test position: Szczepanski-Mamonovas, 2009

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jdart
Posts: 4367
Joined: Fri Mar 10, 2006 5:23 am
Location: http://www.arasanchess.org

test position: Szczepanski-Mamonovas, 2009

Post by jdart »

[D] 2b1Bbk1/5ppp/p3p3/8/1r3P2/4P3/P4P1P/3Q2K1 w - -

bm e4. I ran this on overnight analysis with Houdini 1.5a and got:

1. +- (2.63): 27.e4 Rc4 28.Qb3 Rxe4 29.Qc3 Bb7 30.f3 Rxf4 31.Qc7 Rf5 32.Qxb7 a5 33.Kg2 g6 34.h4 Bb4 35.a4 Kf8 36.Bc6

2. +- (1.41): 27.a3 Rc4 28.Qb3 Rc5 29.a4 a5 30.Qb6 e5 31.fxe5 Be6 32.Bb5 Bd5 33.f4 Rc1+ 34.Kf2 Rh1 35.Qxa5 Rxh2+ 36.Kg3

3. +/- (1.24): 27.h3 Rc4 28.Qb3 Rc5 29.Kg2 a5 30.Qb8 e5 31.fxe5 Be6 32.a4 Rc8 33.Qb5 Rc5 34.Qb2 Rc8 35.Bb5 g6 36.Ba6 Rc7 37.Qb6 Rc5 38.Qb8 Rc2 39.Qd8 Rc5 40.Qd4

If this is too easy for you, you can try this position from earlier in the game:

[D] r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23

Here White played Nc6!? - I don't even know if this is best but most engines I have tried have not found it - OTOH I have not run this one overnight.

The whole game:

[Event "1000 years to Lithuania"]
[Site "ICCF"]
[Date "2009.01.01"]
[Round "?"]
[White "Szczepanski, Zbigniew"]
[Black "Mamonovas, Viktoras"]
[Result "1-0"]
[ECO "E03"]
[WhiteElo "2555"]
[BlackElo "2521"]
[PlyCount "59"]
[EventDate "2009.??.??"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2 c5 8.
Nf3 Qc7 9. Bf4 Qb6 10. Nbd2 cxd4 11. O-O Nd5 12. Nc4 Qc5 13. Rac1 Nxf4 14. gxf4
Be7 15. Rfd1 O-O 16. Rxd4 Nf6 17. b4 Qxb4 18. Nd6 Qxd4 19. Nxd4 Bxd6 20. e3 Rd8
21. Qb3 Ne8 22. Rd1 Bf8 23. Nc6 Rxd1+ 24. Qxd1 bxc6 25. Bxc6 Rb8 26. Bxe8 Rb4
27. e4 Rc4 28. Qb3 Rb4 29. Qc3 Rxe4 30. Qc7 1-0

--Jon
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User avatar
Ajedrecista
Posts: 1971
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Spark is a genius!

Post by Ajedrecista »

Hello Jon:

Analysis by Spark 1.0 w32 (using two cores) in an Intel Pentium D930 (3 GHz), with 512 MB of hash, running under Arena 2.0.1 GUI:

[d]r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23
FEN: r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23

Spark-1.0-win32-mp:

1 00:00 1 0 +1,21 a2a4
1 00:00 26 0 +1,25 Bg2e4
1 00:00 34 0 +2,07 Bg2xb7

2/1 00:00 99 0 +1,41 Bg2xb7 Ra8b8

3/2 00:00 562 0 -0,79 Bg2xb7 Ra8b8 Nd4xe6 Rb8xb7 Ne6xd8 Rb7xb3 a2xb3
3/2 00:00 741 0 +1,01 f4f5 e6e5 Nd4f3
3/3 00:00 910 0 +1,12 Nd4e2 Ne8d6 Qb3d3
3/3 00:00 1.052 0 +1,37 Qb3b6 Rd8d7 Rd1c1
3/3 00:00 1.478 0 +1,42 Nd4f3 Ne8d6 Nf3e5

4/4 00:00 2.140 0 +1,43 Nd4f3 Ne8d6 Nf3e5 Bf8e7

5/5 00:00 3.905 0 +1,38 Nd4f3 Ne8d6 Nf3e5 f7f6 Qb3b6

6/6 00:00 13.700 0 +1,50 Nd4f3 Ne8d6 Nf3e5 Bf8e7 Ne5c4 Ra8a7 Nc4xd6 Be7xd6
6/7+ 00:00 21.470 0 +1,63 Nd4c6 Rd8xd1+
6/7 00:00 21.941 0 +1,82 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3

