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Up Topic The Rybka Lounge / Test Positions / Test position: Winning Move in the Endgame
- - By Clementin [ca] Date 2011-10-29 17:27
As analyzed by GM Müller ( http://www.chessbase.com/newsdetail.asp?newsid=7639 Tunik-Duzhakov at the end of the page) white wins by playing Nd5! Can your favorite engine find it?

6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - 1 1
Parent - - By ernest (****) [fr] Date 2011-11-02 15:30

> white wins by playing Nd5! Can your favorite engine find it?


Well, it took Houdini 2.0b w32 Nlm (Nalimov 5-men) more than 11 hours (and depth 32) to find Nd5 (Dualcore @3GHz, 1st try)

Analysis by Houdini 2.0b w32 Nlm:
1.Kf4 Kg7
  +/=  (0.28 --)   Depth: 26/57   00:14:57  3009mN, tb=3
1.Kf3 Kf8 2.Kg3 Ke7 3.Ne4 Nd5 4.a3 Ne3 5.Nd6 b6 6.Kh4 Nc2 7.Kxh5 bxc5 8.bxc5 Nxa3 9.Nc8+ Kd7 10.Nxa7 Nc2 11.Kg4 Kc7 12.Kg5 Nd4 13.Kf6 Kb7 14.c6+ Kc7 15.Ke5 Nc2 16.Kd5 Nb4+ 17.Kc5 Nd3+ 18.Kd4 Nb4 19.Ke5 Nxc6+ 20.Nxc6 Kxc6
  +/=  (0.30)   Depth: 26/57   00:20:59  4259mN, tb=4
1.Kf3 Kf8 2.Kg3 Ke7 3.Ne4 Nd5 4.a3 Ne3 5.Nd6 b6 6.Kh4 Nc2 7.Kxh5 bxc5 8.bxc5 Nxa3 9.Nc8+ Kd7 10.Nxa7 Nc2 11.Kg4 Kc7 12.Kg5 Nd4 13.Kf6 Kb7 14.c6+ Kc7 15.Ke5 Nc2 16.Kd5 Nb4+ 17.Kc5 Nd3+ 18.Kd4 Nb4 19.Ke5 Nxc6+ 20.Nxc6 Kxc6
  +/=  (0.30)   Depth: 27/57   00:29:14  5977mN, tb=6
1.b5
  +/=  (0.34 !)   Depth: 27/57   00:34:07  7041mN, tb=7
1.b5
  +/=  (0.44 !)   Depth: 27/57   00:35:32  7351mN, tb=11
1.b5 Kf8 2.a4 h4 3.Kf3 Ke7 4.Kg4 b6 5.cxb6 axb6 6.Ne4 Nd5 7.Kxh4 Ne3 8.Kg5 Nd5 9.Kg4 Ne3+ 10.Kf4 Nc4 11.Kg5 Ne3 12.Nd2 f6+ 13.Kg6 Ng2 14.Nc4 Nf4+ 15.Kh6 Nd5 16.Kg7 Kd8 17.Kh6 Kd7 18.Kg6 Kc7 19.Kg7 Kd8 20.Kh6
  +/=  (0.56)   Depth: 27/63   00:41:08  8597mN, tb=15
1.b5 Kf8 2.a4 h4 3.Kf3 Ke7 4.Kg4 b6 5.cxb6 axb6 6.Ne4 Nd5 7.Kxh4 Ne3 8.Kg5 Nd5 9.Kg4 Ne3+ 10.Kf4 Nc4 11.Kg5 Ne3 12.Nd2 f6+ 13.Kg6 Ng2 14.Nc4 Nf4+ 15.Kh6 Nd5 16.Kg7 Kd8 17.Kh6 Kd7 18.Kg6 Kc7 19.Kg7 Kd8 20.Kh6
  +/=  (0.56)   Depth: 28/63   00:47:37  10046mN, tb=21
1.b5 Kf8 2.a4 h4 3.Kf3 Ke7 4.Kg4 b6 5.cxb6 axb6 6.Ne4 Nd5 7.Kxh4 Ne3 8.Kg5 Nd5 9.Kg4 Ne3+ 10.Kf4 Nc4 11.Kg5 Ne3 12.Nf6 Kd6 13.Ng4 Nd5 14.Kh6 Ke7 15.Kg7 f6 16.Kg6 Nf4+ 17.Kh7 Ne2 18.Ne3 Nf4 19.Nc4 Nd5 20.Kg7 Kd8 21.Kh6 Kd7 22.Kg6 Kc7 23.Kg7 Kd8 24.Kh6
