Testposition from Naum 4.1 match, not too difficult

Discussion of anything and everything relating to chess playing software and machines.

Moderator: Ras

User avatar
Eelco de Groot
Posts: 4662
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Testposition from Naum 4.1 match, not too difficult

Post by Eelco de Groot »

Here is a, more or less randomly chosen, testposition that shows a small shortcoming in Stockfish, from the match that Paul Watson played on his octal between Stockfish 1.6.3 and new Naum 4.1. Thanks for the match Paul!

Stockfish's king is lured far into enemy terrain and even though Naum with White does not have a Queen anymore, going this far behind enemy lines without assistance is not without its dangers. But Stockfish does not compute any King Safety when the opponent does not have a Queen... It does not see it.

[d]2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -

Naum plays 29. f3+! and gets a winning advantage while Stockfish evaluates at 0.00


[Event "0000-7160E6B413, Blitz:4'+2"]
[Site "0000"]
[Date "2010.02.03"]
[Round "32"]
[White "Naum 4.1"]
[Black "Stockfish 1.6.3 JA 64bit"]
[ECO "E59"]
[Result "1-0"]

1. d4 {B 0} Nf6 {B 0} 2. c4 {B 0} e6 {B 0} 3. Nc3 {B 0} Bb4
{B 0} 4. e3 {B 0} O-O {B 0} 5. Bd3 {B 0} d5 {B 0} 6. Nf3 {B
0} c5 {B 0} 7. O-O {B 0} dxc4 {B 0} 8. Bxc4 {B 0} Nc6 {B 0}
9. a3 {B 0} Bxc3 {B 0} 10. bxc3 {B 0} Qc7 {B 0 Both last
book move} 11. a4 {0.39/16 29} Rd8 {0.16/17 8 (b6)} 12. Qc2
{0.44/17 8 (Bb5)} b6 {0.08/18 10} 13. Bd3 {0.27/16 11} Bb7
{0.12/17 8} 14. Ba3 {0.11/16 9 (Bb2)} Na5 {0.00/17 8 (e5)}
15. Ne5 {0.00/16 8} c4 {0.00/18 13} 16. Be2 {0. 08/18 4}
Be4 {0.00/18 10} 17. Qb2 {0.10/18 4} Nd5 {0.00/19 8}
18. Bf3 {0.11/19 11} Bxf3 {0.00/19 6} 19. Nxf3 {-0.03/20
27} Nb3 {-0.08/20 11} 20. Ra2 {-0.06/ 19 16} f6 {-0.16/19 7
(a6)} 21. Qc2 {0.12/19 14 (Re1)} Qf7 {-0.08/18 8} 22. g3
{0.14/18 4 (e4)} Qg6 {0.00/18 7 (Qh5)} 23. Kg2 {0.14/17 7
(Qxg6)} Kf7 {-0.08/ 17 8} 24. Qxg6+ {0.13/18 6 (h3)} Kxg6
{0.00/18 6 (hxg6)} 25. Bb2 {0.20/19 6 (Rc2)} Kf5 {-0.20/17
8 (Ne7)} 26. Re1 {0.12/16 4 (h3)} Ke4 {0.00/19 7 (Kg4)}
27. h3 {0.12/16 6 (Ba1)} Rac8 {0.00/17 13} 28. Ng1 {0.22/17
4} e5 {0.00/18 5 (Ne7)} 29. f3+ {1.34/14 3} Kd3 {0.00/14 0}
30. Ne2 {1.26/16 5} exd4 {0.00/19 6} 31. Kf2 {1.34/17 6
(exd4)} dxe3+ {1.17/17 7} 32. Kg2 {1.38/17 3} Rc6 {1.45/19
13 (Nxc3)} 33. Ba1 {1.59/17 6} Nxc3 {1.57/18 6} 34. Bxc3
{1.79/17 3} Rcc8 {2. 06/19 8} 35. a5 {1.80/17 7 (Rd1+)} b5
{0.96/19 8} 36. a6 {2.81/16 4 (Rd1+)} h5 {2.42/16 7 (Nd2)}
37. Rd1+ {4.01/13 3 (Ba5)} Nd2 {2.66/6 0} 38. Bxd2 {4.77/16
2 } Kxe2 {4.20/17 6} 39. Re1+ {4.79/17 2} Kd3 {3.35/6 0}
40. Ba5 {4.95/18 2} c3 {4.68/17 4} 41. Bxd8 {5.26/14 15
(Rd1+)} c2 {4.96/18 7} 42. Raa1 {5.26/15 3 (Ra3+)} b4
{3.55/17 8 (Kc3)} 43. Be7 {5.30/17 3} Rc4 {4.36/18 7}
44. f4 {5.31/ 16 16 (Kf1)} Re4 {2.70/16 6 (e2)} 45. Bc5
{6.08/15 9} b3 {4.48/18 11 (e2)} 46. Ba3 {6.18/18 5} g5
{5.89/18 3 (h4)} 47. Kf3 {6.94/14 4 (Bc1)} Re8 {6.86/16 4
(e2)} 48. Bc1 {7.00/15 2} h4 {8.80/18 9 (e2)} 49. gxh4
{7.43/15 11 (Ra3)} gxf4 1-0


It is not hard to change King Safety so that even situations with less mating potential are considered, but the difficulty lies in the re-tuning.

It was already hard to change any of the parameters without upsetting the equilibrium, but in situations with less material not all the default values will apply. Stockfish will give too much value to the attack or too little for instance, depending on King Safety changes, in this position.