7/8 00:00 23.786 0 +1,58 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Bc8d7

8/8 00:00 39.880 0 +1,78 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Bc8d7 Nd3c5

9/10 00:00 62.898 0 +1,57 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Ra8a7 Nd3c5 b7b5
9/11 00:00 137.990 985.642 +1,63 Nd4f3 Ne8d6 Nf3e5 Rd8e8 Qb3a4 Re8d8 Qa4c2 f7f6 Qc2c7

10/11 00:00 178.117 952.497 +1,49 Nd4f3 Ne8d6 Nf3e5 Rd8e8 Qb3a4 b7b5 Qa4a5 Bc8b7 Bg2xb7 Nd6xb7
10/11 00:00 191.103 941.394 +1,67 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1b1 b7b5 Na5c6 Rb8b6 Nc6e5

11/13 00:00 277.833 935.464 +1,74 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Bf8e7 Qd1c2 Be7h4 Qc2c7 Nd6b5 Qc7c5 Ra8b8

12/18 00:00 421.626 1.081.092 +1,81 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Bg2xb7 Nd6xb7 Na5xb7

13/19 00:00 830.617 1.209.049 +1,96 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 f6f5 Qc2b2 Bc8d7 Na5xb7 Ra8c8 Nb7xd6 Bf8xd6

14/22 00:01 1.734.347 1.305.984 +2,16 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 g7g6 Qc2b2 f6f5 Qb2b6 h7h6 a2a4 Ra8b8 Na5c6

15/24 00:01 2.328.389 1.367.227 +2,15 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 g7g6 Qc2b2 f6f5 Qb2b6 h7h6 h2h4 Bc8d7 Bg2xb7 Ra8b8 Qb6xa6

16/24 00:02 3.477.446 1.493.748 +2,07 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Qb6c7 Be7f8 a2a4 Nd6e8 Qc7b6 Ne8d6 Na5xb7 Nd6xb7 Bg2xb7 Ra8b8

17/24 00:03 6.331.914 1.608.309 +2,13 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Qb6c7 Be7f8 a2a4 Nd6e8 Qc7b6 Ne8d6 h2h4 Ra8b8 Na5c6

18/27 00:07 11.444.768 1.578.588 +2,14 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1d4 b7b6 Na5c6 Rb8b7 Nc6e5 Rb7c7 Qd4xb6 Rc7c1+ Bg2f1 Bc8b7 Qb6b2 Rc1d1 Qb2c2 Rd1a1 h2h4

19/34 00:11 18.606.237 1.604.954 +2,16 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c1 Nd6e8 Na5c4 Bf8c5 Qc1c3 b7b5 Nc4e5 Bc5d6 Ne5c6 b5b4 Qc3d4 Rb8b5 Bg2e4 a6a5

20/34 00:17 28.839.187 1.605.030 +2,30 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c1 Nd6e8 Na5c4 Bf8c5 Qc1c3 f7f6 Bg2e4 b7b6 h2h4 Bc8b7 Qc3d3 Bb7xe4 Qd3xe4 Ne8c7 h4h5

21/42 00:46 70.508.715 1.505.213 +2,37 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c2 Nd6e8 Qc2d3 Bf8d6 Qd3d4 Bd6c7 Qd4c5 Bc8d7 Na5xb7 g7g6 Bg2c6 Ne8f6 Bc6xd7 Rb8xb7 Qc5d4 Rb7b1+ Kg1g2

22/42 01:27 131.326.176 1.508.421 +2,30 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Qd8b6 e6e5 Be8c6 Bb7xc6 Qb6xc6 e5xf4 e3xf4 Re7e6 Qc6c4 h7h6 f4f5 Re6f6 Qc4c8 Rf6b6 Kg1g2 a6a5

23/42 02:08 202.821.092 1.573.976 +2,37 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Be4f3 Qd8a5 g7g6 Qa5xa6 Re7c7 Bb3c4 Rc7c6 Qa6a8 Bf3e4 Qa8a4 Bf8e7 Bc4f1

24/44 03:05 294.834.289 1.586.068 +2,31 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 g7g6 Bb3c4 Re7b7 Bc4d3 Be4f3 Qd8a5 Rb7a7 Qa5b6 Ra7d7 Qb6xa6 Rd7d6 Qa6c4 Rd6c6

