Test position

[tttony]

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

[Ajedrecista]

Hello Tony:

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

Qf6+ was tempting for this position, even for me. OTOH, Spark is Spark...

Analysis by Spark 1.0 w32 (using two cores) in an Intel Pentium D930 (3 GHz), with 512 MB of hash, running under Arena 2.0.1 GUI:

FEN: r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

Spark-1.0-win32-mp:

1 00:00 1 0 -0,53 h2h3
1 00:00 11 0 -0,50 Nc3e2
1 00:00 19 0 -0,39 Be3c1
1 00:00 21 0 -0,33 Be3d2
1 00:00 66 0 -0,09 Rg3h3
1 00:00 84 0 -0,01 Ke1f1

2/1 00:00 129 0 -0,05 Ke1f1 Bb7c6
2/1 00:00 1.287 0 +0,02 Rg3h3 Rf8h8

3/2 00:00 1.604 0 -0,24 Rg3h3 Rf8h8 Rh4f4
3/2 00:00 1.928 0 +0,11 Ke1f1 Bb7c6 Rg3h3

4/4 00:00 2.994 0 +0,07 Ke1f1 Rf8h8 Kf1g1 Bb7c6

5/6 00:00 4.401 0 +0,05 Ke1f1 Rf8h8 Kf1g1 Bb7c6 Be3d2

6/10 00:00 10.060 0 +0,05 Ke1f1 Rf8h8 Kf1g1 Bb7c6 Be3d2 Qd8c7

7/13 00:00 21.189 0 +0,02 Ke1f1 Rf8h8 Rh4f4 Qd8e8 Kf1g1 Bb7c6 Be3d2

8/16- 00:00 53.980 0 -0,23 Ke1f1 Rf8h8 Rh4f4 Qd8e8 Kf1g1 Bb7c6 Be3d2
8/18 00:00 171.687 783.958 -0,25 Ke1f1 Rf8h8 Be3f4 Bb7c6 Kf1g1 Qd8c7 Rg3h3 d5d4

9/18 00:00 247.204 879.729 -0,32 Ke1f1 Rf8h8 Be3d2 Qd8c7 Qf3f4 d5d4 Nc3e4 Bb7xe4 Qf4xe4

10/20 00:00 500.647 1.001.294 -0,41 Ke1f1 Rf8h8 Be3d2 Qd8a5 Kf1g2 Qa5a1 Rh4f4 Ra8f8 Nc3a4 Bb7c6
10/21 00:00 675.879 983.812 -0,40 Nc3a4 Qd8a5+ Ke1f1 Qa5b5+ c2c4 d5xc4 b3xc4 Bb7xf3 c4xb5 a6xb5 Rg3xf3 Ra8xa4 Rh4xa4 b5xa4

11/24- 00:01 1.384.859 1.030.401 -0,65 Nc3a4 Qd8a5+ Ke1f1 Qa5b5+ c2c4 d5xc4 b3xc4 Bb7xf3 c4xb5 a6xb5 Rg3xf3 Ra8xa4 Rh4xa4 b5xa4
11/24 00:01 1.594.560 1.041.515 -0,23 Ke1f1 Ra8b8 Be3d2 Qd8c7 Rg3h3 Rf8h8 Qf3f4 d5d4 Nc3e4 Bb7xe4 Qf4xe4

12/25 00:02 2.716.978 1.086.791 -0,18 Ke1f1 Ra8b8 Be3d2 Qd8c7 Qf3f4 Kg7g8 Rg3f3 d5d4 Nc3e4 h7h5 Kf1g1 Bb7c6

13/28 00:04 4.883.566 1.120.340 -0,21 Ke1f1 Ra8b8 Be3d2 Bb7c6 Rg3h3 Rf8h8 Rh4f4 Qd8e8 Rf4h4 d5d4 Nc3e4 c5c4 Ne4d6 Bc6xf3 Nd6xe8+ Rh8xe8 Rh3xf3 c4xb3
13/32+ 00:06 7.866.056 1.170.718 +0,07 Qf3f6+ Be7xf6
13/32+ 00:07 8.239.937 1.166.799 +3,82 Qf3f6+ Be7xf6
13/34 00:09 10.966.072 1.216.290 +4,69 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3xc5 Rf8e8 Rh4xh7 d5d4 Bc5xd4+ e6e5 Bd4c5 Bb7c6 Rg3e3 Re8h8 Rh7xh8 Ra8xh8 Bc5d6

14/34 00:10 13.124.862 1.249.986 +4,63 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3xc5 Rf8e8 Rh4xh7 d5d4 Bc5xd4+ e6e5 Bd4e3 Re8h8 Be3g5+ Kf6e6 Rg3h3 Rh8xh7 Rh3xh7 Bb7f3 Rh7h3