  +/=  (0.56)   Depth: 29/63   01:04:54  13913mN, tb=78
1.b5 Kf8 2.a4 h4 3.Kf3 Ke7 4.Kg4 b6 5.cxb6 axb6 6.Ne4 Nd5 7.Kxh4 Ne3 8.Kg5 Nd5 9.Kg4 Kd7 10.Kf3 Kd8 11.Ke2 Kc7 12.Kd3 Ne7 13.f6 Nf5 14.Ng5 Nh6 15.Kc3 Kd6 16.Kd4 Kd7 17.Kd3 Ng4 18.Nxf7 Nxf6 19.Kd4 Ke7 20.Ne5 Ke6 21.Nc6 Nd5 22.Kd3 Kd6 23.Kc4
  +/=  (0.60)   Depth: 30/63   01:47:16  23538mN, tb=370
1.b5 Kf8 2.a4 h4 3.Kf3 Ke7 4.Kg4 b6 5.cxb6 axb6 6.Ne4 Nd5 7.Kxh4 Ne3 8.Kg5 Nd5 9.Kg4 Kd7 10.Kg3 Ke7 11.Kf2 Kd7 12.Kf3 Kd8 13.Ke2 Kc7 14.Kd3 Ne7 15.Ng3 f6 16.Kd4 Kd7 17.Ke4 Kd6 18.Nh5 Nd5 19.Kd4 Ne7 20.Ng7 Kd7 21.Ke4
  +/=  (0.60)   Depth: 31/65   02:57:06  39473mN, tb=803
1.b5 Kf8
  +/=  (0.54 --)   Depth: 32/65   05:29:44  74194mN, tb=1912
1.Nd5
  +/=  (0.67 !)   Depth: 32/65   11:15:34  152432mN, tb=5228
1.Nd5
  +/-  (0.79 !)   Depth: 32/65   11:32:19  156324mN, tb=5709
1.Nd5 Nxd5 2.Kxd5 Kg7 3.b5 h4 4.Ke4 h3 5.Kf3 h2 6.Kg2 Kf6 7.a4 Kxf5 8.a5 Ke6 9.c6 h1R 10.Kxh1 b6 11.a6 Ke7 12.Kh2 Kd6 13.Kg3 Ke6 14.Kf3 Ke7 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf4 Ke6 18.Ke4 f6 19.Kf4 Kd6 20.Kg3 Ke7 21.Kg2 Ke6 22.Kg1 f5 23.Kg2 Kd6 24.Kg3 Ke6 25.Kf4
  +/-  (0.77)   Depth: 32/65   11:34:16  156793mN, tb=6071
1.Nd5 Nxd5 2.Kxd5 Kg7 3.b5 h4 4.Ke4 h3 5.Kf3 h2 6.Kg2 Kf6 7.a4 Kxf5 8.a5 Ke6 9.c6 b6 10.a6 h1R 11.Kxh1 Ke7 12.Kh2 Kd6 13.Kg3 Ke6 14.Kf3 Ke7 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf4 Ke6 18.Ke4 f6 19.Kf4 Kd6 20.Kg3 Ke7 21.Kg2 Ke6 22.Kg1 f5 23.Kg2 Kd6 24.Kg3 Ke6 25.Kf4
  +/-  (0.77)   Depth: 33/65   12:03:23  163580mN, tb=7331
1.Nd5 Nxd5 2.Kxd5 Kg7 3.b5 h4 4.Ke4 h3 5.Kf3 h2 6.Kg2 Kf6 7.a4 Kxf5 8.a5 Ke6 9.c6 b6 10.a6 h1R 11.Kxh1 Ke7 12.Kh2 Kd6 13.Kg3 Ke6 14.Kf3 Ke7 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf4 Ke6 18.Ke4 f6 19.Kf4 Kd6 20.Kg3 Ke7 21.Kg2 Ke6 22.Kg1 f5 23.Kg2 Kd6 24.Kg3 Ke6 25.Kf4
  +/-  (0.77)   Depth: 34/67   17:31:04  239339mN, tb=12519
Parent - - By kgburcham (***) [us] Date 2011-11-05 02:58
did not try others programs ernest. Maybe another program will solve faster.

