Nice tactics test find 19. Rf6

[beram]

How long to find best move 19. Rf6 ?
[d] r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1

From a recent Nunn2 match FireBird 1.0 beta w32 - Rybka 3 32-bit,
(Centrino DualCore T8300, 2100 Mhz, 40m/40+20m/40+20m)
You can see difference in time between FB1.0 beta and Rybka 3
Actually in the game FB played this after 1:39 min:sec

Analysis by Rybka 3 32-bit 2CPU (Centrino DualCore T8300, 2100 Mhz)
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Rc5 26.Rf4 a5
= (0.15) Depth: 14 00:00:38 2615kN
19.Rf6
+/= (0.42 !) Depth: 14 00:02:19 8908kN
19.Rf6 Rfc8 20.Rxe6 fxe6[] 21.Qg4[] Qxe5 22.Bd4 h5 23.Qg6 Qxd4 24.Qh7+[] Kf8 25.Qh8+[] Kf7[] 26.Qxh5+[] Kf8[] 27.Bg6 Qxd1+ 28.Qxd1 Bc5 29.Qg4 Ke7 30.Bh5 Rf8 31.Qxg7+ Kd6 32.Bf7 Ke7[]
+/= (0.39) Depth: 14 00:02:24 9301kN

Firebird 1.0 beta 32-bit 2CPU
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Ra7 26.Ref3 a5 27.Rf4 Kg8 28.Rd4 Re7 29.Be2
= (0.16) Depth: 19 00:00:34 49296kN
19.Rf6
= (0.24) Depth: 19 00:01:35 144mN
19.Rf6
+/= (0.32) Depth: 19 00:02:05 188mN

grts Bram

[jdart]

Are you sure this is winning or at least a lot better than other moves? The scores are not very high.

[meschle]

This is a great rook sac! Rybka winfinder finds it in 2 sec

FEN: r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1

Rybka WinFinder v2.2.mp.x64:
4 00:00 12.292 740.412 +0.52 Rf1f3
5 00:00 18.488 573.688 +0.45 Rf1f3
6 00:00 32.768 524.288 +0.30 Rf1f3 Kg8h8
7 00:00 62.600 508.749 +0.37 Rf1f3 Kg8h8 Rf3g3
8 00:00 115.276 502.309 +0.30 Rf1f3 Kg8h8 Rf3g3 a6a5
9 00:00 213.508 516.860 +0.37 Rf1f3 Kg8h8 Rf3g3 Rf8e8 Rd1f1
10 00:01 448.580 498.205 +0.30 Rf1f3 Rf8c8 Rf3g3 Be7c5 Qd4f4 Bc5xe3
11 00:01 735.900 477.845 +0.37 Rf1f3 Rf8c8 Rf3g3 Be7c5 Qd4f4 Bc5xe3 Qf4xe3 Kg8h8
11 00:02 735.900 477.845 +0.41 Rf1f6
11 00:02 735.900 477.845 +0.37 Rf1f6
11 00:03 1.428.340 470.901 +0.41 Rf1f6 b4b3 a2xb3 Rf8b8 Rf6f4 a6a5 Rd1f1 Be7g5
12 00:05 2.350.388 478.964 +0.30 Rf1f6 Ra8c8 Rf6f4 Qc7a5 Qd4b6 Qa5xb6 Be3xb6 Rc8c6 Bb6a7
13 00:08 3.959.232 481.159 +0.37 Rf1f6 Ra8c8 Rf6f4 Qc7a5 Qd4b6 Qa5xb6 Be3xb6 Rc8c6 Bb6a7 g7g5
14 00:13 6.464.920 483.817 +0.30 Rf1f6 Ra8c8 Rf6f4 Qc7a5 Qd4b6 Qa5xb6 Be3xb6 Rc8c6 Bb6a7 Rf8a8 Ba7g1
15 00:28 13.662.836 495.738 +0.30 Rf1f6 Ra8c8 Rf6f4 Qc7a5 Qd4b6 Qa5xb6 Be3xb6 Rc8c6 Bb6a7 Rf8a8 Ba7g1 Ra8b8 h2h3 Be7g5
16 01:35 45.900.692 493.353 +0.45 Rf1f6 Rf8c8 Rf6f3 Be7c5 Qd4f4 Bc5xe3 Rf3xe3 Qc7a5 Re3g3 Kg8h8 Qf4d4 Rc8c7 Rd1f1
17 04:15 121.588.104 487.661 +0.60 Rf1f6 Rf8c8 Rf6xe6 f7xe6 Qd4g4 Qc7xe5 Be3d4 h6h5 Qg4h3 Qe5f4 Qh3xe6+ Qf4f7 Bd3h7+ Kg8f8
18 05:48 165.518.248 486.354 +0.52 Rf1f6 Rf8c8 Rf6xe6 f7xe6 Qd4g4 Qc7xe5 Be3d4 h6h5 Qg4h3 Qe5f4 Qh3xe6+ Qf4f7 Bd3h7+ Kg8f8

[yanquis1972]

New game
r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1

Analysis by IvanHoe 9.70b x64:

1.Bd2 Qc5 2.Qxc5 Bxc5 3.h3 Rfe8 4.g4 Bd7
= (0.23) Depth: 6 00:00:00 4kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 Bd7 5.Qd4
= (0.24) Depth: 6 00:00:00 4kN
1.g4 a5 2.h3 a4 3.Qf4 b3
+/= (0.28) Depth: 6 00:00:00 7kN
1.g4 a5 2.h3 a4 3.Qf4 b3
+/= (0.28) Depth: 6 00:00:00 7kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 Bd7 5.Qd4
= (0.24) Depth: 7 00:00:00 10kN
1.h4 Rfe8 2.Qf4 Bc5 3.Bd4 Rac8 4.g4 Bxd4 5.Qxd4
+/= (0.26) Depth: 7 00:00:00 12kN
1.h4 Rfe8 2.Qf4 Bc5 3.Bd4 Rac8 4.g4 Bxd4 5.Qxd4
+/= (0.26) Depth: 7 00:00:00 12kN
1.h4 Rfe8 2.Qf4 Bc5 3.Bd4 Rac8 4.g4 Bxd4 5.Qxd4
+/= (0.26) Depth: 8 00:00:00 12kN
1.h4 Rfe8 2.Qf4 Bc5 3.Bd4 Rac8 4.g4 Bxd4 5.Qxd4
+/= (0.26) Depth: 8 00:00:00 12kN
1.h4 Rfe8 2.Rf2 a5 3.Bb5 Rec8 4.Ba4 Rab8 5.g3
= (0.21) Depth: 9 00:00:00 25kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 Rac8 5.g4 Qa5
+/= (0.27) Depth: 9 00:00:00 30kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 Rac8 5.g4 Qa5
+/= (0.27) Depth: 9 00:00:00 34kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 a5 5.Qd4 Kh8 6.g4 a4 7.Bb5
= (0.25) Depth: 10 00:00:00 60kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 a5 5.Qd4 Kh8 6.g4 a4 7.Bb5
= (0.25) Depth: 10 00:00:00 105kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 a5 5.Qd4 Kh8 6.g4 a4 7.Bb5
= (0.25) Depth: 11 00:00:00 136kN
1.Qf4 Bg5 2.Qg3 Bxe3 3.Qxe3 Rfe8 4.h3 a5 5.Qd4 Kh8 6.g4 a4 7.Bb5
= (0.25) Depth: 11 00:00:00 183kN
1.h4 Rfe8 2.Qf4 Kh8 3.Rd2 Qa5 4.Bd4 Rac8 5.Ka1 Qa4 6.Qg3 b3
= (0.24) Depth: 12 00:00:00 378kN
1.Rf3 Rfc8 2.Qf4 Bc5 3.h3 Bxe3 4.Qxe3 Qc5 5.Qxc5 Rxc5 6.Rf4 a5 7.Be2 d4 8.Rfxd4 Rxe5
= (0.25) Depth: 12 00:00:00 871kN
1.Rf3 Rfc8 2.Qf4 Bc5 3.h3 Bxe3 4.Qxe3 Qc5 5.Qxc5 Rxc5 6.Rf4 a5 7.Be2 d4 8.Rfxd4 Rxe5
= (0.25) Depth: 12 00:00:00 923kN
1.Rf3 Rfc8 2.h4 Kh8 3.Rdf1 Bc5 4.Qxc5 Qxc5 5.Bxc5 Rxc5 6.Rf4 a5 7.Rd4 Rac8 8.g4 Kg8
= (0.24) Depth: 13 00:00:00 1440kN
1.Rf3 Rfc8 2.h4 Kh8 3.Rdf1 Bc5 4.Qxc5 Qxc5 5.Bxc5 Rxc5 6.Rf4 a5 7.Rd4 Rac8 8.g4 Kg8
= (0.24) Depth: 13 00:00:00 1852kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Kh8 4.h3 Re8 5.Bd4 Rac8 6.Qf2 Bxd4 7.Qxd4 f6 8.Re1
= (0.22) Depth: 14 00:00:00 2971kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Kh8 4.h3 Re8 5.Bd4 Rac8 6.Qf2 Bxd4 7.Qxd4 f6 8.Re1
= (0.22) Depth: 14 00:00:00 3880kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Re8 6.Qd4 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 15 00:00:01 5639kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Re8 6.Qd4 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 15 00:00:01 6260kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Re8 6.Qd4 Rac8 7.Qxb4 Qxe5 8.Re1 Qf6 9.Bxa6 Rc6 10.Be2 Bf5 11.Rc3 Rxc3 12.Qxc3 Qxc3 13.bxc3
