test position

[Leto]

Gull 3 finds it in about 10 seconds on my 12 core:

r2q3r/pbpp1kbP/1p2pn2/6B1/1nPP3Q/8/PP1NNP1P/1BKR4 w - - 0 1

Analysis by Gull 3 x64 12:

15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6
+/= (0.47 --) Depth: 7/15 00:00:00 6kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6
+/= (0.39 --) Depth: 7/15 00:00:00 7kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6
= (0.23 --) Depth: 7/16 00:00:00 7kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6 20.Kc2 Bh6
= (0.01) Depth: 7/19 00:00:00 10kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Ke7 18.Bb1 Rh8 19.Ne4
= (0.09 ++) Depth: 8/25 00:00:00 22kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Ke7 18.Bb1 Rh8 19.Ne4 Bxe4 20.Bxe4
= (0.17 ++) Depth: 9/30 00:00:00 58kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Ke7 18.Bb1 Rh8 19.Ne4 Bxe4 20.Bxe4 c6 21.Bg6
+/= (0.33 ++) Depth: 10/23 00:00:01 89kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Ke7 18.Bb1 Rh5 19.Ne4 Bxe4 20.Bxe4 Rc8 21.Bf3 Rh3 22.d5
+/= (0.65 ++) Depth: 11/31 00:00:01 199kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh8 18.Rg1 Qf8 19.Bh4 Ke7 20.Rg6 Qf7 21.Bb1 Rxh4 22.Qxh4 Rh8 23.Qg5
+/- (0.83) Depth: 12/37 00:00:01 1934kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh8 18.Rg1 Qf8 19.d5 Qd6 20.Qf3 exd5 21.Bf4 Qe7 22.Nd4 Ke8 23.Nf5
+/- (0.91 ++) Depth: 13/34 00:00:01 2531kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh8 18.Bb1 Kg8 19.Rg1 Nh5 20.Qe3 Nf6 21.Qg3 Nh5 22.Qd3 Nf6 23.Qg6 Kf8 24.Bf4
+/- (0.99 ++) Depth: 14/38 00:00:01 3974kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh8 18.Bb1 Kg8 19.Rg1 Kf8 20.Nc3 d5 21.cxd5 exd5 22.Bxf6 Qxf6 23.Qxc7 Qf7 24.Qd6+ Kg8 25.Bc2
+/- (1.15 ++) Depth: 15/44 00:00:02 9317kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Bxf6 Qxf4 20.Nxf4 Rxh2 21.Bxg7 Kxg7 22.Ne4 Bxe4 23.Bxe4 Rg8 24.Nd3 Kf6 25.Kd2 Rg3 26.Rf1 Rg4 27.Ke3 a5
+/- (1.06) Depth: 16/52 00:00:06 48848kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Bxf6 Qxf4 20.Nxf4 Rxh2 21.Bxg7 Kxg7 22.Be4 Bxe4 23.Nxe4 Rh4 24.Rg1+ Kf7 25.Ng5+ Kf6 26.Ne2 Rah8 27.Kd2 d5 28.Nf3 Rh1 29.cxd5 Rxg1 30.Nfxg1 Rg8 31.dxe6 Kxe6 32.Ke3 Rg4 33.Nh3
+/- (1.14 ++) Depth: 17/49 00:00:07 63498kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Rh3 19.Ng1 Rh5 20.Ngf3 Ke7 21.Nh4 Kd8 22.Ng6 Qf7 23.h4 Kc8 24.Ne4 Bxe4 25.Bxe4 d5 26.cxd5 exd5 27.Bxd5
+/- (0.98 --) Depth: 18/53 00:00:08 85170kN
15.Rg1 Ke8 16.Bh6 Bxh6 17.Qxh6 Nxa2+ 18.Kd1 Nxh7 19.Bxh7 d6 20.Rg7
+/- (1.22 ++) Depth: 18/53 00:00:10 115MN
15.Rg1 Ke8 16.Bh6 Bxh6 17.Qxh6 Nxa2+ 18.Kd1 Nxh7 19.Bxh7 d6 20.Rg7
+/- (1.38 ++) Depth: 19/46 00:00:13 162MN
15.Rg1 Qf8 16.a3 Na2+ 17.Kd1 Ke7 18.Bxa2 Kd8 19.Bb1 Qf7 20.Qf4 d6 21.Ne4 Bxe4 22.Bxe4 Rb8 23.Bh4 Rf8 24.Bd3 Bh8 25.Rg8 Rxg8 26.hxg8Q+ Qxg8 27.Bxf6+ Bxf6 28.Qxf6+
+- (1.70 ++) Depth: 20/49 00:00:20 293MN
15.Rg1 Qf8 16.a3 Na2+ 17.Kd1 Ke7 18.Bxa2 Kd8 19.Bb1 Qf7 20.Qf4 Rc8 21.Bh4 Rf8 22.Bg6 Qe7 23.Ne4 Bxe4 24.Bxe4 d6 25.Kc2 d5 26.cxd5 exd5 27.Bd3 Bh8 28.Kb1
+- (2.34 ++) Depth: 21/59 00:00:44 745MN