6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - 0 1


Houdini 2.0b Pro x64
12 threads

1.Nd5
  +/=  (0.58 ++)   Depth: 33/64   01:16:53  176598mN, tb=14050
1.Nd5
  +/=  (0.70 ++)   Depth: 33/64   01:20:03  184995mN, tb=15815
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 Kg7 4.a4 h3 5.Kf3 h2 6.Kg2 Kf6 7.b5 Kxf5 8.a5 Ke6 9.c6 b6 10.axb6 axb6 11.Kxh2 Kd6 12.Kg3 Ke7 13.Kg2 Kd6 14.Kf3 Ke7 15.Ke4 Ke6 16.Kf4 f6 17.Kg4 Kd6 18.Kf3 Ke7 19.Ke4 Kd6 20.Kf5
  +/-  (0.71)   Depth: 33/66   01:23:16  193605mN, tb=17824
1.Nd5
  +/-  (0.77 ++)   Depth: 34/66   01:31:36  215397mN, tb=24371
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 Kg7 4.a4 h3 5.Kf3 h2 6.Kg2 Kf6 7.b5 Kxf5 8.a5 Ke6 9.c6 b6 10.a6 Kd6 11.Kxh2 Kc7 12.Kg3 Kd6 13.Kg2 Kc7 14.Kf3 Kd6 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf5 f6 18.Ke4 Ke6 19.Ke3 Kd6 20.Kf4 Ke6 21.Ke4 Kd6 22.Kf3 Ke7 23.Kg3 Ke6 24.Kg4 Kd6 25.Kf4 Ke6
  +/-  (0.77)   Depth: 34/66   01:31:59  216305mN, tb=25229
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 Kg7 4.a4 h3 5.Kf3 h2 6.Kg2 Kf6 7.b5 Kxf5 8.a5 Ke6 9.c6 b6 10.a6 Kd6 11.Kxh2 Kc7 12.Kg3 Kd6 13.Kg2 Kc7 14.Kf3 Kd6 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf5 f6 18.Ke4 Ke6 19.Ke3 Kd6 20.Kf4 Ke6 21.Ke4 Kd6 22.Kf3 Ke7 23.Kg3 Ke6 24.Kg4 Kd6 25.Kf4 Ke6
  +/-  (0.77)   Depth: 35/67   02:03:28  289823mN, tb=40197
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 Kg7 4.a4 h3 5.Kf3 h2 6.Kg2 Kf6 7.b5 Kxf5 8.a5 Ke6 9.c6 b6 10.a6 Kd6 11.Kxh2 Kc7 12.Kg3 Kd6 13.Kg2 Kc7 14.Kf3 Kd6 15.Kg4 Ke6 16.Kg5 Ke7 17.Kf5 f6 18.Ke4 Ke6 19.Ke3 Kd6 20.Kf4 Ke6 21.Ke4 Kd6 22.Kf3 Ke7 23.Kg3 Ke6 24.Kg4 Kd6 25.Kf4 Ke6
  +/-  (0.77)   Depth: 36/68   03:20:52  473104mN, tb=83751
Parent - - By ernest (****) [fr] Date 2011-11-05 18:36 Edited 2011-11-05 18:39
Hi KG,

We both found Nd5! with approximately the same billion nodes,
152 for me, 176 for you... :smile:
(your nodes/sec were only 10 times mine - I used my 3GHz dualcore, and 32-bit)

> Maybe another program will solve faster.


You should try Deep Rybka 4.1 ...you will find Nd5! in about 3 minutes! (perhaps even 2!)  :cool:
Parent - - By AndrewWalker (**) [au] Date 2011-11-06 07:19
Shredder 12, 8 threads, with 3-5 men + some 6 men tbs, and 3-5 shredderbases

