Test Position - Nxg5

[tmokonen]

[D]r2q1rk1/pbp2p2/1pnp1n1p/4p1p1/2PPP2B/P1PB1N2/5PPP/R2Q1RK1 w - - 0 1

Rybka 1.2n (256 MB hash)
2 00:00 216 4.608 +0.06 Bh4g3
3 00:00 584 7.569 +0.19 Bh4g3
4 00:00 1.896 17.491 +0.19 Bh4g3 Nf6h5
5 00:00 2.960 21.345 +0.19 Bh4g3 Nf6h5 h2h3
6 00:00 5.064 29.974 +0.18 Bh4g3 Nf6h5 h2h3 Nh5xg3
7 00:00 15.640 40.855 +0.19 Bh4g3 Nf6h5 h2h3 Nh5xg3 f2xg3 e5xd4 c3xd4 Qd8f6
8 00:01 30.136 45.853 0.00 Bh4g3 e5xd4 c3xd4 g5g4 d4d5 g4xf3 d5xc6 f3xg2 c6xb7 g2xf1Q+ Qd1xf1 Ra8b8
9 00:01 42.488 48.775 0.00 Bh4g3 e5xd4 c3xd4 g5g4 d4d5 g4xf3 d5xc6 f3xg2 c6xb7 g2xf1Q+ Qd1xf1 Ra8b8 Qf1g2
10 00:01 67.536 51.417 +0.02 Bh4g3 e5xd4 c3xd4 g5g4 d4d5 g4xf3 d5xc6 f3xg2 c6xb7 g2xf1Q+ Bd3xf1 Ra8b8 e4e5 d6xe5
11 00:04 196.720 52.816 +0.18 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 Nf3d2 Nc6xd4 f2f3 g4g3 Bh4xg3
12 00:06 304.784 55.014 +0.16 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 Nf3d2 Nc6xd4 f2f3 g4g3 h2xg3 Bb7c6
13 01:06 3.824.472 58.792 +0.22 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Nf6d7 Qd1e2 Nd7c5 Bd3c2 Qd8d7 h2h3
14 01:38 5.606.096 58.642 +0.25 Bh4g3 Qd8e7 h2h3 Nf6h5 Bg3h2 Nh5f4 Bh2xf4 g5xf4 Qd1d2 Kg8g7 d4d5 Nc6a5 Ra1b1
15 02:22 8.161.328 58.595 +0.24 Bh4g3 Qd8e7 Rf1e1 Ra8d8 d4d5 Nc6a5 Nf3d2 Nf6d7 Bd3e2 Nd7c5 Qd1c2 Bb7c8 h2h3
16 03:35 12.592.536 59.883 +0.22 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Nf6d7 Qd1e2 Nd7c5 Bd3c2 Qd8f6 h2h3 Bb7c8 Ra1b1 Kg8g7
17 05:49 21.052.104 61.754 +0.21 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Nf6d7 Qd1e2 Nd7c5 Bd3c2 Qd8f6 Ra1b1 Bb7c8 f2f3 Bc8d7
18 13:21 46.988.320 60.082 +0.22 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Nf6d7 Ra1b1 Nd7c5 Bd3c2 Qd8f6 f2f3 Bb7c8 Bg3f2 Bc8d7
19 22:58 83.234.712 61.826 +0.20 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Nf6d7 Ra1b1 Nd7c5 Bd3c2 Qd8f6 f2f3 Bb7c8 Bg3f2 Bc8d7
20 44:16 157.700.264 60.802 +0.19 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 c7c6 Qd1e2 Ra8c8 Rf1c1 Nf6d7 f2f3 Nd7c5 Bd3c2 Qd8d7
21 1:40:59 372.294.840 62.922 +0.18 Bh4g3 Rf8e8 Rf1e1 e5xd4 c3xd4 g5g4 d4d5 g4xf3 d5xc6 Bb7xc6 Qd1xf3 Nf6d7 Bd3c2 Qd8g5
22 7:11:51 1.436.747.472 56.779 +0.21 Bh4g3 Rf8e8 Rf1e1 Kg8g7 h2h3 Nf6h5 Bg3h2 Nh5f4 Bh2xf4 g5xf4 Ra1b1 Qd8f6 Bd3c2 Re8e7
22 14:39:08 2.901.920,640 56.335 +0.67 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Kg8g7 Bh4g3 Nf6h5 Ra1b1 Ra8b8 Rb1b2
23 16:59:34 3.311.820,720 55.436 +0.66 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Kg8g7 Bh4g3 Nf6h5 Ra1b1 Ra8b8 Re1e3 Nh5xg3
24 18:51:55 3.680.396,856 55.491 +0.67 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Kg8g7 Bh4g3 Nf6h5 Ra1b1 Ra8b8 Re1e3 Nh5xg3
25 31:51:16 5.928.966,656 52.942 +0.65 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Kg8g7 Bh4g3 Nf6h5 Ra1b1 Ra8b8 Re1e3 Nh5xg3