25/48 05:43 545.841.637 1.588.841 +2,29 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Re7b7 Qd8a8 h7h6 Qa8xa6 Rb7c7 Bb3c4 g7g5 f4xg5 Rc7c6 Qa6a4 h6xg5 Bc4f1 Be4d5 e3e4
25/54 10:00 921.811.175 1.535.353 +2,29 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Re7b7 Qd8a8 h7h6 Qa8xa6 Rb7c7 Bb3c4 g7g5 f4xg5 Rc7c6 Qa6a4 h6xg5 Bc4f1 Be4d5 e3e4
I stopped the analysis after ten minutes. I am still surprised on how fast Spark solved it (sticking with 23.- Nc6 from depth 10/11 and 203 ms of elapsed time in my slow PC, although this move was considered before, at depth 6/7+).

A tip, if any: never underestimate Spark in such positions! :P

Regards from Spain.

Ajedrecista.
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: test position: Szczepanski-Mamonovas, 2009

Post by kgburcham »

[D] r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - -

Houdini

34 137:40 +1.05 23.Nf3 Rxd1+ (151.373.649.564) 18324
34 137:40 +0.98 23.Nc6 Rxd1+ (151.373.649.564) 18324
34 137:40 +0.78 23.a4 Bd7 (151.373.649.564) 18324
34 137:40 +0.73 23.Ne2 Bd7 (151.373.649.564) 18324
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Dan Astrachan
Posts: 134
Joined: Fri May 28, 2010 11:07 am

Re: test position: Szczepanski-Mamonovas, 2009

Post by Dan Astrachan »

[D] 2b1Bbk1/5ppp/p3p3/8/1r3P2/4P3/P4P1P/3Q2K1 w - -

Ivanhoe999946h, 4-Gb hash

Code: Select all

 28	04:41	1 312 370 342	4 690 000	+1,31	a2-a3 Rb4-c4 Qd1-b3 Rc4-c5 Kg1-g2 a6-a5 Qb3-b8 e6-e5 f4xe5 Bc8-e6 Qb8-b2 Rc5-c4 f2-f4 Rc4-c8 Be8-a4 g7-g6 Kg2-g3 h7-h5 h2-h4 Kg8-h7 Ba4-c2 Bf8-e7 Bc2-d1 Rc8-d8 Bd1-e2 Kh7-g7 Qb2-c3 Rd8-d5 Be2-f1 Rd5-c5 Qc3-b2 Rc5-c8 Bf1-d3 Be7-c5
  29	05:49	1 628 687 934	4 683 000	+1,32	a2-a3 Rb4-c4 Qd1-b3 Rc4-c5 Kg1-g2 a6-a5 Qb3-b8 e6-e5 f4xe5 h7-h5 Qb8-b2 g7-g6 Be8-a4 Bc8-e6 f2-f4 Rc5-c7 Qb2-d2 Rc7-b7 Qd2-c1 Rb7-b8 e3-e4 Kg8-h7 Qc1-c3 Bf8-h6 f4-f5 g6xf5 e4xf5 Rb8-g8+ Kg2-f2 Be6xf5 Ba4-c2 Bf5xc2 Qc3xc2+ Kh7-g7 Qc2-c7
(...)
  30	1:38:25	53 374 050 649	9 039 000	+2,33	e3-e4 Rb4-c4 Qd1-b3 Rc4xe4 Qb3-c3 Bc8-b7 f2-f3 Re4xf4 Qc3-c7 Rf4xf3 Qc7xb7 Bf8-c5+ Kg1-g2 Rf3-f2+ Kg2-g3 h7-h5 a2-a4 g7-g5 Qb7xa6 g5-g4 Be8-b5 Rf2-f3+ Kg3-g2 Kg8-g7 Bb5-e2 Rf3-f2+ Kg2-g3 Rf2-f5 Qa6-c4 Rf5-d5 Kg3-g2 Bc5-b6 Qc4-c3+
Computer used: Intel Core i7 875K @ 2.93GH, 4 cores, 12 Gb of RAM
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: test position: Szczepanski-Mamonovas, 2009

Post by zullil »

jdart wrote:[D] 2b1Bbk1/5ppp/p3p3/8/1r3P2/4P3/P4P1P/3Q2K1 w - -

bm e4. I ran this on overnight analysis with Houdini 1.5a and got:

1. +- (2.63): 27.e4 Rc4 28.Qb3 Rxe4 29.Qc3 Bb7 30.f3 Rxf4 31.Qc7 Rf5 32.Qxb7 a5 33.Kg2 g6 34.h4 Bb4 35.a4 Kf8 36.Bc6