Engine: Deep Shredder 12 x64 [LO] (2048 MB)
by Stefan Meyer-Kahlen
loading shredderbase C:\tbs\\all345.tbe
shredderbases with 5 pieces found (157 MB)
19/32   0:00   +1.02   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Nxb7 Nxb4 7.a3 Nd5 8.Nd6 f6 9.Kg4 a6 10.a4 Nc3 11.a5 Kd5 12.Nb7 Ne4 (3.640.694) 5558  TB:1.468  SB:3.213
20/33   0:02   +1.14   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 Kd5 7.Na5 Ne6 8.Kg4 f5+ 9.Kg3 Ke4 10.c6 Nc7 11.Kf2 f4 12.Nc4 f3 13.Nd6+ Kd5 14.Nc8 (6.897.374) 3136  TB:6.474  SB:27.190
21/33   0:02   +1.22   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 Kd5 7.Na5 Ne6 8.Kg3 f5 9.c6 Kd4 10.Kf3 a6 11.Kf2 Nc7 12.a3 Ke4 13.Nb7 Kd5 (9.671.979) 3563  TB:9.410  SB:33.777
22/41   0:03   +1.12   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 a6 7.Na5 f5 8.Kg3 Ke4 9.Kf2 f4 10.a3 Nb5 11.a4 Nc7 12.Nc6 Ne6 13.a5 Nc7 14.Ne7 (15.696.884) 4158  TB:12.218  SB:69.952
23/38   0:05   +1.12   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 a6 7.Na5 f5 8.Kg3 Ke4 9.Kf2 f4 10.a3 Nb5 11.a4 Nc7 12.Nc6 Ne6 13.a5 Nc7 14.Ne7 (24.427.325) 4436  TB:16.906  SB:120.347
24/42   0:08   +1.12   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 a6 7.Na5 f5 8.Kg3 Ke4 9.Kf2 f4 10.a3 Kd5 11.a4 Ke4 12.Nc6 Ne6 13.a5 Nc7 14.Ne7 (33.532.101) 4182  TB:24.769  SB:152.639
25/44   0:25   +0.92   1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 a6 7.Na5 Nb5 8.Kg5 Nd4 9.Nc4+ Kd5 10.Ne3+ Ke5 11.Ng4+ Kd5 12.Kf4 Ne6+ 13.Ke3 Kc4 14.a3 (122.554.361) 4758  TB:73.038  SB:617.190
26/49   2:12   +1.04   1.Kf4 Kg7 2.Kg5 h4 3.f6+ Kh7 4.Kxh4 Kg6 5.Ne4 Ne8 6.Kg3 Kf5 7.Kf3 Ke6 8.b5 Nxf6 9.Nd6 b6 10.Nc8 bxc5 11.Nxa7 Kd5 12.a4 c4 13.a5 c3 14.Ke2 (658.233.248) 4957  TB:300.337  SB:3.950.864
27/50   2:41   +0.88   1.Kf4 Kg7 2.Kg5 h4 3.f6+ Kh7 4.Kxh4 Kg6 5.Ne4 Ne8 6.Kg3 Kf5 7.Kf3 Ke6 8.b5 Nxf6 9.Nd6 b6 10.Nc8 bxc5 11.Nxa7 Kd5 12.a4 c4 13.a5 c3 14.Ke2 (781.436.291) 4830  TB:377.386  SB:5.037.849
27/58   5:03   +0.90   1.Kf3 Kf8 2.Kg3 Ke7 3.a4 Kf6 4.Kf4 Ke7 5.Kg5 h4 6.Kxh4 (1.352.599.676) 4453  TB:684.834  SB:15.231.342
27/61  13:13   +2.54   1.Nd5 Na6 2.Kf4 Nb8 3.Kg5 Nd7 4.Kxh5 a5 5.Kg5 Kg7 6.f6+ Kf8 7.a3 axb4 8.axb4 Ke8 9.Nc7+ Kf8 10.Kf5 Nb8 11.Ke4 Nd7 12.Nd5 Ke8 13.Kf5 (4.117.490.290) 5187  TB:1.766.545  SB:58.104.522
28/50  13:35   +2.54   1.Nd5 Na6 2.Kf4 Nb8 3.Kg5 Nd7 4.Kxh5 a5 5.Kg5 Kg7 6.f6+ Kf8 7.a3 axb4 8.axb4 Ke8 9.Nc7+ Kf8 10.Kf5 Nb8 11.Ke4 Nd7 12.Nd5 Ke8 13.Kf5 (4.232.313.567) 5187  TB:1.833.223  SB:59.476.083
29/62  23:10   +2.92   1.Nd5 Na6 2.Kf4 Nb8 3.b5 Kf8 4.Kg5 Ke8 5.Nf6+ Ke7 6.Ne4 h4 7.Kxh4 a6 8.a4 axb5 9.axb5 Nd7 10.Kh5 (7.141.358.732) 5136  TB:3.185.803  SB:102.568.624
30/62  31:26   +3.15   1.Nd5 Ne8 2.b5 b6 3.cxb6 axb6 4.a4 Nd6+ 5.Ke5 Nc4+ 6.Kd4 Nd6 7.Nxb6 h4 8.Ke3 Nxf5+ 9.Kf3 Nd6 10.Nc8 Nc4 11.b6 Kf8 12.Kf4 Na5 13.Nd6 Ke7 14.Nc4 (9.376.023.482) 4970  TB:4.472.188  SB:141.304.153
31/64  47:27   +3.20   1.Nd5 Ne8 2.b5 Kf8 3.f6 b6 4.c6 Nd6+ 5.Ke5 Nc4+ 6.Kf4 Ke8 7.Kg5 h4 8.Kg4 Kd8 9.Kxh4 Kc8 10.Kg5 Na3 11.Nc3 Nc4 12.a4 Nd6 13.Nd5 (13.889.553.447) 4878  TB:6.484.914  SB:252.731.150
32/63  58:41   +2.86   1.Nd5 Ne8 2.b5 Kg7 3.Kf4 Kh6 4.c6 bxc6 5.bxc6 Nd6 6.c7 Nc8 7.f6 a6 8.Ne7 Na7 9.a3 h4 10.Kg4 h3 11.Kxh3 Kg5 12.Nd5 Nc8 13.a4 (17.213.287.230) 4887  TB:7.887.822  SB:326.769.009
33/69  71:52   +2.86   1.Nd5 Ne8 2.b5 Kg7 3.Kf4 Kh6 4.c6 bxc6 5.bxc6 Nd6 6.c7 Nc8 7.f6 a6 8.Ne7 Na7 9.a3 h4 10.Kg4 h3 11.Kxh3 Kg5 12.Nd5 Nc8 13.a4 (21.115.708.147) 4895  TB:9.485.191  SB:441.328.726
34/71  149:19   +3.44   1.Nd5 Ne8 2.b5 Kg7 3.Kf4 Kh6 4.c6 bxc6 5.bxc6 Nd6 6.c7 Nc8 7.f6 a6 8.Ne7 Na7 9.c8Q Nxc8 10.Nxc8 Kg6 11.Ne7+ Kxf6 12.Nd5+ Kg6 13.a4 f6 14.Nb4 (42.639.565.537) 4758  TB:21.374.647  SB:955.382.144
35/71  223:57   +3.01   1.Nd5 Ne8 2.b5 Kg7 3.Kf4 Kh6 4.c6 bxc6 5.bxc6 Nd6 6.c7 Nc8 7.f6 a6 8.Ne7 Na7 9.c8Q Nxc8 10.Nxc8 Kg6 11.Ne7+ Kxf6 12.Nd5+ Kg6 13.a4 f6 14.Nb4 (62.312.485.463) 4637  TB:29.059.869  SB:1.686.159.757
36/77  342:49   +3.17   1.Nd5 Ne8 2.b5 Kg7 3.Kf4 Kh6 4.c6 bxc6 5.bxc6 Nd6 6.c7 Nc8 7.f6 a6 8.Ne7 Na7 9.c8Q Nxc8 10.Nxc8 Kg6 11.Ne7+ Kxf6 12.Nd5+ Kg6 13.a4 f6 14.Nb4 (94.109.523.903) 4575  TB:40.788.581  SB:2.770.095.055

If you force Nd5 Nxd5 Shredder finds a much bigger eval quickly, so Ne8 offers more resistance.
Parent - By AndrewWalker (**) [au] Date 2011-11-06 07:28
Using Shredder 12 under the Fritz interface and no shredderbases (but the rest the same)
it was a lot slower to find Nd5 and then spent a long while on one ply where it finally
found the higher score.