This is a reasonable try for a new version of King Safety in Rainbow Serpent but it has flaws in other positions and the "other" positions are always much more numerous :)

2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 90 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +0.80 29.Nf3 (208) 1

2.00 0:00 +0.92 29.Nf3 h6 (338) 2

2.00 0:00 +1.29 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 (739) 5

3.00 0:00 +1.29 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 (988) 7

4.00 0:00 +0.92 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 Nd5 (2.227) 17

4.00 0:00 +1.09 29.g4 Nc7 30.Nf3 Kd5 (3.429) 27

5.00 0:00 +1.41 29.g4 Nc7 30.Nf3 Nd5 31.dxe5 fxe5 (5.138) 41

6.00 0:00 +1.33 29.g4 Nc7 30.Nf3 Kd5 31.dxe5 fxe5
32.Rd1+ Ke6 (10.819) 76

7.00 0:00 +1.21 29.g4 Nc7 30.Ne2 Kd5 31.Ba3 exd4
32.exd4 Ne6 (28.586) 152

7.00 0:00 +1.81++ 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 g5
32.dxe5 fxe5 33.Ba3 (36.524) 179

8.00 0:00 +0.76 29.f3+ Kd3 30.Ne2 exd4 31.exd4 Re8
32.Kf2 Nxc3 33.Bxc3 Rxe2+ 34.Raxe2 Kxc3
35.Re7 Nxd4 36.Rxa7 Nc2 37.Re2 (117.556) 313

8.00 0:00 +1.05 29.g4 Nc7 30.Nf3 Kd5 31.dxe5 fxe5
32.Ba3 Nc5 33.Rd2+ Ke6 34.Bxc5 Rxd2
35.Nxd2 bxc5 36.Nxc4 (134.803) 331

8.00 0:00 +1.29 29.Nf3 h6 30.g4 g6 31.Rd1 exd4
32.exd4 Kf4 (163.475) 348

9.00 0:00 +0.28 29.Nf3 exd4 30.exd4+ Kf5 31.a5 Re8
32.g4+ Kg6 33.Rxe8 Rxe8 34.axb6 axb6
35.Ra7 Re2 (380.246) 398

9.00 0:01 +0.84 29.g4 Nc7 30.Nf3 Kd5 31.dxe5 fxe5
32.Ba3 Nc5 33.e4+ Ke6 34.Ng5+ Ke7
35.Bxc5+ bxc5 36.Nxh7 (402.393) 402

9.08 0:01 +0.92 29.a5 bxa5 30.Nf3 Nb4 31.cxb4 c3
32.Ba3 c2 33.b5 c1Q 34.Bxc1 Rxc1
35.Rxc1 Nxc1 36.Rxa5 (636.170) 433

10.01 0:02 +0.76 29.a5 bxa5 30.Nf3 exd4 31.Nxd4 Kd3
32.Rd1+ Ke4 33.f3+ Ke5 34.Kf2 Nxd4
35.exd4+ Kf5 36.Rxa5 (936.062) 440

10.02 0:02 +0.84 29.g4 Nc7 30.Nf3 Kd5 31.dxe5 fxe5
32.Ba3 Nc5 33.e4+ Ke6 34.Ng5+ Ke7
35.Bxc5+ bxc5 36.Nxh7 (974.842) 442

11.01 0:03 +0.32-- 29.g4 exd4 30.exd4+ Kd3 31.Ne2 Re8 (1.476.551) 463

11.08 0:05 +0.56 29.dxe5 Kxe5 30.e4 Nc7 31.Nf3+ Ke6
32.Ba3 Kf7 33.e5 Re8 34.Rae2 Nd5
35.e6+ Kg8 36.Rc2 Nc5 37.Bxc5 (2.653.486) 481

12.01 0:07 +0.28 29.dxe5 Kxe5 30.e4 Nc7 31.Nf3+ Ke6
32.Ba3 Kf7 33.Rae2 Kg8 34.e5 Nd5
35.exf6 gxf6 36.Bb2 Kg7 37.Nh4 (3.754.044) 488

13.01 0:12 +0.36 29.dxe5 Kxe5 30.e4 Nc7 31.Nf3+ Ke6
32.Ba3 Kf7 33.e5 Re8 34.Rae2 Nd5
35.e6+ Kg8 36.Rc2 Nc5 37.Bxc5 Rxc5
38.Rcc1 (6.427.203) 496

13.02 0:20 +0.52 29.a5 bxa5 30.Nf3 exd4 31.Nxd4 Kd3
32.Rd1+ Ke4 33.f3+ Ke5 34.Re1 Ne7
35.g4 Kd6 36.Ba3+ Kd7 37.Rd1 Nxd4
38.Rxd4+ Ke8 39.Bd6 (10.060.903) 493

14.01 0:29 +0.44 29.a5 bxa5 30.Nf3 exd4 31.Nxd4 Kd3
32.Rd1+ Ke4 33.f3+ Ke5 34.Re1 f5
35.e4 fxe4 36.fxe4 Nb6 37.Nf3+ Ke6
38.Ba3 Kf7 39.e5 Nc5 40.Nd4 Nd5
41.Rf2+ Kg8 (14.786.384) 500

14.03 0:34 +1.29++ 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kf1 Nd2+ 33.Kg2 Nb3 34.Ba1 Re8
35.Rd1+ Nd2 36.Nc1+ (17.312.356) 502

15.01 0:56 +2.10 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kf1 Nb4 33.cxb4 c3 34.Bxc3 Nd2+
35.Kg2 Rxc3 36.Nxc3 Kxc3 37.Rxe3+ Kxb4
38.Rb2+ Kxa4 39.Ra2+ Kb4 40.Rxa7 Nc4
41.Re2 g5 42.Rxh7 (28.404.728) 502