2. +- (1.41): 27.a3 Rc4 28.Qb3 Rc5 29.a4 a5 30.Qb6 e5 31.fxe5 Be6 32.Bb5 Bd5 33.f4 Rc1+ 34.Kf2 Rh1 35.Qxa5 Rxh2+ 36.Kg3

3. +/- (1.24): 27.h3 Rc4 28.Qb3 Rc5 29.Kg2 a5 30.Qb8 e5 31.fxe5 Be6 32.a4 Rc8 33.Qb5 Rc5 34.Qb2 Rc8 35.Bb5 g6 36.Ba6 Rc7 37.Qb6 Rc5 38.Qb8 Rc2 39.Qd8 Rc5 40.Qd4

Code: Select all

Critter v1.6a 64-bit, by Richard Vida
hardware POPCNT enabled
setoption name Hash value 4096
setboard 2b1Bbk1/5ppp/p3p3/8/1r3P2/4P3/P4P1P/3Q2K1 w - -
info string Opening book: "book.cbk" - 57853 entries [native]
info string GTB Init OK (5 piece set)
info string Using 8 thread(s), 4096 MB hash LP=off

    A   B   C   D   E   F   G   H
  +---+---+---+---+---+---+---+---+
8 |   |   | b |   | B | b | k |   |
  +---+---+---+---+---+---+---+---+
7 |   |   |   |   |   | p | p | p |
  +---+---+---+---+---+---+---+---+
6 | p |   |   |   | p |   |   |   |
  +---+---+---+---+---+---+---+---+
5 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
4 |   | r |   |   |   | P |   |   |
  +---+---+---+---+---+---+---+---+
3 |   |   |   |   | P |   |   |   |
  +---+---+---+---+---+---+---+---+
2 | P |   |   |   |   | P |   | P |
  +---+---+---+---+---+---+---+---+
1 |   |   |   | Q |   |   | K |   |
  +---+---+---+---+---+---+---+---+
FEN: 2b1Bbk1/5ppp/p3p3/8/1r3P2/4P3/P4P1P/3Q2K1 w - - 0 1
Hashkey: 6b722d8cff284e21 mgpsq: +0.15
Pawnkey: 1f6a14b8247c5d72 egpsq: -0.07
Mtrlkey: 9df5468e