1.b5 h4 2.Kf3 b6 3.cxb6 axb6 4.a4 Kg7 5.Ne4 Nd5 6.Kg4 Kf8 7.Kxh4 Ke7 8.Kg5 f6+ 9.Kg4 Kd7 10.Kf3 Kc7 11.Ke2 Ne7 12.Nxf6 Nxf5 13.Nd5+ Kb7 14.Kd3 Nd6
  +/-  (0.98)   Depth: 30/62   00:16:48  5607mN, tb=372635
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 h3 4.Kf3 h2 5.Kg2 Kg7 6.a4 h1Q+ 7.Kxh1 Kf6 8.a5 Kxf5 9.b5 Ke6 10.c6 b6 11.a6 Ke7 12.Kg2 Ke8 13.Kg3 Kd8 14.Kf4 Ke8
  +/-  (1.34)   Depth: 30/67   00:28:17  10045mN, tb=528526
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 h3 4.Kf3 h2 5.Kg2 Kg7 6.a4 h1Q+ 7.Kxh1 Kf6 8.a5 Kxf5 9.b5 Ke6 10.c6 b6 11.a6 Ke7 12.Kg2 Ke8 13.Kg3 Kd8 14.Kf4 Ke8
  +/-  (1.34)   Depth: 31/63   00:34:06  11934mN, tb=755589
1.Nd5 Ne8 2.b5 b6 3.cxb6 axb6 4.a4 Nd6+ 5.Ke5 Nc8 6.Nf6+ Kf8 7.Nxh5 Ke7 8.Kd5 Kd7 9.Nf6+ Kc7 10.Ke5 Kd8
  +-  (3.23)   Depth: 32/74   04:55:21  112913mN, tb=9931801

I saw the Houdini analysis had a very small use of tablebases, maybe altering the parameter for this
so it probes more often would speed it up?
Parent - - By Master Om (*****) [in] Date 2011-11-08 10:06
New game
6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - 0 1


Analysis by Deep Rybka 4.1 w32:

1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.b5
  +/-  (0.98 ++)   Depth: 6   00:00:00  1kN
1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.b5 a6 5.b6
  +/-  (1.02)   Depth: 6   00:00:00  1kN
1.Kf4 f6 2.Kg3 Kh7 3.b5 Kg7 4.c6 bxc6 5.bxc6
  +/-  (0.97)   Depth: 7   00:00:00  1kN
1.Kf4 Kg7 2.Kg5 h4 3.f6+ Kh7 4.Kxh4 Kg6 5.Ne4 Nd5 6.a3 Ne3
  +/-  (1.08)   Depth: 8   00:00:00  2kN
1.Kf4 Kg7 2.Kg5 h4 3.f6+ Kh7 4.Kxh4 Kg6 5.Ne4 Ne8 6.Nd6 Nxd6 7.cxd6 Kxf6
  +/-  (1.20 ++)   Depth: 9   00:00:00  6kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.a3 b6 7.Nxf7+ Kxf5 8.Kg3 Ke6 9.Ng5+ Kd7 10.Nf3 Kc7 11.Kg4
  +/-  (1.06)   Depth: 9   00:00:00  7kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.a3 b6 7.Nxf7+ Kxf5 8.Kg3 Ke6 9.Ng5+ Kd7 10.Nf3 Kc7 11.Kg4
  +/-  (1.06)   Depth: 10   00:00:00  8kN
1.Kf4 Kg7 2.a3 f6 3.b5 Kf7 4.Kg3 Ne8 5.Ne4 Ke7 6.Kh4 Ng7 7.Nd6
  +/-  (1.07)   Depth: 11   00:00:00  14kN
1.Kf4 Kg7 2.a3 f6 3.b5 Kf7 4.Kg3 Ne8 5.Nd5 Ng7 6.Kf4
  +/-  (1.19 ++)   Depth: 12   00:00:00  25kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kf3 Nxf5 9.Nxb7 Nd4+ 10.Kg4 f5+ 11.Kg5 f4
  +/-  (1.08)   Depth: 12   00:00:00  38kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kf3 Nxf5 9.Nxb7 Nd4+ 10.Kg3
  +/-  (1.20 ++)   Depth: 13   00:00:00  53kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.Nd8 f5 11.Kg5 f4 12.Nf7+ Ke4 13.Nd6+ Ke5
  +/-  (1.17)   Depth: 13   00:00:00  55kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.Nd8 f5 11.Kg5 f4 12.Nf7+ Ke4 13.Nd6+ Ke5
  +/-  (1.17)   Depth: 14   00:00:00  64kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.Nd8 f5 11.Nf7+ Kf6 12.Nd6 Ke5 13.Nc4+ Kd5 14.Ne3+ Ke4
  +/-  (1.17)   Depth: 15   00:00:01  97kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.Nd8 f5 11.Nf7+ Kf6 12.Nd6 Ke5 13.Nc4+ Kd5 14.Ne3+ Ke4
  +/-  (1.17)   Depth: 16   00:00:01  175kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.a4 a6 11.Na5 f5 12.Kh4 Ne6 13.Kg3 Ke4 14.c6 Nc7 15.Nc4 Kd5 16.Ne3+
  +/-  (1.29 ++)   Depth: 17   00:00:04  517kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.a4 a6 11.Na5 f5 12.Kh4 Ne6 13.Kg3 Ke4 14.c6 Nc7 15.Nc4 Kd5 16.Ne3+
  +/-  (1.28)   Depth: 17   00:00:05  532kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 Nxf5 9.Nxb7 Nd4 10.a4 a6 11.Na5 f5 12.Kh4 Ne6 13.Kg3 Ke4 14.c6 Nc7 15.Nc4 Kd5 16.Ne3+
  +/-  (1.28)   Depth: 18   00:00:05  630kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Kxf5 5.Nd6+ Ke5 6.Nxb7 f5 7.a4 Nd5 8.c6 Ke6 9.b5 Nc3 10.Nc5+ Kd6 11.Kh3 Nd5 12.Nb7+ Kc7 13.Kg3 Nc3 14.Nc5 Kd6 15.Nb3 Nxa4 16.Nd4
  +/-  (1.28)   Depth: 19   00:00:13  1559kN
1.Kf3 Kg7 2.a3 a6 3.Kf4 h4 4.Kg4 Ne8 5.b5 axb5 6.Nxb5 Nf6+ 7.Kxh4 Nd7 8.Kg5 Nxc5 9.f6+ Kf8 10.Nd6
  +/-  (1.14)   Depth: 20   00:01:00  7241kN
1.Kf3 Kg7 2.a3 a6 3.Kf4 h4 4.Ne4 Nd5+ 5.Kf3 h3 6.Kg3 Ne3 7.Nd6 Kf6 8.Nxb7 Nxf5+ 9.Kxh3 Nd4 10.Na5 Ke5 11.a4 f5 12.Kg3 Ne6 13.Nc6+ Ke4 14.Kf2 Nf4
  +/-  (0.99)   Depth: 21   00:01:09  8327kN
1.Kf3 Kg7 2.a3 a6 3.Kf4 h4 4.Ne4 Nd5+ 5.Kf3[] h3 6.Kg3 Ne3 7.Kxh3 Nxf5 8.a4 Nd4 9.Kg2 f5 10.Nd6 Kf6 11.Nxb7 Ke5 12.Kg3 f4+ 13.Kf2 Kd5 14.Na5 Ke6 15.Kg2 Nc2 16.b5
  +/-  (0.98)   Depth: 22   00:01:17  9213kN
1.b5 Kf8 2.a4 Ke7 3.Nd5+ Nxd5 4.Kxd5 h4 5.Ke4 h3 6.Kf3 h2 7.Kg2
  +/-  (1.10 ++)   Depth: 23   00:04:36  33735kN
1.b5 b6 2.c6 h4 3.Kf3 Kg7 4.Ne4 Nxb5 5.Kg4 f6 6.Kxh4 Kf7 7.Kg4 a6 8.Kh5 Nc7 9.Nd6+ Kg7 10.Kg4 Kf8 11.Nc8 Na8 12.Kh5 Kf7 13.a4 Kg7 14.Kg4 Kf7
  +/-  (1.25 ++)   Depth: 23   00:07:44  57767kN
1.b5 b6 2.cxb6 axb6 3.a4 h4 4.Kf3 Kg7 5.Ne4 Nd5 6.Kg4 Ne3+ 7.Kxh4 Kf8 8.f6 Nc4 9.Kg4 Ke8 10.Kf5 Kd7 11.Ng5 Ne3+ 12.Kf4 Nc4 13.Ke4 Nd6+ 14.Kd4 Kc7 15.Ke5 Nc4+ 16.Ke4
  +/-  (1.37)   Depth: 23   00:09:04  67157kN
1.b5 b6 2.cxb6 axb6 3.a4 h4 4.Kf3 Kg7 5.Ne4 Nd5 6.Kg4 Ne3+ 7.Kxh4 Kf8 8.f6 Nc4 9.Kg4 Ke8 10.Kf5 Kd7 11.Ng5 Ne3+ 12.Kf4 Nc4 13.Ke4 Nd6+ 14.Kd4 Kc7 15.Ke5 Nc4+ 16.Ke4
  +/-  (1.37)   Depth: 24   00:09:31  69860kN

(Prakash, BBSR 08.11.2011)

No light after 10 mins......:confused:
Parent - - By ernest (****) [fr] Date 2011-11-08 17:11

> No light after 10 mins......


