Endgame testposition

[kiroje]

Endgame position that seems hard

[d] 2n5/2rk3p/R1pb1pp1/1p1p4/1P1P4/1NPB2PP/3K1P2/8 w - - 0 30

Best move is Na5, it seems that Fruit 2.1 & Deep Shredder 10 have problems seeing this in reasonable time.

Going a bit forward Na5, Ne7 we have this position

[d] 8/2rkn2p/R1pb1pp1/Np1p4/1P1P4/2PB2PP/3K1P2/8 w - - 0 31

Fruit & Shredder doesnt see anything in 5 minutes here, but after playing the sac they both get it.

[d] 8/2rkn2p/R1Nb1pp1/1p1p4/1P1P4/2PB2PP/3K1P2/8 b - - 0 31

Analysis by Fruit 2.1:

31...Nxc6 32.Bxb5 f5 33.Kd3 h6 34.c4 dxc4+ 35.Kxc4 Bxb4 36.Kd5 Ke7 37.Bxc6 Rc8 38.f4 Rb8 39.Kc4 Bd6 40.Ra7+ Kf6 41.Kd5 Be7 42.Kc4
µ (-1.12) Depth: 1/4 00:00:00
± (1.30) Depth: 18/37 00:01:11 86099kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rd8 Kc7 38.Rh8 h5 39.b5 Kb7 40.f4 Kc7 41.h4 Kb6 42.Rd8 Bc7 43.Re8
± (1.13) Depth: 18/37 00:01:27 105mN
± (1.26) Depth: 22/41 00:05:24 400mN

Analysis by Deep Shredder 10:

31...Rxc6 32.Bxb5 f5
± (0.73) Depth: 1/2 00:00:00
± (1.12) Depth: 3/6 00:00:00
31...Nxc6 32.Bxb5 h5 33.Kd3 h4 34.gxh4 Bf4 35.c4 Kd6 36.cxd5 Kxd5 37.Bc4+ Kd6 38.d5 Kd7 39.dxc6+ Rxc6 40.Ra7+ Kd6
µ (-0.95) Depth: 3/6 00:00:00
+- (2.37) Depth: 19/39 00:00:20 23487kN
31...Rxc6 32.Bxb5
+- (2.36) Depth: 19/39 00:00:25 29660kN
+- (1.72) Depth: 27/43 00:06:27 446mN

PS This was from a team game I played today - I didnt play Na5 because I wasnt quite sure of the outcome, but after using some time i'm almost sure its the best move in the position.

[Eelco de Groot]

Endgame position that seems hard

2n5/2rk3p/R1pb1pp1/1p1p4/1P1P4/1NPB2PP/3K1P2/8 w - - 0 30

Best move is Na5, it seems that Fruit 2.1 & Deep Shredder 10 have problems seeing this in reasonable time.

PS This was from a team game I played today - I didnt play Na5 because I wasnt quite sure of the outcome, but after using some time i'm almost sure its the best move in the position.

Hello Kim, Toga agrees with you. I takes a while but Toga Checkov 1.4 Beta_2bb does find the sacrifice in the first position:

[d]2n5/2rk3p/R1pb1pp1/1p1p4/1P1P4/1NPB2PP/3K1P2/8 w - -

Engine: Toga Checkov 1.4 Beta_2bb (256 MB, Athlon 2009 MHz)
by Thomas Gaksch and Fabien Letouzey

2/08 0:00 +0.54 1.f4 Ra7 (384)

2/11 0:00 +0.59 1.Na5 Ne7 (726)

3/11 0:00 +0.50 1.Na5 Ne7 2.Ra8 (961)

4/13 0:00 +0.62 1.Na5 f5 2.f4 Be7 (3.812)

5/13 0:00 +0.51 1.Na5 f5 2.Ke3 Ne7 3.Nb3 (8.113)

6/17 0:00 +0.47 1.Na5 Ne7 2.Ra8 Nc8 3.Ke3 Ra7
4.Rxa7+ Nxa7 (26.773)