Bright 0.3a (256 MB hash)
1/4 00:00 21 21 +0.15 d4xe5 Nc6xe5 Nf3xe5 d6xe5
1/4 00:00 32 32 +0.65 Bh4g3
2/17 00:00 888 55 +0.10 Bh4g3 g5g4 d4xe5 g4xf3 e5xf6 f3xg2
2/17 00:00 1.096 68 +0.15 d4xe5 Nc6xe5 Nf3xe5 d6xe5
3/17 00:00 1.326 82 +0.15 d4xe5 Nc6xe5 Nf3xe5 d6xe5
4/17 00:00 2.937 183 +0.01 d4xe5 Nc6xe5 Nf3xe5 d6xe5 Bh4g3 Bb7xe4 Bd3xe4 Nf6xe4 Bg3xe5
4/17 00:00 4.697 146 +0.13 Bh4g3 g5g4 d4xe5 g4xf3 e5xf6 f3xg2 Qd1g4+ Kg8h7
5/17 00:00 6.463 201 +0.03 Bh4g3 e5xd4 Qd1c2 d4xc3 Qc2xc3
6/19 00:00 17.012 270 -0.25 Bh4g3 e5xd4 Qd1c2 d4xc3 Qc2xc3 g5g4 Nf3h4
7/19 00:00 33.003 351 -0.25 Bh4g3 e5xd4 Qd1c2 d4xc3 Qc2xc3 g5g4 Nf3h4
8/22 00:00 108.667 462 -0.15 Bh4g3 e5xd4 Nf3xd4 Nc6xd4 c3xd4 Bb7xe4 f2f4 Rf8e8 f4xg5 h6xg5 Qd1b3
9/24 00:00 236.442 487 -0.28 Bh4g3 e5xd4 c3xd4 g5g4 d4d5 g4xf3 d5xc6 f3xg2 c6xb7 g2xf1Q+ Qd1xf1
10/27 00:01 469.122 508 -0.11 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 e4e5 d6xe5 d4xe5 Nc6xe5 Nf3xe5 Re8xe5 Bh4xf6 Qd8xf6 Qd1xg4+ Kg8f8
11/27 00:02 916.557 523 0.00 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 g4xf3 Qd1xf3 Kg8g7 Qf3g3+ Kg7h8 Qg3f4 Kh8g7 Qf4g3+
12/34 00:23 11.325.397 494 +0.46 Bh4g3 Rf8e8 d4d5 Nc6e7 h2h3 Ne7g6 Ra1b1 Ng6f4 Rb1b2 Nf6h5 Bg3h2 Nh5f6 Kg1h1
13/34 00:27 13.755.587 503 +0.41 Bh4g3 e5xd4 c3xd4 g5g4 Nf3h4 Nc6xd4 e4e5 d6xe5 Bg3xe5 c7c5 Nh4f5 Nd4xf5 Bd3xf5 Qd8xd1 Ra1xd1
14/36 00:37 19.020.800 518 +0.23 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 Nf3d2 Nc6xd4 f2f3 g4xf3 Nd2xf3 Nd4c6 Qd1d2 Kg8g7 Nf3e5 Re8e6 Ne5g4
15/44 01:13 38.350.149 521 +0.37 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 Nf3d2 Nc6xd4 f2f3 g4g3 h2xg3 Re8e5 g3g4 Bb7c6 Ra1b1 Qd8e7 Rb1b2
16/61 05:31 164.920.629 497 +0.43 Bh4g3 e5xd4 c3xd4 g5g4 Bg3h4 Rf8e8 Nf3d2 Nc6xd4 f2f3 g4g3 h2xg3 Nd4e6 g3g4 Ne6f4 Qd1c2 Re8e5 Rf1b1 Nf4xd3 Qc2xd3
17/61 13:44 412.910.293 500 +0.41 Bh4g3 Rf8e8 d4d5 Nc6a5 Nf3d2 Bb7c8 h2h3 Nf6d7 Bd3c2 Nd7c5 Qd1e2 Bc8d7 Rf1b1 Qd8f6 Nd2f3 Kg8g7 Rb1b2
17/66 18:34 562.299.855 504 +1.06 Nf3xg5 h6xg5 Bh4xg5 e5xd4 f2f4 d4xc3 Qd1e1 Kg8g7 Qe1xc3 Rf8e8 h2h4 Nc6d4 Qc3xd4 Bb7c6 f4f5 Re8e5 Bg5f4 Re5e8 Rf1e1
18/66 24:10 733.099.177 505 +1.16 Nf3xg5 h6xg5 Bh4xg5 e5xd4 f2f4 d4xc3 Qd1e1 Kg8g7 Qe1xc3 Rf8e8 h2h4 Nc6d4 Qc3xd4 Bb7c6 f4f5 Ra8b8 Ra1b1 Re8h8 e4e5 d6xe5 Qd4xe5
19/73 1:02:59 1.922.445.191 508 +1.36 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Bb7c6 Bh4g3 e5xd4 c3xd4 Bc6xe4 Bc2a4 Re8e7 d4d5 Kg8h7 Nf3d4 Ng6e5 f2f3 Be4g6 Qd1c1
20/73 1:27:30 2.657.518,028 506 +1.36 Nf3xg5 Nc6e7 Ng5f3 Ne7g6 Rf1e1 Rf8e8 Bd3c2 Bb7c6 Bh4g3 e5xd4 c3xd4 Bc6xe4 Bc2a4 Re8e7 d4d5 Kg8h7 Nf3d4 Ng6e5 f2f3 Be4g6 Qd1c1