16.01 1:27 +2.30 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kf1 Nb4 33.cxb4 c3 34.Bxc3 Nd2+
35.Kg2 Rxc3 36.Nxc3 Kxc3 37.Rxe3+ Kxb4
38.Rb2+ Kxa4 39.Ra2+ Kb4 40.Rxa7 Nc4
41.Re6 Rg8 42.Ree7 (44.243.460) 504

17.01 1:52 +2.26 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Nc1 Rd8 36.Ba3 Nd2 37.Bb4 Kf5
38.a5 b5 39.Ne2 Nb3 40.a6 Rd3 (57.062.344) 508

18.01 2:30 +2.38 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Kf2 Rd8 36.Bc1 Rd3 37.Be3 Kf5
38.Rb2 Ke6 39.f4 Kd5 40.a5 bxa5
41.Bxa7 Ke4 42.fxe5 (76.505.481) 509

19.01 3:13 +2.42 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Kf2 Rd8 36.Bc1 Kf7 37.Be3 Kf6
38.g4 Ke6 39.f4 Rd3 40.Rc2 Nc5
41.Bxc5 bxc5 42.Kg2 (99.468.957) 514

20.01 4:28 +2.42 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 36.Ne2 Kf7 37.g4 Rd3
38.Nf4 Rxc3 39.Re2 Nc5 40.Bxc5 bxc5
41.Kf2 g5 42.Ne6 (139.290.229) 518

21.01 4:41 +2.22-- 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 (146.152.739) 519

22.01 10:15 +2.46 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 36.Ne2 Kf7 37.Kf2 g6
38.Bc1 Rd3 39.Be3 g5 40.Rb2 h6
41.Rb1 f5 42.f4 (322.806.606) 524

23.01 46:16 +2.54 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 36.Ne2 Kf7 37.Kf2 g6
38.Bc1 Rd1 39.Be3 g5 40.f4 h6
41.fxg5 fxg5 42.h4 (1.180.683.062) 425

24.01 122:49 +2.58 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 36.Ne2 Kf7 37.Kf2 g6
38.Bc1 Rd1 39.Be3 Rh1 40.Kg2 Re1
41.h4 Rd1 42.Nf4 (2.013.437.805) 273

best move: f2-f3 time: 130:25.593 min n/s: 278.228 nodes: 2.177.280.234

Eelco
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Testposition from Naum 4.1 match, not too difficult

Post by zullil »

Eelco de Groot wrote: But Stockfish does not compute any King Safety when the opponent does not have a Queen... It does not see it.

[d]2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -

Naum plays 29. f3+! and gets a winning advantage while Stockfish evaluates at 0.00
My Stockfish-1.6.3 (8 threads) chooses f3+ :

Code: Select all

Searching: 2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     -0.53   00:00      375 Nf3 a6 
 3     -0.61   00:00      777 Nf3 a6 Rd1 
 4     -0.32   00:00     1749 Nf3 a6 Rd1 exd4 exd4 
 5     -0.32   00:00     2791 Nf3 a6 Rd1 exd4 exd4 
 6     -0.40   00:00     8276 Nf3 h5 Rd1 g6 Ra3 exd4 exd4 
 7     -0.40   00:00    26118 Nf3 h6 Rd1 g5 Ra3 exd4 exd4 
 8     -0.36   00:00    37260 Nf3 h6 Rd1 g5 Rb1 Rc7 dxe5 fxe5 Rd1 
 9     -0.48   00:00   101491 Nf3 h6 Rd1 g5 g4 exd4 exd4 Nf4+ Kg3 Re8 h4 
10     -0.53   00:00   399955 Nf3 h6 Rd1 g5 Re1 Re8 Rd1 exd4 exd4 Kf5 Rb1 
11     -0.48   00:00    1146k Nf3 exd4 Nxd4 Kd3 Rd1+ Ke4 f3+ Ke5 Re1 Re8 h4 
                              Nxd4 exd4+ Kf5 
12  >  -0.28   00:00    1766k Nf3 h6 Nh2 exd4 exd4+ Kf5 Nf1 Re8 Ne3+ Nxe3+ fxe3 
                              Ke4 Kf2 
13     -0.53   00:01    2863k Nf3 exd4 exd4+ Kd3 Rf1 Re8 Ne1+ Ke4 Nc2 Nd2 Re1+ 
                              Kd3 Ba1 Nb3 Rd1+ Ke4 Bb2 Kf5 g4+ Ke4 f3+ 
13     +0.00   00:01    5584k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
14     +0.00   00:01    7355k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
15     +0.00   00:02   11588k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
16     +0.00   00:03   17669k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
17     +0.00   00:04   25957k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
18     +0.00   00:06   43157k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
19     +0.00   00:09   67700k f3+ Kd3 Ne2 exd4 exd4 Re8 Kf2 Ra8 Ba1 Rxe2+ Raxe2 
                              Nxa1 Rxa1 Kxc3 Rc1+ Kd3 Rd1+ Kc3 Rc1+ 
20  >  +0.20   00:17  143334k f3+ Kd3 Ne2 exd4 Kf2 dxe3+ Kg2 b5 Ba1 Nxc3 Bxc3 
                              b4 Bxb4 c3 Nf4+ Kc4 Bxc3 Kxc3 Rxe3+ Kc4 Re7 
21  >  +1.01   00:28  239873k f3+ Kd3 Ne2 e4 f4 h5 Kf2 h4 gxh4 
22     +1.21   01:23  713664k f3+ Kd3 Ne2 exd4 Kf2 dxe3+ Kg2 Kd2 Kf1 Kd3 Ba1 
                              Nxc3 Bxc3 Nd2+ Kg2 Nb3 Rd1+ Nd2 Bxd2 Kxe2 Re1+ 
                              Kd3 Rxe3+ Kd4 Kf2 Re8 Bc3+ Kc5 Rae2 Rxe3 Kxe3 
                              Re8+ Kd2 Rxe2+ Kxe2 
23     +1.41   02:32    1304M f3+ Kd3 Ne2 exd4 Kf2 dxe3+ Kg2 Kd2 Kf1 Kd3 Ba1 
                              Nxc3 Bxc3 Nd2+ Kg2 Nb3 Rd1+ Nd2 Bxd2 Kxe2 Re1+ 
                              Kd3 Rxe3+ Kd4 Kf2 Re8 Bc3+ Kc5 Rd2 Rxe3 Kxe3 Re8+ 
                              Kf4 Re7 Rd1 h5 Rd2 Re8 Rd7 
24     +1.49   05:31    2868M f3+ Kd3 Ne2 exd4 Kf2 dxe3+ Kg2 Kd2 Kf1 Kd3 Ba1 
                              Nxc3 Bxc3 Nd2+ Kg2 Nb3 Rd1+ Nd2 Bxd2 Kxe2 Re1+ 
                              Kd3 Rxe3+ Kd4 Kf2 Re8 Bc3+ Kc5 Rd2 Rxe3 Kxe3 Re8+ 
                              Kf4 Re7 Rd8 Kc6 Bd4 Kc7 Rh8 Kc6 Rc8+ Kd5 Rd8+ Kc6 
25     +1.49   07:44    4007M f3+ Kd3 Ne2 exd4 Kf2 dxe3+ Kg2 Kd2 Kf1 Kd3 Ba1 
                              Nxc3 Bxc3 Nd2+ Kg2 Nb3 Rd1+ Nd2 Bxd2 Kxe2 Re1+ 
                              Kd3 Rxe3+ Kd4 Kf2 Re8 Bc3+ Kc5 Rd2 Rxe3 Kxe3 Re8+ 
                              Kf4 Re7 Rd8 Rc7 Re8 Kd5 Kf5 Rd7 g4 h6 h4 a6 Re4 
                              Kc5 
Nodes: 4066352103
Nodes/second: 8621088
Best move: f3+
Ponder move: Kd3
Top
User avatar
Eelco de Groot
Posts: 4662
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Testposition from Naum 4.1 match, not too difficult