7/17 0:00 +0.48 1.Na5 Ne7 2.Ke3 Ke6 3.Kf3 f5 4.Nb3 (46.792)

8/19 0:00 +0.45 1.Na5 Ne7 2.Ke3 h6 3.Nb3 Rc8 4.f4 Re8
5.Ra7+ Ke6 (89.608)

9/20 0:00 +0.45 1.Na5 Ne7 2.Ke3 f5 3.f4 Rc8 4.Nb7 Re8
5.Nxd6 Kxd6 (158.276)

10/23 0:00 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 f5 4.Nb3 Rc8
5.h4 Re8 6.Ra7+ Ke6 (277.445)

11/23 0:00 +0.48 1.Na5 Ne7 2.Ke3 Ke6 3.Kf3 Kf7 4.Nb3 h5
5.Nd2 Rc8 6.Ra1 (422.947)

12/27 0:01 +0.47 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Nb3 Rc8
5.Ra1 h4 6.gxh4 Kf7 7.Nd2 (784.201) 740

13/27 0:02 +0.47 1.Na5 Ne7 2.Kc2 h5 3.Kb2 Ke6 4.Nb3 Rc8
5.h4 Kf7 6.Nd2 Rd8 7.Ra1 (1.568.460) 740

14/29 0:05 +0.50 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Nb3 h4
5.gxh4 Kf7 6.Nd2 Rc8 7.Kg4 Rd8 8.Ra1 (3.928.607) 738

15/31 0:07 +0.49 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Kg2 Kd7
5.Nb3 Rc8 6.Nd2 h4 7.Ra7+ Ke6 8.Nf3 hxg3
9.fxg3 (5.793.449) 738

16/31 0:11 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Kg2 Kd7
5.Nb3 Rc8 6.Nd2 h4 7.Ra7+ Ke6 8.Ra1 hxg3
9.fxg3 Rh8 (8.402.391) 747

17/33 0:25 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.h4 Rc8 6.Ra7+ Rc7 7.Ra6 Ke6 8.Nb3 Rc8
9.Ra1 Re8 10.Re1+ Kd7 (19.562.641) 754

18/33 0:34 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.h4 Rc8 6.Ra6 Rc7 7.Nb3 Rc8 8.Ra7+ Ke6
9.Ra1 Re8 10.Re1+ Kf7 (26.108.884) 757

19/38 0:59 +0.46 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.Kg2 Rc8 6.Ra6 Rc7 7.Nb3 Rc8 8.Nd2 h4
9.gxh4 Re8 10.Ra1 Bf4 (45.027.135) 757

20/38 1:30 +0.46 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.Nb3 Rc8 6.Ra7+ Ke6 7.Ra6 Kd7 8.Na5 h4
9.Nb7 Rh8 10.g4 Kc7 11.Nxd6 Kxd6 (69.231.329) 766

21/41 3:17 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.h4 Rc8 6.Ra6 Rc7 7.Kg2 Ke6 8.Ra8 Kf7
9.Kf3 Nc8 10.Ra6 Ne7 11.Nb3 (150.370.213) 761

22/41 4:41 +0.47 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Ra8 Kd7
5.Rf8 Ke6 6.Re8 Kd7 7.Ra8 Ke6 8.Nb3 Kf7
9.Nd2 Rc8 10.Ra1 h4 11.Kg2 hxg3
12.fxg3 (214.408.334) 762

23/46 9:21 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Nb3 Kf7
5.Kg2 Rc8 6.Na5 Rc7 7.h4 Rc8 8.f3 Rc7
9.Kf2 Ke6 10.Nb3 Rc8 11.Ra1 Re8
12.Re1+ Kf7 (424.778.378) 756

24/75 46:05 +1.12 1.Na5 Ra7 2.Rxc6 Rxa5 3.Rxd6+ Nxd6
4.bxa5 Nc4+ 5.Kc2 Kc6 6.h4 Nxa5 7.h5 f5
8.hxg6 hxg6 9.g4 fxg4 10.Bxg6 Kd6
11.Bf5 Nc6 12.Bxg4 b4 13.f4 bxc3
14.Kxc3 (2.101.247.428) 759

best move: Nb3-a5 time: 51:03.093 min n/s: 761.377 CPU 100.0% n/s(1CPU): 761.377 nodes: 2.331.990.000

Good test for the chesscomputers, I'm glad your proposed solution was not 'Razored' by my coding efforts in Toga.
Nice combination!

