Requesting deep analysis of position

[Nordlandia]

My i7-5690X 4.5GHz is give -1.4 eval for black

SF TCEC 12 BMI2 compile is used.

[elcabesa]

is "black to move" the right assumption?

[Nordlandia]

White to move. Look at the right corner.

[peter]

Yet a fen added would be more comfortable, even if your pic is beautiful too.

Will we ever have a forum- option for fens and .pgns again?

[Nordlandia]

Brainfish 14.06.18 evaluates it as -2.5 advantage for black, so big chance black is winning.

1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - - 0 1

[konsolas]

At depth 41, Houdini 6 is currently at -2.04

[Nordlandia]

+2 is winning most of the times, unless fortress.

With 6-men syzygy consulting

[Eelco de Groot]

Brainfish 14.06.18 evaluates it as -2.5 advantage for black, so big chance black is winning.

1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - - 0 1

Find it hard to bellieve that Black could win this He has no pawns.

Currently -2.32 though...


1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - -

Engine: Kaissa III (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G.

22/23 0:02 -1.03 1.Ra8 Bb3 2.g4 Bf6 3.Ra7+ Kd8 4.Rxa5 Bxb2
5.h4 Bc3 6.Kg2 Be6 7.Rc5 Bxg4 8.Kg3 Be2
9.h5 Ke7 10.a5 Kd6 11.Rc8 Bxh5 12.a6 (7.033.065) 2837
.
.
.
38/26 8:39 -1.99 1.Rb7+ Kc6 2.Rg7 Bb3 3.Kf1 Kc5 4.Ra7 Bxa4
5.Ra8 Bb6 6.Ke1 Kc4 7.Kd2 Kb3 8.Ra6 Bd8
9.Kc1 Bb5 10.Ra8 Bc7 11.Ra7 Bf4+
12.Kd1 a4 13.Ra5 (1.483.987.754) 2857

39/20 8:48 -2.06-- 1.Rb7+ Kc6 (1.508.746.373) 2857

39/23 10:57 -1.99++ 1.Rb7+ (1.868.259.944) 2841

39/23 11:33 -2.14-- 1.Rb7+ Kc6 (1.969.149.851) 2838

39/35 13:48 -2.00++ 1.Rb7+ (2.352.181.493) 2838

39/42 15:15 -1.79++ 1.Rb7+ (2.604.512.515) 2843

39/42 15:27 -1.88 1.Rb7+ Kc6 2.Rg7 Bb3 3.Kf1 Kc5 4.Rg3 Bxa4
5.Ke2 Bf6 6.b3 Bxb3 7.Rxb3 Kc4 8.Rf3 Bd4
9.Rf8 a4 10.Ra8 a3 11.h4 Kb3 12.g4 a2
13.g5 a1Q 14.Rxa1 (2.637.403.567) 2844

40/20 15:38 -1.80++ 1.Rb7+ (2.671.495.002) 2845

40/20 15:53 -1.73++ 1.Rb7+ (2.716.181.600) 2847

40/22 16:01 -1.76 1.Rb7+ Kc6 2.Rg7 Bb3 3.Kf1 Kc5 4.Rg3 Bxa4
5.Ke2 Bf6 6.b3 Bxb3 7.Rxb3 Kc4 8.Rf3 Bc3
9.g4 a4 10.g5 a3 11.Rxc3+ Kxc3 12.g6 (2.739.495.140) 2847

41/21 16:02 -1.83-- 1.Rb7+ Kc6 (2.740.492.203) 2848

41/21 16:02 -1.91-- 1.Rb7+ Kc6 (2.740.923.870) 2848

41/21 16:02 -2.02-- 1.Rb7+ Kc6 (2.741.744.436) 2848

41/21 17:39 -2.18-- 1.Rb7+ Kc6 (3.020.570.794) 2850

41/43 30:23 -2.05++ 1.Rb7+ (5.223.101.892) 2864

41/43 30:34 -2.05 1.Rb7+ Kc6 2.Rg7 Bb3 3.Rg3 Bxa4
4.Kf1 Kb5 5.Rd3 Bc7 6.Ke2 Bc2 7.Rd4 a4
8.Kd2 Bb3 9.Kc1 a3 10.bxa3 bxa3
11.Re4 Bd5 12.Re1 Bxg2 13.Kb1 Bd5
14.h4 (5.256.882.462) 2864

42/21 30:44 -2.13-- 1.Rb7+ Kc6 (5.283.077.089) 2864

42/21 34:23 -2.20-- 1.Rb7+ Kc6 (5.915.083.570) 2866

42/22 35:07 -2.32-- 1.Rb7+ Kc6 (6.041.492.004) 2867

[konsolas]