Post by Eelco de Groot »

zullil wrote: My Stockfish-1.6.3 (8 threads) chooses f3+ :
It does! I had not really expected that. Thanks Louis. Did not check with Stockfish vanilla though... So what I should have said is that Stockfish does not really see the danger, it should have avoided the position assuming the King march was not forced. Only at ply 21 does the eval for White go up enough. Choosing f3 early here is good though! It does see the move but under the game conditions would have needed more time for the King to not go strolling in a mine field, whistling a dainty tune, looking at the flowers, two powerful knights on horseback trying to protect him even in the enemy gardens but they are outnumbered...

Eelco
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
Top
User avatar
Eelco de Groot
Posts: 4662
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Testposition from Naum 4.1 match, not too difficult

Post by Eelco de Groot »

On further inspection, things are not so clear anymore, meaning I'm not sure the game is an example where King Safety computation with no enemy queen is really helping, in general, or is really a factor that is decisive here. So far it seems that the position might still be held but if so only if Black plays very precise. In the game, Stockfish with Black may have made the fatal mistakes only later, in the analysis the eval stops short of a winning advantage, for both version of Rainbow Serpent, the one using King Safety and the one without it. But these two have different PVs and also very different start evals, only much deeper the evals sort of converge.

The classic version is the more simple, intially thinks the eval is flat but if it is a draw, that is actually accurate. I let it run long, 27 ply analysis after some twelve hours and the eval is then higher. No King Safety is included in this.


2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 82 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 -0.68 29.Nf3 (283) 2

2.00 0:00 -0.52 29.Nf3 Rb8 (370) 2

3.00 0:00 -0.56 29.Nf3 Rb8 30.Rd1 (803) 6

4.00 0:00 -0.24 29.Nf3 Rb8 30.Rd1 exd4 31.exd4 (1.941) 15

5.00 0:00 -0.24 29.Nf3 h5 30.Rd1 exd4 31.exd4 (3.722) 29

6.00 0:00 -0.32 29.Nf3 h5 30.Rd1 g6 31.Ra3 exd4
32.exd4 (6.698) 47

7.00 0:00 -0.32 29.Nf3 h5 30.Rd1 Rd7 31.Re1 a6
32.Rd1 Rf8 (18.621) 119

8.00 0:00 -0.32 29.Nf3 h5 30.Rd1 Rd7 31.Re1 a6
32.Nh4 Rh8 33.Nf3 Rdd8 34.Rd1 Rhf8 (44.919) 221

9.00 0:00 -0.36 29.Nf3 h5 30.Rd1 Rd7 31.Re1 a6
32.Nh4 Rdd8 33.Ng6 Rb8 34.dxe5 fxe5
35.Rd1 (67.432) 269

10.00 0:00 -0.36 29.Nf3 h5 30.Rd1 Rd7 31.Re1 a6
32.Nh4 Rdd8 33.Ng6 Rb8 34.dxe5 fxe5
35.Rd1 (250.545) 411

11.00 0:00 -0.36 29.Nf3 h5 30.Rd1 Rd7 31.Re1 a6
32.Nh4 Rdd8 33.Ng6 Rb8 34.dxe5 fxe5
35.Rd1 (320.908) 437

12.01 0:03 -0.52 29.Nf3 exd4 30.exd4+ Kd3 31.Rf1 Re8
32.Ne1+ Ke4 33.Nf3 h5 34.Rb1 Kf5
35.Nh4+ Ke6 36.Nf3 Kf7 37.Rd1 (1.994.337) 557