= (0.19) Depth: 16 00:00:01 7203kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Re8 6.Qd4 Rac8 7.Qxb4 Qxe5 8.Re1 Qf6 9.Bxa6 Rc6 10.Be2 Bf5 11.Rc3 Rxc3 12.Qxc3 Qxc3 13.bxc3
= (0.19) Depth: 16 00:00:02 10813kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa7 6.Qf3 Qc5 7.Qf2 Qxf2 8.Rxf2 a5 9.h3 d4 10.Rf1
= (0.15) Depth: 17 00:00:02 13859kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa7 6.Qf3 Qc5 7.Qf2 Qxf2 8.Rxf2 a5 9.h3 d4 10.Rf1
= (0.15) Depth: 17 00:00:05 27465kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa7 6.Qf3 Qc7 7.Qf4 a5 8.Qd4 Qa7 9.Qxa7 Rxa7 10.Rgf3 Re7 11.Ba6 Rc6 12.Bb5 Rc8
= (0.15) Depth: 18 00:00:05 29288kN
1.Rf6
= (0.23 !) Depth: 18 00:00:12 66606kN
1.Rf6
+/= (0.31 !) Depth: 18 00:00:18 105mN
1.Rf6 h5 2.Rf2 Rac8 3.Qf4 a5 4.Ba6 Ra8 5.Be2 h4 6.Bf3 Rad8 7.g3 h3 8.Bd4 Bc5 9.Be2 Bxd4 10.Qxd4 Rfe8 11.Bd3
+/= (0.31) Depth: 18 00:00:27 156mN
1.Rf6 h5 2.Rf2 Rac8 3.Qf4 a5 4.Ba6 Ra8 5.Be2 h4 6.Bf3 Rad8 7.g3 h3 8.Bd4 Bc5 9.Be2 Bxd4 10.Qxd4 Rfe8 11.Bd3
+/= (0.31) Depth: 18 00:00:27 157mN
1.Rf6 h5 2.Rf2 Rac8 3.h3 a5 4.g4 h4 5.g5 g6 6.Ba6 Bc5 7.Qf4 Bxe3 8.Qxe3 Rb8 9.Qd4 Rfe8 10.Bd3 a4 11.Rf6
+/= (0.26) Depth: 19 00:00:33 189mN
1.Rf6 h5 2.Rf2 Rac8 3.h3 a5 4.g4 h4 5.g5 g6 6.Ba6 Bc5 7.Qf4 Bxe3 8.Qxe3 Rb8 9.Qd4 Rfe8 10.Bd3 a4 11.Rf6
+/= (0.26) Depth: 19 00:00:34 196mN
1.Rf6 h5 2.Rf2 Rac8 3.h3 a5 4.g4 h4 5.g5 g6 6.Ba6 Bc5 7.Qf4 Bxe3 8.Qxe3 Qc5 9.Qf4 Rc6 10.Bf1 Bf5 11.Bd3 Bxd3 12.Rxd3 Re6
+/= (0.34 !) Depth: 20 00:00:44 255mN
1.Rf6 h5 2.Rdf1 Rfc8 3.R6f3 Rab8 4.b3 g6 5.h3 a5 6.g4 h4 7.Bh6 Qc5 8.Qe3 Ra8 9.Qxc5 Bxc5 10.Rf6 Be7 11.R6f2 g5
= (0.22) Depth: 20 00:00:53 299mN
1.Rf6 h5 2.Rdf1 Rfc8 3.R6f3 Rab8 4.b3 g6 5.h3 a5 6.g4 h4 7.Bh6 Qc5 8.Qe3 Ra8 9.Qxc5 Bxc5 10.Rf6 Be7 11.R6f2 g5
= (0.22) Depth: 20 00:00:57 324mN
1.Rf6 h5 2.Rdf1 Rfc8 3.R6f3 Rab8 4.b3 g6 5.h3 a5 6.g4 h4 7.Bh6 Qc5 8.Qe3 Qxe3 9.Bxe3 Ra8 10.Bb5 Bc5 11.Kb2 Bxe3 12.Rxe3 d4 13.Rd3 Rc3
+/= (0.30 !) Depth: 21 00:01:06 374mN
1.Rf6 h5 2.Rdf1 Rfc8 3.R6f3 Rab8 4.b3 g6 5.Qf4 Bf8 6.h3 a5 7.g4 hxg4 8.hxg4 a4 9.Bd4 Ra8 10.Rh1 axb3 11.axb3 Re8 12.Rfh3
= (0.23) Depth: 21 00:01:15 430mN
1.Rf6 h5 2.Rdf1 Rfc8 3.R6f3 Rab8 4.b3 g6 5.Qf4 Bf8 6.h3 a5 7.g4 hxg4 8.hxg4 a4 9.Bd4 Ra8 10.Rh1 axb3 11.axb3 Re8 12.Rfh3
= (0.23) Depth: 21 00:01:24 478mN