go infinite
 2/ 2  00:00      457  228500  +0.67 Bc6 Rb2
 2/ 2  00:00      550  183333  +0.75 Qc2 Bb7
 3/ 5  00:00      726  242000  +0.99 Qc2 Bb7 Bc6
 4/ 5  00:00      996  249000  +1.00 Qc2 Bb7 Bc6 g6 Bxb7 Rxb7
 5/ 6  00:00     1417  283400  +1.03 Qc2 Bb7 Bc6 g6 Kg2
 6/ 7  00:00     2081  346833  +1.17 Qc2 Bb7 Bc6 g6 Kg2 Bc8
 7/ 9  00:00     3450  345000  +1.33 Qc2 Bb7 a3 Be4 Bxf7+ Kh8 Qc1 Rb1
 8/10- 00:00     5917  348058  +1.25 Qc2 Bb7 a3 Be4 Bxf7+ Kh8 Qc1 Rb1
 8/10  00:00     7790  370952  +1.25 Qc2 Bb7 Bc6 g6 Bxb7 Rxb7 Kg2 a5 Qc3
 9/12+ 00:00     9491  379640  +1.33 Qc2 Bb7 Bc6 g6 Bxb7 Rxb7 Kg2 a5 Qc3
 9/12  00:00    10685  395740  +1.30 Qc2 Bb7 Bc6 g6 Bxb7 Rxb7 Kg2 Rb8 Qc3 Rd8 Qc7
10/16  00:00    22966  499260  +1.38 Qc2 Bb7 Bc6 g6 Bxb7 Rxb7 Qc6 Rb1+ Kg2 a5 Qa4 Rb2 Qxa5
11/18  00:00    47614  573662  +1.45 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 Kg2 g6 Qc2 a4 Qc6 Rb2 Qxa4 Rd2
12/22- 00:00   162134  779490  +1.36 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 Kg2 g6 Qc2 a4 Qc6 Rb2 Qxa4 Rd2
12/22  00:00   182728  804969  +1.39 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 Qa6 Ra4 Qe2 g6 Kg2 Ra3 Qc4 Bg7
13/25- 00:00   327000  923728  +1.31 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 Qa6 Ra4 Qe2 g6 Kg2 Ra3 Qc4 Bg7
13/25  00:00   393810  955849  +1.32 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 Kg2 Rb2 a4 Rb4 Qd7 g6 Kg3 Kg7 h4 Rb3
14/25  00:00   511440   1063K  +1.29 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 h6 h3 Kg7 Kg3 Kg8 Qd7 Rb2 f3
15/28  00:00   803332   1226K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 h6 h3 Kg7 Kg3 Kg8 Qd7 Kg7 h4 Rb3 Kg4
16/30  00:00    1272K   1447K  +1.32 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Kg3 h5 Kg2 Kg8 h4 Rb3 Qc7
17/31  00:01    2398K   1812K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Kg3 h6 Kg2 Kg8 Qc6 Kg7 Kg3 Kg8 Qd7 Kg7
18/34  00:01    4951K   2649K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Qe8 h6 Qd7 Kg8 Kg3 Kg7 h4 Rb3 Kg4
19/34  00:02    7300K   3257K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Qe8 h6 Qd7 Kg8 Kg3 Kg7 h4 Rb3 Kg4
20/37  00:02   11977K   4201K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Qe8 h6 Qd7 Kg8 Kg3 Kg7 h4 h5 Kf3 Rb3 Qc7
21/39  00:03   20101K   5334K  +1.30 Qc2 Bb7 Bc6 Bxc6 Qxc6 a5 a4 g6 Kg2 Kg7 h3 Kg8 Qd7 Kg7 Qe8 Kg8 Qc6 Kg7 Kf3 h6 Kg2 Rb3 Qc2 Rb4 Qc3+ Kg8 Qc6 Kg7 Kg3 Kg8 Qd7 Kg7 h4 h5 Kf3 Kg8 Kg3 Kg7
21/42+ 00:09   81277K   8869K  +1.39 e4 Rxe4 Qc2 Bb7
21/44+ 00:12  118132K   9483K  +1.52 e4 Rxe4 Qc2 Bb7
21/49+ 00:19  191939K  10093K  +1.71 e4 Rxe4 Qc2 Bb7
21/52+ 00:33  347979K  10446K  +2.00 e4 Rc4 Qb3 Rb4 Qc2 Bb7 f3 Bd6 e5 Be7 a3 Rb6 Qc7 Rb1+ Kg2 Kf8 Bc6 Bxc6 Qxc6 Bxa3 Qxa6 Ra1 Qc8+ Ke7 Qc7+ Ke8 Qb8+ Ke7 Qa7+ Ke8 Qa8+ Ke7 Kg3 Rg1+ Kh3 Ra1 Qh8 g6 Qxh7 Bc5 Kg3
21/61  01:02  668162K  10638K  +1.97 e4 h6 Qc1 Bb7 f3 Bd6 Kg2 Kf8 Bc6 Bxc6 Qxc6 Ke7 e5 Rb2+ Kh3 Ba3 Qc7+ Ke8 Qc8+ Ke7 f5 exf5 Qxf5 Rxa2 Qc8 a5 Qc7+ Ke8 Qc4 Ra1 Qc8+ Ke7 Qc7+ Ke8 Qxa5 Ra2 Qd5 Ra1 Kg2 Be7 Qc6+ Kd8
22/61  01:11  759799K  10688K  +2.09 e4 h6 Qc1 Bb7 f3 Bd6 Kg2 Kf8 Bc6 Bxc6 Qxc6 Rb2+ Kg3 Ke7 Qxa6 g5 Qa7+ Ke8 Qa4+ Ke7 e5 Bb4 Qa7+ Kf8 fxg5 hxg5 Qd4 Be1+ Kg4 Rb4
23/61+ 01:55    1266M  11001K  +2.22 e4 h6 Qc1 Bb7 f3 Bd6 Kg2 Kf8 Bc6 Bxc6 Qxc6 Ke7 e5 Rb2+ Kh3 Ba3 Qc7+ Ke8 Qc8+ Ke7 f5 exf5 Qxf5 Rxa2 Qc8 a5 Qc7+ Ke8 Qc4 Ra1 Qc8+ Ke7 Qc7+ Ke8 Qxa5 Ra2 Qb5+ Ke7 Qb1 Rb2 Qh7 Rb3 Kg3 g6 Qxh6
23/61+ 02:55    1939M  11025K  +2.41 e4 h6 Qc1 Bb7 f3 Bd6 Kg2 Kf8 Bc6 Bxc6 Qxc6 Ke7 e5 Rb2+ Kh3 Ba3 Qc7+ Ke8 Qc8+ Ke7 f5 exf5 Qxf5 Rxa2 Qc8 a5 Qc7+ Ke8 Qc4 Ra1 Qc8+ Ke7 Qc7+ Ke8 Qxa5 Ra2 Qb5+ Ke7 Qb1 Rb2 Qh7 Rb3 Kg3 g6 Qxh6
23/68  04:44    3135M  11019K  +2.38 e4 Rc4 Qb3 Rc7 Qb8 Bd6 Kg2 Kf8 Bd7 Rxd7 Qxc8+ Ke7 e5 Bc7 Qxa6 Bd8 a4 Rd5 Qb7+ Ke8 Qc6+ Ke7 Kf3 h6 Qb7+ Kf8 Qc8 Ke8 Qc4 g6 Ke4 Kf8 h3 Kg7
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jdart
Posts: 4367
Joined: Fri Mar 10, 2006 5:23 am
Location: http://www.arasanchess.org