Eelco

[Eelco de Groot]

Toga II 1.4 Beta5c also finds it, I think it uses different pruning, but not heavier. The optimized Intel compile is faster in nodes per second also of course, so it is not easy to directly make a comparison:


2n5/2rk3p/R1pb1pp1/1p1p4/1P1P4/1NPB2PP/3K1P2/8 w - -

Engine: Toga II 1.4 beta5c bitbases5men (256 MB)
by Thomas Gaksch and Fabien Letouzey

10/19 0:00 +0.49 1.Na5 Ne7 2.Ke3 h5 3.Kf3 h4 4.gxh4 Rc8
5.Nb7 Rh8 6.Nxd6 Kxd6 (155.022)

11/22 0:00 +0.45 1.Na5 Ne7 2.f4 Ke6 3.Nb3 Rc8 4.Ra7 h6
5.Ra1 Kd7 6.Ke3 (281.822)

12/25 0:00 +0.43 1.Na5 Ne7 2.f4 Ke6 3.Ra8 Nc8 4.h4 f5
5.Ra6 Ne7 6.Nb3 Rc8 (534.129)

13/33 0:01 +0.46 1.Na5 Ne7 2.Ke2 f5 3.Ke3 h6 4.f4 Nc8
5.Nb3 Ra7 6.Rxa7+ Nxa7 7.Nd2 Nc8 (1.102.418) 980

14/33 0:02 +0.46 1.Na5 Ne7 2.Ke2 h5 3.Kf3 g5 4.Nb3 Rc8
5.Nd2 Re8 6.Ra7+ Ke6 7.Ra1 f5 8.Re1+ Kf6 (1.938.404) 960

15/33 0:03 +0.43 1.Na5 Ne7 2.Ke2 f5 3.Kf3 h6 4.h4 Ke6
5.Kg2 Kd7 6.Nb3 Rc8 7.h5 gxh5 8.Ra7+ Ke6 (3.424.532) 960

16/33 0:05 +0.44 1.Na5 Ne7 2.Ke2 h6 3.Kf3 Ke6 4.Ra8 Kd7
5.Nb3 f5 6.Kg2 Rc8 7.Ra7+ Ke6 8.Ra1 Re8
9.Re1+ Kf6 (5.393.038) 968

17/33 0:09 +0.41 1.Na5 Ne7 2.Ke2 h6 3.Kf3 h5 4.Kg2 f5
5.f3 Ng8 6.Nxc6 Rxc6 7.Bxb5 Ne7
8.Ra7+ Bc7 9.Bxc6+ Nxc6 (9.033.542) 976

18/38 0:15 +0.41 1.Na5 Ne7 2.Ke2 h5 3.Kf3 g5 4.Kg2 h4
5.Nb3 Rc8 6.Nd2 Re8 7.Nf3 hxg3
8.fxg3 Bc7 9.Ra1 (15.504.216) 986

19/38 0:23 +0.41 1.Na5 Ne7 2.Ke2 h5 3.Kf3 g5 4.Kg2 h4
5.Nb3 Rc8 6.Nd2 hxg3 7.fxg3 Rh8
8.Ra7+ Ke6 9.Ra1 f5 10.Nf3 Kf6 (23.944.855) 996