Tony

[kgburcham]

[D] r2q1rk1/pbp2p2/1pnp1n1p/4p1p1/2PPP2B/P1PB1N2/5PPP/R2Q1RK1 w - -

Rybka 2.3.2a mp x64
Hash 2048

17.01 0:59 +0.27 1.Bg3 Re8 2.d5 Na5 3.Nd2 Nd7 4.Bc2 Nc5 5.Rb1 c6 6.Qf3 Kg7 7.h3 Rc8 (20.675.311) 357
18.01 1:26 +0.28 1.Bg3 Re8 2.d5 Na5 3.Nd2 Nd7 4.Bc2 Nc5 5.Rb1 c6 6.Qf3 Kg7 7.h3 Rc8 (29.795.310) 351
19.01 1:54 +0.26 1.Bg3 Re8 2.d5 Na5 3.Nd2 Nd7 4.Bc2 Nc5 5.Rb1 c6 6.Qe2 Rc8 7.f3 Qd7 (39.169.206) 350
19.04 18:03 +0.94 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Qe7 6.Bg3 c5 7.d5 Ba6 (412.814.390) 390
20.01 18:03 +0.93 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Qe7 6.Bg3 c5 7.d5 Ba6 (412.814.404) 390
21.01 18:16 +0.94 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Qe7 6.Bg3 c5 7.d5 Ba6 (416.278.280) 388
22.01 21:29 +0.90 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Rb8 6.Qd2 Rg8 7.Rb2 Kh7 (485.295.260) 385
23.01 40:16 +0.89 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Rb8 6.a4 a5 7.Re3 Ba6 (897.717.817) 380
24.01 51:56 +0.90 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Rb8 6.a4 Ba6 7.Bd3 Bb7 (1.147.174.670) 376
25.01 69:23 +0.90 1.Nxg5 Ne7 2.Nf3 Ng6 3.Re1 Re8 4.Bc2 Kg7 5.Rb1 Rb8 6.h3 Qe7 7.Qd2 Rg8 (1.527.968.522) 375

[Eelco de Groot]

Unfortunately as someone discovered earlier this week Shredder 11 has a bug in reporting Fail Highs to the GUI, so often, maybe always, it only shows a Fail High if you stop analysis or in the case of an EPD test it will give the correct answer, but only when the maximum time for a position has elapsed. The same happens here but I assumed that the default settings can find Nxg5 at twenty ply, but I just don't know exactly when. If you take the time to get to twenty ply as a lower limit then for Shredder Default it is more han 13 minutes but when I stopped the search after about 14', there was not yet a Fail High.