Full PV at depth 42 for Houdini 6:

-2.04/42 1.Kf1 Bc4+ 2.Ke1 Bf6 3.Ra8 Bxb2 4.Rxa5 Bc3+ 5.Kd1 b3 6.Rc5 b2 7.Kc2 Bd3+ 8.Kxc3 b1=Q 9.Rd5+ Kc7 10.Rxd3 Qc1+ 11.Kb3 Qf1 12.Rc3+ Kb6 13.Rg3 Qxf2 14.Kc3 Qg1 15.Kd3 Qxh2 16.Rg6+ Ka5 17.Ke4 Qh5 18.Rg7 Kxa4 19.Kf4 Qc5 20.Rg6 Qc2 21.Rg5 Qf2+ 22.Ke5 Qe2+ 23.Kf6 Kb3 24.g4 Qf3+ 25.Kg6 Qf4 26.Kh5 Qh2+ 27.Kg6 Qg3 28.Kf7 Qf4+ 29.Kg6 Kc4 30.Kh5

[peter]

Brainfish 14.06.18 evaluates it as -2.5 advantage for black, so big chance black is winning.

1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - - 0 1

That's simply a long endgame won by Black.

After Backward of this line

1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - - 0 1

1. Rb7+ Kc6 2. Rg7 Bb3 3. Kf1 Kc5 4. Ra7 Bxa4 5. Ke2 Bc6 6. Kd3 Bxg2 7. b3 Bd5
8. Kc2 Bb6 9. Rg7 Be4+ 10. Kd2 Bd8 11. Rg8 Be7 12. Rc8+ Kd4 13. Rc4+ Ke5 14.
Rc7 Bg5+ 15. Ke2 Bd5 16. Kd3 Kd6 17. Ra7 Bd8 18. h4 Bxb3 19. Ra8 Bxh4 20. Ra6+
Kd7 21. Rxa5 Bxf2 22. Rb5 Be1 23. Ra5 Bg8 24. Ra7+ Kc6 25. Ra8 Bd5 26. Rc8+ Kb5
27. Rb8+ Ka4 28. Re8 Bc3 29. Rc8 Kb3 30. Rc5 Bb7 31. Ra5 Bc8 32. Rg5 Ba6+ 33.
Ke3 Ka4 34. Rg4 Ka5 35. Rg5+ Bb5 36. Rc5 Ka4 37. Rf5 b3 38. Rf4+ Ka3 39. Rg4 b2
40. Rg1 Be8 41. Rf1 Bg6 42. Rd1 Kb3 43. Rf1 Bg7 44. Rg1 Kc3 45. Rxg6 Bd4+ 46.
Ke2 b1=Q 47. Rg3+ Kc4 48. Kf3 Qe1 49. Rh3 Qe3+ 50. Kg4 Qe4+ 51. Kg3 Kd3 52. Rh6
Qe3+ 53. Kg2 Qxh6 54. Kg3 Qg6+ 55. Kf3 Bg1 56. Kf4 Bh2+ 57. Kf3 Qg3# 0-1

I get this output:

1R1b4/3k4/4b3/p7/Pp6/8/1P3PPP/6K1 w - - 0 1

Analysis by Cfish Tactical 080618 64 POPCNT NUMA:

1.Rb7+ Kc6 2.Rg7 Bb3 3.Kf1 Kc5 4.Ra7 Bxa4 5.Ke1 Bc6 6.Kd2 Kc4 7.Ra6 Bb7 8.Ra7 Bxg2 9.Rg7 Bd5 10.Rg4+ Kc5 11.Kc2 Bf6 12.f3 a4 13.Kb1 Bc4 14.Rf4 Be5 15.Rh4 Bd3+ 16.Ka2 Bg6 17.Rg4 Bf7+ 18.Kb1 Bxh2 19.f4 Be6 20.Rg5+ Bd5 21.Rg4 Bf3 22.Rg5+ Kd4 23.Ka1 Bxf4 24.Rf5 Ke4 25.Rf7 Be5 26.Kb1 Bd1 27.Rb7 Bd6 28.Kc1 Bb3 29.Rd7 Kd5 30.Ra7 Kc5
-+ (-3.90) Depth: 39/61 00:05:58 11182MN

"Tactical" option of CFish is switched off, analysis contempt as well.

Because the line is too long to keep an even clearer winning eval and line in hash, one must be confident with what's to be got.
But yet why doubt the black win? There's no way for White to build a fortress, so what?