Only stockfish sees advantage in this position?

[frcha]

Take a look at the following position
[D]6k1/1R6/8/4b1K1/8/4N3/5P2/1b5r b - - 9 62 B


Only stockfish sees significant advantage for black not even houdini sees this.

Any ideas or thoughts?

[Albert Silver]

Take a look at the following position
[D]6k1/1R6/8/4b1K1/8/4N3/5P2/1b5r b - - 9 62 B


Only stockfish sees significant advantage for black not even houdini sees this.

Any ideas or thoughts?

Could it be a bug in Stockfish?

[frcha]

Oh no -- it is NOT a bug. In fact it is from an engine match -- here's the pgn
Stockfish beats Rybka 4.1 - Rybka thinks its almost even but stockfish immediately thinks its advantage for black as early as move 40


[Event "New4superEbattle"]
[Site "match"]
[Date "2012.11.08"]
[Round "5"]
[White "Rybka 4.1 w32"]
[Black "Stockfish-231-32-ja"]
[Result "0-1"]
[WhiteElo "3000"]
[BlackElo "3000"]
[ECO "B08"]
[Opening "Pirc"]
[Time "15:02:45"]
[Variation "Classical, 5.Be2 O-O 6.O-O c6 7.h3"]
[TimeControl "60+3"]
[Termination "adjudication"]
[PlyCount "131"]
[WhiteType "program"]
[BlackType "program"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 O-O 6.O-O c6 7.a4 a5 8.h3 Na6
{(Nb8a6 Bc1e3 d6d5 e4xd5 c6xd5 Nc3b5 Bc8f5 c2c3 Na6c7 Qd1b3 Nc7xb5
Be2xb5 Nf6e4 Rf1d1 Bf5e6 Bb5d3 Qd8c7 Nf3g5 Ne4xg5) -0.60/19 9}
9.Be3
{(Bc1e3 Na6b4 Qd1d2 Rf8e8 Rf1e1 Bc8e6 Nf3g5 Be6d7 Ra1b1 h7h6 Ng5f3
Bd7e6 e4e5 Nf6d7 Be3xh6 Nb4xc2 Re1c1) +0.41/14 9}
9...d5
{(d6d5 e4xd5 Nf6xd5 Nc3xd5 c6xd5 c2c3 Qd8b6 Qd1d2 Bc8f5 Rf1e1 Rf8d8
Nf3e5 Na6c7 h3h4 f7f6 Ne5g4 Ra8c8 h4h5 Nc7e6 h5xg6 h7xg6 Ng4h6+
Bg7xh6) -0.64/21 7}
10.e5
{(e4e5 Nf6d7 Qd1d2 Na6b4 Be3h6 Nd7b6 Bh6xg7 Kg8xg7 Nf3h4 Bc8d7 Rf1e1
Kg7g8 Nh4f3 Bd7f5 Ra1c1) +0.44/14 9}
10...Nd7
{(Nf6d7 Nf3h4 f7f6 f2f4 Nd7b6 b2b3 Bg7h6 Qd1d2 Na6b4 Ra1b1 Bc8d7 Rb1e1
Bd7c8 Be2d1 Qd8c7 Bd1g4 Bc8xg4 h3xg4 Bh6g7 Nh4f3) -0.52/20 5}
11.Qd2
{(Qd1d2 Na6b4 Be3h6 Nd7b6 Bh6xg7 Kg8xg7 b2b3 Bc8f5 Ra1c1 Nb6d7 Nc3d1
c6c5 c2c3 Nb4c6 Nd1e3 Bf5e4 Ne3g4) +0.47/14 5}
11...f6
{(f7f6 e5xf6 e7xf6 b2b3 Nd7b6 Nc3a2 Bc8f5 Nf3h4 Bf5c8 Be3h6 Bg7xh6
Qd2xh6 Rf8e8 Rf1e1 Bc8e6 Be2d3 Qd8c7 Nh4f3 Na6b4 Na2xb4 a5xb4)
-0.56/19 3}
12.exf6
{(e5xf6 Nd7xf6 Ra1c1 Na6b4 Rf1e1 Bc8e6 Be3f4 Be6f5 Bf4g3 Ra8c8 Nf3e5
Nf6e4 Nc3xe4 Bf5xe4 f2f3) +0.57/13 7}
12...exf6
{(e7xf6 Be3h6 Bg7xh6 Qd2xh6 Na6b4 Qh6d2 Rf8e8 Nc3d1 Nb4a6 Rf1e1 Na6c7
Qd2h6 Nc7e6 Be2d3 b7b6 Nd1c3 Bc8a6 Bd3xa6 Ra8xa6 Re1e3 Ra6a7 Ra1e1)
-0.56/20 8}
13.Rfe1
{(Rf1e1 Nd7b6 Be3f4 Rf8e8 Nc3d1 Na6c7 Nd1e3 Nc7e6 Bf4g3 Qd8e7 c2c3
f6f5 Bg3h2 f5f4 Ne3g4 Re8f8 Ng4e5 Bc8d7 Be2d3) +0.39/14 10}
13...Re8
{(Rf8e8 Nc3d1 Nd7f8 c2c3 Qd8b6 Be3f4 Bc8f5 Nf3h4 Bf5d7 Bf4g3 Nf8e6
Nh4f3 c6c5 Nd1e3 Bd7c6 d4xc5 Na6xc5 Ne3xd5 Bc6xd5 Qd2xd5 Qb6xb2)
-0.52/21 5}
14.b3
{(b2b3 Nd7f8 Nc3d1 Bc8f5 Nf3h4 Bf5d7 Nd1b2 Nf8e6 Nb2d3 Qd8c7 Nh4f3
Qc7b6 Ra1b1 Na6b4 Nd3c5 Ne6xc5 d4xc5 Qb6c7 c2c3) +0.31/14 9}
14...Nf8
{(Nd7f8 Nc3a2 Bc8f5 c2c3 Bf5e4 Na2c1 Nf8e6 Nc1d3 Re8e7 Qd2c2 Qd8d6
Nf3d2 Be4f5 Be2g4 Bf5xd3 Bg4xe6+ Qd6xe6 Qc2xd3 Ra8e8 Qd3c2 Qe6d6
Nd2f3) -0.28/19 4}
15.Na2
{(Nc3a2 Bc8f5 Nf3h4 Bf5d7 Na2c1 Nf8e6 Nh4f3 Re8e7 c2c3 Qd8c7 Nc1d3
Ra8e8 Qd2b2 Qc7d6 Ra1d1 Na6c7) +0.29/14 4}
15...Bf5
{(Bc8f5 c2c3 Bf5e4 Na2c1 Nf8e6 Nc1d3 Qd8b6 Qd2c2 Qb6c7 Qc2c1 Qc7b6
Nf3d2 Be4f5 Qc1b2 Bg7f8 Nd3f4 Ne6xf4 Be3xf4 Na6c7 Bf4g3 Nc7e6 Be2g4
Bf5xg4 h3xg4) -0.16/20 3}
16.Nh4
{(Nf3h4 Bf5d7 Na2c1 g6g5 Nh4f3 Bd7f5 Nc1d3 Nf8e6 c2c3 Bf5g6 b3b4 a5xb4
c3xb4 Qd8d6 b4b5 Na6c7 b5b6 Nc7a6 Ra1b1 Bg6e4 Qd2c3) +0.29/15 7}
16...Bd7
{(Bf5d7 c2c3 Nf8e6 Na2c1 Bg7f8 Nc1d3 Ne6g7 g2g4 Qd8b6 Ra1b1 Qb6d8 f2f4
Bf8d6 Be2f3 b7b6 Kg1h1 Qd8c7 Bf3g2 Qc7a7 Kh1g1 Ng7e6 f4f5) -0.16/20 4}
17.Nc1
{(Na2c1 g6g5 Nh4f3 Bd7f5 Nc1d3 Nf8e6 c2c3 Bf5g6 Ra1c1 Qd8e7 Kg1h1
Bg6e4 Qd2b2 Qe7d6 Kh1g1 Re8e7 h3h4 g5g4 Nf3d2 Ra8e8 Nd2xe4 d5xe4)
+0.23/15 17}
17...Ne6
{(Nf8e6 Nh4f3 Bg7f8 c2c3 Ne6g7 Be3h6 Re8e4 Nc1a2 Ng7f5 Bh6xf8 Qd8xf8
c3c4 Na6b4 Na2xb4 Qf8xb4 Qd2xb4 a5xb4 Be2d3 Re4f4 Bd3xf5 Bd7xf5 c4xd5
c6xd5) -0.12/20 6}
18.Nd3
{(Nc1d3 Bg7f8 c2c3 Ne6g7 Qd2c2 Na6c7 Ra1d1 g6g5 Nh4f3 Ng7f5 Be3d2
Nc7e6 Nd3c1 Nf5d6 Be2d3 Re8e7 Nc1e2 Qd8c7 Ne2g3) +0.26/14 12}
18...Bf8
{(Bg7f8 c2c3 Ne6g7 Nh4f3 Ng7f5 Be3f4 b7b6 Nd3b2 Na6c7 Be2d3 Bf8e7