20/43 0:49 +0.41 1.Na5 Ne7 2.Ke3 h5 3.h4 Ke6 4.f4 Kf7
5.Kf3 Rc8 6.Kf2 Ke6 7.Nb7 Rb8 8.Nxd6 Kxd6
9.Ra1 Re8 10.Kg2 Ke6 (49.553.135) 993

21/43 1:26 +0.43 1.Na5 Ne7 2.Ke3 h5 3.h4 Ke6 4.f4 Kf7
5.Kf3 Rc8 6.Kf2 Rc7 7.Ra8 Kg7 8.Rd8 Nc8
9.f5 Be7 10.Re8 (85.990.980) 996

22/43 2:11 +0.43 1.Na5 Ne7 2.Ke3 h5 3.h4 Ke6 4.f4 Kf7
5.Kf3 Rc8 6.Kf2 Rc7 7.Ra8 Ke6 8.Nb3 Kf7
9.Nd2 Rc8 10.Ra1 Re8 11.Kg2 Nc8 (131.307.570) 995

23/44 5:17 +0.47 1.Na5 Ne7 2.Ke3 h5 3.h4 Ke6 4.f4 Kf7
5.Kf3 Rc8 6.Kf2 Bb8 7.Nb3 Re8 8.Nd2 Kg7
9.Ra8 Kf7 10.Nf3 Bc7 11.Rxe8 Kxe8 (307.029.825) 967

24/96 19:59 +0.49 1.Na5 Ne7 2.Ke3 h5 3.h4 Ke6 4.f4 Kf7
5.Kf3 Rc8 6.Nb3 Re8 7.Nd2 Rg8 8.Nf1 g5
9.Ne3 gxf4 10.gxf4 Ke6 11.Ra1 Rg7
12.Ra8 (1.245.732.895) 1038

25/96 27:06 +0.93 1.Na5 Ne7 2.Nxc6 Rxc6 3.Bxb5 Kc7
4.Bxc6 Nxc6 5.b5 Ne7 6.Kd3 Nc8
7.Rc6+ Kd7 8.c4 dxc4+ 9.Kxc4 Be7
10.Kd5 Bd8 11.Ra6 Bb6 12.f3 Ne7+
13.Kc4 Nc8 14.g4 (1.675.124.209) 1029

26/96 38:11 +1.10 1.Na5 Ne7 2.Nxc6 Rxc6 3.Bxb5 Kc7
4.Bxc6 Nxc6 5.Ke2 Ne7 6.Ra7+ Kb6
7.Ra8 Nf5 8.Kd3 Kb7 9.Rh8 h5 10.Rh7+ Bc7
11.Rf7 Nd6 12.Rxf6 Ne4 13.Rxg6 Nxf2+
14.Ke3 (2.242.427.564) 978

best move: Nb3-a5 time: 45:14.688 min n/s: 945.846 CPU 100.0% n/s(1CPU): 945.846 nodes: 2.567.470.000

[Alessandro Scotti]

Some 4 billion nodes for Hamsters before it gets it!

[kiroje]

23/46 9:21 +0.48 1.Na5 Ne7 2.Ke3 h5 3.Kf3 Ke6 4.Nb3 Kf7
5.Kg2 Rc8 6.Na5 Rc7 7.h4 Rc8 8.f3 Rc7
9.Kf2 Ke6 10.Nb3 Rc8 11.Ra1 Re8
12.Re1+ Kf7 (424.778.378) 756

24/75 46:05 +1.12 1.Na5 Ra7 2.Rxc6 Rxa5 3.Rxd6+ Nxd6
4.bxa5 Nc4+ 5.Kc2 Kc6 6.h4 Nxa5 7.h5 f5
8.hxg6 hxg6 9.g4 fxg4 10.Bxg6 Kd6
11.Bf5 Nc6 12.Bxg4 b4 13.f4 bxc3
14.Kxc3 (2.101.247.428) 759

best move: Nb3-a5 time: 51:03.093 min n/s: 761.377 CPU 100.0% n/s(1CPU): 761.377 nodes: 2.331.990.000

Good test for the chesscomputers, I'm glad your proposed solution was not 'Razored' by my coding efforts in Toga.
Nice combination!