15/34+ 00:13 16.840.744 1.266.507 +4,88 Qf3f6+ Be7xf6
15/40 00:15 19.750.770 1.295.132 +4,94 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Rh4xh7 d5d4 Nc3a4 Rf8c8 Na4b6 Rc8d8 Ke1d2 Bb7e4 Nb6c4 g6g5 Rh7h5

16/40 00:18 24.820.463 1.337.165 +5,07 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7g8 Bh6xf8 Ra8xf8 Nc3a4 Bb7c6 Na4xc5 a6a5 Ke1d2 Rf8c8 Nc5d3 Bc6b5 Rg3g1 Kg8g7 Nd3e5 f7f6

17/40+ 00:23 31.381.579 1.340.749 +5,32 Qf3f6+ Be7xf6
17/42 00:27 37.443.169 1.378.005 +5,36 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 Rf3e3

18/46 00:38 55.764.625 1.445.503 +5,35 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 d5d4

19/51 01:03 91.048.677 1.445.584 +5,38 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 Bc6b5 Rf3e3
19/52 02:00 171.131.794 1.420.923 +5,38 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 Bc6b5 Rf3e3

I stopped the analysis after two minutes; Qf6+ was found in only 6719 ms in my slow computer!

Regards from Spain.

Ajedrecista.

[Terry McCracken]

I don't know about my computer, yet but I would play Qf6+!!

[Terry McCracken]

Hello Tony:

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

Qf6+ was tempting for this position, even for me. OTOH, Spark is Spark...

Analysis by Spark 1.0 w32 (using two cores) in an Intel Pentium D930 (3 GHz), with 512 MB of hash, running under Arena 2.0.1 GUI:

FEN: r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

Spark-1.0-win32-mp:

1 00:00 1 0 -0,53 h2h3
1 00:00 11 0 -0,50 Nc3e2
1 00:00 19 0 -0,39 Be3c1
1 00:00 21 0 -0,33 Be3d2
1 00:00 66 0 -0,09 Rg3h3
1 00:00 84 0 -0,01 Ke1f1

2/1 00:00 129 0 -0,05 Ke1f1 Bb7c6
2/1 00:00 1.287 0 +0,02 Rg3h3 Rf8h8

3/2 00:00 1.604 0 -0,24 Rg3h3 Rf8h8 Rh4f4
3/2 00:00 1.928 0 +0,11 Ke1f1 Bb7c6 Rg3h3

4/4 00:00 2.994 0 +0,07 Ke1f1 Rf8h8 Kf1g1 Bb7c6

5/6 00:00 4.401 0 +0,05 Ke1f1 Rf8h8 Kf1g1 Bb7c6 Be3d2

6/10 00:00 10.060 0 +0,05 Ke1f1 Rf8h8 Kf1g1 Bb7c6 Be3d2 Qd8c7

7/13 00:00 21.189 0 +0,02 Ke1f1 Rf8h8 Rh4f4 Qd8e8 Kf1g1 Bb7c6 Be3d2

8/16- 00:00 53.980 0 -0,23 Ke1f1 Rf8h8 Rh4f4 Qd8e8 Kf1g1 Bb7c6 Be3d2
8/18 00:00 171.687 783.958 -0,25 Ke1f1 Rf8h8 Be3f4 Bb7c6 Kf1g1 Qd8c7 Rg3h3 d5d4

9/18 00:00 247.204 879.729 -0,32 Ke1f1 Rf8h8 Be3d2 Qd8c7 Qf3f4 d5d4 Nc3e4 Bb7xe4 Qf4xe4

10/20 00:00 500.647 1.001.294 -0,41 Ke1f1 Rf8h8 Be3d2 Qd8a5 Kf1g2 Qa5a1 Rh4f4 Ra8f8 Nc3a4 Bb7c6
10/21 00:00 675.879 983.812 -0,40 Nc3a4 Qd8a5+ Ke1f1 Qa5b5+ c2c4 d5xc4 b3xc4 Bb7xf3 c4xb5 a6xb5 Rg3xf3 Ra8xa4 Rh4xa4 b5xa4

11/24- 00:01 1.384.859 1.030.401 -0,65 Nc3a4 Qd8a5+ Ke1f1 Qa5b5+ c2c4 d5xc4 b3xc4 Bb7xf3 c4xb5 a6xb5 Rg3xf3 Ra8xa4 Rh4xa4 b5xa4
11/24 00:01 1.594.560 1.041.515 -0,23 Ke1f1 Ra8b8 Be3d2 Qd8c7 Rg3h3 Rf8h8 Qf3f4 d5d4 Nc3e4 Bb7xe4 Qf4xe4