(, Microsoft 25.01.2010)

[govert]

Stockfish 1.6 sticks with Rf3 at leat until ply 24:


Stockfish-16-ja:
1 00:00 138 2.936 +1,85 Qd4f4
2 00:00 224 4.765 +0,92 Qd4f4 f7f5
3 00:00 764 16.255 +0,16 Qd4f4 Be7g5 Qf4d4
3 00:00 1.272 27.063 +0,68 Kb1c1 Rf8c8 Qd4f4
3 00:00 1.635 34.787 +0,92 Be3d2 Kg8h8 Qd4e3
4 00:00 2.007 42.702 +0,88 Be3d2 Kg8h8 Bd2xb4 Be7xb4 Qd4xb4 Qc7xe5
4 00:00 2.574 54.765 +1,09 g2g4 Rf8b8 Qd4f4 Be7g5
5 00:00 4.238 90.170 +0,92 g2g4 Rf8b8 h2h4 Kg8h8 g4g5 h6xg5 h4xg5
6 00:00 8.072 171.744 +0,64 g2g4 Rf8b8 Be3d2 a6a5 Qd4f4 Be7g5
6 00:00 13.901 220.650 +0,88 h2h4 Kg8h8 Qd4f4 Rf8c8 Qf4g3 f7f5
7- 00:00 39.551 420.755 +0,64 h2h4 f7f5 e5xf6/ep Be7xf6 Qd4xb4 Rf8b8
8 00:00 77.272 548.028 +0,68 h2h4 f7f5 Qd4f4 Be7c5 Be3xc5 Qc7xc5 h4h5 Ra8c8 g2g4 f5xg4
9 00:00 113.200 602.127 +0,68 h2h4 f7f5 Qd4f4 Be7c5 Be3xc5 Qc7xc5 h4h5 Ra8c8 g2g4 f5xg4
10 00:00 212.542 646.024 +0,80 h2h4 Rf8c8 Qd4f4 Kg8h8 Qf4g3 Qc7d8 Rf1f4 Qd8a5 Be3d4 g7g6
11 00:00 344.443 710.191 +0,68 h2h4 Rf8c8 Qd4f4 Kg8h8 Qf4g3 Qc7d8 Rf1f4 Qd8a5 b2b3 Qa5a3 Rf4f1 Ra8b8 Be3c1 Qa3a5
12 00:01 919.542 763.739 +0,68 h2h4 Rf8c8 Qd4f4 Kg8h8 Rf1f3 Qc7a5 b2b3 g7g5 h4xg5 Be7xg5 Qf4d4 Qa5a3 Be3xg5 h6xg5
13- 00:01 1.505.390 783.241 +0,48 h2h4 Rf8c8 Qd4f4 a6a5 Qf4g3 Kg8h8 Qg3f4 Be7c5 Rd1e1 Bc5xe3 Re1xe3 a5a4 Qf4xb4 a4a3
14 00:07 5.720.749 795.874 +0,48 h2h4 Rf8c8 Qd4f4 a6a5 Rf1f3 Kg8h8 Rf3g3 Be7f8 Be3d2 a5a4 Rd1c1 a4a3 b2b3 g7g6 Rc1f1 h6h5 Rg3e3 Kh8g8 Bd2xb4 Bf8xb4 Qf4xb4
15 00:15 12.449.499 807.255 +0,16 h2h4 a6a5 Rf1f3 h6h5 Rd1f1 a5a4 Rf3g3 a4a3 Be3h6 Be6g4 e5e6 g7xh6 Rg3xg4+ h5xg4 e6xf7+ Rf8xf7 Rf1xf7 Kg8xf7 Qd4xd5+ Kf7g7 Qd5xa8 a3xb2
15 00:26 21.227.141 815.456 +0,64 Rf1f3 Rf8c8 Rd1f1 a6a5 Rf3g3 Kg8f8 h2h4 Be7c5 Qd4f4 Bc5xe3 Rg3xe3 Kf8g8 Re3g3 Kg8h8 Rf1f2 Qc7c5 h4h5
16 00:38 31.311.662 816.620 +0,60 Rf1f3 Kg8h8 Rf3g3 Rf8c8 Qd4f4 Rc8g8 h2h4 Ra8c8 Rd1f1 Qc7a5 b2b3 Qa5c7 Rf1h1 f7f6 e5xf6 Be7xf6 Qf4xc7 Rc8xc7 Bd3xa6
17 00:56 46.431.496 818.190 +0,52 Rf1f3 Kg8h8 Rd1f1 Ra8c8 h2h4 Be7c5 Qd4xc5 Qc7xc5 Be3xc5 Rc8xc5 Bd3xa6 d5d4 a2a4 b4xa3/ep Rf3xa3 Rc5xe5 Ba6d3 Rf8e8 Ra3a7 Be6d5 b2b4 Kh8g8
18+ 01:53 93.002.878 822.037 +0,72 Rf1f3 Rf8c8 Rd1f1 a6a5 Rf3g3 Kg8f8 h2h4 Be7c5 Qd4f4 Bc5xe3 Qf4xe3 a5a4 Rg3g6 Kf8g8 Qe3xh6 f7xg6 Qh6xg6 Be6f7 Qg6h7+ Kg8f8 Qh7h8+
19 03:36 178.744.014 825.870 +0,52 Rf1f3 Kg8h8 Rf3g3 Rf8g8 Rd1f1 Ra8c8 h2h4 a6a5 Rg3f3 Be7f8 Rf3f2 Bf8c5 Qd4xc5 Qc7xc5 Be3xc5 Rc8xc5 Rf2xf7 Be6xf7 Rf1xf7 Rg8c8 e5e6 Kh8g8 Kb1c1
20 19:11 896.806.658 778.650 +0,80 Rf1f3 f7f6 Bd3f5 Be6xf5 Rf3xf5 Ra8d8 e5xf6 Be7xf6 Qd4d3 Qc7d6 Rf5xd5 Qd6xd5 Qd3xd5+ Rd8xd5 Rd1xd5 Rf8e8 Rd5d3 Kg8f7 a2a3 a6a5 a3xb4 a5xb4 h2h3 Re8c8 Be3d2 Rc8c4
21 42:48 2.019.546.207 786.396 +0,88 Rf1f3 f7f6 Bd3f5 Be6xf5 Rf3xf5 Ra8d8 e5xf6 Be7xf6 Qd4d3 Qc7d6 Rf5xd5 Qd6xd5 Qd3xd5+ Rd8xd5 Rd1xd5 Kg8f7 Rd5d3 Rf8c8 Kb1c1 Rc8e8 g2g3 Kf7g6 c2c4 b4xc3/ep b2xc3 Re8c8 Kc1c2 Bf6e5 Be3d4 Be5d6
22 55:33 2.649.152 552 794.827 +0,84 Rf1f3 f7f6 Bd3f5 Be6xf5 Rf3xf5 Ra8d8 e5xf6 Be7xf6 Qd4d3 Qc7d6 Rf5xd5 Qd6xd5 Qd3xd5+ Rd8xd5 Rd1xd5 Kg8f7 Rd5d3 Rf8c8 Kb1c1 Rc8e8 g2g3 g7g5 a2a3 a6a5 a3xb4 a5xb4 Be3c5 Re8e2 h2h3 Bf6e7
23- 1:10:11 3.389.969 829 804.997 +0,64 Rf1f3 f7f6 Bd3f5 Be6xf5 Rf3xf5 Ra8d8 e5xf6 Be7xf6
24 2:09:14 5.886.730 310 759.142 +0,76 Rf1f3 f7f6 Bd3f5 Be6xf5 Rf3xf5 Ra8d8 e5xf6 Be7xf6 Qd4d3 Qc7xh2 Be3c5 Rf8f7 g2g3 Rd8c8 Bc5xb4 Rf7b7 a2a3 Rb7c7 Rd1d2 Qh2h1+ Kb1a2 Qh1e4 c2c3 Qe4xd3 Rd2xd3 d5d4 c3xd4 Rc7c2 Ka2b3 Rc2e2 Rf5c5 Rc8d8 Rc5c4