12.07 0:07 -0.16++ 29.Ne2 Kd3 30.dxe5 fxe5 31.e4 Kxe4
32.Nd4+ Kd3 33.Nf3 e4 34.Ne5+ Kd2
35.Kf1 (3.964.362) 555

13.01 0:11 -0.12 29.Ne2 exd4 30.f3+ Ke5 31.Nxd4 Nxd4
32.exd4+ Kd6 33.Kf2 Re8 34.Raa1 f5
35.Rad1 Kd7 36.h4 Rxe1 37.Rxe1 (6.145.336) 555

14.01 0:14 -0.12 29.Ne2 exd4 30.f3+ Ke5 31.Nxd4 Nxd4
32.exd4+ Kd6 33.Kf2 Re8 34.Raa1 f5
35.Rad1 Kd7 36.h4 Kd6 37.Ba3+ Kc6
38.Bb2 Rxe1 39.Rxe1 Rb8 40.Re5 (8.047.432) 557

15.01 0:18 -0.24 29.Ne2 exd4 30.f3+ Ke5 31.Nxd4 Nxd4
32.exd4+ Kd6 33.Kf2 Re8 34.Raa1 f5
35.f4 Re4 36.Rxe4 fxe4 37.Re1 Re8
38.f5 Kc6 39.g4 Nf4 40.Kg3 (10.219.056) 566

15.02 0:29 0.00 29.f3+ Kd3 30.Ne2 exd4 31.exd4 Re8
32.Kf2 g5 33.Rd1+ Kc2 34.Re1 Kd3
35.Rd1+ (16.445.534) 566

16.01 0:44 0.00 29.f3+ Kd3 30.Ne2 exd4 31.exd4 Re8
32.Kf2 g5 33.Rd1+ Kc2 34.Re1 Kd3
35.Rd1+ (25.457.116) 567

17.01 1:09 0.00 29.f3+ Kd3 30.Ne2 exd4 31.exd4 Re8
32.Kf2 g5 33.Rd1+ Kc2 34.Re1 Kd3
35.Rd1+ (39.820.954) 571

18.01 2:18 +0.20++ 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxc3
32.Bxc3 Nxe3 33.Rc1 Rd4 34.Rb2 Re8
35.Bxd4 Nxc1 36.Bxe3 c3 37.Nxc1+ Kc4
38.Rb5 (77.816.140) 563

19.01 3:16 +0.56 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Kd2 33.Kf1 Kd3 34.Ba1 Nxc3
35.Bxc3 Nd2+ 36.Kg2 Re8 37.Ra3 Nb3
38.Bb4 g5 39.Nc1+ Kd4 40.Rd1+ Nd2
41.Ne2+ Kd5 42.Bc3 (110.287.339) 560

20.01 10:10 +1.29++ 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Kd2 33.Kf1 Kd3 34.Ba1 Nxc3
35.Bxc3 Nd2+ 36.Kg2 (335.336.964) 549

21.01 11:44 +1.17 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 Nxc3 34.Bxc3 Rcd8
35.Rd1+ Nd2 36.Raxd2+ exd2 37.Rxd2+ Ke3
38.Nd4 Rxd4 39.Rxd4 Re7 40.Rd1 Rc7
41.Rd6 Rb7 42.h4 (390.910.321) 554

22.01 27:00 +1.17 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 Nxc3 34.Bxc3 Rcd8
35.Rd1+ Nd2 36.Raxd2+ exd2 37.Rxd2+ Ke3
38.Nd4 Rxd4 39.Rxd4 Re7 40.Rd1 Rc7
41.Rd6 Rb7 42.h4 (892.792.206) 550

23.01 48:11 +1.25 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 Nxc3 34.Bxc3 Rcd8
35.Rd1+ Nd2 36.Raxd2+ exd2 37.Rxd2+ Ke3
38.Nd4 Rxd4 39.Rxd4 Re7 40.Rd1 Rc7
41.Rd6 g6 42.f4 (1.609.961.075) 556

24.01 89:11 +1.25 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 Nxc3 34.Bxc3 Rcd8
35.Rd1+ Nd2 36.Raxd2+ exd2 37.Rxd2+ Ke3
38.Nd4 Rxd4 39.Rxd4 Re7 40.Rd1 Rc7
41.Rd6 g6 42.f4 (2.947.295.716) 550

25.01 175:28 +1.45++ 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 (5.676.467.559) 539

26.01 191:21 +1.29 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Re8 33.Ba1 Nxc3 34.Bxc3 Rcd8
35.Rd1+ Nd2 36.Raxd2+ exd2 37.Rxd2+ Ke3
38.Nd4 Rxd4 39.Rxd4 Re7 40.g4 a6
41.Rxc4 Kd3 42.Rc6 (6.202.223.665) 540

27.01 786:06 +2.26 {The eval has gone up again! And 29...Kd3 is definitely the more interesting move. It may be just a draw still after all, even now this is not clear.} 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Nxc3 33.Bxc3 h6 34.Rd1+ Nd2
35.Bxd2 Kxe2 36.Re1+ Kd3 37.Rxe3+ Kd4
38.Kf2 Re8 39.Bc3+ Kc5 40.Rd2 Rxe3
41.Kxe3 Re8+ 42.Kf2 (25.569.456.904) 542

best move: f2-f3 time: 921:30.000 min n/s: 543.877 nodes: 30.069.540.210

The version with King safety thinks the King retreat to f5 is better, much less spectacular though, not trying to push a passed pawn through with King support on the sixth row although it is really still a middle game.