12/25 00:02 2.716.978 1.086.791 -0,18 Ke1f1 Ra8b8 Be3d2 Qd8c7 Qf3f4 Kg7g8 Rg3f3 d5d4 Nc3e4 h7h5 Kf1g1 Bb7c6

13/28 00:04 4.883.566 1.120.340 -0,21 Ke1f1 Ra8b8 Be3d2 Bb7c6 Rg3h3 Rf8h8 Rh4f4 Qd8e8 Rf4h4 d5d4 Nc3e4 c5c4 Ne4d6 Bc6xf3 Nd6xe8+ Rh8xe8 Rh3xf3 c4xb3
13/32+ 00:06 7.866.056 1.170.718 +0,07 Qf3f6+ Be7xf6
13/32+ 00:07 8.239.937 1.166.799 +3,82 Qf3f6+ Be7xf6
13/34 00:09 10.966.072 1.216.290 +4,69 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3xc5 Rf8e8 Rh4xh7 d5d4 Bc5xd4+ e6e5 Bd4c5 Bb7c6 Rg3e3 Re8h8 Rh7xh8 Ra8xh8 Bc5d6

14/34 00:10 13.124.862 1.249.986 +4,63 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3xc5 Rf8e8 Rh4xh7 d5d4 Bc5xd4+ e6e5 Bd4e3 Re8h8 Be3g5+ Kf6e6 Rg3h3 Rh8xh7 Rh3xh7 Bb7f3 Rh7h3

15/34+ 00:13 16.840.744 1.266.507 +4,88 Qf3f6+ Be7xf6
15/40 00:15 19.750.770 1.295.132 +4,94 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Rh4xh7 d5d4 Nc3a4 Rf8c8 Na4b6 Rc8d8 Ke1d2 Bb7e4 Nb6c4 g6g5 Rh7h5

16/40 00:18 24.820.463 1.337.165 +5,07 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7g8 Bh6xf8 Ra8xf8 Nc3a4 Bb7c6 Na4xc5 a6a5 Ke1d2 Rf8c8 Nc5d3 Bc6b5 Rg3g1 Kg8g7 Nd3e5 f7f6

17/40+ 00:23 31.381.579 1.340.749 +5,32 Qf3f6+ Be7xf6
17/42 00:27 37.443.169 1.378.005 +5,36 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 Rf3e3

18/46 00:38 55.764.625 1.445.503 +5,35 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 d5d4

19/51 01:03 91.048.677 1.445.584 +5,38 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 Bc6b5 Rf3e3
19/52 02:00 171.131.794 1.420.923 +5,38 Qf3f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3g5+ Kf6g7 Bg5h6+ Kg7f6 Bh6xf8 Ra8xf8 Nc3a4 Rf8c8 Rg3c3 c5c4 Rh4xh7 c4xb3 Rc3xb3 Bb7c6 Na4b6 Rc8f8 Rb3f3+ Kf6e7 Rh7g7 a6a5 b2b3 Bc6b5 Rf3e3

I stopped the analysis after two minutes; Qf6+ was found in only 6719 ms in my slow computer!

Regards from Spain.

Ajedrecista.

WOW!

[Terry McCracken]