Ra1c1 Ra8a7 Nb2d1 Be7a3 Re1xe8+ Nc7xe8 Rc1a1 Ba3d6 Bf4xd6 Ne8xd6
Nd1e3) -0.16/20 4}
19.c3
{(c2c3 Ne6g7 f2f4 Bf8d6 Be3f2 Qd8b6 Ra1b1 Qb6c7 Be2f3 Ng7f5 g2g4
Nf5xh4 Bf2xh4 Kg8g7 Bh4f2 b7b6 Bf2g3) +0.26/13 8}
19...Ng7
{(Ne6g7 Nh4f3 Ng7f5 Be3f4 b7b6 Nd3b2 Na6c7 Be2d3 Nf5d6 Re1xe8 Nd6xe8
Ra1e1 Nc7e6 Bf4h2 Bf8d6 h3h4 Bd6xh2+ Nf3xh2 Ne8d6 h4h5 f6f5 Nh2f3
Nd6e4 Bd3xe4 f5xe4 Nf3e5 g6xh5) -0.16/20 5}
20.Qc1
{(Qd2c1 Bf8d6 Nh4f3 Ng7f5 Be3f4 Na6c7 c3c4 Bd6xf4 Nd3xf4 g6g5 Nf4h5
Nc7e6 Qc1d2 Ne6g7) +0.22/12 5}
20...b6
{(b7b6 g2g4 Bf8d6 f2f4 Ra8a7 Qc1d2 Bd7c8 Be3f2 Ng7e6 Be2f3 Na6c7 c3c4
g6g5 Nh4g2 g5xf4 h3h4 Bc8a6 Ng2xf4 Ne6xf4 Re1xe8+ Qd8xe8 Nd3xf4 d5xc4)
-0.04/19 4}
21.Qc2
{(Qc1c2 Na6c7 g2g4 Bf8d6 Qc2d2 Ng7e6 Nh4f3 Qd8e7 Be2f1 Ra8d8 Qd2c2
Qe7f7 Bf1g2) +0.11/12 6}
21...Bd6
{(Bf8d6 Nh4f3 Qd8c7 Qc2c1 Re8e4 Nf3d2 Re4e7 Nd2f3 Ng7f5 Be3f4 g6g5
Bf4xd6 Nf5xd6 Nd3b2 Bd7f5 Be2d3 Re7xe1+ Qc1xe1 Ra8e8 Qe1d2 Nd6e4
Bd3xe4 Bf5xe4) +0.08/19 5}
22.Nf3
{(Nh4f3 Na6c7 g2g4 h7h5 Nf3d2 h5xg4 h3xg4 Qd8c8 Qc2d1 Ng7e6 Nd2f3 c6c5
Qd1d2 Bd7c6 Qd2b2 Ra8b8) +0.07/12 2}
22...Qc7
{(Qd8c7 Ra1c1 Bd7f5 Qc2a2 Ng7e6 h3h4 Ne6g7 Qa2d2 Bf5e4 Be3f4 Ng7h5
Bf4h6 Be4f5 Rc1b1 Qc7d7 Rb1c1 Na6c7 Nd3f4 Nh5xf4 Bh6xf4) +0.16/19 10}
23.Nb2
{(Nd3b2 Ng7f5 Be3d2 c6c5 g2g4 Nf5g7 Be2d3 Re8xe1+ Ra1xe1 Ng7e6 Nb2d1
c5c4 b3xc4 d5xc4 Bd3f1 Ra8e8) +0.02/10 2}
23...Nf5
{(Ng7f5 Be3d2 c6c5 g2g4 Nf5e7 Kg1h1 f6f5 Nf3e5 c5xd4 Ne5xd7 Qc7xd7
Be2b5 Ne7c6 Re1xe8+ Ra8xe8 Bb5xa6 f5xg4 h3xg4 Qd7xg4 f2f4 d4xc3 Qc2xc3
Bd6c5) +0.32/17 3}
24.Bd2
{(Be3d2 c6c5 g2g4 Nf5g7 Be2xa6 Ra8xa6 Re1xe8+ Bd7xe8 Qc2d3 Qc7b7 c3c4
Be8f7 Ra1e1 Ra6a8 d4xc5 Bd6xc5 Qd3c3 Bc5e7 g4g5) -0.03/13 4}
24...c5
{(c6c5 Be2xa6 Ra8xa6 Re1xe8+ Bd7xe8 Qc2d3 Qc7b7 Ra1e1 Ra6a8 g2g4 Nf5g7
Bd2h6 Be8c6 Qd3d2 Ra8e8 Re1xe8+ Ng7xe8 Qd2e3 Qb7e7 Qe3xe7 Bd6xe7 Nb2d3
g6g5 d4xc5 b6xc5) +0.20/19 3}
25.g4
{(g2g4 Nf5g7 Ra1d1 f6f5 Nf3e5 f5xg4 Ne5xd7 Qc7xd7 Be2xg4 Ng7e6 d4xc5
Na6xc5 Bd2e3 Qd7b7 Nb2d3 Nc5e4 Bg4xe6+) -0.07/12 7}
25...Ng7
{(Nf5g7 Be2d3 c5xd4 Re1xe8+ Ng7xe8 Nf3xd4 Na6c5 Nb2d1 Bd6h2+ Kg1h1
Bh2e5 Nd1e3 Qc7b7 Kh1g1 Ne8d6 f2f3 Ra8e8 Ra1e1 Be5g3) +0.28/17 4}
26.Rad1
{(Ra1d1 f6f5 Nf3e5 f5xg4 Ne5xd7 Qc7xd7 Be2xg4 Qd7f7 Nb2d3 h7h5 Bg4e2
c5xd4 c3xd4 Ra8c8 Qc2b2 Qf7f5 Kg1g2) -0.10/11 2}
26...Ne6
{(Ng7e6 Bd2e3 Bd7c6 Be2d3 Qc7g7 Qc2d2 Qg7d7 Bd3e2 Ra8a7 Nb2d3 Qd7c7
Qd2a2 Bc6b7 Qa2b2 Ra7a8 Rd1c1 c5c4 b3xc4 d5xc4) +0.36/17 3}
27.Be3
{(Bd2e3 Qc7b7 Be2d3 Bd7c6 Bd3b5 Bc6xb5 a4xb5 Na6c7 Qc2d3 Bd6f4 Nb2a4
Bf4xe3) -0.14/9 1}
27...Qb7
{(Qc7b7 Be2d3 Re8e7 Bd3f1 Bd7c6 Bf1d3 Qb7d7 Bd3e2 Na6c7 Qc2d2 Ra8e8
Rd1b1 g6g5 Nb2d3 c5c4 b3xc4 d5xc4) +0.48/17 7}
28.Qd2
{(Qc2d2 Na6c7 Be2f1 Ra8c8 Kg1g2 Bd7c6 Kg2g1 b6b5 d4xc5 Ne6xc5 Be3xc5
Bd6xc5 Nb2d3) -0.26/10 2}
28...Bc6
{(Bd7c6 Be2b5 Ra8d8 Bb5xc6 Qb7xc6 Qd2c2 Na6c7 Rd1a1 Kg8h8 Kg1h1 c5c4
Kh1g1 Ne6f4 Be3xf4 Bd6xf4 Re1xe8+ Rd8xe8 b3xc4 d5xc4) +0.52/17 4}
29.Nc4
{(Nb2c4 Bd6e7 Nc4b2 Na6c7 Rd1b1 Be7d6 Kg1g2 c5xd4 Nf3xd4 Ne6xd4 Be3xd4
Nc7e6) -0.27/10 1}
29...Bf8
{(Bd6f8 Nc4b2 Ra8c8 Qd2c2 Bf8d6 Be2d3 Rc8b8 Be3h6 Ne6f4 Bh6xf4 Bd6xf4
Bd3b5 Bc6xb5 a4xb5 Na6c7 Nb2d3 Bf4d6 c3c4 c5xd4 Nf3xd4 d5xc4 b3xc4)
+0.48/18 9}
30.Nb2
{(Nc4b2 Na6c7 Rd1c1 Bf8d6 h3h4 Ra8c8 Rc1b1 c5xd4 Nf3xd4 Ne6c5 Nd4xc6
Nc5e4 Qd2d4 Qb7xc6 Rb1c1) -0.33/12 2}
30...Rac8
{(Ra8c8 Qd2c2 Bf8d6 h3h4 c5xd4 Nf3xd4 Ne6xd4 Be3xd4 Na6c5 Be2f3 Qb7c7
Bf3g2 Qc7d7 Bg2f3 Re8e6 Nb2d3 Rc8e8 Bd4e3 Qd7b7) +0.32/18 6}
31.h4
{(h3h4 c5xd4 Nf3xd4 Ne6xd4 Be3xd4 Na6c5 Qd2c2 Re8e6 Nb2d3 Bf8d6 Be2f1
Rc8e8 Re1xe6 Re8xe6 Bf1g2) -0.27/10 3}
31...cxd4
{(c5xd4 Nf3xd4 Ne6xd4 Be3xd4 Na6c5 Bd4xc5 b6xc5 Be2b5 Re8xe1+ Rd1xe1
Rc8b8 g4g5 f6xg5 Qd2xg5 Bc6xb5 a4xb5 Qb7xb5 Qg5xd5+ Kg8h8 c3c4 Qb5xb3
Nb2d3 a5a4 Nd3xc5 Bf8xc5 Qd5xc5 Kh8g8) +0.84/19 3}
32.Nxd4
{(Nf3xd4 Ne6xd4 Be3xd4 Na6c5 Qd2c2 Re8e6 Nb2d3 Bf8d6 Be2f1 Rc8e8
Re1xe6 Re8xe6 Bf1g2) -0.27/10 1}
32...Nxd4
{(Ne6xd4 Be3xd4 Na6c5 Qd2c2 Bf8g7 h4h5 g6xh5 g4xh5 f6f5 Qc2xf5 Nc5xb3
Be2g4 Nb3xd4 c3xd4 b6b5 Qf5g5) +0.60/19 4}
33.Bxd4
{(Be3xd4 Na6c5 Qd2c2 Bf8g7 h4h5 g6xh5 g4xh5 f6f5 Bd4xc5 b6xc5 Nb2d3
Bg7f6 h5h6 c5c4 b3xc4 d5xc4 Nd3c5) -0.41/11 2}
33...Nc5
{(Na6c5 Qd2c2 Bf8g7 Be2f3 Nc5e6 h4h5 g6xh5 g4xh5 Ne6xd4 c3xd4 Re8xe1+
Rd1xe1 Qb7d7 Nb2d1 Bc6b7 Qc2e2 f6f5 Qe2e7 Rc8d8 Qe7xd7 Rd8xd7 Nd1e3