1st try on dualcore@3GHz (what is your processor?)

6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - 0 1
Analysis by Deep Rybka 4.1 w32:
.............
1.b5 Kf8 2.a4 Ke7 3.Kf4 b6 4.cxb6 axb6 5.Kg5 Kd6 6.Kxh5 Ke5 7.Kg5 Ne8 8.Nb1 Kd6 9.Kf4 f6 10.Nd2 Kc5 11.Nf3 Kb4 12.Nd4 Kxa4
  +/-  (1.36)   Depth: 26   00:15:05  115mN, tb=28569
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4[] h3 4.Kf3 Kg7 5.a4
  +-  (1.48 !)   Depth: 27   00:25:31  196mN, tb=52139

...far better than any other program I tested on that endgame!
Parent - By Master Om (*****) [in] Date 2011-11-09 01:29
dual core @ 2.6 Hz
Parent - By Master Om (*****) [in] Date 2011-11-09 01:42
New game
6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - 0 1


Analysis by Deep Rybka 4.1 SSE42 x64:

1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.b5 b6
  +/-  (0.99)   Depth: 6   00:00:00  1kN
1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.a4 a6 5.b5 axb5 6.axb5 Ne8
  +/-  (1.09)   Depth: 7   00:00:00  1kN
1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.a4 a6 5.b5 axb5 6.axb5 Ne8
  +/-  (1.09)   Depth: 8   00:00:00  3kN
1.Kf4 f6 2.Kg3 Kg7 3.Kh4 Kh6 4.a4 a6 5.b5 axb5 6.axb5 Ne8 7.c6
  +/-  (1.21 !)   Depth: 9   00:00:00  7kN
1.Kf4 h4 2.Kg4 Kg7 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.b5 b6 7.Kg4 bxc5 8.Nxf7+ Kd4 9.Kg5 Nc3
  +/-  (1.09)   Depth: 9   00:00:00  8kN
1.Kf4 h4 2.Kg4 Kg7 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.b5 b6 7.Kg4 bxc5 8.Nxf7+ Kd4 9.Kg5 Nc3
  +/-  (1.09)   Depth: 10   00:00:00  8kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 b6 9.Kg6 Ng4 10.Nf7+
  +/-  (1.20)   Depth: 11   00:00:00  13kN
1.Kf4 Kg7 2.Kg5 h4 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 b6 9.Kg6 Ng4 10.Nf7+
  +/-  (1.20)   Depth: 12   00:00:00  13kN
1.Kf4 h4 2.Kg4 Kg7 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.Kg4 f6 7.a3 Ne3+ 8.Kh5 b6 9.Kg6 Ng4 10.cxb6 Kxd6 11.bxa7
  +/-  (1.16)   Depth: 13   00:00:00  19kN
1.Kf4 h4 2.Kg4 Kg7 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.b5 b6 7.Nxf7+ Kxf5 8.c6 Ke6 9.Ng5+ Kd6 10.Ne4+ Ke5 11.Nc3 Nxc3 12.c7
  +/-  (1.16)   Depth: 14   00:00:00  58kN
1.Kf4 h4 2.Kg4 Kg7 3.Kxh4 Kf6 4.Ne4+ Ke5 5.Nd6 Nd5 6.b5 b6 7.Nxf7+ Kxf5 8.c6 Ke6 9.Ng5+ Kd6 10.Ne4+ Ke5 11.Nc3 Nxc3 12.c7
  +/-  (1.16)   Depth: 15   00:00:00  177kN
1.Kf4 Kg7 2.a4 h4 3.Kg4 Kf6 4.Ne4+ Ke5 5.Nd6 h3 6.Kxh3 Na6 7.Kh4 Nxb4 8.Kg5 f6+ 9.Kg6 Nd5 10.Nxb7 Ne7+ 11.Kf7 Nxf5 12.c6
  +/-  (0.87)   Depth: 16   00:00:01  815kN
1.b5 Kf8 2.Kf4 Ke7 3.a4 f6 4.a5 Kd7 5.Kg3 Ne8 6.Nd5 Kd8 7.b6 axb6 8.cxb6 Kd7 9.a6
  +/-  (1.07)   Depth: 16   00:00:01  867kN