[Albert Silver]

How long to find best move 19. Rf6 ?
[d] r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1

From a recent Nunn2 match FireBird 1.0 beta w32 - Rybka 3 32-bit,
(Centrino DualCore T8300, 2100 Mhz, 40m/40+20m/40+20m)
You can see difference in time between FB1.0 beta and Rybka 3
Actually in the game FB played this after 1:39 min:sec

Analysis by Rybka 3 32-bit 2CPU (Centrino DualCore T8300, 2100 Mhz)
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Rc5 26.Rf4 a5
= (0.15) Depth: 14 00:00:38 2615kN
19.Rf6
+/= (0.42 !) Depth: 14 00:02:19 8908kN
19.Rf6 Rfc8 20.Rxe6 fxe6[] 21.Qg4[] Qxe5 22.Bd4 h5 23.Qg6 Qxd4 24.Qh7+[] Kf8 25.Qh8+[] Kf7[] 26.Qxh5+[] Kf8[] 27.Bg6 Qxd1+ 28.Qxd1 Bc5 29.Qg4 Ke7 30.Bh5 Rf8 31.Qxg7+ Kd6 32.Bf7 Ke7[]
+/= (0.39) Depth: 14 00:02:24 9301kN

Firebird 1.0 beta 32-bit 2CPU
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Ra7 26.Ref3 a5 27.Rf4 Kg8 28.Rd4 Re7 29.Be2
= (0.16) Depth: 19 00:00:34 49296kN
19.Rf6
= (0.24) Depth: 19 00:01:35 144mN
19.Rf6
+/= (0.32) Depth: 19 00:02:05 188mN

grts Bram

I get slightly different times, and not just in speed. Did you clear the hash when running this?


Analysis by Rybka 3:


1.h4 Kh8 2.Rf4 Rac8 3.Qa7 Qxa7 4.Bxa7 a5 5.Bb6
= (0.23) Depth: 11 00:00:02 321kN
1.h4 Rac8 2.Qf4 a5 3.Qg3 Kh8 4.Rf3 Qc6 5.Rf4
= (0.12) Depth: 12 00:00:07 931kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Kh8 4.Rf1 Bxe3
= (0.23) Depth: 12 00:00:08 1057kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h3 Qxe3 7.Rxe3 Kg8
+/= (0.26) Depth: 13 00:00:12 1636kN
1.Rf3 Rfc8 2.Qf4 Qa5 3.Bd2 Rab8 4.h4 Kh8 5.Rg3 Bf8 6.a3
= (0.22) Depth: 14 00:00:17 2215kN
1.Rf6 Rfc8 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qg6 Qxd4 6.Qh7+ Kf8 7.Qh8+
+/= (0.42) Depth: 14 00:00:45 5401kN
1.Rf6 h5 2.Rdf1 Rac8 3.R6f3 a5 4.Rg3 h4 5.Rgf3 Rfe8 6.R1f2 Qc5 7.Qf4
+/= (0.33) Depth: 15 00:01:17 9033kN
1.Rf6 h5 2.Rdf1 Rac8 3.R6f3 a5 4.Rg3 h4 5.Rgf3 Rfe8 6.Bf2 g5 7.g3 Qb8
+/= (0.30) Depth: 16 00:01:44 12527kN


