!!! A hard position.!!!

[neelbasant]

Hi all

Here is the position for your engine to test it's ability to understand position.


r1b2k1r/pp2bpp1/4p2p/q1npP3/1n3BQP/2NB1N2/PPP2PP1/1K1R3R w - - 0 15

White to play..

Neel

P.S.: Move is not winning for white but Clearly the best and most chances of win.

[Lyudmil Tsvetkov]

[D]r1b2k1r/pp2bpp1/4p2p/q1npP3/1n3BQP/2NB1N2/PPP2PP1/1K1R3R w - - 0 15

[Lyudmil Tsvetkov]

[D]r1b2k1r/pp2bpp1/4p2p/q1npP3/1n3BQP/2NB1N2/PPP2PP1/1K1R3R w - - 0 15

I am not an engine, and this position is very difficult for me to play correctly without many calculations, but, the first 2 moves that come to mind are, Rh3 (aiming at Rg3), and Bg5.

On Rh3 black has h5, and the queen has to retreat, while white playing h5 himself seems a bit slow. So I think the move is Bg5 (but I would never play the move myself in a quick game, not knowing what happens)

[acase]

Houdini 3 in tactical mode seems to like 1.Bg5 after a little over 3 minutes with a slight edge to white.





21/69+ 03:14 1,222,156,321 6,317,000 +0.30 Bf4-g5
21/69 03:20 1,264,171,826 6,312,000 +0.28 Bf4-g5 h6xg5 h4xg5 Rh8-g8 Bd3-h7 Nc5-e4 Bh7xe4 d5xe4 Qg4xe4 Nb4-d5 Nc3-e2 Qa5-b4 Rd1-d4 Qb4-a5 g5-g6 f7-f5 e5xf6/ep Nd5xf6 Qe4-f4 Qa5-f5 Qf4-d2 e6-e5 Rd4-d8+ Be7xd8 Qd2xd8+ Nf6-e8 Nf3-g5 Qf5xc2+ Kb1-a1 Qc2xg6 Ng5-h7+ Kf8-f7 Qd8-d5+ Kf7-e7 Qd5xg8 Qg6-f7 Qg8xf7+ Ke7xf7 Nh7-g5+ Kf7-g6 Ng5-f3 e5-e4 Nf3-d4 Ne8-f6 Rh1-h8 a7-a5 Ne2-f4+ Kg6-f7
22/69 03:29 1,318,552,883 6,313,000 +0.28 Bf4-g5 h6xg5 h4xg5 Rh8-g8 Bd3-h7 Nc5-e4 Bh7xe4 d5xe4 Qg4xe4 Nb4-d5 Nc3-e2 Qa5-b4 Rd1-d4 Qb4-a5 g5-g6 f7-f5 e5xf6/ep Nd5xf6 Qe4-f4 Qa5-f5 Qf4-d2 e6-e5 Rd4-d8+ Be7xd8 Qd2xd8+ Nf6-e8 Nf3-g5 Qf5xc2+ Kb1-a1 Qc2xg6 Ng5-h7+ Kf8-f7 Qd8-d5+ Kf7-e7 Qd5xg8 Qg6-f7 Qg8xf7+ Ke7xf7 Nh7-g5+ Kf7-g6 Ng5-f3 e5-e4 Nf3-d4 Ne8-f6 Rh1-h8 a7-a5 Ne2-f4+ Kg6-f7
23/69 03:47 1,436,796,923 6,332,000 +0.28 Bf4-g5 h6xg5 h4xg5 Rh8-g8 Bd3-h7 Nc5-e4 Bh7xe4 d5xe4 Qg4xe4 Nb4-d5 Nc3-e2 Qa5-b4 Rd1-d4 Qb4-a5 g5-g6 f7-f5 e5xf6/ep Nd5xf6 Qe4-f4 Qa5-f5 Qf4-d2 e6-e5 Rd4-d8+ Be7xd8 Qd2xd8+ Nf6-e8 Nf3-g5 Qf5xc2+ Kb1-a1 Qc2xg6 Ng5-h7+ Kf8-f7 Qd8-d5+ Kf7-e7 Qd5xg8 Qg6-f7 Qg8xf7+ Ke7xf7 Nh7-g5+ Kf7-g6 Ng5-f3 e5-e4 Nf3-d4 Ne8-f6 Rh1-h8 a7-a5 Ne2-f4+ Kg6-f7