There are some other changes in search and even the Bishop pair material imbalance tables were changed to make this version behave better, in the Morozevich - Pelletier testposion especially that also deals with a similar problem, leafpositions with one side having two Rooks and the other a Queen, so King Safety is computed only for one side if there is still enough material on the board. In the end comparison it seems the King Safety changes are better not incorporated in the line, or maybe I should make two different versions :)


[d]2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 97 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +0.80 29.Nf3 (238) 1

2.00 0:00 +0.92 29.Nf3 h5 (361) 2

2.00 0:00 +1.13 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 (760) 5

3.00 0:00 +1.13 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 (1.010) 7

4.00 0:00 +0.76 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 Nd5 (2.277) 16

4.00 0:00 +0.92 29.g4 Nc7 30.Nf3 Kd5 (3.674) 23

5.00 0:00 +0.96 29.g4 h5 30.f3+ Kd3 31.Ne2 hxg4
32.hxg4 Kxe3 (6.243) 40

6.00 0:00 +1.17 29.g4 g6 30.Ne2 exd4 31.cxd4 c3
32.Ng3+ Kd3 (13.980) 81

7.00 0:00 +1.01 29.g4 g6 30.a5 b5 31.Ne2 exd4
32.Ng3+ Ke5 33.exd4+ Kd6 (44.936) 179

7.00 0:00 +1.61++ 29.f3+ Kd3 30.Ne2 Nxe3+ 31.Kf2 Ra8
32.dxe5 fxe5 33.Ba3 (52.592) 198

8.00 0:00 +0.44 29.f3+ Kd3 30.Ne2 e4 31.fxe4 Kxe4
32.Ba3 h5 33.Rb2 Kf5 34.Rf1+ Kg6 (104.159) 290

8.00 0:00 +1.01 29.g4 g6 30.a5 b5 31.Ne2 exd4
32.Ng3+ Ke5 33.exd4+ Kd6 (112.997) 289

8.00 0:00 +1.57 29.Nf3 h5 30.dxe5 fxe5 31.g4 Nf6
32.g5 Nd2 33.Nxd2+ Rxd2 34.gxf6 gxf6 (133.464) 317

9.00 0:00 +0.40 29.Nf3 exd4 30.exd4+ Kf5 31.a5 Re8
32.g4+ Kg6 33.axb6 Rxe1 34.Nxe1 axb6
35.Ra7 (265.582) 395

9.00 0:00 +1.01 29.g4 g6 30.Nf3 Kd3 31.dxe5 Nxc3
32.Ra3 Kc2 33.Bxc3 Kxc3 34.exf6 (314.744) 411

10.00 0:01 +0.60 29.g4 Re8 30.Ra3 Kd3 31.dxe5 Rxe5
32.Nf3 Kc2 33.Re2+ Kd3 34.Kf1 Ke4
35.Nxe5 fxe5 (793.377) 470

10.03 0:02 +0.76 29.f3+ Kd3 30.Ne2 e4 31.fxe4 Kxe4
32.Kf2 Kf5 33.a5 Nd2 34.axb6 axb6
35.g4+ Ke6 36.Nf4+ Nxf4 37.exf4+ Kd5 (1.256.296) 490

11.01 0:03 +0.52 29.f3+ Kd3 30.Ne2 e4 31.fxe4 Kxe4
32.Kf2 Re8 33.g4 Nxe3 34.Ba3 Rcd8
35.Ng3+ Kd3 36.Rae2 Kxc3 37.Rxe3+ Rxe3
38.Rxe3+ Kc2 (1.714.625) 492

11.04 0:04 +0.64 29.a5 bxa5 30.g4 h5 31.gxh5 Re8
32.dxe5 Rxe5 33.Ne2 Kf5 34.Rd1 Ke6
35.Ng3 Kf7 (2.455.557) 498

12.01 0:08 +0.36 29.a5 bxa5 30.g4 h5 31.gxh5 Re8
32.dxe5 Rxe5 33.Ne2 Kf5 34.Nd4+ Nxd4
35.cxd4 Nb4 36.e4+ Kg5 37.f4+ Kxh5
38.dxe5 Nxa2 39.exf6 c3 40.Bxc3 Nxc3
41.fxg7 (4.330.038) 501

12.02 0:09 +0.76 29.f3+ Kd3 30.Ne2 e4 31.fxe4 Kxe4
32.Kf2 h5 33.Nf4 Nxf4 34.exf4+ Kd5
35.Re7 Nd2 36.Rxg7 Ne4+ 37.Ke3 (5.006.421) 506

13.01 0:14 +1.13++ 29.f3+ Kd3 30.Ne2 e4 31.f4 Kc2
32.Kf2 (7.369.305) 519

14.01 0:21 +2.26 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Nd4 33.cxd4 c3 34.Ba1 c2
35.Kf1 Nb4 36.Nc1+ Kc4 37.Rb2 Rxd4
38.Rxb4+ Kxb4 39.Bxd4 Rd8 40.Bxe3 Kxa4 (11.044.776) 525

15.01 0:43 +2.14 29.f3+ Kf5 30.e4+ Kg6 31.exd5 exd4
32.cxd4 Rxd5 33.Ne2 Kf7 34.Nf4 Rdd8
35.Ba3 Nxd4 36.Re7+ Kg8 37.Rxa7 c3
38.Nh5 Nf5 39.Kf2 c2 40.Bc1 Rd1
41.g4 Rxc1 42.gxf5 (22.834.283) 529

16.01 1:06 +2.46 29.f3+ Kf5 30.e4+ Kg6 31.exd5 exd4
32.cxd4 Rxd5 33.Ne2 Kf7 34.Bc3 g5
35.h4 Re8 36.hxg5 fxg5 37.Rc2 h6
38.Bb2 Rc8 39.Nc3 Rxd4 40.Ne4 Rd3
41.Be5 (35.516.962) 535

