Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Another test position

Author: Anthony Cozzie

Date: 21:48:48 12/02/02

Go up one level in this thread


>>>>How long do your engines need to find Nc6! with a huge white advantage (at least
>>>>+2)?
>>>>[D] kb2r1qr/pp3b2/1p2p3/1Pn1pp1n/R2N2pP/1PN1BPP1/4PQB1/R4K2 w - - 0 1

>Even depth 13 after Nc6 is not enough for latest movei to see more than +2 for
>white so I guess that it needs at least depth 15 from the root position that may
>mean many hours.
>
>depth=13 -1.85 c5a4 c3a4 b7c6 b5c6 b8c7 a4b6 c7b6 e3b6 h5g3 f2g3 e8e7 c6c7 a8b7
>f3g4 b7b6 g3e3 b6c7 a1a7 c7d8 e3b6 d8c8 a7a8 c8d7 a8g8 h8g8
>Nodes: 314049824 NPS: 132147
>Time: 00:39:36.51
>
>Uri

don't feel bad uri.  At depth 15 zappa goes nuts (I'm 90% sure this a hashtable
problem). It'd probably take a 16 ply search to see a large white advantage.

1. Nc6 Nxa4 2. Nxa4 Bc7 3. Bxb6 gxf3 4. Bxc7
 = (-2.67)      Depth: 7        00:00:01.77     443kN
1. Nc6 Nxa4 2. Nxa4 Nxg3 3. Qxg3 Bd6 4. fxg4 fxg4 5. Nxa7
 + (-2.42)      Depth: 8        00:00:02.31     633kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. fxg4 e4 4. gxh5 Bxg3
 = (-1.73)      Depth: 8        00:00:02.97     898kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. fxg4 e4 4. gxh5 Bxg3 5. Nxb6 Kb8
 = (-1.73)      Depth: 9        00:00:04.34     1439kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. fxg4 e4 4. gxh5 Bxg3 5. Nxb6 Kb8 6. Nd7 Kc8
 = (-1.73)      Depth: 10       00:00:07.60     2758kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. fxg4 Nxg3 4. Qxg3 e4 5. Rd1
 - (-1.98)      Depth: 11       00:00:13.37     5006kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. fxg4 Nxg3 4. Qxg3 e4 5. Qh3 cxb5 6. Nxb6 Kb7 7. Nd7
 = (-2.40)      Depth: 11       00:00:22.30     8687kN
1. Nc2 gxf3 2. Bxc5 fxg2 3. Kg1 Rc8 4. Bxb6 Nxg3 5. Bxa7 Bc7
 + (-2.15)      Depth: 12       00:01:28.97     35217kN
1. Nc2 Nxb3 2. R1a3 gxf3 3. Bxf3 Nxg3 4. Ke1 Nc5 5. Bxc5 bxc5 6. b6 e4 7. bxa7
Be5
 = (-1.85)      Depth: 12       00:01:59.94     48012kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Nxg3 6. Qxg3 e4 7.
fxg4
 + (-1.60)      Depth: 13       00:03:22.40     81663kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Kb8 6. Bxa7 Kc8 7. Bb6
Nxg3 8. Qxg3 gxf3
 = (-1.42)      Depth: 13       00:03:33.76     86728kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Nxg3 6. Qxg3 e4 7.
fxg4 e3 8. Bxa7 e5
 + (-1.17)      Depth: 14       00:04:05.06     99973kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 gxf3 6. Rxa7 Kb8 7.
Rb7 Kc8 8. Rc7 Kb8 9. Rb7
 = (0.00)       Depth: 14       00:06:00.22     146436kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6
 - (-0.25)      Depth: 15       00:08:35.44     204607kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Nxg3 6. Qxg3 Qg6 7.
fxg4 f4 8. Rxa7 Kb8 9. Qh3 Qb1 10. Kf2
 + (0.25)       Depth: 15       00:11:58.43     285469kN
1. Nc6 Nxa4 2. Ra3 bxc6
 - (-0.25)      Depth: 15       00:13:08.55     311984kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Nxg3 6. Qxg3 Rxh4 7.
Qxh4 e4
 + (0.75)       Depth: 15       00:15:58.81     380473kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. Bh1 cxb5
 - (-0.25)      Depth: 15       00:17:31.85     415340kN
1. Nc6 Nxa4 2. Nxa4 bxc6 3. bxc6 Bc7 4. Nxb6 Bxb6 5. Bxb6 Kb8 6. Bxa7 Kc8 7. Bb6
Kb8 8. Bc7 Kc8 9. Bxe5 Nxg3 10. Qxg3 gxf3
 = (0.36)       Depth: 15       00:19:53.83     473065kN



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.