Any engine?

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Dhanish
Posts: 42
Joined: Thu Jan 09, 2014 2:55 pm

Any engine?

Post by Dhanish »

Is there any engine which plays 19. Nd2 in this position:
[D]r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b1N2/P4PPP/2BR2K1 w - - 0 19
It occurred in a correspondence game of mine, I don't know how my opponent found it.
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Werewolf
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Re: Any engine?

Post by Werewolf »

How sure are you Nd2 is the best move?
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Werewolf
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Re: Any engine?

Post by Werewolf »

Anyway, to answer your question, Rybka 4.1 gets Nd2 in a couple of seconds on my machine and it seems to stick with it.
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zullil
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Full name: Louis Zulli

Re: Any engine?

Post by zullil »

Dhanish wrote:Is there any engine which plays 19. Nd2 in this position:
[D]r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b1N2/P4PPP/2BR2K1 w - - 0 19
It occurred in a correspondence game of mine, I don't know how my opponent found it.
Seems like a good test position. Stockfish hasn't found Nd2:

Code: Select all

info depth 46 seldepth 62 score cp 12 nodes 39037567868 nps 21451747 time 1819785 multipv 1 pv f3e1 d3g6 a2a4 g8e7 c1d2 e7c8 d1c1 c6c7 e1c2 g6c2 c1c2 f8e7 c2b2 a8b8 a4a5 b8b7 a6b5 c7b8 g2g3 h6h5 f2f4 g7g6 g1g2 e7d8 h2h3 b8a8 d2c3 c8e7 b2b1 e7c8 g2f2 h8g8 f2f3 g8h8 f3g2 a8b8
but sees it is good if asked to search just that move:

Code: Select all

info depth 46 seldepth 75 score cp 85 nodes 14279051298 nps 20135956 time 709132 multipv 1 pv f3d2 c6c7 d2b3 f8b4 b3c5 b4c5 d4c5 g8e7 c1e3 d5d4 e3d4 e7d5 a2a4 h8c8 a6b5 c7b7 c5b6 a7b6 d4b6 d5b6 a4a5 a8a6 h2h3 h6h5 d1c1 c8d8 a5b6 a6b6 b5c5 d8c8 c5a3 b6a6 a3b2 a6b6 b2a2 b6a6 a2d2 g7g6
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reflectionofpower
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Re: Any engine?

Post by reflectionofpower »

Dhanish wrote:Is there any engine which plays 19. Nd2 in this position:
[D]r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b1N2/P4PPP/2BR2K1 w - - 0 19
It occurred in a correspondence game of mine, I don't know how my opponent found it.
Most of my engines and I have them all like 19)a4. Several liked the move 19)Ne1
"Without change, something sleeps inside us, and seldom awakens. The sleeper must awaken." (Dune - 1984)

Lonnie
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reflectionofpower
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Re: Any engine?

Post by reflectionofpower »

Werewolf wrote:Anyway, to answer your question, Rybka 4.1 gets Nd2 in a couple of seconds on my machine and it seems to stick with it.
weird. I have an Intel(R) Core(TM) i7-3630QM CPU @ 2.40GHz and it likes the 19)a4 move running on 4 cores.



New game
r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b1N2/P4PPP/2BR2K1 w - - 0 1

Analysis by Deep Rybka 4.1 SSE42 x64:

19.a4 Ne7 20.Nd2 Ng6 21.Nb3 Kc7[] 22.Na5 bxa5[] 23.Qxa5+ Kd7 24.Qb5+ Kc7 25.Qa5+ Kd7 26.Qb5+ Kc7 27.Qa5+ Kd7 28.Qb5+ Kc7 29.Qa5+ Kd7 30.Qb5+ Kc7 31.Qa5+ Kd7 32.Qb5+ Kc7 33.Qa5+ Kd7 34.Qb5+
= (0.00) Depth: 21 00:01:36 30430kN
(Cook, 07.08.2014)
"Without change, something sleeps inside us, and seldom awakens. The sleeper must awaken." (Dune - 1984)

Lonnie
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Dhanish
Posts: 42
Joined: Thu Jan 09, 2014 2:55 pm

Re: Any engine?

Post by Dhanish »

>How sure are you Nd2 is the best move?

Not sure, but I had to struggle hard for the draw.

>Anyway, to answer your question, Rybka 4.1 gets Nd2 in a couple of seconds on my machine and it seems to stick with it.