Bg7xd4 Ne3xf5) +0.44/20 3}
34.Qc2
{(Qd2c2 Bf8g7 h4h5 g6xh5 g4xh5 f6f5 Qc2xf5 Nc5xb3 Be2a6 Qb7xa6 Re1xe8+
Bc6xe8 Bd4xg7 Kg8xg7 Qf5e5+ Kg7g8 Qe5xd5+) -0.14/12 4}
34...Qc7
{(Qb7c7 Nb2d3 Bf8d6 Be2f3 Nc5e4 Bf3g2 Bc6d7 f2f3 Ne4xc3 Re1xe8+ Bd7xe8
Rd1e1 Be8d7 Qc2d2 b6b5 a4xb5 Bd7xb5 Bd4xf6 Bd6g3 Re1e6 Qc7f7 Re6b6
d5d4) +0.52/19 9}
35.Bxf6
{(Bd4xf6 Bc6b7 Bf6d4 Nc5e6 Bd4e3 Bf8g7 Be2b5 Re8e7 c3c4 d5d4 Be3c1
Bb7f3) -0.30/10 3}
35...Bd6
{(Bf8d6 h4h5 Nc5e4 Bf6d4 g6xh5 Be2f3 Re8f8 Bf3xe4 Bd6h2+ Kg1f1 d5xe4
Qc2e2 Qc7f4 Bd4e3 Qf4xg4 Qe2xg4+ h5xg4 Be3xb6 g4g3 Rd1d2) +0.92/16 3}
36.h5
{(h4h5 Nc5e4 Bf6d4 g6xh5 g4xh5 Bd6h2+ Kg1g2 Bh2e5 Re1g1 Kg8h8 Be2f3
Be5xd4 Rd1xd4 Re8g8+ Kg2f1 Qc7h2 Rg1xg8+ Rc8xg8 Nb2d3 Ne4d2+ Qc2xd2)
-0.26/10 4}
36...Ne4
{(Nc5e4 Bf6d4 Qc7e7 Nb2c4 Bd6c7 h5xg6 Qe7h4 g6xh7+ Qh4xh7 f2f4 Qh7h4
Be2d3 d5xc4 Bd3xe4 Bc6xe4 Re1xe4 Qh4g3+) +1.49/18 6}
37.Bd4
{(Bf6d4 g6xh5 g4xh5 Bd6h2+ Kg1g2 Bh2e5 Re1g1 Kg8h8 Be2f3 Be5xd4 Rd1xd4
Qc7g7+ Kg2f1 Bc6b5+ a4xb5 Qg7xd4) -0.26/10 2}
37...Qe7
{(Qc7e7 f2f4 Qe7h4 Be2f3 Bd6xf4 h5xg6 h7xg6 Qc2g2 Re8f8 Nb2d3 Bf4d2
Rd1xd2 Ne4xd2 Re1e3 Nd2xf3+ Re3xf3 Rf8xf3 Qg2xf3 Rc8f8 Qf3g2 Rf8f7
Bd4xb6) +1.57/17 3}
38.Nc4
{(Nb2c4 Bd6c7 Nc4e3 Qe7h4 Be2f3 g6xh5 Kg1f1 h5xg4 Bf3xg4 Rc8b8 Bg4f5
b6b5 Rd1b1 b5xa4) -0.25/9 3}
38...Bc7
{(Bd6c7 Kg1g2 d5xc4 h5xg6 h7xg6 f2f3 c4xb3 Be2c4+ Kg8f8 f3xe4 Bc6xe4+
Qc2xe4 Qe7xe4+ Re1xe4 Re8xe4 Rd1f1+ Kf8e8 Bc4xb3 Re4xg4+ Kg2h3 Rg4g3+
Kh3h4 g6g5+ Kh4h5 Ke8d7 Rf1f7+ Kd7d6 Rf7f6+ Kd6e7 Rf6f7+ Ke7d6)
+2.62/16 2}
39.Bd3
{(Be2d3 Qe7h4 Bd3xe4 Qh4xg4+ Kg1f1 Re8xe4 Re1xe4 Qg4h3+ Kf1e1 d5xc4
Re4e3 Qh3xh5 b3xc4 Bc6f3 Rd1d3 Qh5h1+ Ke1d2 Bc7f4 Qc2b3 Rc8b8 Bd4e5
Bf4xe3+ Rd3xe3 Rb8b7 Be5d4 h7h6) -0.56/10 3}
39...Qh4
{(Qe7h4 Bd3xe4 d5xe4 h5xg6 Qh4xg4+ Kg1f1 h7xg6 Re1e3 Qg4h4 Kf1e1 Bc7f4
Bd4xb6 Rc8b8 Bb6xa5 Bf4xe3 Nc4xe3 Re8f8 Ba5b4 Qh4h1+ Ne3f1) +1.69/14 1
}
40.Bxe4
{(Bd3xe4 Qh4xg4+ Kg1f1 Re8xe4 Re1xe4 Qg4h3+ Kf1e1 d5xc4 Re4e3 Qh3xh5
b3xc4 Bc6f3 Rd1d3 Qh5h1+ Ke1d2 Bc7f4 Qc2b3 Rc8b8 Bd4e5 Bf4xe3+ Rd3xe3
Rb8b7 Be5d4 h7h6) -0.56/11 1}
40...Qxg4+
{(Qh4xg4+ Kg1f1 d5xe4 h5xg6 Qg4h5 g6g7 Bc6d7 Re1e3 Bd7g4 Kf1e1 Bc7f4
Ke1d2 Qh5h2 Rd1f1 Bg4h3 Qc2d1 Bh3xf1 Qd1xf1 Bf4xe3+ Nc4xe3 Re8d8 Ne3c4
Rc8c5) +2.66/16 2}
41.Kf1
{(Kg1f1 Re8xe4 Re1xe4 Qg4h3+ Kf1e1 d5xc4 Re4e3 Qh3xh5 b3xc4 Bc6f3
Qc2b3 Bf3xd1 Qb3xd1 Qh5xd1+ Ke1xd1 Kg8f7 Re3f3+ Kf7e7 Kd1c2 h7h5 Kc2d3
Rc8d8 Rf3e3+ Ke7f7 Re3f3+ Kf7e8) -0.45/11 0}
41...dxe4
{(d5xe4 h5xg6 Qg4h5 g6g7 Bc6d7 Re1e3 Bd7g4 Kf1e1 Bc7f4 Ke1d2 Qh5h2
Rd1f1 Bg4h3 Qc2d1 Bh3xf1 Qd1xf1 Bf4xe3+ Nc4xe3 Re8d8 Ne3c4 Rd8xd4+
c3xd4 Qh2f4+ Kd2c2 Kg8xg7 d4d5) +2.54/17 1}
42.hxg6
{(h5xg6 h7xg6 Re1e3 Rc8d8 Kf1e1 b6b5 a4xb5 Bc6xb5 Qc2e2 Qg4g1+ Ke1d2
Qg1g2 Rd1a1 Re8f8 Re3xe4 Rf8xf2) -0.95/10 3}
42...Qh5
{(Qg4h5 Nc4xb6 Rc8b8 b3b4 Qh5h1+ Kf1e2 Qh1f3+ Ke2f1 Qf3h3+ Kf1e2
Qh3f3+) +2.18/17 6}
43.gxh7+
{(g6xh7+ Kg8xh7 Bd4xb6 Bc7xb6 Nc4xb6 Qh5h3+ Kf1e2 Qh3f3+ Ke2f1 Qf3h1+
Kf1e2 Qh1f3+ Ke2f1 Qf3h1+ Kf1e2 Qh1f3+ Ke2f1 Qf3h1+ Kf1e2 Qh1f3+ Ke2f1
Qf3h1+ Kf1e2 Qh1f3+ Ke2f1 Qf3h1+ Kf1e2 Qh1f3+ Ke2f1 Qf3h1+ Kf1e2)
0.00/10 4}
43...Kxh7
{(Kg8xh7 Re1e3 Re8f8 Rd1c1 Bc7f4 Kf1e1 Qh5h1+ Ke1e2 Qh1g2 Ke2e1 Qg2g1+
Ke1e2 Qg1g4+ Ke2e1 Bf4xe3 Nc4xe3 Qg4g1+ Ne3f1 Rf8f3 Rc1d1 Rc8b8 c3c4
Rb8f8 Bd4xb6 Kh7g8) +2.34/12 0}
44.Bxb6
{(Bd4xb6 Bc7xb6 Nc4xb6 Rc8b8 Nb6c4 Re8f8 Rd1d2 Qh5h3+ Kf1e2 Qh3f3+
Ke2f1 Rf8f6 Re1d1 Qf3h3+ Kf1e2 Qh3g4+ Ke2f1 Rb8f8 Rd2e2 Qg4h3+ Kf1e1
Rf6xf2 Rd1d7+ Bc6xd7 Re2xf2 Rf8xf2 Qc2xf2) 0.00/10 4}
44...Rg8
{(Re8g8 Re1xe4 Qh5h1+ Kf1e2 Qh1xe4+ Qc2xe4+ Bc6xe4 Rd1d7+ Rg8g7
Rd7xg7+ Kh7xg7 Bb6xc7 Rc8xc7 Nc4d6 Be4g6 Nd6b5 Rc7c8 Ke2d2 Rc8h8 f2f3
Rh8h3 Kd2e3 Kg7f6 Nb5d4 Bg6e8 Ke3e4 Kf6e7 c3c4 Be8g6+ Ke4d5 Ke7d7)
+3.51/16 3}
45.Rd6
{(Rd1d6 Qh5h1+ Kf1e2 Qh1f3+ Ke2f1 Qf3g2+ Kf1e2 Qg2g4+ Ke2d2 Bc7xd6
Re1h1+ Kh7g7 Nc4xd6 Qg4f4+ Kd2e1 Qf4xd6 Bb6xa5 Kg7f7 Ba5b6 Rg8h8
Rh1xh8 Rc8xh8 Bb6d4 Rh8h1+ Ke1e2 Kf7g6) -2.03/8 2}
45...Bxb6
{(Bc7xb6 Rd6xc6 Qh5h1+ Kf1e2 Qh1f3+ Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2
Rc8xc6 Re1xe4 Rg8g2+ Kc2d1 Kh7g6 Re4e8 Kg6f7 Re8e2 Rg2xe2 Kd1xe2 Bb6c7
Ke2e3 Rc6h6 Ke3d4 Rh6h3) +4.32/18 3}
46.Rxc6
{(Rd6xc6 Qh5h1+ Kf1e2 Qh1f3+ Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rg8g2+