[D]r2q1rk1/pbp2p2/1pnp1n1p/4p1p1/2PPP2B/P1PB1N2/5PPP/R2Q1RK1 w - -

Engine: Shredder 11 Default (256 MB)
by Stefan Meyer-Kahlen

9/24 0:00 +0.16 1.Bg3 Qe7 2.d5 Na5 3.Qc2 Ba6 4.Nd2 Qd7
5.f3 c6 6.Bf2 (211.231) 451

10/24 0:00 +0.12 1.Bg3 Qe7 2.d5 Na5 3.Nd2 Ba6 4.Qe2 Nb7
5.Nb3 Nd7 6.Qh5 Nbc5 7.Nxc5 Nxc5 (390.594) 454

11/29 0:03 +0.22 1.Bg3 Qe7 2.Qe2 Ba6 3.Rab1 Rfe8 4.d5 Na5
5.Nd2 c5 (1.613.298) 447

12/30 0:05 +0.18 1.Bg3 exd4 2.cxd4 g4 3.d5 gxf3
4.dxc6 fxg2 5.cxb7 gxf1R+ 6.Qxf1 Rb8
7.e5 dxe5 8.Bxe5 Qe7 9.Qg2+ Kh8
10.Re1 Rg8 (2.344.838) 457

13/32 0:10 +0.21 1.Bg3 Qe7 2.Qe2 Kg7 3.h3 Ba6 4.Rab1 Nh5
5.d5 Na5 6.Nd2 Nf4 7.Bxf4 exf4 8.Qh5 c5 (4.936.329) 462

14/35 0:52 +0.27 1.Bg3 Nd7 2.h4 Qf6 3.Bc2 Na5 4.Ba4 c6
5.hxg5 hxg5 6.Qd2 Nxc4 7.Qxg5+ Qxg5
8.Nxg5 Kg7 9.Rfe1 Rh8 10.Kf1 Rh5
11.Bb3 (23.989.873) 457

15/38 1:25 +0.13 1.Bg3 Re8 2.d5 Na5 3.h4 Nd7 4.Nh2 Nc5
5.Ng4 Kg7 6.Ne3 Bc8 7.hxg5 hxg5 (38.833.001) 454

16/35 1:34 +0.13 1.Bg3 Re8 2.d5 Na5 3.Nd2 Nd7 4.Qh5 Nc5
5.Be2 Nab3 6.Nxb3 Nxb3 7.Ra2 Nc5
8.f3 Qf6 9.Bf2 Kg7 10.Bxc5 dxc5
11.Bd3 Bc8 (43.488.225) 458

17/40 3:34 +0.20 1.Bg3 Re8 2.Re1 Nd7 3.h3 Na5 4.Qc2 Qe7
5.Rab1 c5 6.d5 Ba6 7.Nd2 Kg7 8.Bh2 Nf6
9.Rf1 Qd7 10.Be2 Rf8 (98.822.046) 460

18/42 5:37 +0.19 1.Bg3 Re8 2.Re1 Nd7 3.Rb1 Qf6 4.Bc2 Na5
5.Ba4 c6 6.Qd3 Ba6 7.Nd2 Kg7 8.h3 Qg6
9.Re3 Nf6 10.Bh2 Nh5 11.Ree1 Qf6 (155.523.831) 460

19/51 9:22 +0.16 1.Bg3 Re8 2.Re1 Nd7 3.Rb1 Na5 4.Qc2 Qf6
5.h3 c5 6.d5 Ba6 7.Qa4 Nf8 8.Nd2 Ng6
9.Re3 Red8 10.Be2 Nf4 11.Bg4 Kg7
12.Bh2 (259.126.181) 460

20/44 13:11 +0.15 1.Bg3 Re8 2.Re1 Nd7 3.Rb1 Na5 4.Qc2 Qf6
5.h3 c5 6.d5 Ba6 7.Qa4 Nf8 8.Nd2 Ng6
9.Re3 Re7 10.Be2 Rf8 11.Bg4 Nf4 (368.485.878) 465

best move: Bh4-g3 time: 14:39.563 min n/s: 472.824 CPU 95.1% n/s(1CPU): 497.186 nodes: 415.863.802


For Shredder 11+ I got a slightly better result this is partly because it chooses 1...Nd7 quickly after 1. Bg3, it is a good move but maybe not the only choice, it does help lower the solution time, at least the time to twenty ply deep because after 1. Bg3 Nd7 the settings see a move repetition and a quick 0.00 score is the result. Because of the bug I do not know exactly when the Fail High for Nxg5 occurred, the time of 31:29 is just the time that I stopped the search:


r2q1rk1/pbp2p2/1pnp1n1p/4p1p1/2PPP2B/P1PB1N2/5PPP/R2Q1RK1 w - -

Engine: Shredder 11+ Beta4 (256 MB, Athlon 2009 MHz)
by Stefan Meyer-Kahlen

9/21 0:00 -0.14 1.Bg3 exd4 2.cxd4 g4 3.Nh4 Nxd4 4.e5 dxe5
5.Bxe5 h5 6.Nf5 Nxf5 7.Bxf5 Qxd1
8.Rfxd1 (120.452) 428