24/69- 04:18 1,635,476,695 6,348,000 +0.20 Bf4-g5 h6xg5
24/73 08:17 3,182,539,136 6,404,000 +0.30 Bf4-g5 h6xg5 h4xg5 Rh8-g8 Bd3-h7 Nc5-e4 Bh7xe4 d5xe4 Qg4xe4 Nb4-d5 Nc3-e2 Kf8-e8 c2-c4 Nd5-b6 Rd1-d4 Be7-c5 Rd4-d2 Qa5-b4 b2-b3 Nb6xc4 Qe4xc4 Qb4xc4 b3xc4 Bc5xf2 Ne2-c3 Bf2-c5 Rh1-d1 Ke8-e7 Nc3-e4 Bc5-b4 Rd2-d3 b7-b6 a2-a3 Bb4-c5 Kb1-b2 Rg8-h8 Ne4xc5 b6xc5
25/73 10:42 4,150,757,970 6,464,000 +0.35 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nb4-c6 Bb5xc6 b7xc6 Qg4-f4 Kd8-e8 Rh1-h8+ Ke8-d7 Qf4xf7 Bc8-b7 Rh8xa8 Bb7xa8 Nf3-d4 Qa5-d8 b2-b4 Qd8-f8 Qf7xf8 Be7xf8 b4xc5 Bf8xc5 Nc3-e2 Bc5-b6 c2-c3 c6-c5 Nd4-b3 Ba8-c6 Kb1-b2 a7-a5 Nb3-d2 a5-a4 Nd2-f3 Bb6-c7 Ne2-f4 d5-d4 Nf4-d3 Bc7-b6 Kb2-c2 Bc6-e4
26/73- 13:23 5,277,123,902 6,571,000 +0.27 Bf4-g5 h6xg5
26/75 17:44 6,991,011,829 6,569,000 +0.33 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nb4-c6 Bb5xc6 b7xc6 Qg4-f4 Kd8-e8 Rh1-h8+ Ke8-d7 Qf4xf7 Bc8-b7 Rh8xa8 Bb7xa8 Nf3-d4 Qa5-d8 b2-b4 Qd8-f8 Qf7xf8 Be7xf8 b4xc5 Bf8xc5 Nc3-e2 Bc5-b6 c2-c3 c6-c5 Nd4-b3 Ba8-c6 Kb1-b2 Kd7-e7 Ne2-f4 Bc6-a4 f2-f3 Ba4-e8 g2-g3 a7-a5 Kb2-c2 a5-a4 Nb3-c1 c5-c4 Nc1-e2
27/75 22:02 8,728,798,998 6,602,000 +0.33 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nb4-c6 Bb5xc6 b7xc6 Qg4-f4 Kd8-e8 Rh1-h8+ Ke8-d7 Qf4xf7 Bc8-b7 Rh8xa8 Bb7xa8 Nf3-d4 Qa5-d8 b2-b4 Qd8-f8 Qf7xf8 Be7xf8 b4xc5 Bf8xc5 Nc3-e2 Bc5-b6 c2-c3 c6-c5 Nd4-b3 Ba8-c6 Kb1-b2 Kd7-e7 Ne2-f4 Bc6-a4 f2-f3 Ba4-e8 g2-g3 a7-a5 Kb2-c2 a5-a4 Nb3-c1 c5-c4 Nc1-e2

[Carlos Ylich]

This seems to come from the advance variation of french, I believe RH3 and Rg3 seems like a good plan.

[zullil]

[D]r1b2k1r/pp2bpp1/4p2p/q1npP3/1n3BQP/2NB1N2/PPP2PP1/1K1R3R w - - 0 15

So I think the move is Bg5 (but I would never play the move myself in a quick game, not knowing what happens)

At the moment, Stockfish also says Bg5, with a score of 0:

Code: Select all

info depth 36 seldepth 57 score cp 0 nodes 5300977790 nps 7993054 time 663198 multipv 1 pv f4g5 h6g5 h4g5 h8h1 d1h1 f8e8 h1h8 e8d7 g4f4 c5d3 f4f7 b4c6 c2d3 a5c5 g5g6 c5f2 a2a3 b7b5 c3b5 c8b7 h8a8 b7a8 b5d6 d7c7 f7g7 f2f1 b1a2 f1d1 g7f7 c6b4 a3b4 d1a4 a2b1 a4d1 b1a2

[acase]

Deep Rybka 4.1 sse42 x64 also likes 1.Bg5.