Eelco

Hi Eelco

Thanks for the nice words

Yes it seems that computers have a very hard time cracking this one - I will try to let Deep Shredder 10 have a long think about this one, although I must admit last night I didnt have the patience to wait 30+ minutes to see if it found the solution. I'll give it some more time and see if it solves it and how long it takes.

With regards
Kim

[kiroje]

25/96 27:06 +0.93 1.Na5 Ne7 2.Nxc6 Rxc6 3.Bxb5 Kc7
4.Bxc6 Nxc6 5.b5 Ne7 6.Kd3 Nc8
7.Rc6+ Kd7 8.c4 dxc4+ 9.Kxc4 Be7
10.Kd5 Bd8 11.Ra6 Bb6 12.f3 Ne7+
13.Kc4 Nc8 14.g4 (1.675.124.209) 1029

26/96 38:11 +1.10 1.Na5 Ne7 2.Nxc6 Rxc6 3.Bxb5 Kc7
4.Bxc6 Nxc6 5.Ke2 Ne7 6.Ra7+ Kb6
7.Ra8 Nf5 8.Kd3 Kb7 9.Rh8 h5 10.Rh7+ Bc7
11.Rf7 Nd6 12.Rxf6 Ne4 13.Rxg6 Nxf2+
14.Ke3 (2.242.427.564) 978

best move: Nb3-a5 time: 45:14.688 min n/s: 945.846 CPU 100.0% n/s(1CPU): 945.846 nodes: 2.567.470.000

Yes it seems somewhat faster, and it finds the other "solution" to the sac - could be fun understanding why it chooses Ra7 instead of Nxc6 for black, is there any evaluation changes between the 2 versions ?

With regards
Kim

[kiroje]

Some 4 billion nodes for Hamsters before it gets it!

Well I think its a very hard problem for computers, right now Deep Shredder 10 is running and i will post the time for it.

BTW what does Hamster choose as blacks best move after Nxc6 ?

With Regards
Kim

[kiroje]

Deep Shredder 10 finds it rather quickly, 12 mins, compared to Toga, 45 and 36 mins, (Eelco's posts)

30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 1/2 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.f4 Ne7 35.g4
± (0.79) Depth: 14/14 00:00:00 10kN
30.Nc5+ Ke7 31.f4 Kf7
± (0.82) Depth: 15/31 00:00:07 7890kN
30.Nc5+ Bxc5 31.dxc5
± (0.84) Depth: 16/35 00:00:10 10729kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.Be2 Nc8 34.Bg4+ f5 35.Be2 g5 36.Ke3 h6 37.f4 Ke6 38.h4
± (0.76) Depth: 17/29 00:00:11 12588kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.Bf1 Ne7 35.Bh3+ f5 36.Bg2 h6 37.f4 Ke6 38.Ke3 Ng8 39.Bf1 Nf6 40.Bd3 Ng4+
± (0.76) Depth: 18/30 00:00:15 17786kN
30.Nc5+ Bxc5 31.dxc5 Ra7 32.Rxa7+ Nxa7 33.h4 Nc8 34.Bf1 Ne7 35.Bh3+ f5 36.Ke3 Ke6 37.Bg2 Ng8
± (0.73) Depth: 19/32 00:00:19 22103kN
30.Na5
± (0.74) Depth: 19/32 00:00:31 37168kN
30.Na5 Ne7 31.h4
± (0.74) Depth: 19/32 00:00:34 40360kN
30.Na5 Ne7 31.h4
± (0.74) Depth: 20/31 00:00:35 42089kN
30.Na5 Ne7 31.h4
± (0.74) Depth: 21/33 00:00:42 50979kN
30.Na5 Ne7 31.h4
± (0.74) Depth: 22/38 00:01:04 76864kN
30.Na5 Ne7 31.h4 f5 32.Ke3
± (0.71) Depth: 23/41 00:03:32 241mN
30.Na5 Ra7 31.Rxc6
± (0.95) Depth: 24/44 00:06:21 434mN
30.Na5 Ra7
± (1.20) Depth: 25/43 00:09:47 663mN
30.Na5 Ne7 31.Nxc6 Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.b5 Ne7 35.Kd3 Nc8 36.g4 f5 37.gxf5 gxf5 38.Rc6+ Kd7 39.c4 dxc4+ 40.Kxc4 h5 41.d5
± (1.28) Depth: 25/47 00:11:40 793mN
30.Na5 Ne7 31.Nxc6 Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.b5 Ne7 35.Kd3 Nc8 36.Rc6+ Kd7 37.c4 dxc4+ 38.Kxc4 f5 39.Ra6 Bc7 40.Kd5 Bb6
± (1.30) Depth: 26/47 00:14:06 961mN
30.Na5 Ne7 31.Nxc6 Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.b5 Ne7 35.Kd3 Nc8 36.Rc6+ Kd7 37.c4 dxc4+ 38.Kxc4 f5 39.Ra6 Bc7 40.Kd5 Bb6 41.f4 Ne7+
± (1.29) Depth: 27/44 00:16:42 1134mN
30.Na5 Ne7 31.Nxc6 Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.b5 Ne7 35.Kd3 Nc8 36.Rc6+ Kd7 37.c4 dxc4+ 38.Kxc4 f5 39.Ra6 Bc7 40.Kd5 Bb6 41.g4 Ne7+ 42.Kc4
± (1.28) Depth: 28/51 00:24:36 1659mN