Analysis by FireBird 1.0 beta x64:

1.Rf3 Kh8 2.Rg3 Rfe8 3.Rf1 Bf8 4.h4 Be7 5.Qf4 Rac8 6.Bd4 Qa5 7.Ka1
+/= (0.27) Depth: 11 00:00:00 408kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h3
= (0.25) Depth: 12 00:00:00 764kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h3
= (0.25) Depth: 12 00:00:00 861kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5
= (0.23) Depth: 13 00:00:00 991kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5
= (0.23) Depth: 13 00:00:00 1348kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 14 00:00:00 1510kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 14 00:00:01 1956kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa5 6.Qd4 Rc6 7.h4 Re8 8.h5 Qc7 9.Ka1
= (0.19) Depth: 15 00:00:01 2904kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa5 6.Qd4 Rc6 7.h4 Re8 8.h5 Qc7 9.Ka1
= (0.19) Depth: 15 00:00:02 4511kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Qxe3 7.Rxe3 a5 8.Ref3 Kg8 9.Rg3 Rc7 10.Rf6
= (0.21) Depth: 16 00:00:02 5069kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Qxe3 7.Rxe3 a5 8.Ref3 Kg8 9.Rg3 Rc7 10.Rf6
= (0.21) Depth: 16 00:00:02 6827kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Rab8 7.h5 Qxe3 8.Rxe3 Rc6 9.Ref3 Kg8 10.Rg3 d4
= (0.20) Depth: 17 00:00:03 8224kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Rab8 7.h5 Qxe3 8.Rxe3 Rc6 9.Ref3 Kg8 10.Rg3 d4
= (0.20) Depth: 17 00:00:05 12615kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5
= (0.17) Depth: 18 00:00:06 15710kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5
= (0.17) Depth: 18 00:00:09 24956kN
1.Rf3! Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5 12.Bb5
= (0.25) Depth: 19 00:00:15 40855kN
1.Rf3 Rfc8 2.Rdf1 Bc5 3.Qf4 Bxe3 4.Rxe3 Qe7 5.Rg3 Kh8 6.Qd4 a5 7.Rf4 Qc7 8.Qe3 Qc5 9.Qxc5 Rxc5 10.Rd4 Rac8 11.Rf3 Kg8
= (0.17) Depth: 19 00:00:15 42207kN
1.Rf6!
+/= (0.33) Depth: 19 00:00:51 146mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 19 00:01:19 224mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 19 00:01:19 225mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 20 00:01:27 248mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 20 00:01:31 257mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3 Bg5
+/= (0.28) Depth: 21 00:01:45 296mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3 Bg5
+/= (0.28) Depth: 21 00:01:52 317mN

[beram]

How long to find best move 19. Rf6 ?
[d] r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1

From a recent Nunn2 match FireBird 1.0 beta w32 - Rybka 3 32-bit,
(Centrino DualCore T8300, 2100 Mhz, 40m/40+20m/40+20m)
You can see difference in time between FB1.0 beta and Rybka 3
Actually in the game FB played this after 1:39 min:sec

Analysis by Rybka 3 32-bit 2CPU (Centrino DualCore T8300, 2100 Mhz)
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Rc5 26.Rf4 a5
= (0.15) Depth: 14 00:00:38 2615kN
19.Rf6
+/= (0.42 !) Depth: 14 00:02:19 8908kN
19.Rf6 Rfc8 20.Rxe6 fxe6[] 21.Qg4[] Qxe5 22.Bd4 h5 23.Qg6 Qxd4 24.Qh7+[] Kf8 25.Qh8+[] Kf7[] 26.Qxh5+[] Kf8[] 27.Bg6 Qxd1+ 28.Qxd1 Bc5 29.Qg4 Ke7 30.Bh5 Rf8 31.Qxg7+ Kd6 32.Bf7 Ke7[]
+/= (0.39) Depth: 14 00:02:24 9301kN

Firebird 1.0 beta 32-bit 2CPU
19.Rf3 Rfc8 20.Rg3 Bc5 21.Qf4 Bxe3 22.Qxe3 Kh8 23.Rf1 Qc5 24.h3 Qxe3 25.Rxe3 Ra7 26.Ref3 a5 27.Rf4 Kg8 28.Rd4 Re7 29.Be2
= (0.16) Depth: 19 00:00:34 49296kN
19.Rf6
= (0.24) Depth: 19 00:01:35 144mN
19.Rf6
+/= (0.32) Depth: 19 00:02:05 188mN

grts Bram

I get slightly different times, and not just in speed. Did you clear the hash when running this?