Re: test position: Szczepanski-Mamonovas, 2009

Post by jdart »

Nice job by Critter.

--Jon
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Carlos Ylich
Posts: 175
Joined: Wed Apr 28, 2010 9:31 pm
Location: Brazil

Hiacs book J version

Post by Carlos Ylich »

This is a move in the book of Hiarcs version J
Nc6!! :roll:
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Dan Astrachan
Posts: 134
Joined: Fri May 28, 2010 11:07 am

Re: test position: Szczepanski-Mamonovas, 2009

Post by Dan Astrachan »

[D] r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23

Ivanhoe 999946h, 4-gb hash:

Code: Select all

 31	1:20:12	55 060 366 897	11 444 000	+0,88	Nd4-e2 Bc8-d7 Qb3xb7 Bd7-b5 Rd1xd8 Ra8xd8 Ne2-d4 Ne8-d6 Qb7-b6 Rd8-c8 Nd4xb5 Rc8-c1+ Bg2-f1 a6xb5 Kg1-g2 Rc1-c2 Bf1xb5 Rc2xa2 Bb5-d3 Ra2-d2 Qb6-d4 g7-g6
  32	1:20:12	55 060 366 897	11 444 000	+0,94	Nd4-c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8-a7 Bc6xe8 Ra7-e7 Qd1-d8 Bc8-b7 Be8-d7 e6-e5 f4-f5 Bb7-f3 h2-h3 e5-e4 f5-f6 g7xf6 Bd7-g4 Bf3xg4 h3xg4 Re7-e6 Qd8-a5 Kg8-g7 a2-a4 Bf8-e7 Kg1-g2 Be7-f8 Kg2-f1 Re6-c6 Qa5-d5 Rc6-e6 Kf1-e2 Bf8-d6 Qd5-b7 a6-a5 Qb7-d7 Bd6-b4 Qd7-b7 Re6-e7 Qb7-d5
  32	1:20:12	55 060 366 897	11 444 000	+1,00	a2-a4 a6-a5 Nd4-b5 Bc8-d7 f4-f5 e6xf5 Bg2xb7 Ra8-b8 Bb7-d5 Ne8-f6 Bd5xf7+ Kg8-h8 Rd1-d4 Bf8-c5 Rd4-d3 Bd7-c6 Qb3-c3 Rd8xd3 Qc3xd3 Bc6-d7 Kg1-g2 Bc5-b4 Bf7-b3 Rb8-d8 Nb5-d4 f5-f4 e3-e4 Rd8-e8 f2-f3 Re8-e5
  32	1:20:12	55 060 366 897	11 444 000	+1,18	Nd4-f3 Rd8xd1+ Qb3xd1 Ne8-d6 Nf3-g5 Bc8-d7 Bg2xb7 Ra8-a7 Qd1-d3 g7-g6 Bb7xa6 Bd7-e8 f2-f3 Ra7-c7 Qd3-b3 Rc7-a7 Ba6-d3 Ra7-a8 Ng5-e4 Nd6xe4 f3xe4 Ra8-a4 Qb3-c2 Ra4-a3 Qc2-c4
Best move: Nf3
Computer used: Intel Core i7 875K @ 2.93GH, 4 cores, 12 Gb of RAM
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: test position: Szczepanski-Mamonovas, 2009