(, 06.09.2014)

[Leto]

Stockfish 5 finds it in about 10 seconds on my 12 core:

r2q3r/pbpp1kbP/1p2pn2/6B1/1nPP3Q/8/PP1NNP1P/1BKR4 w - - 0 1

Analysis by Stockfish 5 64 SSE4.2 12:

15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8
= (0.18) Depth: 7/8 00:00:00 6kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8
= (0.18) Depth: 8/8 00:00:00 7kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1
+/= (0.57) Depth: 9/12 00:00:00 13kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6 20.Kc2 Rh8
= (0.23) Depth: 10/13 00:00:00 25kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qxh7 Nxh7 18.Bxd8 Rxd8 19.Rg1 Nf6 20.Kc2 Rh8
= (0.23) Depth: 11/13 00:00:00 47kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 d5 18.Rg1 Ke8 19.Bb1 Rh3 20.Bh4 Rxh4 21.Qxh4 Qe7
+/- (0.97) Depth: 12/17 00:00:00 279kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Bf8 18.Bb1 Bd6 19.Bxf6 Bxf4 20.Bxd8 Rxh2
+/- (0.96) Depth: 13/21 00:00:00 479kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh3 18.Bb1 Kf8 19.Rg1 c5 20.Bh4 Qe7 21.Ne4 Bxe4 22.Bxe4 d5 23.cxd5 exd5
+/- (1.01) Depth: 14/26 00:00:00 891kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh3 18.Bb1 Kf8 19.Rg1 c5 20.Bh4 Qe7 21.Ne4 Bxe4 22.Bxe4 d5 23.cxd5 exd5
+/- (1.01) Depth: 15/26 00:00:00 916kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Kf8 18.Bb1 Rh8 19.Bg6 Qe7 20.h4 c5 21.Nf3 d6 22.Kb1 Kg8 23.h5 Rd8
+/- (1.32) Depth: 16/26 00:00:00 1600kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Rhh8 19.Ne4 Bxe4 20.Bxe4 Qd6 21.Bxa8 Qxf4+ 22.Bxf4 Rxa8 23.Rg1 Rh8 24.Bxc7 Rc8 25.Be5 Rxc4+ 26.Kd2 Bh6+ 27.Kd3
+/- (0.92) Depth: 17/26 00:00:01 2468kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Rh8 18.Bb1 Qf8
+/- (1.22) Depth: 18/28 00:00:01 4324kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Nc3 d5 23.Rg1+ Kf6 24.cxd5 Bxd5 25.Nxd5+ exd5 26.f4 Rc8+ 27.Kd1 Rh4 28.Rg6+ Ke7
+/- (1.18) Depth: 19/34 00:00:01 7766kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Nc3 Rxf2 23.Be4 Bxe4 24.Ndxe4 Rf4 25.d5 exd5 26.Rxd5
+/- (1.35) Depth: 20/35 00:00:01 13050kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qe3 Rhh8 20.Rg1 Qxh2 21.d5 Kf8 22.Bf4 Qh3 23.Qe5 Qh5 24.Qxc7 Bxd5 25.cxd5 Qxe2 26.Qd6+ Kg8 27.dxe6 dxe6
+/- (1.36) Depth: 21/35 00:00:02 18765kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Nc3 Rf8 23.Be4 Ba6 24.Rg1+ Kh8 25.f3 Rc8 26.d5 Bxc4 27.Nxc4 Rxc4 28.dxe6 dxe6 29.Rg6
+/- (1.30) Depth: 22/35 00:00:03 28045kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Nc3 Rf8 23.Be4 Ba6 24.Rg1+ Kf7 25.Bf3 Rxf2 26.Nce4 Rh2 27.Nxd6+ Ke7 28.N6e4 Bxc4