17.01 1:08 +2.42 29.f3+ Kf5 30.e4+ Kg6 31.exd5 exd4
32.cxd4 Rxd5 33.Ne2 Kf7 34.Bc3 Re8
35.Nf4 Rd7 36.Rxe8 Kxe8 37.Re2+ Kf7
38.h4 g5 39.hxg5 Nxd4 40.Bxd4 Rxd4
41.Rc2 fxg5 42.Ne2 (36.644.948) 536

18.01 1:34 +2.34 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Ba3 Rd8 36.g4 Rd3 37.Bb4 a6
38.Ba3 Kf7 39.Rb2 Ke6 40.Rb1 Rd2
41.Kf2 (51.435.554) 543

19.01 2:08 +2.38 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Ba3 Rd8 36.g4 Rd3 37.Bb4 a6 38.f4 Kf6
39.fxe5+ Kxe5 40.Ng3 Nd2 41.Nf5 Ne4
42.Re2 (70.470.701) 548

20.01 3:02 +2.42 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Ba3 Rd8 36.g4 Rd3 37.Bb4 Kf7
38.a5 b5 39.a6 Ke6 40.Ng3 Nd2 41.Ne4 Nxe4
42.fxe4 (100.031.578) 548

21.01 5:11 +2.50 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rd2+ 33.Re2 Rxe2+ 34.Nxe2 fxe5
35.Ba3 Rd8 36.g4 Rd3 37.Bb4 a5
38.Ba3 Kf7 39.Rb2 Ke6 40.h4 g6
41.Bf8 h5 42.Bh6 (172.626.937) 553

22.01 6:50 +2.30-- 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Rcc5 34.Ba3 Ra5
35.Bb4 Rad5 36.Rxd5 Rxd5 37.Ne2 Kf7
38.Nf4 Rd7 39.Re2 g5 40.Ne6 Rd3
41.Kf2 Nc1 (233.722.976) 569

23.01 20:36 +2.30 29.f3+ Kd3 30.Ne2 exd4 31.Kf2 dxe3+
32.Kg2 Rd7 33.Ba1 Nxc3 34.Bxc3 Rdd8
35.Rb2 Nd2 36.a5 b5 37.a6 Rd5 38.Ra2 Rdd8
39.g4 Rc6 40.h4 Rdd6 41.Ra3 Nb3
42.Ra2 (705.570.650) 570

24.01 82:52 +2.58 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Nc5 34.Ba3 Nd3
35.Ne2 Rd8 36.Nd4 Ne1+ 37.Kf2 Nd3+
38.Kf1 Nc5 39.Bc1 Nb3 40.Kf2 Ree8
41.a5 Nxd4 42.axb6 (2.802.416.315) 563

25.01 95:57 +2.62 {Approaching Ippolit speeds here :P I mean this is fast for an 2005 stock Athlon. It's almost as if I have Louis Zulli's machine with eight threads, and I have not even included the eight core patch from Marco and Joona or any of the other fixes that weren't out yet :!: } 29.f3+ Kf5 30.e4+ Kg6 31.exd5 Rxd5
32.dxe5 Rxe5 33.Rd1 Ree8 34.Ba3 Rcd8
35.Rxd8 Rxd8 36.Kf2 Rd7 37.Re2 Rd3
38.Re3 Rd2+ 39.Ne2 Ra2 40.Bf8 Kf7
41.Bd6 Kg6 42.g4 (3.274.836.144) 568

best move: f2-f3 time: 100:10.281 min n/s: 571.472 nodes: 3.434.700.358

-Eelco
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
Top
User avatar
beachknight
Posts: 3533
Joined: Tue Jan 09, 2007 8:33 pm
Location: Antalya, Turkey

Re: Testposition from Naum 4.1 match, not too difficult

Post by beachknight »

Code: Select all

11: 2rr4/p5pp/1p3p2/3np3/P1pPk3/1n
2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - - 0 1

Analysis by Stockfish 1.6.2 JA 64bit:

1.Ne2 exd4 2.f3+ Ke5 3.Nxd4 Nxd4 4.exd4+ Kd6 5.Ba3+ Kd7 6.Bb2 Re8 7.Raa1 f5 8.Kf2 f4 9.Re4 fxg3+ 10.Kxg3 
  =  (-0.24)   Depth: 14   00:00:01  5088kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 14   00:00:02  7704kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 15   00:00:03  11929kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 16   00:00:04  16769kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 17   00:00:07  26326kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 18   00:00:11  44768kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 19   00:00:20  82235kN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 20   00:00:33  134mN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 21   00:00:59  242mN
1.f3+ Kd3 2.Ne2 exd4 3.exd4 g5 4.Kf2 Re8 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 22   00:01:50  450mN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 g6 5.Ba1 Nxc3 6.Bxc3 Re8 7.Rd1+ Nd2 8.Rdxd2+ exd2 9.Rxd2+ 
  =  (0.20 !)   Depth: 23   00:04:59  1224mN
1.f3+ Kd3 2.Ne2 e4 3.f4 Rb8 4.Kf2 Rdc8 5.Rd1+ Kc2 6.Ke1 
  +/-  (1.01 !)   Depth: 24   00:07:14  1767mN

(, chessengines20 06.02.2010)
hi, merhaba, hallo HT
Top
User avatar
beachknight
Posts: 3533
Joined: Tue Jan 09, 2007 8:33 pm
Location: Antalya, Turkey

Re: Testposition from Naum 4.1 match, not too difficult

Post by beachknight »

Code: Select all

11: 2rr4/p5pp/1p3p2/3np3/P1pPk3/1n
2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - - 0 1

Analysis by Naum 4.1:

1.f3+ Kd3 2.Ne2 exd4 3.exd4 Re8 4.Kf2 g5 5.h4 gxh4 6.gxh4 h5 
  =  (0.14)   Depth: 12/33   00:00:00  1786kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kf1 g5 5.Ba1 Nxc3 6.Bxc3 Nd2+ 7.Kg2 
  +/-  (0.93)   Depth: 13/43   00:00:03  8247kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kf1 Rd7 5.Ba1 Nd2+ 6.Kg2 Nxc3 7.Nxc3 Rcc7 
  +/-  (0.93)   Depth: 14/49   00:00:05  15526kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Nxc3 5.Bxc3 h6 6.Ba1 c3 7.Bxc3 Rxc3 8.Nxc3 
  +/-  (1.40)   Depth: 15/59   00:00:23  77176kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Nxc3 5.Bxc3 h6 6.Ba1 c3 7.Bxc3 Rxc3 8.Nxc3 Kxc3 
  +/-  (1.32)   Depth: 16/46   00:00:25  83007kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Nxc3 5.Bxc3 h6 6.Ba1 c3 7.Bxc3 Rxc3 8.Nxc3 Kxc3 9.Rxe3+ 
  +/-  (1.32)   Depth: 17/44   00:00:29  95797kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Nxc3 5.Bxc3 h6 6.h4 Nd2 7.Bb4 c3 8.Nxc3 Rxc3 9.Bxc3 Kxc3 
  +-  (1.55)   Depth: 18/58   00:00:55  185mN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Nb4 5.cxb4 c3 6.Bxc3 Rxc3 7.Nxc3 Kxc3 8.Rxe3+ Kxb4 9.Re7 g5 10.Rxa7 
  +-  (1.57)   Depth: 19/62   00:03:06  655mN, tb=11
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 h6 5.Ba1 Nxc3 6.Bxc3 a6 7.h4 Rc6 8.Rd1+ Nd2 9.Bxd2 Kxe2 10.Re1+ Kd3 
  +-  (1.69)   Depth: 20/62   00:09:36  2073mN, tb=756

(, chessengines20 06.02.2010)
hi, merhaba, hallo HT
Top
govert
Posts: 270
Joined: Thu Jan 15, 2009 12:52 pm

Re: Testposition from Naum 4.1 match, not too difficult

Post by govert »

I'd be interested to see the output of Rybka on this one.
Top
User avatar
beachknight
Posts: 3533
Joined: Tue Jan 09, 2007 8:33 pm
Location: Antalya, Turkey

Re: Testposition from Naum 4.1 match, not too difficult

Post by beachknight »

Code: Select all

11: 2rr4/p5pp/1p3p2/3np3/P1pPk3/1n
2rr4/p5pp/1p3p2/3np3/P1pPk3/1nP1P1PP/RB3PK1/4R1N1 w - - 0 1

Analysis by Crafty 22.09 cb w32:

1.Ne2 exd4 2.f3+ Kd3 3.exd4 Re8 4.Kf2 f5 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 12/27   00:00:01  6806kN
1.Ne2 exd4 2.f3+ Kd3 3.exd4 Re8 4.Kf2 f5 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 13/29   00:00:02  10094kN
1.Ne2 exd4 2.f3+ Kd3 3.exd4 Re8 4.Kf2 f5 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 14/31   00:00:03  15785kN
1.Ne2 exd4 2.f3+ Kd3 3.exd4 Re8 4.Kf2 f5 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 15/34   00:00:05  26113kN
1.Ne2 exd4 2.f3+ Kd3 3.exd4 Re8 4.Kf2 f5 5.Rd1+ Kc2 6.Re1 Kd3 
  =  (0.00)   Depth: 16/34   00:00:12  59998kN
1.Ne2 exd4 2.Nxd4 Nxd4 3.exd4+ Kd3 4.Ba1 Re8 5.Rd1+ Ke4 6.Re2+ Kf5 7.Rde1 Rxe2 8.Rxe2 Rd8 9.Kf3 a6 10.g4+ Kg5 11.Bb2 
  =  (0.17)   Depth: 17/37   00:00:49  248mN
1.f3+ 
  +/=  (0.40)   Depth: 17/38   00:01:09  81815kN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxc3 4.Bxc3 Nxe3 5.Rc1 Rd4 6.Rb2 Re4 7.fxe4 Nxc1 8.Rd2+ Kxe4 9.Rd4+ Kf5 10.Nxc1 Nc2 
  +/=  (0.42)   Depth: 17/38   00:01:12  363mN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxc3 4.Bxc3 Nxe3 5.Rc1 Rd4 6.Rb2 Re4 7.fxe4 Nxc1 8.Rd2+ Kxe4 9.Rd4+ Kf5 10.Nxc1 Nc2 
  +/-  (0.82)   Depth: 18/37   00:01:26  428mN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Kd2 5.Kf1 Kd3 6.Ba1 Nxc3 7.Bxc3 Nd2+ 8.Kg2 Re8 9.Ra3 Nb3 
  +/-  (1.23)   Depth: 18/38   00:02:00  597mN
1.f3+ Kd3 2.Ne2 exd4 3.Kf2 dxe3+ 4.Kg2 Kd2 5.Kf1 Kd3 6.Ba1 Nxc3 7.Bxc3 Nd2+ 8.Kg2 h5 9.Rb2 Nb3 10.Rd1+ Nd2 11.Bxd2 Kxe2 12.Re1+ Kd3 13.Rxe3+ Kd4 
  +/-  (1.28)   Depth: 19/39   00:02:28  737mN

(, chessengines20 06.02.2010)
hi, merhaba, hallo HT
Top

Return to “Computer Chess Club: General Topics”