1.b5 Kf8 2.Kf4 Ke7 3.a4 f6 4.a5 Kd7 5.Kg3 Ne8 6.Nd5 a6 7.bxa6 bxa6 8.Nb4 Kc7 9.Kf4 Kd7 10.Nxa6 Kc6
  +/-  (1.07)   Depth: 17   00:00:02  1025kN
1.a3 Kg7 2.Kf3 Kf6 3.Kf4 Ke7 4.Kg5 b6 5.cxb6 axb6 6.a4 Kd6 7.Kxh5 Ke5 8.Kg5 f6+ 9.Kg6 Kd4 10.Ne2+ Ke3 11.Ng3 Nd5 12.Nh5
  +/-  (1.02)   Depth: 18   00:00:03  1488kN
1.Kf4 Kg7 2.b5 b6 3.c6 h4 4.Ne4 Nxb5 5.Kg4 f6 6.Kxh4 Kf7 7.Kh5 a6 8.Kg4 Ke7 9.Kf4 Nc7 10.Ke3 Nb5 11.a4 Nc7 12.Kd4 Ne8 13.Kd5 Nc7+ 14.Kc4 Ne8 15.Kd3 Nc7 16.Kd4
  +/-  (1.00)   Depth: 19   00:00:06  3358kN
1.Kf4 Kg7 2.b5 b6 3.c6 h4 4.Ne4 Nxb5 5.Kg4 f6 6.Kxh4 Kf7 7.Kh5 a6 8.Kg4 Ke7 9.Kf4 Nc7 10.Ke3 Nb5 11.a4 Nc7 12.Kd4 Ne8 13.Kd5 Nc7+ 14.Kc4 Ne8 15.Kd3 Nc7 16.Kd4
  +/-  (1.00)   Depth: 20   00:00:06  3423kN
1.Kf4 Kg7 2.a3 h4 3.Kg4 h3 4.Kxh3 Kf6 5.Kg4 Ke5 6.Kg5 a6 7.a4 Kd4 8.Ne2+ Ke5 9.Nf4 f6+ 10.Kg4 Ke4 11.Ne6 Nd5 12.b5 axb5 13.axb5
  +/-  (1.12 !)   Depth: 21   00:00:13  7134kN
1.Kf4 Kg7 2.a3 h4 3.Kg4 h3 4.Kxh3 Kf6 5.Kg4 Ke5 6.Kg5 a6 7.a4 Kd4 8.Ne2+ Ke5 9.Nf4 f6+ 10.Kg4 Ke4 11.Ne6
  +/-  (1.27 !)   Depth: 21   00:00:23  12066kN
1.Kf4 Kg7 2.a3 h4 3.Kg4 h3 4.Kxh3 Kf6 5.Kg4 Ke5 6.Kg5 a6 7.a4 Kd4 8.Ne2+ Ke5 9.Nf4 f6+ 10.Kg4 Ke4 11.Ne6
  +/-  (1.25)   Depth: 21   00:00:25  12772kN
1.Kf4 Kg7 2.a3 h4 3.Kg4 h3 4.Kxh3 Kf6 5.Kg4 Ke5 6.Kg5 a6 7.a4 Kd4 8.Ne2+ Ke5 9.Nf4 f6+ 10.Kg4 Ke4 11.Ne6
  +/-  (1.25)   Depth: 22   00:00:27  13671kN
1.Kf4 Kg7 2.a3 h4 3.Kg4 h3 4.Kxh3 Kf6 5.Kg4 Ke5 6.Kg5 a6 7.a4 Kd4 8.Ne2+ Kc4 9.Kf6 Nd5+ 10.Kxf7 Kxb4[] 11.c6 bxc6[] 12.Ke6 Kxa4 13.Nd4 Kb4 14.Kd6 a5 15.Nxc6+ Kc4 16.Nxa5+
  +/-  (1.25)   Depth: 23   00:00:35  18145kN
1.Kf4 Kg7[] 2.Kg5 h4 3.Kxh4 Kf6 4.Kg4 Ke5 5.Kg5 Kd4 6.Ne2+ Ke5 7.Nf4 f6+ 8.Kg4[] Ke4 9.a3 Nb5 10.a4 Nc3 11.Ne6 Nd5 12.b5 Ne3+ 13.Kh5[] Nxf5 14.Nd8 b6 15.c6 Ne7 16.Ne6
  +/=  (0.70)   Depth: 24   00:01:51  62954kN
1.b5 b6 2.c6 h4 3.a4 Kg7 4.Kf3 Kf6[] 5.Kf4 Ke7[] 6.Kg4 Kf6[] 7.Ne4+ Ke5[] 8.Ng5 Kf6[] 9.Nh3 Nd5 10.Nf4 Ne3+ 11.Kxh4 Kxf5 12.c7
  +/-  (1.00)   Depth: 24   00:03:19  109mN
1.Nd5 Nxd5[] 2.Kxd5 h4 3.Ke4 h3 4.Kf3 h2 5.Kg2 Kg7 6.a4 Kf6 7.b5 Kxf5 8.a5
  +/-  (1.37 !)   Depth: 24   00:03:21  110mN
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4 h3 4.Kf3 h2 5.Kg2 Kg7 6.a4 Kf6 7.b5 Kxf5 8.a5 f6 9.Kxh2 Ke5 10.c6
  +-  (1.98)   Depth: 24   00:03:25  112mN
1.Nd5 Nxd5 2.Kxd5 h4 3.Ke4[] h3 4.Kf3[] h2 5.Kg2[] Kg7 6.a4 Kf6 7.b5 Kxf5 8.a5 Ke6 9.c6
  +-  (1.98)   Depth: 25   00:03:34  116mN

(Prakash, Bhubaneswar 09.11.2011)

Gets it in 6 cores!!!
Up Topic The Rybka Lounge / Test Positions / Test position: Winning Move in the Endgame

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