Kc2b1 Rc8xc6 Re1xe4 Rc6f6 Re4e7+ Kh7h6 Re7e1 Kh6g6 Nc4e5+ Kg6f5 Ne5c4
Rf6c6 Re1f1+ Rg2f2 Rf1e1 Bb6c7 Nc4e3+ Kf5g5 c3c4) -3.49/10 2}
46...Qh3+
{(Qh5h3+ Kf1e2 Qh3f3+ Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rc8xc6 Re1xe4
Rg8g2+ Kc2d3 Rg2g3+ Kd3c2 Kh7g6 Re4e8 Kg6f6 Re8h8 Kf6g7 Rh8e8 Bb6c7
Re8e3 Rg3xe3 Nc4xe3 Kg7f6 Kc2d3 Rc6d6+ Kd3e4 Rd6e6+ Ke4d3 Kf6e5 Ne3c4+
Ke5d5) +4.48/20 3}
47.Ke2
{(Kf1e2 Qh3f3+ Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6
Re1xe4 Rc6f6 Re4e7+ Kh7h6 Re7e1 Kh6g6 Nc4e5+ Kg6f5 Ne5c4 Rf6c6 Re1f1+
Rg2f2 Rf1e1 Bb6c7 Nc4e3+ Kf5g5 c3c4) -3.49/9 0}
47...Qf3+
{(Qh3f3+ Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rc8xc6 Re1xe4 Rg8g2+ Kc2d3
Rg2g3+ Kd3c2 Kh7g6 Re4e8 Kg6f6 Re8h8 Kf6g7 Rh8e8 Rg3g2+ Kc2d3 Rc6h6
Re8c8 Rg2g3+ Kd3e4 Kg7f7 Ke4f5 Bb6f2 Nc4e5+ Kf7e7 Rc8c7+ Ke7e8)
+4.56/21 3}
48.Kd2
{(Ke2d2 Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6 Re1xe4 Rc6f6
Re4e1 Kh7g6 Re1c1 Bb6c7 b3b4 Bc7f4 Rc1e1 Rf6c6 Nc4xa5) -3.48/10 0}
48...Qxf2+
{(Qf3xf2+ Kd2d1 Qf2xc2+ Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6 Re1xe4 Bb6d8 Re4e3
Bd8f6 Nc4xa5 Rc6xc3 Re3xc3 Bf6xc3 Na5c4 Kh7g6 Kb1c1 Rg2g3 Kc1d1 Bc3b4
Kd1c2 Kg6f5 a4a5 Kf5e4) +5.29/21 2}
49.Kd1
{(Kd2d1 Qf2xc2+ Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6 Re1xe4 Rc6f6 Re4e1 Kh7g6
Nc4e5+ Kg6g5 Ne5c4 Rf6c6 Re1e8 Kg5f5 Re8f8+ Kf5e6 Rf8e8+ Ke6d7 Re8e1
Bb6c7 Re1d1+ Kd7e7 Rd1e1+ Ke7f6 Nc4e3) -3.54/13 0}
49...Qxc2+
{(Qf2xc2+ Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6 Re1xe4 Bb6d8 Re4e1 Rg2g3 Re1c1
Bd8f6 Nc4xa5 Rc6e6 Na5c4 Bf6xc3 Kb1a2 Re6e2+ Ka2a3 Bc3f6 a4a5 Bf6e7+
Ka3a4 Re2a2+ Ka4b5 Rg3xb3+ Kb5c6 Be7f6 Kc6d5 Kh7g6 Rc1g1+ Kg6f5 Rg1f1+
Kf5g5 Kd5c5 Bf6e7+ Kc5d5 Rb3d3+ Kd5c6) +5.81/21 2}
50.Kxc2
{(Kd1xc2 Rg8g2+ Kc2b1 Rc8xc6 Re1xe4 Rc6f6 Re4e1 Kh7g6 Nc4e5+ Kg6g5
Ne5c4 Rf6c6 Re1e8 Kg5f5 Re8f8+ Kf5e6 Rf8e8+ Ke6d7 Re8e1 Bb6c7 Re1d1+
Kd7e7 Rd1e1+ Ke7f6 Nc4e3) -3.54/13 0}
50...Rg2+
{(Rg8g2+ Kc2d1 Rc8xc6 Re1xe4 Bb6d8 Re4d4 Rc6h6 Rd4d2 Rg2xd2+ Nc4xd2
Kh7g6 Kd1c2 Kg6f5 Nd2c4 Rh6h2+ Kc2d3 Rh2h3+ Kd3c2 Bd8f6 Nc4d6+ Kf5e5
Nd6e8 Bf6e7 Ne8c7 Rh3g3 Kc2d2 Be7g5+ Kd2c2 Ke5d6 Nc7b5+ Kd6c5 Nb5d4
Bg5f6 Nd4b5 Rg3g2+ Kc2d3 Rg2g4 Kd3c2 Rg4g2+) +6.02/22 2}
51.Kb1
{(Kc2b1 Rc8xc6 Re1xe4 Bb6d8 Re4e1 Bd8f6 Re1h1+ Kh7g6 Rh1c1 Rc6c5 Rc1c2
Rg2xc2 Kb1xc2 Rc5h5 b3b4 Rh5h3 Nc4xa5 Rh3xc3+ Kc2b2 Rc3h3+ Kb2a2 Kg6f5
Na5c4 Kf5e4 b4b5 Ke4d4 Nc4d6 Kd4d5 Nd6e8 Bf6e7 Ka2b2) -3.97/15 4}
51...Rxc6
{(Rc8xc6 Re1xe4 Bb6d8 Re4e5 Rc6h6 Re5e1 Bd8f6 Nc4e3 Bf6xc3 Ne3xg2
Bc3xe1 Ng2xe1 Rh6h1 Kb1c2 Rh1xe1 Kc2d2 Re1g1 Kd2d3 Rg1g4 Kd3c3 Kh7g6
Kc3d3 Kg6f5 Kd3c3 Rg4g3+ Kc3c4) +6.38/22 3}
52.Rxe4
{(Re1xe4 Bb6d8 Re4e1 Bd8f6 Re1h1+ Kh7g6 Rh1c1 Rc6c5 Rc1c2 Rg2xc2
Kb1xc2 Rc5h5 b3b4 Rh5h3 Nc4xa5 Rh3xc3+ Kc2b2 Rc3h3+ Kb2a2 Kg6f5 Na5c4
Kf5e4 b4b5 Ke4d4 Nc4d6 Kd4d5 Nd6e8 Bf6e7 Ka2b2) -3.97/15 1}
52...Bd8
{(Bb6d8 Re4e5 Rc6h6 Re5e1 Bd8f6 Nc4e3 Bf6xc3 Ne3xg2 Bc3xe1 Ng2xe1
Rh6h1 Kb1c2 Rh1xe1 Kc2d2 Re1g1 Kd2d3 Rg1g4 Kd3c3 Kh7g6 Kc3d3 Kg6f5
Kd3c3 Rg4g3+ Kc3c4) +6.38/12 0}
53.Re1
{(Re4e1 Bd8f6 Re1h1+ Kh7g6 Rh1c1 Rc6c5 Rc1c2 Rg2xc2 Kb1xc2 Rc5h5 b3b4
Rh5h3 Nc4xa5 Rh3xc3+ Kc2d2 Rc3a3 Na5c6 Ra3xa4 Kd2d3 Ra4a1 Kd3c4 Kg6f5
b4b5 Ra1b1 Nc6b4 Rb1c1+ Kc4d5 Rc1d1+ Kd5c5 Kf5e4) -4.59/15 4}
53...Bf6
{(Bd8f6 Re1e3 Kh7g6 Re3d3 Rc6e6 Rd3e3 Re6xe3 Nc4xe3 Rg2g3 Ne3d5 Bf6xc3
Nd5xc3 Rg3xc3 Kb1b2 Rc3g3 Kb2c2 Kg6f5 Kc2b2 Kf5e4 Kb2c2 Ke4d4 Kc2b2
Rg3g2+ Kb2c1 Kd4c3) +7.11/21 3}
54.Rh1+
{(Re1h1+ Kh7g6 Rh1c1 Rc6c5 Rc1c2 Rg2xc2 Kb1xc2 Rc5h5 b3b4 Rh5h3 Nc4xa5
Rh3xc3+ Kc2b2 Rc3h3+ Kb2a2 Kg6f5 Na5c4 Kf5e4 Nc4b6 Ke4d4 Ka2b2 Bf6e7
b4b5 Kd4c5 Nb6d7+ Kc5b4 b5b6 Kb4xa4 Kb2c1 Rh3c3+ Kc1d2) -4.67/15 5}
54...Kg6
{(Kh7g6 Nc4e3 Rg2g5 Rh1c1 Rc6xc3 Rc1xc3 Bf6xc3 Kb1c2 Bc3f6 Ne3c4
Rg5g2+ Kc2c1 Bf6c3 Kc1d1 Rg2h2 Nc4e3 Bc3b4 Ne3c2 Bb4c5 Nc2e1 Kg6f5
Ne1f3 Rh2f2 Nf3d2 Kf5e6) +7.47/22 2}
55.Rc1
{(Rh1c1 Rc6c5 Rc1c2 Rg2xc2 Kb1xc2 Rc5h5 b3b4 Rh5h3 Nc4xa5 Rh3xc3+
Kc2b2 Rc3h3+ Kb2a2 Kg6f5 Na5c4 Kf5e4 Nc4b6 Ke4d4 Ka2b2 Bf6e7 b4b5
Kd4c5 Nb6d7+ Kc5b4 b5b6 Kb4xa4 Kb2c1 Rh3c3+ Kc1d2 Rc3b3 Kd2c2)
-4.67/14 5}
55...Rc5
{(Rc6c5 Rc1c2 Rg2g3 Rc2c1 Bf6xc3 Nc4d6 Rc5e5 Nd6b5 Bc3b4 Kb1b2 Re5e2+
Rc1c2 Re2xc2+ Kb2xc2 Kg6f5 Nb5d4+ Kf5e4 Nd4b5 Rg3g2+ Kc2b1 Rg2h2 Kb1c1
Bb4d2+ Kc1b1 Bd2f4 Nb5a7 Bf4e5 Na7c6 Rh2b2+ Kb1c1 Rb2xb3 Nc6xa5 Rb3g3)