20+ 06:37 111,425,192 281,015 +0.15 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Nb4-c6 Rh1-h8+ Ke8-d7 a2-a4 Nc5-e4 Nc3xe4
20+ 10:19 165,088,578 266,891 +0.30 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nb4-c6 Bb5xc6 b7xc6 Qg4-f4 Kd8-e8 Rh1-h8+ Ke8-d7 Qf4xf7 Bc8-b7 Rh8xa8 Bb7xa8 Nf3-d4 Qa5-d8 Qf7xg7 Qd8-f8 Qg7xf8 Be7xf8 f2-f4 Nc5-a6 Nd4-f3 Na6-c5 g5-g6
20 13:29 220,403,046 272,457 +0.24 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nc5-e4 Nc3xe4 d5xe4 Nf3-d4 Nb4-d5 c2-c4 Nd5-c3+ b2xc3 Qa5xc3 Rh1-d1 Kd8-c7 Bb5-e8 a7-a6 Qg4xe4 Qc3xa3 Rd1-d3 Qa3-b4+ Kb1-c2 Be7-c5 Nd4-b3 Bc5-e7 Nb3-d2
21 21:39 352,016,818 271,005 +0.34 Bf4-g5 h6xg5 h4xg5 Rh8xh1 Rd1xh1 Kf8-e8 Bd3-b5+ Ke8-d8 a2-a3 Nc5-e4 Nc3xe4 d5xe4 Nf3-d4 Nb4-d5 c2-c4 Nd5-c3+ b2xc3 Qa5xc3 Rh1-d1 Kd8-c7 Bb5-e8 a7-a6 Qg4xe4 Qc3xa3 Rd1-d3 Qa3-b4+ Kb1-c2 Be7-c5 Nd4-b3 Bc5-e7 Nb3-d2

[zullil]

Now a positive score from Stockfish:

Code: Select all

info depth 38 seldepth 86 score cp 60 nodes 15742610063 nps 8338238 time 1888002 multipv 1 pv f4g5 h6g5 h4g5 h8g8 d3h7 c5e4 h7e4 d5e4 g5g6 e4f3 g6f7 f8f7 g4f3 f7e8 f3h5 g7g6 h5h7 e8f8 h1h3 a5e5 h3f3 e5f5 f3f5 g6f5 a2a3 b4d5 c3d5 e6d5 h7h2 e7f6 h2d6 f8g7 d6c7 g7f8 g2g3 g8h8 c2c3 c8e6 c7b7 a8e8 b7a7 h8h2 a3a4 d5d4 c3d4 h2f2 a7c5 f8g7 a4a5 e8c8 c5d6

[zullil]

Code: Select all

info depth 40 seldepth 86 score cp 58 nodes 29811279290 nps 8435016 time 3534229 multipv 1 pv f4g5 h6g5 h4g5 h8g8 d3h7 g8h8 h7g6 h8h1 d1h1 f8e8 g6f7 e8d8 f3d4 c5e4 a2a4 e4c3 b2c3 a5a4 c3b4 a4b4 b1c1 b4a5 d4b3 a5a3 c1d1 d8c7 h1h7 e7f8 h7h3 a3a6 h3d3 c8d7 b3d4 f8c5 d4e6 d7e6 g4e6 a6e6 f7e6 c5f2 d3c3 c7b6 e6d5 a8e8 e5e6 f2h4 c3f3 g7g6 f3f7

[Lyudmil Tsvetkov]

Code: Select all

info depth 40 seldepth 86 score cp 58 nodes 29811279290 nps 8435016 time 3534229 multipv 1 pv f4g5 h6g5 h4g5 h8g8 d3h7 g8h8 h7g6 h8h1 d1h1 f8e8 g6f7 e8d8 f3d4 c5e4 a2a4 e4c3 b2c3 a5a4 c3b4 a4b4 b1c1 b4a5 d4b3 a5a3 c1d1 d8c7 h1h7 e7f8 h7h3 a3a6 h3d3 c8d7 b3d4 f8c5 d4e6 d7e6 g4e6 a6e6 f7e6 c5f2 d3c3 c7b6 e6d5 a8e8 e5e6 f2h4 c3f3 g7g6 f3f7

It is interesting how the Stockfish lines change with more time.