Analysis by Rybka 3:


1.h4 Kh8 2.Rf4 Rac8 3.Qa7 Qxa7 4.Bxa7 a5 5.Bb6
= (0.23) Depth: 11 00:00:02 321kN
1.h4 Rac8 2.Qf4 a5 3.Qg3 Kh8 4.Rf3 Qc6 5.Rf4
= (0.12) Depth: 12 00:00:07 931kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Kh8 4.Rf1 Bxe3
= (0.23) Depth: 12 00:00:08 1057kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h3 Qxe3 7.Rxe3 Kg8
+/= (0.26) Depth: 13 00:00:12 1636kN
1.Rf3 Rfc8 2.Qf4 Qa5 3.Bd2 Rab8 4.h4 Kh8 5.Rg3 Bf8 6.a3
= (0.22) Depth: 14 00:00:17 2215kN
1.Rf6 Rfc8 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qg6 Qxd4 6.Qh7+ Kf8 7.Qh8+
+/= (0.42) Depth: 14 00:00:45 5401kN
1.Rf6 h5 2.Rdf1 Rac8 3.R6f3 a5 4.Rg3 h4 5.Rgf3 Rfe8 6.R1f2 Qc5 7.Qf4
+/= (0.33) Depth: 15 00:01:17 9033kN
1.Rf6 h5 2.Rdf1 Rac8 3.R6f3 a5 4.Rg3 h4 5.Rgf3 Rfe8 6.Bf2 g5 7.g3 Qb8
+/= (0.30) Depth: 16 00:01:44 12527kN


Analysis by FireBird 1.0 beta x64:

1.Rf3 Kh8 2.Rg3 Rfe8 3.Rf1 Bf8 4.h4 Be7 5.Qf4 Rac8 6.Bd4 Qa5 7.Ka1
+/= (0.27) Depth: 11 00:00:00 408kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h3
= (0.25) Depth: 12 00:00:00 764kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h3
= (0.25) Depth: 12 00:00:00 861kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5
= (0.23) Depth: 13 00:00:00 991kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5
= (0.23) Depth: 13 00:00:00 1348kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 14 00:00:00 1510kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Qd4 Re8 6.Rf1 Rac8 7.h4 Qa5 8.Ka1 Qc5
= (0.23) Depth: 14 00:00:01 1956kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa5 6.Qd4 Rc6 7.h4 Re8 8.h5 Qc7 9.Ka1
= (0.19) Depth: 15 00:00:01 2904kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qa5 6.Qd4 Rc6 7.h4 Re8 8.h5 Qc7 9.Ka1
= (0.19) Depth: 15 00:00:02 4511kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Qxe3 7.Rxe3 a5 8.Ref3 Kg8 9.Rg3 Rc7 10.Rf6
= (0.21) Depth: 16 00:00:02 5069kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Qxe3 7.Rxe3 a5 8.Ref3 Kg8 9.Rg3 Rc7 10.Rf6
= (0.21) Depth: 16 00:00:02 6827kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Rab8 7.h5 Qxe3 8.Rxe3 Rc6 9.Ref3 Kg8 10.Rg3 d4
= (0.20) Depth: 17 00:00:03 8224kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.h4 Rab8 7.h5 Qxe3 8.Rxe3 Rc6 9.Ref3 Kg8 10.Rg3 d4
= (0.20) Depth: 17 00:00:05 12615kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5
= (0.17) Depth: 18 00:00:06 15710kN
1.Rf3 Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5
= (0.17) Depth: 18 00:00:09 24956kN
1.Rf3! Rfc8 2.Rg3 Bc5 3.Qf4 Bxe3 4.Qxe3 Kh8 5.Rf1 Qc5 6.Rf4 Qxe3 7.Rxe3 a5 8.Re1 Kg8 9.Ref1 Rc7 10.Rd4 Re8 11.h3 h5 12.Bb5
= (0.25) Depth: 19 00:00:15 40855kN
1.Rf3 Rfc8 2.Rdf1 Bc5 3.Qf4 Bxe3 4.Rxe3 Qe7 5.Rg3 Kh8 6.Qd4 a5 7.Rf4 Qc7 8.Qe3 Qc5 9.Qxc5 Rxc5 10.Rd4 Rac8 11.Rf3 Kg8
= (0.17) Depth: 19 00:00:15 42207kN
1.Rf6!
+/= (0.33) Depth: 19 00:00:51 146mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 19 00:01:19 224mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 19 00:01:19 225mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 20 00:01:27 248mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3
+/= (0.28) Depth: 20 00:01:31 257mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3 Bg5
+/= (0.28) Depth: 21 00:01:45 296mN
1.Rf6 h5 2.Rdf1 a5 3.Qh4 Bg4 4.Qg5 Rac8 5.h3 Be2 6.Bb6 Qxb6 7.Rxb6 Bxg5 8.Bxe2 Rce8 9.Bxh5 Rxe5 10.Rb5 Bf6 11.Bf3 d4 12.Rxe5 Bxe5 13.Bd5 Bf6 14.Re1 Rd8 15.Bb3 Rc8 16.g3 Bg5
+/= (0.28) Depth: 21 00:01:52 317mN

I started for each time a brand new Fritz 12 gui session. I have a 32 bit win XP system. Fritzmark = 6,14

[beram]

Are you sure this is winning or at least a lot better than other moves? The scores are not very high.