+8.04/23 1}
56.Rc2
{(Rc1c2 Rg2xc2 Kb1xc2 Rc5h5 b3b4 Rh5h3 Nc4xa5 Rh3xc3+ Kc2b2 Rc3h3+
Kb2a2 Kg6f5 Na5c4 Kf5e4 Nc4b6 Ke4d4 Ka2b2 Bf6e7 b4b5 Kd4c5 Nb6d7+
Kc5b4 b5b6 Kb4xa4 Kb2c1 Rh3c3+ Kc1d2 Rc3b3 Kd2c2 Rb3b5 Kc2c3) -5.83/16
5}
56...Rg3
{(Rg2g3 Kb1b2 Bf6g7 Rc2c1 Rc5h5 Rc1c2 Rg3xc3 Rc2xc3 Rh5h2+ Kb2c1
Bg7xc3 Nc4d6 Bc3b4 Nd6b5 Kg6f5 Kc1b1 Kf5e4 Nb5c7 Bb4c3 Nc7e6 Ke4d5
Ne6c7+ Kd5c5 Kb1c1 Bc3e5 Nc7e6+ Kc5d5 Ne6d8 Rh2b2 Nd8b7 Rb2xb3 Nb7xa5
Rb3b4) +8.48/25 4}
57.Kb2
{(Kb1b2 Kg6g7 Kb2a3 Bf6xc3 Rc2e2 Rg3g1 Re2c2 Rg1a1+ Rc2a2 Ra1xa2+
Ka3xa2 Rc5h5 Ka2b1 Rh5h2 Nc4d6 Kg7g6 Kb1c1 Rh2h3 Kc1c2 Bc3b4 Nd6b5
Kg6f5 Nb5d4+ Kf5e4 Nd4b5 Rh3h2+ Kc2b1) -5.88/15 2}
57...Bg7
{(Bf6g7 Rc2c1 Rc5h5 Rc1c2 Rg3xc3 Rc2xc3 Rh5h2+ Kb2b1 Bg7xc3 Nc4e3
Rh2b2+ Kb1c1 Bc3d4 Ne3c4 Rb2xb3 Kc1d2 Rb3b4 Kd2d3 Bd4c5 Nc4xa5 Kg6f5
Kd3c2 Rb4xa4 Na5b3 Bc5e3 Kc2d3 Ra4a3 Kd3c4 Kf5e4 Kc4b4 Ra3a8 Kb4c4
Ra8b8) +8.52/25 3}
58.Rc1
{(Rc2c1 Rc5h5 Rc1c2 Rg3xc3 Rc2xc3 Rh5h2+ Kb2c1 Bg7xc3 Nc4d6 Rh2h3
Kc1c2 Bc3b4 Nd6b5 Kg6f5 Nb5d4+ Kf5e4 Nd4b5 Rh3h2+ Kc2b1 Rh2g2 Kb1c1
Ke4e3 Nb5c7 Ke3d3 Nc7d5 Bb4a3+) -6.22/14 2}
58...Rh5
{(Rc5h5 Rc1c2 Rh5h3 Kb2c1 Bg7xc3 Rc2e2 Bc3f6 Nc4e5+ Kg6f5 Ne5c4 Bf6g5+
Kc1b2 Rg3xb3+ Kb2a2 Rb3b4 Nc4d6+ Kf5g6 Nd6e4 Rb4xa4+ Ka2b2 Ra4b4+
Kb2c2 Rh3e3 Re2xe3 Bg5xe3 Ne4c3 Be3g5 Nc3a2 Rb4b8 Na2c3 Rb8c8)
+9.37/24 2}
59.Nd6
{(Nc4d6 Rg3xc3 Rc1xc3 Rh5h2+ Kb2b1 Bg7xc3 Kb1c1 Rh2h3 Nd6c4 Bc3b4
Nc4b6 Rh3xb3 Kc1c2 Rb3c3+ Kc2b2 Kg6f5 Kb2b1 Kf5e4 Kb1a2 Rc3a3+ Ka2b2
Ke4d4 Kb2c2 Ra3c3+ Kc2b2 Bb4a3+ Kb2b1 Kd4c5 Nb6d7+ Kc5b4 Nd7b6)
-7.05/14 3}
59...Rh2+
{(Rh5h2+ Kb2b1 Rg3xc3 Rc1xc3 Bg7xc3 Kb1c1 Bc3b4 Nd6c4 Kg6f5 Nc4b6
Kf5e4 Nb6d7 Ke4d3 Nd7e5+ Kd3c3 Kc1d1 Rh2d2+ Kd1e1 Kc3xb3 Ne5f3 Rd2g2+
Ke1f1 Rg2a2 Nf3g1 Ra2xa4 Ng1e2 Ra4a1+ Kf1f2 a5a4 Ne2d4+ Kb3c3 Nd4e2+
Kc3c4 Kf2f3) +11.11/24 2}
60.Kb1
{(Kb2b1 Rg3xc3 Rc1xc3 Bg7xc3 Kb1c1 Rh2h3 Nd6c4 Bc3b4 Nc4b6 Rh3xb3
Kc1c2 Rb3c3+ Kc2b2 Kg6f5 Kb2b1 Kf5e4 Nb6d7 Rc3b3+ Kb1c1 Rb3a3 Kc1c2
Bb4e7 Kc2b2 Ra3xa4 Kb2b3 Ra4b4+) -7.61/16 1}
60...Rxc3
{(Rg3xc3 Rc1xc3 Bg7xc3 Nd6b7 Rh2b2+ Kb1c1 Rb2xb3 Nb7c5 Rb3b4 Nc5d3
Rb4xa4 Kc1c2 Bc3f6 Kc2b3 Ra4d4 Nd3c5 Rd4b4+ Kb3a2 Rb4c4 Nc5d3 Rc4c2+
Ka2b1 Rc2c3 Nd3f2 Rc3b3+ Kb1c1 a5a4 Nf2g4 Rb3b4 Ng4f2 Rb4d4 Nf2h3 a4a3
Kc1b1 Rd4d1+ Kb1c2 a3a2 Nh3f4+ Kg6f5) +12.72/26 2}
61.Rxc3
{(Rc1xc3 Bg7xc3 Kb1c1 Rh2h3 Nd6c4 Bc3b4 Nc4b6 Rh3xb3 Kc1c2 Rb3c3+
Kc2b2 Kg6f5 Kb2b1 Kf5e4 Nb6d7 Rc3b3+ Kb1c1 Rb3a3 Kc1c2 Bb4e7 Nd7b6
Be7c5 Nb6d7 Ke4d4 Kc2b1 Ra3xa4 Kb1b2 Ra4b4+ Kb2a3 Bc5e7 Ka3a2)
-7.61/16 0}
61...Bxc3
{(Bg7xc3 Nd6b7 Rh2b2+ Kb1c1 Rb2xb3 Nb7c5 Rb3b4 Nc5d3 Rb4c4 Kc1b1
Rc4xa4 Kb1c2 Ra4c4 Kc2b3 Rc4c7 Nd3f2) +11.31/12 0}
62.Kc1
{(Kb1c1 Rh2h3 Nd6c4 Bc3b4 Nc4b6 Rh3xb3 Kc1c2 Rb3c3+ Kc2b2 Kg6f5 Kb2a1
Rc3a3+ Ka1b2 Kf5e4 Nb6c4 Ra3xa4 Kb2b3 Ra4a1 Kb3b2 Ra1f1 Kb2b3 Ke4d4
Kb3a4 Kd4c5 Nc4e5 Rf1a1+ Ka4b3 a5a4+ Kb3b2 Ra1a3 Ne5d7+) -8.05/17 4}
62...Bb4
{(Bc3b4 Nd6c4 Kg6f5 Nc4e3+ Kf5e4 Ne3g4 Rh2g2 Ng4f6+ Ke4d3 Nf6d5 Rg2g1+
Kc1b2 Bb4c3+ Nd5xc3 Rg1g2+ Kb2c1 Kd3xc3 Kc1d1 Kc3xb3 Kd1e1 Kb3xa4
Ke1f1 Rg2h2 Kf1g1 Rh2d2 Kg1h1 Ka4b3 Kh1g1 Kb3c4 Kg1f1 Kc4d3 Kf1g1)
+84.33/27 10}
63.Nc4
{(Nd6c4 Rh2h3 Nc4b6 Rh3xb3 Kc1c2 Rb3c3+ Kc2b2 Kg6f5 Kb2a1 Rc3a3+ Ka1b2
Kf5e4 Nb6c4 Ra3xa4 Kb2b3 Ra4a1 Kb3b2 Ra1f1 Kb2b3 Ke4d4 Kb3a4 Kd4c5
Nc4e5 Rf1a1+ Ka4b3 a5a4+ Kb3b2 Ra1a3 Ne5d7+ Kc5b5 Nd7e5) -8.05/16 2}
63...Kf5
{(Kg6f5 Nc4b6 Kf5e4 Nb6d7 Ke4d4 Kc1d1 Rh2d2+ Kd1e1 Kd4e4 Ke1f1 Rd2xd7
Kf1f2 Rd7d3 Kf2g2 Rd3xb3 Kg2g1 Rb3a3 Kg1g2 Ra3xa4 Kg2f2 Ra4a3 Kf2g2
Ra3f3 Kg2h2 Rf3c3 Kh2g2 Rc3f3) +88.55/26 5}
64.Ne3+
{(Nc4e3+ Kf5e4 Ne3g4 Rh2g2 Ng4f6+ Ke4d4 Nf6h5 Kd4c3 Kc1d1 Kc3xb3 Nh5f4
Rg2h2 Nf4g6 Kb3xa4 Ng6h4 Rh2xh4 Kd1e2 Ka4b3 Ke2f2 Rh4h2+ Kf2g3 Rh2d2
Kg3g4 a5a4 Kg4f5 a4a3 Kf5g4 a3a2 Kg4f3 a2a1Q) -19.73/14 1}
64...Ke4
{(Kf5e4 Ne3g4 Rh2g2 Ng4f6+ Ke4d4 Nf6d7 Bb4a3+ Kc1d1 Kd4e3 b3b4 Rg2d2+
Kd1e1 Rd2xd7 Ke1f1 Ke3f3 Kf1g1 Ba3xb4 Kg1h2 Rd7d1 Kh2h3 Rd1h1+)
+M11/24 2}
65.Ng4
{(Ne3g4 Rh2g2 Ng4f6+ Ke4d3 Nf6d5 Rg2c2+ Kc1b1 Bb4c3 b3b4 a5xb4 Nd5f4+
Kd3d2 Nf4e2 b4b3 Ne2xc3 Kd2xc3 a4a5 Rc2h2 a5a6 Rh2h1+) -M10/19 2}
65...Rg2
{(Rh2g2 Ng4f6+ Ke4d4 Nf6d7 Bb4a3+ Kc1d1 Kd4e3 b3b4 Rg2d2+ Kd1e1 Rd2xd7
Ke1f1 Ke3f3 Kf1g1 Ba3xb4 Kg1h2 Rd7d1 Kh2h3 Rd1h1+) +M10/24 3}
66.Nf6+
{0-1 Arena Adjudication}
0-1