Post by zullil »

kgburcham wrote:[D] r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - -

Houdini

34 137:40 +1.05 23.Nf3 Rxd1+ (151.373.649.564) 18324
34 137:40 +0.98 23.Nc6 Rxd1+ (151.373.649.564) 18324
34 137:40 +0.78 23.a4 Bd7 (151.373.649.564) 18324
34 137:40 +0.73 23.Ne2 Bd7 (151.373.649.564) 18324
After I very long search---I forgot it was running---Critter also prefers Nf3:

Code: Select all

36/85  1016:16  823864M  13511K  +1.62 Nf3 Rxd1+ Qxd1 Nd6 Ng5 Bd7 Bxb7 Ra7 Qd3 g6 Bxa6 Be8 f3 Bc6 Ne4 Nxe4 fxe4 Bxe4 Qxe4 Rxa6 a4 Ra5 Kg2 Be7 Qc6 Ba3 Qd7 Bf8 Kf2 Kg7 Qd4+ Kg8 Kf3 Ra6 Qd7 Ra5 Qc6 Bg7 e4 Bf8 Qd7 Kg7 h3 Kg8 Kg4 h6 Kg3 Rc5 Qd4 Ra5 Kf3 g5 Qd1 Be7 Qd4 gxf4 e5 Rd5 Qxf4 Bg5 Qe4 Kg7 h4 Be7 Qg4+ Kf8
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Spark is a genius!

Post by bob »

Ajedrecista wrote:Hello Jon:

Analysis by Spark 1.0 w32 (using two cores) in an Intel Pentium D930 (3 GHz), with 512 MB of hash, running under Arena 2.0.1 GUI:

[d]r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23
FEN: r1brnbk1/1p3ppp/p3p3/8/3N1P2/1Q2P3/P4PBP/3R2K1 w - - 0 23

Spark-1.0-win32-mp:

1 00:00 1 0 +1,21 a2a4
1 00:00 26 0 +1,25 Bg2e4
1 00:00 34 0 +2,07 Bg2xb7

2/1 00:00 99 0 +1,41 Bg2xb7 Ra8b8

3/2 00:00 562 0 -0,79 Bg2xb7 Ra8b8 Nd4xe6 Rb8xb7 Ne6xd8 Rb7xb3 a2xb3
3/2 00:00 741 0 +1,01 f4f5 e6e5 Nd4f3
3/3 00:00 910 0 +1,12 Nd4e2 Ne8d6 Qb3d3
3/3 00:00 1.052 0 +1,37 Qb3b6 Rd8d7 Rd1c1
3/3 00:00 1.478 0 +1,42 Nd4f3 Ne8d6 Nf3e5

4/4 00:00 2.140 0 +1,43 Nd4f3 Ne8d6 Nf3e5 Bf8e7

5/5 00:00 3.905 0 +1,38 Nd4f3 Ne8d6 Nf3e5 f7f6 Qb3b6

6/6 00:00 13.700 0 +1,50 Nd4f3 Ne8d6 Nf3e5 Bf8e7 Ne5c4 Ra8a7 Nc4xd6 Be7xd6
6/7+ 00:00 21.470 0 +1,63 Nd4c6 Rd8xd1+
6/7 00:00 21.941 0 +1,82 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3

7/8 00:00 23.786 0 +1,58 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Bc8d7

8/8 00:00 39.880 0 +1,78 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Bc8d7 Nd3c5

9/10 00:00 62.898 0 +1,57 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6e5 f7f6 Ne5d3 Ra8a7 Nd3c5 b7b5
9/11 00:00 137.990 985.642 +1,63 Nd4f3 Ne8d6 Nf3e5 Rd8e8 Qb3a4 Re8d8 Qa4c2 f7f6 Qc2c7

10/11 00:00 178.117 952.497 +1,49 Nd4f3 Ne8d6 Nf3e5 Rd8e8 Qb3a4 b7b5 Qa4a5 Bc8b7 Bg2xb7 Nd6xb7
10/11 00:00 191.103 941.394 +1,67 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1b1 b7b5 Na5c6 Rb8b6 Nc6e5

11/13 00:00 277.833 935.464 +1,74 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Bf8e7 Qd1c2 Be7h4 Qc2c7 Nd6b5 Qc7c5 Ra8b8

12/18 00:00 421.626 1.081.092 +1,81 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Bg2xb7 Nd6xb7 Na5xb7

13/19 00:00 830.617 1.209.049 +1,96 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 f6f5 Qc2b2 Bc8d7 Na5xb7 Ra8c8 Nb7xd6 Bf8xd6

14/22 00:01 1.734.347 1.305.984 +2,16 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 g7g6 Qc2b2 f6f5 Qb2b6 h7h6 a2a4 Ra8b8 Na5c6