+/- (1.24 --) Depth: 23/36 00:00:03 31702kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Rg2 23.Rxg2+ Bxg2 24.Nf4 Bb7 25.d5 exd5 26.Nxd5 Bxd5 27.cxd5 Rf8 28.Ne4 Rf5 29.Ba2 Rf4
+/- (1.19) Depth: 23/37 00:00:03 33921kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Rg2 23.Rxg2+ Bxg2 24.f3 Rf8 25.Be4 b5 26.f4 Bxe4 27.Nxe4 bxc4 28.Nxd6
+/- (1.25 ++) Depth: 24/41 00:00:04 37172kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qe7 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Rg2 23.Rxg2+ Bxg2 24.f3 Rf8 25.Be4 b5 26.f4 Bxe4 27.Nxe4 bxc4
+/- (1.31 ++) Depth: 24/41 00:00:04 38486kN
15.a3 Nc6 16.Rg1 Ba6 17.Qf4 d5
+/- (1.41 ++) Depth: 24/41 00:00:04 40658kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Kf8 23.Nc3 Rxf2 24.Be4 Bxe4 25.Ndxe4 Rf4 26.d5 Ke7 27.Rg7+ Rf7 28.Rxf7+ Kxf7 29.Nxd6+ Ke7 30.Nce4 Rf8
+/- (1.34) Depth: 24/41 00:00:04 48489kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Kf8 23.Nc3 Rxf2 24.Nde4 Bxe4 25.Nxe4 Rf4 26.Rh1 Kg8 27.d5 exd5 28.cxd5 Rc8+ 29.Kd2 Rf5
+/- (1.41 ++) Depth: 25/41 00:00:05 52513kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Kf8 23.Nc3 Rxf2 24.Nde4 Bxe4 25.Nxe4 Rf4 26.Rh1 Kg8 27.d5 exd5 28.cxd5 Rc8+ 29.Kd2 Rf5
+/- (1.41) Depth: 25/41 00:00:05 54650kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Kf8 23.Nc3 Rxf2 24.Nde4 Bxe4 25.Nxe4 Rf4 26.Rh1 Kg8 27.d5 exd5 28.cxd5 Rc8+ 29.Kd2 Rf5 30.Bd3
+/- (1.47 ++) Depth: 26/41 00:00:05 60734kN
15.a3 Na2+ 16.Bxa2 Rxh7 17.Qf4 Qf8 18.Bb1 Qd6 19.Qxd6 cxd6 20.Bxf6 Rxh2 21.Bxg7 Kxg7 22.Rg1+ Kf8 23.Nc3 Rxf2 24.Nde4 Bxe4 25.Nxe4
+/- (1.34 --) Depth: 26/41 00:00:06 67434kN
15.Rg1 Ke8 16.Nf4 Qe7 17.Nh5 Nxa2+ 18.Bxa2
+/- (1.53 ++) Depth: 26/42 00:00:10 129MN
15.Rg1 Qf8 16.Nf4 Nxa2+ 17.Kd1 Qb4 18.Bxf6 Bxf6 19.Qh5+ Ke7 20.Ng6+ Kd6 21.Qg4 Qxb2
+- (1.67 ++) Depth: 26/42 00:00:11 139MN
15.Rg1 Qf8 16.Nf4 Ke8 17.Nh5 Nd3+
+- (1.88 ++) Depth: 26/42 00:00:12 153MN
15.Rg1 Qf8 16.Nf4 Nxa2+ 17.Kd1 Qb8 18.Nh5 Nc3+ 19.bxc3 Nxh5 20.Qxh5+ Kf8 21.Bh6 Bxh6
+- (2.19 ++) Depth: 26/42 00:00:14 184MN
15.Rg1 Qf8 16.Nf4 Nxa2+ 17.Kd1 Qe7 18.Nh5 Nc3+ 19.bxc3
+- (2.66 ++) Depth: 26/42 00:00:17 235MN
15.Rg1 b5 16.Bf4 Rxh7 17.Bxh7 Qh8 18.Bg6+ Kg8 19.Qg5 bxc4 20.Qb5 Nxa2+ 21.Kb1 Bc6 22.Qxc4 Nd5 23.Kxa2 Rb8 24.Be4 Nxf4 25.Nxf4 Qxh2 26.Rxg7+ Kxg7 27.Nxe6+ Kh8 28.Bxc6 Qxf2 29.d5 dxe6 30.Qc3+ Kg8 31.dxe6
+- (2.61) Depth: 26/42 00:00:22 307MN
15.Rg1 b5 16.Bf4 Rxh7 17.Bxh7 Qh8 18.Bg6+ Kg8 19.Qg5
+- (2.67 ++) Depth: 27/43 00:00:23 333MN
15.Rg1 b5 16.Bf4 Rxh7 17.Bxh7 Qh8 18.Bg6+ Kg8 19.Qg5 bxc4 20.Qb5 Nxa2+ 21.Kb1 Bc6 22.Qxc4 Nd5 23.Kxa2 Rb8 24.Be4 Nxf4 25.Nxf4 Qxh2
+- (2.74 ++) Depth: 27/43 00:00:25 354MN