Yes, Rybka 4.1 seems to like Nd2 for depths at least upto 26, but thinks it is 0.00! After 19. Nd2 Kc7 20. Nb3 Ne7, White seems to be winning! For details, please see my annotation at: http://pbdhanish.blogspot.in/2014/04/70 ... ss-in.html.
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Eelco de Groot
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Re: Any engine?

Post by Eelco de Groot »

zullil wrote:
Dhanish wrote:Is there any engine which plays 19. Nd2 in this position:
[D]r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b1N2/P4PPP/2BR2K1 w - - 0 19
It occurred in a correspondence game of mine, I don't know how my opponent found it.
Seems like a good test position. Stockfish hasn't found Nd2:

Code: Select all

info depth 46 seldepth 62 score cp 12 nodes 39037567868 nps 21451747 time 1819785 multipv 1 pv f3e1 d3g6 a2a4 g8e7 c1d2 e7c8 d1c1 c6c7 e1c2 g6c2 c1c2 f8e7 c2b2 a8b8 a4a5 b8b7 a6b5 c7b8 g2g3 h6h5 f2f4 g7g6 g1g2 e7d8 h2h3 b8a8 d2c3 c8e7 b2b1 e7c8 g2f2 h8g8 f2f3 g8h8 f3g2 a8b8
but sees it is good if asked to search just that move:

Code: Select all

info depth 46 seldepth 75 score cp 85 nodes 14279051298 nps 20135956 time 709132 multipv 1 pv f3d2 c6c7 d2b3 f8b4 b3c5 b4c5 d4c5 g8e7 c1e3 d5d4 e3d4 e7d5 a2a4 h8c8 a6b5 c7b7 c5b6 a7b6 d4b6 d5b6 a4a5 a8a6 h2h3 h6h5 d1c1 c8d8 a5b6 a6b6 b5c5 d8c8 c5a3 b6a6 a3b2 a6b6 b2a2 b6a6 a2d2 g7g6
I t seems that 19... Kc7 20. Nb3 Ne7 and 19... Ne7 20. Nb3 Kc7 mostly transpose, but maybe playing Bb4 helps a bit for Black as in your main line. My Stockfish version also can't find Nd2 but if you play it, eventually sees Nd2-Nb3-Nc5!

After 19. Nd2 Stockfish usually around depth 40 sees something:


[D]r4bnr/p4pp1/Qpk1p2p/3pP3/2pP4/3b4/P2N1PPP/2BR2K1 b - -

Engine: Sf20140727_016 MOD MP (512 MB)
by Tord Romstad, Marco Costalba and Joona Kiiski

39 4:08 0.00 1...Kc7 2.Nb3 Ne7 3.Na5 bxa5 4.Qxa5+ Kd7
5.Qb5+ Kd8 6.Qa5+ Ke8 7.Qa4+ Kd8
8.Qa5+ (819.470.035) 3294

39 4:08 0.00 1...Ne7 2.Nb3 Kc7 3.Na5 bxa5 4.Qxa5+ Kd7
5.Qb5+ Kd8 6.Qa5+ Ke8 7.Qa4+ Kd8
8.Qa5+ (819.470.035) 3294

________________________________________________________________


40 17:18 -0.48-- 1...Kc7 2.Nb3 Bb4 3.Nc5 Bxc5 4.dxc5 Ne7
5.Be3 (3.401.680.873) 3275

39 17:18 0.00 1...Ne7 2.Nb3 Kc7 3.Na5 bxa5 4.Qxa5+ Kd7
5.Qb5+ Kd8 6.Qa5+ Ke8 7.Qa4+ Kd8
8.Qa5+ (3.401.680.873) 3275

_________________________________________________________________


40 21:27 -0.70-- 1...Kc7 2.Nb3 Ne7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ (4.129.693.385) 3207

39 21:27 0.00 1...Ne7 2.Nb3 Kc7 3.Na5 bxa5 4.Qxa5+ Kd7
5.Qb5+ Kd8 6.Qa5+ Ke8 7.Qa4+ Kd8
8.Qa5+ (4.129.693.385) 3207

__________________________________________________________________


40 25:25 -0.67 1...Kc7 2.Nb3 Ne7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ Bb6 14.Qb5 Rc8 (4.842.024.004) 3173

40 25:25 -0.67 1...Ne7 2.Nb3 Kc7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ Bb6 14.Qb5 Rc8 (4.842.024.004) 3173


__________________________________________________________________


41 42:47 -0.57 1...Ne7 2.Nb3 Kc7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ Bb6 14.Qb4 Rd8 (7.914.250.147) 3082