10/26 0:01 -0.05 1.Bg3 Nd7 2.h3 Qf6 3.Be2 Kg7 4.Rb1 Na5
5.Qc2 c5 6.d5 Ba6 7.Nd2 (686.937) 430

11/30 0:03 +0.03 1.Bg3 Nd7 2.h4 Qf6 3.Be2 Qg6 4.Qd3 Ne7
5.Nd2 c5 6.d5 Nf6 7.Rab1 g4 (1.407.872) 431

12/31 0:06 +0.13 1.Bg3 Nd7 2.h4 Qf6 3.Bc2 Qg7 4.Ba4 Nf6
5.d5 Ne7 6.Qd3 g4 7.Nd2 Ng6 8.Qe3 (2.846.312) 439

13/31 0:09 -0.05 1.Bg3 exd4 2.cxd4 g4 3.Nh4 Nxd4 4.e5 dxe5
5.Bxe5 c5 6.Re1 Re8 7.Nf5 Nxf5
8.Bxf5 Qxd1 9.Raxd1 Kg7 (4.441.796) 449

14/36 0:44 +0.12 1.Bg3 Nd7 2.h4 Qf6 3.Bc2 Qg7 4.Ba4 Nf6
5.d5 Ne7 6.Qd3 a5 7.Rab1 Ba6 8.Qe2 Rab8
9.Rfd1 Ng4 (20.491.047) 459

15/38 1:28 +0.03 1.Bg3 Nd7 2.Bc2 Qf6 3.h3 Na5 4.Ba4 Qe7
5.Nd2 Bc6 6.Bxc6 Nxc6 7.Qa4 Na5 8.f3 (40.159.585) 452

16/35 1:39 +0.02 1.Bg3 Nd7 2.Bc2 Qf6 3.h3 Na5 4.Ba4 Qe7
5.Nd2 Bc6 6.Bxc6 Nxc6 7.Qa4 Na5 8.f3 (45.104.994) 454

17/44 3:38 +0.04 1.Bg3 Nd7 2.Bc2 Qe7 3.Qe2 Na5 4.Nd2 Nf6
5.Rab1 c5 6.d5 Qd7 7.Qd1 Qe7 8.Ba4 Bc8
9.f3 Nh5 10.Bf2 Bd7 11.Qc2 Bxa4 (100.913.817) 462

18/42 5:03 0.00 1.Bg3 Nd7 2.Bc2 Qe7 3.Qe2 Na5 4.Nd2 Nf6
5.Rab1 c5 6.d5 Qd7 7.Qd1 Qe7 8.Qe2 Qd7
9.Qd1 Qe7 10.Qe2 (140.538.353) 462

19/41 6:17 0.00 1.Bg3 Nd7 2.Bc2 Qe7 3.Qe2 Na5 4.Nd2 Nf6
5.Rab1 c5 6.d5 Qd7 7.Qd1 Qe7 8.Qe2 Qd7
9.Qd1 Qe7 10.Qe2 (175.046.321) 463

20/41 8:54 0.00 1.Bg3 Nd7 2.Bc2 Qe7 3.Qe2 Na5 4.Nd2 Nf6
5.Rab1 c5 6.d5 Qd7 7.Qd1 Qe7 8.Qe2 Qd7
9.Qd1 Qe7 10.Qe2 (249.704.411) 466

20/57 31:29 0.00++ 1.Nxg5 (943.155.234) 499 SB:8

best move: Nf3xg5 time: 31:29.219 min n/s: 499.238 CPU 96.9% n/s(1CPU): 515.209 nodes: 943.155.234 SB: 8

[Marc MP]

Hi Tony,

You must be the most patient person around here 31 hours search for Rybka?