(, 06.09.2014)

[Dan Astrachan]

On my quad-core machine, SF5 finds Rg1 in barely a minute and sticks to it. This move is basically "game over" for Black since White gets a crushing advantage:

[d]r2q3r/pbpp1kbP/1p2pn2/6B1/1nPP3Q/8/PP1NNP1P/1BKR4 w - - 0 15

Stockfish_14090421_x64_modern

Code: Select all

26/42+	01:02	 98 233k	1 582k	+1,43	15.Rg1 Nxa2+ 16.Bxa2 Rxh7 17.Qf4 d6 18.Bb1
(...)
37/68	5:47:48	 34 788 655k	1 667k	+5,60	15.Rg1 Qe7 16.Nf4 Nxa2+ 17.Kd1 Qb4 18.Bxf6 Bxf6 19.Qh5+ Ke7 20.Ng6+ Kd6 21.Qg4 Bh1 22.Bxa2 Kc6 23.Rxh1 Kb7 24.Qf3+ c6 25.Qxf6 Rxh7 26.Bb1 Qxb2 27.Nf4 Rhh8 28.Qg7 Ka6 29.Nd3 Qa3 30.Qxd7 Rac8 31.Re1 Rhd8 32.Qg7 Qd6 33.Re4 Rc7 34.Qf6 Kb7 35.Nf4 Rg8 36.c5 Qe7

[pgn]
[FEN "r2q3r/pbpp1kbP/1p2pn2/6B1/1nPP3Q/8/PP1NNP1P/1BKR4 w - - 0 15"]
15.Rg1 Qe7 16.Nf4 Nxa2+ 17.Kd1 Qb4 18.Bxf6 Bxf6 19.Qh5+ Ke7 20.Ng6+ Kd6 21.Qg4 Bh1 22.Bxa2 Kc6 23.Rxh1 Kb7 24.Qf3+ c6 25.Qxf6 Rxh7 26.Bb1 Qxb2 27.Nf4 Rhh8 28.Qg7 Ka6 29.Nd3 Qa3 30.Qxd7 Rac8 31.Re1 Rhd8 32.Qg7 Qd6 33.Re4 Rc7 34.Qf6 Kb7 35.Nf4 Rg8 36.c5 Qe7[/pgn]

[AdminX]

Komodo 8 wasn't able to find it in less than 10 minutes with my 12 core:
r2q3r/pbpp1kbP/1p2pn2/6B1/1nPP3Q/8/PP1NNP1P/1BKR4 w - - 0 1

But Komodo 8 with a quick 10 minute deep position analysis (22 seconds per half-move) with three branches found the move quickly. Unfortunately in engine vs engine matches deep position analysis or even multivariation mode is not possible so K8 would probably miss this move under standard tournament time control.

Interesting, on my quad (i7 - 4800MQ) it finds it pretty fast and sits on it as I watch the score rising.