41 42:47 -0.62 1...Kc7 2.Nb3 Ne7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ Bb6 14.Qb4 Rd8 (7.914.250.147) 3082

__________________________________________________________________


42 159:00 -0.76 1...Kc7 2.Nb3 Bb4 3.Nc5 Bxc5 4.dxc5 Ne7
5.Be3 Nc8 6.cxb6+ Nxb6 7.Bc5 Kc6
8.Bb4 Bc2 9.Ra1 Ba4 10.Rb1 Rhc8
11.Ba3 Kc7 12.Bc5 Kd8 13.Qa5 Ke8
14.Ba3 Kd7 (31.262.528.458) 3276

41 159:00 -0.57 1...Ne7 2.Nb3 Kc7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4 8.Rb6 Ng6
9.Rc6+ Bxc6 10.Qxc6+ Kb8 11.Qe8+ Kc7
12.Qxa8 Bxc5 13.Qxa5+ (31.262.528.458) 3276

___________________________________________________________________

42 175:39 -0.76 1...Kc7 2.Nb3 Bb4 3.Nc5 Bxc5 4.dxc5 Ne7
5.Be3 Nc8 6.cxb6+ Nxb6 7.Bc5 Kc6
8.Bb4 Bc2 9.Ra1 Ba4 10.Rb1 Rhc8
11.Ba3 Kc7 12.Bc5 Kd8 13.Qa5 Ke8
14.Ba3 Kd7 (34.496.493.880) 3272

42 175:39 -1.10 1...Ne7 2.Nb3 Kc7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4
8.Rb6 Ng6 9.Rc6+ Bxc6 10.Qxc6+ Kb8
11.Qe8+ Kc7 12.Qxa8 Bxc5 13.Qxa5+ Bb6
14.Qb5 Rc8 (34.496.493.880) 3272

___________________________________________________________________

43 229:44 -0.93 1...Kc7 2.Nb3 Bb4 3.Nc5 Bxc5 4.dxc5 Ne7
5.Be3 d4 6.Bxd4 Nd5 7.a4 Rhc8
8.Qb5 Kb7 9.cxb6 axb6 10.Bxb6 Nc3
11.Qd7+ Kxb6 12.Qd4+ Rc5 13.Qxc3 Rxa4
14.Qd4 Kb5 (45.069.141.921) 3269

43 229:44 -0.98 1...Ne7 2.Nb3 Kc7 3.Nc5 bxc5 4.Qd6+ Kc8
5.dxc5 a5 6.Rd2 d4 7.Rb2 Be4
8.Rb6 Ng6 9.Rc6+ Bxc6 10.Qxc6+ Kb8
11.Qe8+ Kc7 12.Qxa8 Bxc5 13.Qxa5+ Bb6
14.Qb5 Rc8 (45.069.141.921) 3269
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.
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RolandoFurioso
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Location: Frankfurt

Re: Any engine?

Post by RolandoFurioso »

Rd2 is suggested by some engines (engine: Fischerle 0.9.50 64 Bit), and, in fact, doesn't look too bad:

L1: -2175 ♖d1x♝d3 ♟c4x♖d3 ♕a6x♟d3
L2: -2175 ♖d1x♝d3 ♟c4x♖d3 ♕a6x♟d3
L3: -2409 ♖d1x♝d3 ♟c4x♖d3 ♘f3-d2 ♟f7-f5 ♕a6x♟d3
L4: -2245 ♖d1x♝d3 ♟c4x♖d3 ♕a6x♟d3 ♚c6-b7 ♘f3-e1
L5: -2409 ♖d1x♝d3 ♟c4x♖d3 ♘f3-e1 ♟f7-f5 ♗c1-d2 ♝f8-e7
L6: -2409 ♖d1x♝d3 ♟c4x♖d3 ♘f3-e1 ♟f7-f5 ♗c1-d2 ♝f8-e7 ♕a6x♟d3
L7: -2499 ♖d1x♝d3 ♟c4x♖d3 ♙a2-a4 ♟f7-f5 ♘f3-e1 ♚c6-c7 ♕a6x♟d3 ♚c7-b8
L8: -2452 ♘f3-e1 ♝d3-f5 ♗c1-a3 ♝f8-e7 ♕a6-a4 ♚c6-c7 ♖d1-c1 ♝e7-g5 ♖c1-c3
L9: -2284 ♗c1-a3 ♝f8-e7 ♕a6-a4 ♚c6-c7 ♗a3-d6 ♚c7-d8 ♘f3-e1 ♝d3-e2 ♖d1-d2 ♝e2-g4
L10: -2397 ♗c1-a3 ♝f8x♗a3 ♕a6x♝a3 ♚c6-b7 ♘f3-e1 ♝d3-f5 ♕a3-g3 ♜h8-h7 ♕g3-a3 ♜a8-c8
L11: -2195 ♘f3-e1 ♝d3-e4 ♙a2-a4 ♞g8-e7 ♙a4-a5 ♞e7-c8 ♙a5x♟b6 ♞c8x♙b6 ♙f2-f3 ♝e4-f5 ♙g2-g4 ♝f5-b1
L12: -2408 ♖d1x♝d3 ♟c4x♖d3 ♙a2-a4 ♞g8-e7 ♙a4-a5 ♞e7-c8 ♙a5x♟b6 ♞c8x♙b6 ♗c1-d2 ♝f8-e7 ♘f3-e1 ♟f7-f5
L13: -2386 ♙a2-a4 ♞g8-e7 ♙a4-a5 ♞e7-c8 ♙a5x♟b6 ♞c8x♙b6 ♗c1-a3 ♝f8x♗a3 ♕a6x♝a3 ♝d3-e2 ♖d1-b1 ♝e2x♘f3 ♕a3-d6 ♚c6-b7 ♕d6-d7 ♚b7-b8 ♙g2x♝f3
L14: -2410 ♙a2-a4 ♞g8-e7 ♙a4-a5 ♞e7-c8 ♗c1-a3 ♝d3-g6 ♖d1-d2 ♝f8x♗a3 ♙a5x♟b6 ♞c8x♙b6 ♕a6x♝a3 ♟a7-a5 ♕a3-c5 ♚c6-b7 ♕c5-b5
L15: -1850
L15: -1665 ♖d1-d2 ♚c6-c7 ♘f3-e1 ♝d3-f5 ♖d2-b2 ♞g8-e7 ♖b2x♟b6 ♟a7x♖b6 ♕a6x♜a8 ♞e7-c8 ♗c1-d2 ♝f8-e7 ♕a8-a4 ♚c7-b8 ♘e1-f3
L16: -1425
L16: -1501 ♖d1-d2 ♚c6-c7 ♘f3-e1 ♝d3-g6 ♖d2-b2 ♜a8-b8 ♕a6x♟a7 ♜b8-b7 ♕a7-a4 ♞g8-e7 ♘e1-f3 ♞e7-c6 ♗c1-d2 ♜b7-b8 ♙g2-g3 ♝f8-e7
L17: -1303 ♖d1-d2 ♞g8-e7 ♖d2-b2 ♚c6-c7 ♖b2x♟b6 ♟a7x♖b6 ♕a6x♜a8 ♞e7-c8 ♘f3-e1 ♝d3-e4 ♗c1-a3 ♝f8x♗a3 ♕a8x♝a3 ♚c7-b8 ♙f2-f4 ♟f7-f6 ♔g1-f2 ♞c8-a7
L18: -1610 ♖d1-d2 ♚c6-c7 ♘f3-e1 ♝d3-f5 ♖d2-b2 ♜a8-b8 ♕a6x♟a7 ♜b8-b7 ♕a7-a8 ♞g8-e7 ♘e1-f3 ♞e7-c8 ♕a8-a4 ♚c7-b8 ♕a4-e8 ♟c4-c3 ♖b2-e2 ♜b7-c7
L19: -1486 ♖d1-d2 ♚c6-c7 ♘f3-e1 ♝d3-e4 ♖d2-b2 ♜a8-b8 ♕a6x♟a7 ♜b8-b7 ♕a7-a4 ♞g8-e7 ♙f2-f3 ♝e4-g6 ♗c1-d2 ♞e7-c6 ♗d2-c3 ♝f8-e7 ♙f3-f4 ♜b7-b8 ♘e1-f3
HV: -1486 ♖d1-d2 ♚c6-c7 ♘f3-e1 ♝d3-e4 ♖d2-b2 ♜a8-b8 ♕a6x♟a7 ♜b8-b7 ♕a7-a4 ♞g8-e7 ♙f2-f3 ♝e4-g6 ♗c1-d2 ♞e7-c6 ♗d2-c3 ♝f8-e7 ♙f3-f4 ♜b7-b8 ♘e1-f3
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