On my PIV 2.4 Chess Tiger Gambit 2007 couldn't solve it within an hour. However I used the uci function "searchmove" and got the following results:

Code: Select all

00:00:37.2  1.   Score: -0,33   depth: 23 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Rf3 Nd4 Bxf6+ Qxf6 Rg3+ Kh8 Rh3+ Kg8 Rg3+ Kh8 Rh3+ Kg8 Rg3+ Kh8 Rh3+ Kg8 Rg3+ Kh8 

00:02:36.0  1.   Score: 0,57   depth: 23 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Rf3 Nd4 Rh3 Rh8 e5 dxe5 fxe5 Nf3+ Rxf3 Bxf3 exf6+ 

00:08:02.5  1.   Score: 1,16   depth: 25 Nxg5 Ne7 f4 hxg5 Bxg5 Nh7 Bh6 exd4 cxd4 f5 Bxf8 Qxf8 exf5 Nf6 

00:22:55.5  1.   Score: 1,50   depth: 26 Nxg5 Ne7 f4 hxg5 Bxg5 Nh7 Bh6 exd4 Qg4+ Ng6 f5 Nf6 Qh3 Bc8 Bxf8 Nxf8 cxd4 Qe7 Qg3+ 

Analysis completed Chess Tiger Gambit 2007

Now the same with Glaurung 2.01:

Code: Select all

00:00:57.4  1.   Score: 0,29   depth: 18 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Qxc3 Re8 Rac1 Qe7 Rce1 Rad8 e5 dxe5 fxe5 Qc5+ Be3 Nd5 

00:02:00.8  1.   Score: 0,88   depth: 19 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Qxc3 Re8 Rf3 Re6 Rg3 Kh8 Rh3+ Kg8 Rh6 Ne5 fxe5 dxe5 

00:05:23.4  1.   Score: 1,15   depth: 20 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Qxc3 Re8 h4 Nb8 e5 Nbd7 exf6+ Kg8 Rfe1 Nc5 Rxe8+ Qxe8 Re1 Ne4 Qd4 

00:11:44.7  1.   Score: 1,35   depth: 21 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Qxc3 Re8 h4 Nb8 e5 Nbd7 exf6+ Kh8 Rae1 Nc5 Rxe8+ Qxe8 Re1 Be4 Qd4 Nxd3 Rxe4 

00:19:29.8  1.   Score: 1,31   depth: 22 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 Kg7 Qxc3 Re8 h4 Nb8 e5 Nbd7 exf6+ Kh8 Rae1 Nc5 Rxe8+ Qxe8 Re1 Qd7 Be2 Kg8 h5

Analysis completed Glaurung 2.01 

Ng5 does indeed looks like a good move! Deep tactics I must say. Maybe the quads will find it in a reasonable time?

I tried my old Fritz 8 on it (original test position, not explicitly searching fot Nxg5!):

Code: Select all

1.Bg3 exd4 2.cxd4 g4 3.Bh4 Re8 4.Re1 gxf3 5.Qxf3 Nxd4 6.Qxf6 Qxf6 7.Bxf6 Nb3 8.Rad1 Nc5 
  ±  (0.82)   Depth: 16/46   00:23:17  1129mN
1.Nxg5! 
  ±  (0.83)   Depth: 16/46   00:27:37  1350mN
1.Nxg5! 
  ±  (0.98)   Depth: 16/46   00:31:45  1554mN
1.Nxg5! 
  ±  (1.30)   Depth: 16/46   00:40:53  2007mN
1.Nxg5 hxg5 2.Bxg5 exd4 3.f4 dxc3 4.Qe1 Kg7 5.Rf3 Nd4 6.Rg3 Qd7 7.Qxc3 c5 
  +-  (1.53)   Depth: 17/44   01:15:13  3709mN

I suspect Fritz 9 or Fritz 10 will find it even faster but I'm so sure about the newer and stronger Fritz 11 as its tactical abilities seems to have diminish somewhat from what I've seen. Maybe you can take a look at this thread to find good test position solvers: http://www.talkchess.com/forum/viewtopi ... e4d543464e

[Eelco de Groot]

About Shredder 11+ Beta4: I just made these settings to test some positions today so it is very possible they play terribly, a first testmatch with Beta 2 settings against Naum 3 was lost, first game Shredder threw away a draw by a bad horizon effect in the endgame, -playing too quickly perhaps?-, but that does not say everything, the default settings also play the erroneous 59. Ng5? or 59.Nd6+? before finding that 59. f5 is better and holds the draw:


Position from testmatch against Naum 3:

[D]8/5p2/4b1p1/pk2K2p/4NP1P/P5P1/8/8 w - -

Engine: Shredder 11 Default (64 MB)
by Stefan Meyer-Kahlen

9/17 0:00 0.00 59.Nd6+ Ka4 60.Nb7 Bc8 61.Nd6 Be6
62.Nb7 Bc8 63.Nd6 Be6 (24.248) 515 SB:21

10/18 0:00 0.00 59.Nd6+ Ka4 60.Nb7 Bc8 61.Nd6 Be6
62.Nb7 Bc8 63.Nd6 Be6 (48.731) 624 SB:36