[Modern Times]

I tried quite a few engines. So far only Tornado 4.88 sees a biggish advantage for black, although not as large as stockfish

29/39 1:29 -2.57++ 1...Rg1+ 2.Ng4 Bd4 3.f3 Kf8 4.Rd7 Rd1 5.Rb7 Rf1 6.f4 Bc5 7.Ne5 Ke8 8.Rc7 Be3 9.Rc8+ (343.180.834) 3855 TB:1.062

[Karlo Bala]

Take a look at the following position
[D]6k1/1R6/8/4b1K1/8/4N3/5P2/1b5r b - - 9 62 B


Only stockfish sees significant advantage for black not even houdini sees this.

Any ideas or thoughts?

If there is no forced win then this position should be a draw. However, I do not see this position in game you posted.

[yanquis1972]

seeing an advantage is one thing; showing progress is another...stockfish showed essentially none in a fairly brief run --


Analysis by Stockfish 2.3.1 JA 64bit SSE4.2:

62...Kf8 63.f4 Rg1+ 64.Ng4 Bd6 65.f5 Be4 66.Rd7 Be5 67.Rh7 Bd6
-+ (-4.24) Depth: 7/16 00:00:00 23kN
62...Kf8 63.f4 Rg1+ 64.Ng4 Bc3 65.f5 Be4 66.Rb8+ Ke7 67.Kf4 Bd5 68.Ne3 Bd2
-+ (-4.08) Depth: 8/16 00:00:00 36kN
62...Rg1+ 63.Ng4 Bc2 64.f4 Bd4 65.Kh4 Bc3 66.Ne5 Be1+ 67.Kh5 Bd2 68.Nf3 Bd1 69.Rb8+ Kf7
-+ (-4.20) Depth: 9/24 00:00:00 135kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bd4 65.Kf4 Bc5 66.Rd7 Ba4 67.Rd5 Bb6 68.Ne3 Kf7
-+ (-4.16) Depth: 10/24 00:00:00 487kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bd4 65.f3 Kf8 66.Rc7 Bb3 67.Kf4 Be6 68.Ke4 Bb6 69.Rb7 Bc5 70.Ne5 Re1+ 71.Kf4
-+ (-4.20) Depth: 11/24 00:00:00 654kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bd4 65.f3 Kf8 66.Rc7 Bb3 67.Rd7 Bc5 68.Kf5 Bc2+ 69.Kf4 Be7 70.Rd5 Bb3 71.Rd3 Bc4 72.Rd4 Be6 73.Rd2 Bb4
-+ (-4.24) Depth: 12/24 00:00:00 793kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bd4 65.f3 Kf8 66.Rd7 Bc5 67.Kf4 Be7 68.Rd2 Bg6 69.Rd7 Bh4 70.Rb7 Bc2 71.Ke3 Bg5+ 72.Kd4 Rd1+ 73.Ke5
-+ (-4.12) Depth: 13/27 00:00:00 965kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bb2 65.Kf4 Ra1 66.Rb7 Ra4+ 67.Kg5 Ra5+ 68.Kf4 Bg7 69.Rc7 Bd1 70.Rc8+ Kf7 71.Rc7+ Kg6 72.Rc6+ Kh5 73.Nf6+ Kh4 74.Rd6 Be2
-+ (-4.20) Depth: 14/30 00:00:00 1706kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bb2 65.Kf4 Ra1 66.Rb7 Ra4+ 67.Kg5 Ra5+ 68.Kf4 Bg7 69.f3 Bd1 70.Rc7 Bb3 71.Rc6 Bd4 72.Nh6+ Kh7 73.Nf5 Be5+ 74.Ke3
-+ (-4.12) Depth: 15/32 00:00:00 2285kN
62...Rg1+ 63.Ng4 Bc2 64.Re7 Bb2 65.Kf4 Ra1 66.Rb7 Ra4+ 67.Kg5 Ra5+ 68.Kf4 Bg7 69.f3 Bd1 70.Rc7 Bb3 71.Rc6 Bd4 72.Nh6+ Kh7 73.Nf5 Be5+ 74.Ke3
-+ (-4.12) Depth: 16/32 00:00:00 2409kN
62...Rg1+ 63.Ng4 Bd4 64.f3 Kf8 65.Kf4 Re1 66.Rc7 Ke8 67.Rc4 Bb2 68.Rc7 Re7 69.Rc5 Bd4 70.Rc4 Bg7 71.Rc5 Rf7+ 72.Ke3 Re7+ 73.Kf4
-+ (-4.24) Depth: 17/34 00:00:01 7816kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rh1 66.Kg5 Bb6 67.Rc6 Bd8+ 68.Kf4 Ba5 69.Ke5 Bd2 70.Ne3 Rh5+ 71.Kd4 Rh4+ 72.Ke5 Bd3 73.Rc8+ Kf7 74.Rc7+ Kg6
-+ (-4.24) Depth: 18/34 00:00:01 13129kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.f3 Ba3 67.Nf2 Bc1+ 68.Ke5 Rg5+ 69.Kd4 Bb2+ 70.Ke3 Rb5 71.Ne4 Be5 72.Kf2 Ke8
-+ (-4.32 ++) Depth: 19/39 00:00:02 17096kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rh1 66.Kg5 Bb6 67.Rb7 Bd8+ 68.Kf4 Be7 69.Rb8+ Kf7 70.Rb6 Bc5 71.Rc6 Bb4 72.Ne5+ Ke7 73.Ng6+ Kd7 74.Ne5+ Kd8 75.Ra6 Bc3 76.Rb6 Bc2
-+ (-4.28) Depth: 19/43 00:00:02 20720kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rh1 66.Kg5 Bb6 67.Rb7 Bd8+ 68.Kf4 Be7 69.Rb8+ Kf7 70.Rb6 Bc5 71.Rc6 Bd4 72.Rd6 Bc3 73.Rb6 Bc2 74.Ne3 Bb1 75.Ng4
-+ (-4.24) Depth: 20/43 00:00:03 24020kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rd1 66.Rb7 Re1 67.f3 Bc3 68.Kg5 Bd2+ 69.f4 Rf1 70.Rb8+ Ke7 71.Rb7+ Kd6 72.Rb6+ Kc5
-+ (-4.32 ++) Depth: 21/43 00:00:04 33924kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rd1 66.Rb7 Re1 67.Rd7 Bc3 68.Ne3 Ke8 69.Rb7 Bd4 70.Rb5 Rc1 71.Rd5 Bc5 72.Ke5 Kf7 73.Rd7+ Kg6 74.Rd2 Rh1 75.Rd8 Rh5+ 76.Kf4 Ba2
-+ (-4.32) Depth: 21/43 00:00:04 35138kN
62...Rg1+ 63.Ng4 Bd4 64.f3 Kf8 65.Rb4 Bc5 66.Rb5 Bd6 67.Kf6 Bd3 68.Rb6 Be7+ 69.Ke5 Ra1 70.Rb8+ Kf7 71.f4 Ra4 72.Rb7 Re4+ 73.Kd5 Rxf4 74.Ne5+
-+ (-4.24 --) Depth: 22/43 00:00:06 54160kN
62...Rg1+ 63.Ng4 Bd4 64.f3 Kf8 65.Rd7 Bb2 66.Rb7 Bc3 67.Rc7 Be5 68.Rb7 Bd6 69.Rd7 Be7+ 70.Kf4 Ba3 71.Ne3 Ke8 72.Rd5 Bc1 73.Rb5 Ba2 74.Rc5 Re1 75.Rc8+ Kd7 76.Rc3 Be6
-+ (-4.36) Depth: 22/43 00:00:06 55219kN
62...Rg1+ 63.Ng4 Bd4 64.f3 Kf8 65.Rb4 Bc5 66.Rb5 Bd6 67.Kf6 Bd3 68.Rb6 Bf4 69.Ne5