[kiroje]

Movei doesnt get this in 1 hour

[d] 2n5/2rk3p/R1pb1pp1/1p1p4/1P1P4/1NPB2PP/3K1P2/8 w - - 0 1

Analysis by Movei00_8_438:

30.Na5 Ne7 31.h4 Ke6 32.Ra8 h5 33.Re8 Kd7 34.Rf8 Ke6 35.Ra8
² (0.62) Depth: 20 00:39:09 1059mN
30.Na5 Ne7 31.h4 Ke6 32.Ra8 h5 33.Re8 Kd7 34.Rf8 Ke6 35.Ra8 f5
² (0.62) Depth: 21 00:50:44 1367mN

After the Nxc6 Movei gets after approx. 2 minutes

[d] 8/2rkn2p/R1Nb1pp1/1p1p4/1P1P4/2PB2PP/3K1P2/8 b - - 0 1

Analysis by Movei00_8_438:

31...Nxc6
µ (-0.98) Depth: 1 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00 11kN
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3
µ (-1.00) Depth: 6 00:00:00 11kN
31...Nxc6 32.Bxb5 h6 33.Bd3 f5 34.b5 Nd8
µ (-1.06) Depth: 7 00:00:00 19kN
31...Nxc6 32.Bxb5 h6 33.Bd3 f5 34.b5 Nd8
µ (-1.06) Depth: 7 00:00:00 22kN
31...Nxc6 32.Bxb5 h6 33.Bd3 f5 34.b5 Nd8 35.b6 Rb7
µ (-0.85) Depth: 8 00:00:00 48kN
31...Nxc6 32.Bxb5 h6 33.Bd3 f5 34.b5 Nd8 35.b6 Rb7
µ (-0.85) Depth: 8 00:00:00 56kN
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3 f5 35.Rg8 Ne7
µ (-0.88) Depth: 9 00:00:00 88kN
31...Nxc6 32.Bxb5 h6 33.Ra8 Rb7 34.Bd3 f5 35.Rg8 Ne7
µ (-0.88) Depth: 9 00:00:00 101kN
31...Nxc6
³ (-0.58) Depth: 10 00:00:00 198kN
31...Nxc6 32.Bxb5 Rc8 33.Ra7+ Bc7 34.c4 Rb8 35.Ra6 Rxb5 36.cxb5 Nxd4 37.Rxf6
³ (-0.41) Depth: 10 00:00:00 266kN
31...Nxc6 32.Bxb5 Rc8 33.Ra7+ Bc7 34.c4 Rb8 35.Ra6 Rxb5 36.cxb5 Nxd4 37.Rxf6
³ (-0.41) Depth: 10 00:00:00 299kN
31...Nxc6 32.Bxb5 Rc8
³ (-0.41) Depth: 11 00:00:00 319kN
31...Nxc6 32.Bxb5 Rc8
³ (-0.41) Depth: 11 00:00:00 378kN
31...Nxc6 32.Bxb5 Rc8 33.Ba4 f5 34.b5 Nd8 35.Ra7+ Ke6 36.Rxh7 Rc7 37.Rxc7 Bxc7
³ (-0.35) Depth: 12 00:00:01 707kN
31...Nxc6 32.Bxb5 Rc8 33.Ba4 f5 34.b5 Nd8 35.Ra7+ Ke6 36.Rxh7 Rc7 37.Rxc7 Bxc7
³ (-0.35) Depth: 12 00:00:01 821kN
31...Nxc6 32.Bxb5 f5 33.c4 dxc4 34.d5 Bxb4+ 35.Kd1 Bc5 36.dxc6+ Kd6 37.f4 c3 38.Kc2 Bd4
= (-0.13) Depth: 13 00:00:05 2481kN
