

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mercury

Position with Shredder 11

Post by mercury »

[d]6k1/6p1/6Pp/ppp5/3pn2P/1P3K2/1PP2P2/3N4 b - - 0 1
How long does it take to Shredder 11 to find the black move 1...Nc3 ?
It didn't find it in 5 min so I wonder if there is a problem with my computer.
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Ovyron
Posts: 4562
Joined: Tue Jul 03, 2007 4:30 am

Re: Position with Shredder 11

Post by Ovyron »

Here it doesn't find it after 10 minutes:

Code: Select all

  1/05	 0:00 	+4.07 	1...c4 2.Kxe4 cxb3 3.cxb3 (12) 0
  1/05	 0:00 	+3.51 	1...a4 2.Kxe4 axb3 3.cxb3 (26) 0
  1/05	 0:00 	-0.21 	1...Nd2+ 2.Kf4 (38) 0
  2/05	 0:00 	-0.06 	1...Nd2+ 2.Kf4 h5 (93) 0
  2/05	 0:00 	-0.20 	1...Nf6 2.Kf4 (127) 0
  3/05	 0:00 	-0.05 	1...Nf6 2.Kf4 Kf8 (199) 0
  4/10	 0:00 	+0.11 	1...Nf6 2.Kf4 Nd5+ 3.Ke5 Nb4 4.c3 (649) 1
  5/10	 0:00 	+0.09 	1...Nf6 2.Kf4 Nd5+ 3.Ke5 Nb4 4.c3 Nd3+ 5.Kd6 (1.298) 2
  6/16	 0:00 	+0.14 	1...Nf6 2.Kf4 Kf8 3.f3 Ke7 4.Ke5 Nd7+ 5.Kd5 (4.379) 6
  6/16	 0:00 	+0.11 	1...Nd2+ 2.Ke2 Ne4 3.Kd3 Nd6 4.h5 a4 5.bxa4 bxa4 (5.025) 7
  7/16	 0:00 	+0.12 	1...Nd2+ 2.Ke2 Ne4 3.Kd3 Nd6 4.h5 Kf8 5.c3 Nf5 6.Ke4 (6.872) 10
  8/18	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 (16.222) 24
  9/14	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (22.020) 31
 10/22	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (76.682) 95
 11/20	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (93.916) 111
 12/28	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (136.279) 144
 13/22	 0:01 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (206.275) 192
 14/26	 0:01 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (309.979) 245
 15/23	 0:01 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (464.160) 300
 16/24	 0:01 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (641.646) 346
 17/29	 0:02 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (957.079) 393
 17/48	10:01 	 0.00++	1...Nc3 (411.234.767) 684  SB:14.498
best move: Ne4-c3 time: 10:01.115 min  n/s: 684.142  CPU 86.9%   n/s(1CPU): 787.275  nodes: 411.234.767 SB: 14.498
It gets stuck searching Nc3. I stopped the analysis and Shredder reports a fail high. Then after restarting the analysis it finds it very fast:

Code: Select all

  1/04	 0:00 	+4.07 	1...c4 2.Kxe4 cxb3 3.cxb3 (8)
  1/04	 0:00 	+3.51 	1...a4 2.Kxe4 axb3 3.cxb3 (19)
  1/04	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (21)
  2/02	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (32) 3
  3/03	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (50) 5
  4/04	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (104) 10
  5/05	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (172) 8
  6/06	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (225) 11
  7/07	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (271) 13
  8/08	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (317) 15
  9/09	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (363) 12
 10/10	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (409) 13
 11/11	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (455) 15
 12/12	 0:00 	 0.00 	1...Nd2+ 2.Ke2 Ne4 3.Kf3 Nd2+ 4.Ke2 Ne4 5.Kf3 (501) 16
 12/27	 0:00 	-3.43 	1...Nc3 2.Ne3 dxe3 3.fxe3 Kf8 4.Kf4 Nd1 5.e4 Nxb2 6.Ke5 Ke7 7.Kd5 c4 8.e5 cxb3 9.cxb3 (251.112) 492
 13/30	 0:00 	-4.18 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.c4 b4 6.h5 Ne4+ 7.Ke3 Nf6 8.Kf4 Nxh5+ 9.Ke5 Ng3 (482.569) 512
 14/33	 0:01 	-4.15 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.c4 b4 6.h5 Ne4+ 7.Ke3 Nf6 8.Kf4 Nxh5+ 9.Ke5 (768.949) 529
 15/31	 0:01 	-4.16 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.c3 Kf8 6.c4 bxc4 7.bxc4 Ke7 8.Ke2 Ng4 9.b3 Kf6 10.h5 Kg5 (904.429) 531
 16/28	 0:02 	-4.35 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.Ke3 Nd1+ 6.Kd2 Nxb2 7.Kc1 Nc4 8.bxc4 b4 9.Kd2 Kf8 10.Kc1 Ke7 11.Kb2 a4 12.h5 (1.189.345) 520  SB:3
 17/28	 0:02 	-4.45 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.Ke3 Nd1+ 6.Kd2 Nxb2 7.Kc1 Nc4 8.bxc4 b4 9.Kd2 Kf8 10.Kc1 Ke7 11.Kb2 a4 12.h5 a3+ (1.468.381) 529  SB:3
 18/31	 0:03 	-4.49 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.Ke3 Nd1+ 6.Kd2 Nxb2 7.Kc1 Nc4 8.bxc4 b4 9.h5 a4 10.Kb2 Kf8 11.Kb1 Ke7 12.Ka2 (1.870.870) 532  SB:3
 19/33	 0:05 	-4.55 	1...Nc3 2.Ne3 dxe3 3.Kxe3 Nd1+ 4.Kd2 Nxf2 5.Ke3 Nd1+ 6.Kd2 Nxb2 7.Kc1 Nc4 8.bxc4 b4 9.h5 a4 10.Kb2 Kf8 11.Kb1 Ke7 12.Ka2 (2.931.716) 541  SB:3
best move: Ne4-c3 time: 0:06.930 min  n/s: 548.893  CPU 93.2%   n/s(1CPU): 588.940  nodes: 3.803.831 SB: 155
Seems like a bug.
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mercury

Re: Position with Shredder 11

Post by mercury »

Yes I had noticed when the search is restarted, shredder 11 finds it very quickly.
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