15/24 00:01 2.328.389 1.367.227 +2,15 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 f7f6 Qd1c2 g7g6 Qc2b2 f6f5 Qb2b6 h7h6 h2h4 Bc8d7 Bg2xb7 Ra8b8 Qb6xa6

16/24 00:02 3.477.446 1.493.748 +2,07 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Qb6c7 Be7f8 a2a4 Nd6e8 Qc7b6 Ne8d6 Na5xb7 Nd6xb7 Bg2xb7 Ra8b8

17/24 00:03 6.331.914 1.608.309 +2,13 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 g7g6 Qd1d4 Bf8e7 Qd4b6 h7h6 Qb6c7 Be7f8 a2a4 Nd6e8 Qc7b6 Ne8d6 h2h4 Ra8b8 Na5c6

18/27 00:07 11.444.768 1.578.588 +2,14 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1d4 b7b6 Na5c6 Rb8b7 Nc6e5 Rb7c7 Qd4xb6 Rc7c1+ Bg2f1 Bc8b7 Qb6b2 Rc1d1 Qb2c2 Rd1a1 h2h4

19/34 00:11 18.606.237 1.604.954 +2,16 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c1 Nd6e8 Na5c4 Bf8c5 Qc1c3 b7b5 Nc4e5 Bc5d6 Ne5c6 b5b4 Qc3d4 Rb8b5 Bg2e4 a6a5

20/34 00:17 28.839.187 1.605.030 +2,30 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c1 Nd6e8 Na5c4 Bf8c5 Qc1c3 f7f6 Bg2e4 b7b6 h2h4 Bc8b7 Qc3d3 Bb7xe4 Qd3xe4 Ne8c7 h4h5

21/42 00:46 70.508.715 1.505.213 +2,37 Nd4c6 Rd8xd1+ Qb3xd1 Ne8d6 Nc6a5 Ra8b8 Qd1c2 Nd6e8 Qc2d3 Bf8d6 Qd3d4 Bd6c7 Qd4c5 Bc8d7 Na5xb7 g7g6 Bg2c6 Ne8f6 Bc6xd7 Rb8xb7 Qc5d4 Rb7b1+ Kg1g2

22/42 01:27 131.326.176 1.508.421 +2,30 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Qd8b6 e6e5 Be8c6 Bb7xc6 Qb6xc6 e5xf4 e3xf4 Re7e6 Qc6c4 h7h6 f4f5 Re6f6 Qc4c8 Rf6b6 Kg1g2 a6a5

23/42 02:08 202.821.092 1.573.976 +2,37 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Be4f3 Qd8a5 g7g6 Qa5xa6 Re7c7 Bb3c4 Rc7c6 Qa6a8 Bf3e4 Qa8a4 Bf8e7 Bc4f1

24/44 03:05 294.834.289 1.586.068 +2,31 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 g7g6 Bb3c4 Re7b7 Bc4d3 Be4f3 Qd8a5 Rb7a7 Qa5b6 Ra7d7 Qb6xa6 Rd7d6 Qa6c4 Rd6c6

25/48 05:43 545.841.637 1.588.841 +2,29 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Re7b7 Qd8a8 h7h6 Qa8xa6 Rb7c7 Bb3c4 g7g5 f4xg5 Rc7c6 Qa6a4 h6xg5 Bc4f1 Be4d5 e3e4
25/54 10:00 921.811.175 1.535.353 +2,29 Nd4c6 Rd8xd1+ Qb3xd1 b7xc6 Bg2xc6 Ra8a7 Bc6xe8 Ra7e7 Qd1d8 Bc8b7 Be8a4 Bb7e4 Ba4b3 Re7b7 Qd8a8 h7h6 Qa8xa6 Rb7c7 Bb3c4 g7g5 f4xg5 Rc7c6 Qa6a4 h6xg5 Bc4f1 Be4d5 e3e4
I stopped the analysis after ten minutes. I am still surprised on how fast Spark solved it (sticking with 23.- Nc6 from depth 10/11 and 203 ms of elapsed time in my slow PC, although this move was considered before, at depth 6/7+).

A tip, if any: never underestimate Spark in such positions! :P

Regards from Spain.

Ajedrecista.
Is this in multi-PV mode? If so, the test doesn't mean much. The hard part is failing high on the second move, after getting a real score for the first. Multi-PV distorts the tree significantly and makes it easier to find that the second-best move is good because the alpha bound is lower than normal when searching the second move...
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