-+ (-4.28 --) Depth: 23/43 00:00:07 63537kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Ke8 66.f3 Re1 67.Kg5 Rd1 68.Kf4 Kd8 69.Rc4 Bb6 70.Ne3 Rh1 71.Ng4 Ke7 72.Rc6 Bd4 73.Rc4 Bb2 74.Rb4 Ba3 75.Rb7+ Ke6 76.Rb6+ Bd6+ 77.Ke3 Ke7 78.Rb7+ Ke6 79.Nf2 Bc5+ 80.Ke2
-+ (-4.32) Depth: 23/45 00:00:09 81562kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Ke8 66.f3 Re1 67.Kg5 Rd1 68.Kf4 Kd8 69.Rc4 Bb6 70.Ne3 Rh1 71.Ng4 Ke7 72.Rc6 Bd4 73.Rc4 Bb2 74.Rb4 Ba3 75.Rb7+ Kd6 76.Ne5 Bc5 77.Rd7+ Ke6
-+ (-4.40 ++) Depth: 24/45 00:00:10 94210kN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rc7 Rd1 66.f3 Re1 67.Rc4 Bb2 68.Rc7 Bd3 69.Rb7 Ba3 70.Rd7 Bc1+ 71.Kg3 Bf5 72.Rb7 Bd2 73.Rb5 Be6 74.Nf6 Rh1 75.Rb8+ Kf7 76.Ne4 Rh3+ 77.Kf2
-+ (-4.44) Depth: 24/45 00:00:11 104mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Ne3 Rc1 66.Rd7 Bc5 67.Rb7 Bd6+ 68.Kf3 Ke8 69.Nc4 Bc5 70.Rb5 Rc3+ 71.Ke2 Bd3+ 72.Kd2 Bd4 73.Nd6+ Kd7 74.Rd5
-+ (-4.36 --) Depth: 25/50 00:00:16 152mN
62...Rg1+ 63.Ng4 Bc2 64.f3 Bd6 65.Rd7 Bb4 66.Kf4 Ba4 67.Nf6+ Kf8 68.Nh7+ Ke8 69.Nf6+ Kf8
-+ (-4.28 --) Depth: 25/50 00:00:17 155mN
62...Rg1+ 63.Ng4 Bd4 64.f3 Kf8 65.Rd7 Bc3 66.Rb7 Rf1 67.Kf4 Ba2 68.Ke4 Rd1 69.Rc7 Ba5 70.Rc5 Bb4 71.Rb5 Bb1+ 72.Ke3 Rd3+ 73.Ke4 Rd8+ 74.Kf4 Bd2+ 75.Kg3 Bd3 76.Rb7 Be1+ 77.Kf4 Rd5 78.Nf6 Bd2+ 79.Kg3 Rg5+ 80.Kf2 Ba6
-+ (-4.40) Depth: 25/51 00:00:30 279mN
62...Rg1+ 63.Ng4 Bd4 64.f3 Bd3 65.Rd7 Be3+ 66.Kf6
-+ (-4.32 --) Depth: 26/51 00:00:31 286mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc3 65.Rb3 Bd2+ 66.Kf6 Ba2 67.Rd3
-+ (-4.24 --) Depth: 26/51 00:00:34 316mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc3 65.Rb3 Ba5 66.Kf6 Bd8+ 67.Ke5 Kf7 68.Rb7+ Kg6 69.Ne3 Bf6+ 70.Kf4 Re1 71.Rb5 Kf7 72.Rb7+ Ke8 73.Nc4 Be7 74.Rb5 Kd7 75.f3 Ba2 76.Re5 Rb1 77.Rd5+ Kc6 78.Re5 Bb4 79.Re4 Bb3
-+ (-4.28) Depth: 26/51 00:00:37 342mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc5 65.Rb5 Be7+ 66.Kf4 Re1 67.Nh6+ Kh7 68.Ng4 Bd6+ 69.Kg5 Kg7 70.Rb7+ Kf8 71.Rd7 Be7+ 72.Kf4 Kf7 73.Ne5+ Ke6
-+ (-4.36 ++) Depth: 27/51 00:00:39 361mN
62...Rg1+ 63.Ng4 Bd4 64.f4 Bc2 65.Kh4 Bc3 66.Rd7 Be4 67.Ne5 Bf5 68.Rd6 Kg7 69.Rc6 Bd2
-+ (-4.44 ++) Depth: 27/51 00:00:41 384mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc5 65.Rb7 Bd4
-+ (-4.20 --) Depth: 27/51 00:00:45 421mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc5 65.Rb5 Be7+ 66.Kf4 Re1 67.Kg3 Bc2 68.Nh6+ Kf8 69.Nf5 Bf6 70.Ne3 Bd3 71.Rd5 Be4 72.Rb5 Rg1+ 73.Kf4 Rb1 74.Rc5 Bd3 75.Nf5 Rb3 76.Rc8+ Kf7 77.Rc7+ Kg6 78.Ne7+ Kh5 79.Rc5+ Kh4 80.Nf5+ Kh3 81.Rc6 Rb4+ 82.Ke3
-+ (-4.32) Depth: 27/51 00:00:50 465mN
62...Rg1+ 63.Ng4 Bd4 64.Rb4 Bc5 65.Rb5 Be7+ 66.Kf4 Re1 67.Kg3 Bc2 68.Nh6+ Kf8 69.Nf5 Bf6 70.Ne3 Bd3 71.Rd5 Be4 72.Rb5 Rg1+ 73.Kf4 Rb1 74.Rc5 Bd3 75.Nf5 Rb4+ 76.Ke3 Bb1 77.Rc8+ Kf7
-+ (-4.40 ++) Depth: 28/51 00:00:53 489mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Rb7 Bg6 73.Nd5 Bh5+ 74.Kg2 Bf7 75.Nf6 Bd4
-+ (-4.40) Depth: 28/51 00:00:57 525mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Kf4 Bc5 71.Rd5 Bb6 72.Ke5 Ke7 73.Rb5 Bc7+ 74.Kd5 Kd7 75.Rb7 Ba2+ 76.Nc4 Re2 77.f3 Rc2
-+ (-4.48 ++) Depth: 29/51 00:01:06 616mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Kf4 Bc5 71.Rd5 Bb6 72.Kf3 Kf7 73.Rb5 Bd4 74.Rd5 Bc3 75.Rb5 Ke6 76.Rb6+ Kd7 77.Rb7+ Kc6 78.Rb8 Bf6 79.Rf8 Be7 80.Rc8+ Kd7 81.Rc4 Ke6 82.Nc2 Rg1 83.Re4+ Kd7
-+ (-4.48) Depth: 29/51 00:01:07 624mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Rb7 Bg6 73.Kf4 Bd6+ 74.Kf3 Ke8 75.Rg7 Bb1 76.Ke2 Be4 77.Rg4 Bc6 78.Rg6 Bb5+ 79.Kd2 Rc6
-+ (-4.48) Depth: 30/51 00:01:13 677mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Rb7 Bg6 73.Kf4 Bd6+ 74.Kf3 Ke8 75.Rg7 Bb1 76.Ke2 Be4 77.Rg4 Bc6 78.Rg6 Bb5+ 79.Kd2 Rc6
-+ (-4.48) Depth: 31/51 00:01:15 697mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Rb7 Re1 73.Rb5 Bd6 74.Rd5 Be7 75.Kf4 Kf7 76.Nf5 Bb4 77.Rb5 Bc3 78.Rb7+ Ke6 79.Re7+ Kf6 80.Rxe1 Bxe1 81.Ne3 Ke6
-+ (-4.48) Depth: 32/51 00:01:36 883mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Bc2 65.Rd7 Rd1 66.Rc7 Rd2 67.Nh6+ Kh8
-+ (-4.40 --) Depth: 33/55 00:01:50 1011mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Kf4 Ke8 73.Rd5 Bb6 74.Kf3 Kf7 75.Rb5 Bc7 76.Nd5 Bd6 77.Rb6 Bc5 78.Rc6
-+ (-4.48) Depth: 33/55 00:02:20 1286mN
62...Rg1+ 63.Ng4 Bd4 64.Kf4 Kf8 65.Rd7 Bc5 66.Ne3 Rc1 67.Rb7 Bd6+ 68.Kf3 Re1 69.Rd7 Be7 70.Nd5 Bc5 71.Ne3 Rc1 72.Kf4 Ke8 73.Rd5 Bb6 74.Kf3 Kf7 75.Rb5
-+ (-4.48) Depth: 34/55 00:02:33 1403mN
62...Rg1+ 63.Ng4 Bd4 64.f3
-+ (-4.40 --) Depth: 35/57 00:03:46 2075mN