31...Nxc6 32.Bxb5 f5 33.c4 dxc4 34.d5 Bxb4+ 35.Kd1 Bc5 36.dxc6+ Kd6 37.f4 c3 38.Kc2 Bd4
= (-0.13) Depth: 13 00:00:05 2754kN
31...Nxc6 32.Bxb5 Be7 33.Ba4 f5 34.Bb3 Ra7 35.Rxa7+ Nxa7 36.Bxd5 Nb5 37.f4 Kd6 38.Bf3 Bf6
= (0.14) Depth: 14 00:00:13 6370kN
31...Nxc6 32.Bxb5 Be7 33.Ba4 f5 34.Bb3 Ra7 35.Rxa7+ Nxa7 36.Bxd5 Nb5 37.f4 Kd6 38.Bf3 Bf6
= (0.14) Depth: 14 00:00:15 7006kN
31...Nxc6 32.Bxb5 f5 33.Kc2 Be7 34.c4 dxc4 35.Kc3 Bxb4+ 36.Kxc4 Be1 37.d5 Bxf2 38.dxc6+ Ke6 39.Ra3 h5
= (0.20) Depth: 15 00:00:22 10786kN
31...Nxc6 32.Bxb5 f5 33.Kc2 Be7 34.c4 dxc4 35.Kc3 Bxb4+ 36.Kxc4 Be1 37.d5 Bxf2 38.dxc6+ Ke6 39.Ra3 h5
= (0.20) Depth: 15 00:00:24 11884kN
31...Nxc6
² (0.50) Depth: 16 00:00:53 24653kN
31...Nxc6
± (1.20) Depth: 16 00:01:09 32268kN
31...Nxc6 32.Bxb5 f5 33.Kd3 f4 34.c4 dxc4+ 35.Kxc4 fxg3 36.fxg3 Bxb4 37.Kd5 Ke7 38.Bxc6 Bd6 39.g4 Bf4
± (1.40) Depth: 16 00:01:19 37353kN
31...Rxc6
± (1.39) Depth: 16 00:01:30 43065kN
31...Rxc6
± (1.10) Depth: 16 00:01:37 46669kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.f4 Ne7 36.Rh8 h5 37.Kd3 Kc6 38.h4 Bc7 39.Ra8
± (0.97) Depth: 16 00:01:48 52075kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.f4 Ne7 36.Rh8 h5 37.Kd3 Kc6 38.h4 Bc7 39.Ra8
± (0.97) Depth: 16 00:01:53 54391kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kb5 38.Rd8 Kc6 39.b5+ Kc7 40.Rh8 Kb6
± (0.99) Depth: 17 00:02:13 64398kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kb5 38.Rd8 Kc6 39.b5+ Kc7 40.Rh8 Kb6
± (0.99) Depth: 17 00:02:24 69571kN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kc7 38.Rf6 Kd7 39.b5 f4 40.gxf4 h6
± (1.07) Depth: 18 00:04:06 118mN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kc7 38.Rf6 Kd7 39.b5 f4 40.gxf4 h6
± (1.07) Depth: 18 00:04:25 127mN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kc7 38.Rf6 Kd7
± (1.07) Depth: 19 00:05:31 159mN
31...Rxc6 32.Bxb5 Kc7 33.Bxc6 Nxc6 34.Ra8 f5 35.Kd3 Kb6 36.Rg8 Ne7 37.Rf8 Kc7 38.Rf6 Kd7
± (1.07) Depth: 19 00:06:14 179mN