10/18 0:00 +0.55 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q (73.809) 677 SB:92

11/24 0:00 +0.95 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 Kc4 64.Kxh5 a4
65.f5 Kd5 66.f6 Ke6 67.Kg6 a3 (124.092) 721 SB:971

12/22 0:00 +0.30 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf3+ Kc4 (167.832) 671
SB:1.169

13/23 0:00 +0.43 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf4 Qd5 (241.074) 700
SB:1.463

14/26 0:00 +0.45 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf4 Qd5
69.g4 (331.143) 757 SB:1.951

15/33 0:00 +0.64 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf7+ Ka3
69.Qf4 Qe2 70.Qd4 (492.234) 769
SB:3.593

16/34 0:00 +0.67 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf3+ Ka2
69.Qf4 Qh8 70.Qc4+ Kb2 (706.732) 780
SB:6.004

17/40 0:01 +0.60 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qd1 68.Qf7+ Kc3
69.Qc7+ Kb3 70.Qb6+ Kc4 71.Qc6+ Kb4
72.Qe4+ (1.068.723) 786 SB:11.453

18/42 0:02 +0.59 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 a4 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qd1 68.Qf7+ Kc3
69.Qc7+ Kb3 70.Qb6+ Kc4 71.Qc6+ Kb4
72.Qe4+ (1.710.300) 787 SB:21.023

19/43 0:13 -1.56 59.Ng5 Bb3 60.f5 Ka4 61.fxg6 fxg6
62.Kd4 Kxa3 63.Kc3 Bd5 64.Kd4 Bh1
65.Kc3 a4 66.Nh3 Bd5 (10.474.512) 800
SB:110.323

19/47 0:54 -0.99 59.Nd6+ Ka4 60.Nb7 Bc8 61.Nd6 Ba6
62.f5 gxf5 63.Nxf5 Bd3 64.Nd6 Kxa3
65.Kd4 Bc2 66.Kc3 Bb3 67.Ne8 a4
68.Nf6 Bd1 69.Kd2 (42.121.151) 771
SB:490.567

19/47 1:00 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 a4
65.g4 Kb4 66.g5 a3 67.g6 a2 68.g7 a1Q (46.975.396) 774
SB:533.641

20/40 1:02 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.g4 hxg4 (48.518.940) 773
SB:552.044

21/38 1:09 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.g4 hxg4 (53.789.002) 779
SB:593.720

22/40 1:15 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.g4 hxg4 (59.540.595) 784
SB:646.294

23/42 1:29 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.g4 hxg4 (70.665.127) 790
SB:752.297

best move: f4-f5 time: 1:33.063 min n/s: 789.969 CPU 98.1% n/s(1CPU): 805.269 nodes: 73.504.253 SB: 797.110

This is the .eng file with the settings for Shredder 11+ Beta4:

[ENGINE]
Name=Shredder 11+ Beta4
Author=Stefan Meyer-Kahlen
Filename=EngineShredder11UCI.exe
[OPTIONS]
Position Learning=false
Prefer Open Positions=true
Queen (Endgame)=99
Forward Pruning=3
King Safety=105
Center Control=102
Pawn Structure=103
Pawn Structure (Endgame)=103
Passed Pawns (Endgame)=104


Shredder 11+ Beta 4 takes about 19 seconds for the correct move 59. f5


8/5p2/4b1p1/pk2K2p/4NP1P/P5P1/8/8 w - -

Engine: Shredder 11+ Beta4 (64 MB)
by Stefan Meyer-Kahlen

9/17 0:00 0.00 59.Nd6+ Ka4 60.Nb7 Bc8 61.Nd6 Be6
62.Nb7 Bc8 63.Nd6 Be6 (23.919) 508 SB:21

10/18 0:00 0.00 59.Nd6+ Ka4 60.Nb7 Bc8 61.Nd6 Be6
62.Nb7 Bc8 63.Nd6 Be6 (51.547) 548 SB:34

10/18 0:00 +0.55 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 Kb3 63.Kxg6 Kc4 64.Kxh5 a4
65.g4 a3 66.f5 Kd5 (84.796) 678 SB:122

11/21 0:00 +0.10 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 (135.926) 726 SB:511

12/22 0:00 +0.31 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf3+ Kc4 (202.417) 720 SB:822

13/22 0:00 +0.44 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf4 Qd5 (269.298) 750
SB:1.118

14/24 0:00 +0.45 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf4 Qd5
69.g4 hxg4 (365.138) 778 SB:1.758