Besides that it is a very nice sac, I am pretty sure it is the best and it is winning against Rybka. But I am not a grandmaster (my ELO 1994)

grts Bram

[beram]

Are you sure this is winning or at least a lot better than other moves? The scores are not very high.

A few extra analysis

[Event "?"]
[Site "?"]
[Date "2010.01.26"]
[Round "?"]
[White "Test 19. Rf6 ! FB1.0 beta Rybka 3"]
[Black "?"]
[Result "1-0"]
[Annotator "Mourik,Bram"]
[SetUp "1"]
[FEN "r4rk1/2q1bpp1/p3b2p/3pP3/1p1Q4/3BB3/PPP3PP/1K1R1R2 w - - 0 1"]
[PlyCount "33"]

1. Rf6 Rfc8 (1... h5 {played in the testgame FB - Rybka} 2. Rdf1 Rfc8 3. Qh4 $1
$16 {also a not so obvious move, but Rxf7 with white giving up his rooks for
the bishop pair is even more esthetic} (3. Rxf7 $5 Bxf7 4. Rxf7 Kxf7 5. Qxd5+
Kf8 6. Qf3+ Kg8 7. Qxh5 Qc6 8. Bh7+ Kf8 9. Bf5) 3... Bg4 (3... Qxe5 4. Bd4 Bxf6
5. Rxf6 Qd6 6. Qxh5 Rc4 7. Qh7+ Kf8 8. Bxc4 gxf6 9. Qh8+ Ke7 10. Bxf6+ Kd7 11.
Bb5+ axb5 12. Qxa8 $18) 4. Qg5) (1... Rac8 $2 2. Bxh6 $18 Bxf6 3. exf6 Qxh2 4.
Bxg7) (1... a5 $2 2. Bxh6 $18 Bxf6 3. exf6 Qxh2 4. Bxg7) 2. Rxe6 {this is a
forced move line of 12 moves} fxe6 3. Qg4 Qxe5 4. Bd4 h5 5. Qg6 Qxd4 6. Qh7+
Kf8 7. Qh8+ Kf7 8. Qxh5+ Kf8 9. Bg6 Qxd1+ 10. Qxd1 Bc5 11. Qf3+ Ke7 12. Qf7+
Kd6 13. Qxg7 {so here we must evaluate whether this is a won position. I think
it is white who has the best chances and probably a win} Rf8 14. Bf7 Ke7 15.
Bh5+ Kd6 16. Qg3+ Kd7 17. Bf3 $16 1-0

[govert]

Stockfish still doesn't like Rf6.
Analysis after Rf6 Rfc8:

13 00:03 3.715.888 932.468 +0,40 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
14 00:05 5.701.220 978.078 +0,36 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
15 00:07 7.376.040 991.669 +0,36 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
16 00:12 13.050.965 1.031.126 +0,36 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
17 00:32 33.965.933 1.056.778 +0,40 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
18 00:58 62.231.439 1.064.895 +0,40 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
19- 01:51 116.692.357 1.048.759 +0,20 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
20 03:29 202.678.360 967.138 +0,28 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
21 07:14 429.719.226 989.627 +0,16 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
22 12:24 743.173.970 997.834 +0,16 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 [...]
23 29:04 1.668.637.032 956.471 +0,24 2.Rxe6 fxe6 3.Qg4 Qxe5 4.Bd4 h5 5.Qh3 Qf4 6.Qxe6+ Qf7 7.Bh7+ Kf8 8.Bf5 Rc4 9.b3 Rxd4 10.Rxd4 Rd8 11.Qg6 h4 12.Rf4 a5 13.Rf1 Qxg6 14.Bxg6+ Bf6 15.Re1 Bc3 16.Re6 Kg8 17.Bh5 Rf8 18.Bf3 Kh7 19.Rd6 Re8 20.Rxd5 Re1+ 21.Bd1 Kg6 22.Kc1

24- 1:29:36 5.244.509 549 975.533 +0,04 2.Rxe6 fxe6 3.Qg4 Qxe5
24+ 4:46:01 9.302.558 478 542.072 +0,44 2.Rf3 g5 3.Rg3 Qa5 4.Qh4 d4 5.Bxd4 Qxa2+ 6.Kc1
25 6:58:36 12.412.687 017 494.198 +0,04 2.Rf3 Bc5 3.Qh4 Bxe3 4.Rxe3 a5 5.Rf1 Qd8 6.Qh5 Qg5 7.Qxg5 hxg5 8.h3 g4 9.hxg4 Bxg4 10.Rg3 Be6 11.Rh1 Kf8 12.Kc1 g6 13.Kd2 Ke7 14.Rf3 Rh8 15.Rff1 Rac8 16.Rxh8 Rxh8