[kiroje]

I didnt have the patience to wait another hour so i took it from this position which seems somewhat hard, Arasan does it really well here.

[d] 8/2rkn2p/R1pb1pp1/Np1p4/1P1P4/2PB2PP/3K1P2/8 w - - 0 1

Analysis by Arasan 10.1 (SMP):

31.Nb3 Ke6 32.Ke3 Rb7 33.f4
= (0.25) Depth: 5 00:00:00
31.Nb3 Ke6 32.Ke3 Rb7 33.f4 f5
= (0.25) Depth: 6 00:00:00 7kN
31.h4 h5 32.Nb3 Rb7 33.Ke3 Ke6 34.f4
= (0.25) Depth: 7 00:00:00 56kN
31.Ke3 h5 32.Kf3 Ke6 33.Nb3 Rb7
= (0.25) Depth: 8 00:00:00 174kN
31.Ke3 h5 32.Kf3 Ke6 33.Nb3 Rb7 34.h4 g5 35.Ke3
= (0.25) Depth: 9 00:00:00 245kN
31.Ke3 h5 32.Kf3 Ke6 33.Nb3 Rb7 34.Ra2 Kf7 35.h4 g5
= (0.25) Depth: 10 00:00:00 367kN
31.Ke3 h5 32.Kf3 Ke6 33.Nb3 Rb7 34.Ra2 Kf7 35.h4 Ke6 36.Re2+ Kd7
= (0.25) Depth: 11 00:00:00 590kN
31.Ke3 h5 32.g4 hxg4 33.hxg4 f5 34.gxf5 Nxf5+ 35.Kf3 Ne7 36.Nb3 Nf5 37.Na5
= (0.25) Depth: 12 00:00:02 2068kN
31.Ke3 h5 32.g4 hxg4 33.hxg4 f5 34.gxf5 Nxf5+ 35.Kf3 Ne7 36.Nb3 Nf5 37.Na5
= (0.25) Depth: 13 00:00:04 3813kN
31.Ke3 h5 32.g4 hxg4 33.hxg4 f5 34.g5 Rc8 35.Nb7 Rb8 36.Ra7 Ke6 37.Nxd6 Kxd6
= (0.25) Depth: 14 00:00:08 7230kN
31.Nxc6 Nxc6
± (0.75) Depth: 15 00:00:15 13163kN
31.Nxc6 Rxc6 32.Bxb5 f5 33.Kd3
± (1.28) Depth: 15 00:00:18 15794kN
31.Nxc6 Rxc6 32.Bxb5
± (1.28) Depth: 16 00:00:22 19625kN
31.Nxc6 Rxc6 32.Bxb5
± (1.28) Depth: 17 00:00:29 25951kN
31.Nxc6 Rxc6 32.Bxb5
± (1.28) Depth: 18 00:00:47 40662kN
31.Nxc6 Rxc6 32.Bxb5
± (1.28) Depth: 19 00:01:12 62582kN
31.Nxc6 Rxc6 32.Bxb5
± (1.28) Depth: 20 00:03:18 172mN