although evaluations differed wildly with the few engines i tested, the 'progress' was usually about the same..very slightly upward from the initial evaluation, more or less stagnating after a minute or so..

although all engines favor black to some degree, based on the computer evaluations i would have to guess it is a drawn position and that stockfish swindled its opponent. wonder what an expert opinion would be.

[syzygy]

Only stockfish sees significant advantage for black not even houdini sees this.

My engine gives +3.4 for black.

Any ideas or thoughts?

Lack of endgame knowledge in both Stockfish and my engine.
How is black going to win this without pawns?

As already noted, the pgn you posted is unrelated to this position.

[kbhearn]

Black could hope to win if he can cleanly win the white pawn, as the bishop pair should be sufficient to force a win of the knight if it has no anchor.

Honestly this seems like a very tricky position that you could only answer for sure with a tablebase solution, if building a special 8 man is even practical. It's hard to see quick progress, but as you play through the lines you also notice black has no simple defensive strategy and frequently finds himself almost at the breaking point.

[Eelco de Groot]

Black could hope to win if he can cleanly win the white pawn, as the bishop pair should be sufficient to force a win of the knight if it has no anchor.

Honestly this seems like a very tricky position that you could only answer for sure with a tablebase solution, if building a special 8 man is even practical. It's hard to see quick progress, but as you play through the lines you also notice black has no simple defensive strategy and frequently finds himself almost at the breaking point.

I think that you have the correct answer Kevin! At one point I wasn't even sure anymore myself if this bishop pair would be enough to give mate against a lone King or if this was also a bug... I really should play some actual chess myself again, if I start forgetting this kind of elementary KBBK endgame... Here just a shoot-out at 5 minutes per game with 5 seconds bonus, and only on a slow Athlon, no Gaviota bases for Stockfish or any other bitbases:


[Event "?"]
[Site "?"]
[Date "2012.11.09"]
[Round "?"]
[White "Rainbow Serpent 2.3.1 a.k.a Stockfish Barracuda"]
[Black "Rainbow Serpent 2.3.1 a.k.a Stockfish Barracuda"]
[Result "0-1"]
[SetUp "1"]
[FEN "6k1/1R6/8/4b1K1/8/4N3/5P2/1b5r b - -"]

1... Kf8 {+3.39/19 21s} 2. Ng4 {-3.55/19 17s} Bc3 {+3.55/20
9s} 3. Rb3 {-3.55/20 11s} Bd4 {+3.63/21 15s} 4. Ne3
{-3.51/19 10s} Be5 {+3.63/20 23s} 5. Ng4 {-3.27/15 10s} Bd6
{+4.00/17 10s} 6. Rb7 {-3.79/18 34s} Re1 {+4.08/18 15s}
7. Rd7 {-3.83/18 24s} Be7+ {+4.79/19 19s} 8. Kf4 {-4.97/21
13s} Re4+ {+4.97/22 10s} 9. Kg3 {-4.72/23 19s} Rb4
{+4.72/22 15s} 10. f3 {-4.72/21 33s} Bf5 {+4.84/19 11s}
11. Rd2 {-4.68/20 10s} Be6 {+4.64/23 11s} 12. Ne5 {-4.40/24
31s} Bh4+ {+5.03/24 11s} 13. Kg2 {-5.03/25 29s} Kg7
{+5.15/20 11s} 14. Nc6 {-5.15/24 9s} Rb5 {+5.15/25 15s}
15. Nd4 {-5.15/25 8s} Rg5+ {+5.15/27 11s} 16. Kh1 {-5.15/28
9s} Bd5 {+5.15/28 16s} 17. Rg2 {-5.15/28 8s} Kf6 {+5.23/30
10s} 18. Rxg5 {-5.19/31 7s} Kxg5
{+5.62/32 7s [D]8/8/8/3b2k1/3N3b/5P2/8/7K w - - Shredder Gui with remote access to 6 man tablebases says 19.Kg1, 19.Kh2 or 19.Kg2 is -mate in 26}
19. Kg2 {-6.04/32 14s} Bc4 {+5.64/38 9s} 20. Kg1 {-80.15/40 27s}
Kf4 {+5.64/32 18s} 21. Nc6 {-84.75/33 18s} Bf6 {+84.80/37
31s} 22. Kf2 {-84.80/39 9s} Bb5 {+84.80/38 13s} 23. Nb4
{-84.80/37 10s} Bd4+ {+84.80/36 13s} 24. Kg2 {-84.80/36
10s} Bc4 {+84.80/35 12s} 25. Nc2 {-84.80/34 21s} Bc5
{+84.75/40 9s} 26. Na1 {-84.75/39 18s} Be7 {+84.75/38 12s}
27. Nc2 {-84.75/32 11s} Bh4 {+84.75/35 25s} 28. Kh2
{-84.75/33 5s} Kxf3 {+85.11/30 22s} 29. Nd4+ {-M29/29 5s}
Kf4 {+M29/29 5s} 30. Kg2 {-M28/28 5s} Bd5+ {+M28/28 3s}
31. Kf1 {-M27/28 4s} Ke4 {+M27/28 7s} 32. Nc2 {-M26/29 5s}
Bb3 {+M23/28 6s} 33. Ke2 {-M22/29 5s} Bxc2 {+M14/27 4s}
34. Kd2 {-M11/30 3s} Bd3 {+M11/31 7s} 35. Kc3 {-M10/32 6s}
Be1+ {+M10/32 7s} 36. Kb2 {-M9/33 3s} Kd4 {+M9/33 5s}
37. Kb3 {-M8/35 6s} Bd2 {+M8/35 6s} 38. Ka2 {-M7/37 3s} Kc3
{+M7/39 11s} 39. Ka3 {-M6/48 4s} Kc2 {+M6/54 8s} 40. Ka4
{-M5/74 4s} Bc4 {+M5/87 4s} 41. Ka3 {-M4/100 0s} Bb5
{+M4/100 0s} 42. Ka2 {-M3/100 0s} Bc1 {+M3/100 0s} 43. Ka1
{-M2/100 0s} Bb2+ {+M2/100 0s} 44. Ka2 {-M1/100 0s} Bc4#
{+M1/100 0s} *

[D]8/8/8/8/2b5/8/Kbk5/8 w - - Mate!

[Karlo Bala]

Black could hope to win if he can cleanly win the white pawn, as the bishop pair should be sufficient to force a win of the knight if it has no anchor.

Honestly this seems like a very tricky position that you could only answer for sure with a tablebase solution, if building a special 8 man is even practical. It's hard to see quick progress, but as you play through the lines you also notice black has no simple defensive strategy and frequently finds himself almost at the breaking point.

IMO, the key to defend this position is passive defense, which engine by default do poorly. Pawn should stay on f2, and the knight on e3. White king then moves e2-f3-g2. Black rook should stay on the second rank or f-file, protecting the f2 pawn. When I analyzed position I found that it is easier to break white defense when white push f pawn. First, after every pawn move, 50 moves rule counter are reset, and the second and more important is that black then has the opportunity to attack from behind with all pieces.