15/33 0:00 +0.63 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf4 Qe2
69.Qf5 Qe3 70.Qf4 (539.679) 785
SB:3.139

16/34 0:00 +0.67 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf3+ Ka2
69.Qf4 Qh8 70.Qc4+ (751.833) 802
SB:5.204

17/36 0:01 +0.73 59.Ng5 Ka4 60.Nxe6 fxe6 61.Kxe6 Kxa3
62.Kf6 a4 63.Kxg6 Kb3 64.f5 a3 65.f6 a2
66.f7 a1Q 67.f8Q Qe5 68.Qf3+ Ka2
69.Qf4 Qe2 70.Qf5 Qe3 71.Qc2+ Ka3 (1.109.751) 816
SB:9.336

18/42 0:04 -0.46 59.Ng5 Ba2 60.Kf6 Ka4 61.Nxf7 Bb1
62.f5 Bxf5 63.Nd6 Bd3 64.Nb7 Be2
65.Kxg6 Bf3 66.Nd6 Kxa3 67.Nc4+ Kb4
68.Ne5 Bd1 69.Nc6+ Kb5 70.Ne5 (3.851.107) 808
SB:45.793

19/27 0:09 -0.48 59.Ng5 Ba2 60.Kf6 Ka4 61.Nxf7 Bb1
62.f5 Bxf5 63.Nd6 Bd3 64.Nb7 Be2
65.Kxg6 Bf3 66.Nd6 Kxa3 67.Nc4+ Kb4
68.Ne5 Bd1 69.Nc6+ Kb5 70.Ne5 a4
71.Kf6 (7.597.248) 834 SB:59.427

19/43 0:19 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 Qxh4 (15.837.897) 818
SB:133.229

20/38 0:20 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 Qxh4 (17.089.357) 819
SB:140.881

21/42 0:23 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 (19.380.377) 821
SB:156.414

22/40 0:28 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 (23.409.984) 817
SB:187.135

23/42 0:36 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 Qxh4 (29.395.058) 814
SB:238.356

24/45 1:12 -0.01 59.f5 Bxf5 60.Nd6+ Ka4 61.Nxf5 f6+
62.Kxf6 gxf5 63.Kxf5 Kxa3 64.Ke4 Kb4
65.g4 a4 66.g5 a3 67.g6 a2 68.g7 a1Q
69.g8Q Qe1+ 70.Kf5 (57.493.796) 795
SB:481.156

best move: f4-f5 time: 1:39.422 min n/s: 788.267 CPU 96.9% n/s(1CPU): 813.485 nodes: 78.358.502 SB: 703.774


Eelco

[tmokonen]

Hi Marc.

I was also using a PIV 2.4 for my testing. This position, unbelievably, comes from a 10' blitz game on Playchess between a 1550ish chump playing white (me) and a 1750ish chump playing black (some other guy).

I played Nxg5 in the game, but for all the wrong reasons. I had mistakenly thought that Bg3 was losing a pawn, and I figured if I'm losing material I might as well do some damage to his kingside pawn structure. When I started analyzing it afterwards, I noticed that a lot of programs liked the position after Nxg5 was played, but had a very hard time finding Nxg5 itself, so I figured it made a pretty good test position.

I have to say, I'm very impressed with the tactical abilities of Bright 0.3a.

Tony

[BBauer]

Hi,
I gave glaurung2.01 a try. On 2 procs of an AMD X2 5200+ computer I got:

Code: Select all

15 +39 319 5001889 Bg3 exd4 cxd4 g4 d5 gxf3 
16 +84 2014 42739139 Bg3 Re8 Re1 Bc8 h3 Nh5 Bh2 
17 +86 3277 68896645 Bg3 Re8 Re1 Bc8 h3 Bd7 Rb1 Re7 
18 +76 4743 102036020 Bg3 Re8 Re1 Bc8 h3 Bd7 Rb1 Re7 
19 +78 7368 160299517 Bg3 Re8 Re1 Bc8 h3 Bd7 Rb1 Re7 
20 +76 13182 285238064 Bg3 Re8 Re1 Bc8 h3 Bd7 Rb1 Re7 
20 +90 22817 499143779 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 
21 +168 40827 903319790 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1 
22 +196 68496 1529697749 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1
23 +211 124580 2817669781 Nxg5 hxg5 Bxg5 exd4 f4 dxc3 Qe1
24 +213 280060 6422166763 Nxg5 Ne7 Nf3 Ng6 Re1 Nxh4 Nxh4

So it took glaurung2.01 228 sec to find Nxg5 and the score is growing.
kind regards
Bernhard