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

FEN: r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

Houdini_15a_x64:
4/13 00:00 1,554 1,554,000 +0.26 Rg3-h3 Rf8-h8 Ke1-f1 Be7xg5 Be3xg5 Qd8xg5
5/17 00:00 2,848 2,848,000 +0.15 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-f4 Qd8-c7 Rf4xf7 Qc7xe5
6/17 00:00 4,840 968,000 +0.19 Rg3-h3 Rf8-h8 Ke1-f1 h7-h5 g5xh6/ep+ Kg7-f8 Rh4-g4
7/17 00:00 9,866 1,096,000 0.00 Rg3-h3 Rf8-h8 Rh4-f4 Qd8-f8 Rf4-h4 Qf8-d8 Rh4-f4
8/17+ 00:00 10,983 998,000 +0.06 Rg3-h3
8/17+ 00:00 11,660 832,000 +0.19 Rg3-h3
8/20 00:00 14,603 912,000 +0.09 Rg3-h3 Rf8-h8 Rh4-f4 Qd8-g8 Rf4-f6 Qg8-f8 b3-b4 c5xb4
9/20 00:00 34,889 153,000 0.00 Rg3-h3 Rf8-h8 Rh4-f4 Rh8-f8 Rf4-h4 Rf8-h8
10/22- 00:00 56,076 236,000 -0.06 Rg3-h3 Rf8-h8
10/22- 00:00 76,956 312,000 -0.19 Rg3-h3 Rf8-h8
10/23- 00:00 103,394 402,000 -0.47 Rg3-h3 Rf8-h8
10/30 00:00 354,313 1,139,000 -0.20 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Qd8-c7 Be3-f4 c5-c4 b3xc4 d5xc4 Nc3-e4 Ra8-b8 Ke1-f1 Bb7xe4 Qf3xe4 Rb8xb2 Bf4-e3 Rf8-d8 Kf1-g1 Rd8-d1+ Kg1-g2
11/30 00:00 478,682 1,433,000 -0.19 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-c7 Qf3-g3 c5-c4 b3xc4 d5xc4 Bd2-g5 Be7xg5 Rg4xg5 Bb7-c6 Qg3-f4 Qc7-e7 Rh3-g3 Rb8xb2 Qf4xc4
12/31- 00:00 632,630 1,737,000 -0.25 Rg3-h3 h7-h5
12/31+ 00:00 942,797 2,339,000 -0.12 Qf3-f4
12/31+ 00:00 989,894 2,402,000 0.00 Qf3-f4
12/31- 00:00 1,070,130 2,517,000 -0.25 Qf3-f4 h7-h5
12/31- 00:00 1,249,000 2,715,000 -0.38 Qf3-f4 h7-h5
12/32 00:00 1,308,928 2,749,000 -0.25 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-a5 Ke1-f1 Qa5-a1+ Kf1-g2 Qa1xb2 Qf3-d1 c5-c4 b3xc4 d5xc4+ f2-f3 Rf8-c8 Rg4-d4
13/35+ 00:00 1,523,203 2,986,000 -0.18 Rg3-h3
13/35 00:00 1,629,391 3,103,000 -0.30 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-a5 Qf3-e2 Bb7-c6 Rh3-d3 d5-d4 Nc3-e4 Qa5-a2 Bd2-g5 Be7xg5 Rg4xg5 Qa2xb2 Rd3-d1 Bc6xe4 Qe2xe4
14/36+ 00:00 2,540,816 3,849,000 -0.23 Rg3-h3
14/36+ 00:00 3,526,938 4,447,000 -0.11 Rg3-h3
14/40- 00:00 4,807,986 4,982,000 -0.36 Rg3-h3 h7-h5
14/48 00:01 11,018,930 6,292,000 -0.26 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-c7 Qf3-e2 Bb7-c6 Rh3-g3 Rb8-b4 f2-f4 Rb4-b8 Ke1-f1 d5-d4 Nc3-e4 Bc6-b5 Rg3-d3 Bb5xd3 Qe2xd3 Qc7-c6 Kf1-g2
15/48 00:01 11,291,995 6,329,000 -0.26 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-c7 Qf3-e2 Bb7-c6 Rh3-g3 Rb8-b4 f2-f4 Rb4-b8 Ke1-f1 d5-d4 Nc3-e4 Bc6-b5 Rg3-d3 Bb5xd3 Qe2xd3 Qc7-c6 Kf1-g2
16/48- 00:02 15,114,925 6,873,000 -0.33 Rg3-h3 h7-h5
16/48 00:02 19,746,698 7,343,000 -0.29 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-c7 Qf3-e2 Bb7-c6 Rh3-g3 Rb8-b4 f2-f4 Qc7-b6 Ke1-d1 c5-c4 Nc3-a2 Rb4-b5 Na2-c3 Rb5-a5
17/48 00:02 22,383,023 7,533,000 -0.23 Rg3-h3 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Ra8-b8 Be3-d2 Qd8-c7 Qf3-e2 Bb7-c6 Rh3-g3 Rb8-b4 f2-f4 Rb4-b8 Ke1-f2 c5-c4 b3xc4 Be7-c5+ Kf2-g2 d5xc4+ Nc3-e4 Qc7-b7 Kg2-f3 Qb7xb2 Qe2xc4
17/48+ 00:04 34,082,465 8,266,000 -0.23 Ke1-f1
17/48 00:05 49,074,830 8,749,000 -0.26 Ke1-f1 Ra8-b8 Be3-c1 Qd8-c7 Qf3-f4 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-h3 a6-a5 Rg3-g1 Qc7-c6 Rg1-g4 d5-d4 Nc3-e4 c5-c4 Qf4-d2 c4xb3 Rh3xb3 Bb7-a6+ Kf1-g2 Rb8xb3 c2xb3
18/48- 00:07 65,212,610 9,023,000 -0.33 Ke1-f1 Ra8-b8
18/51+ 00:12 116,316,825 9,375,000 -0.20 Be3-c1
18/51- 00:13 125,102,770 9,402,000 -0.33 Be3-c1 Qd8-c7
18/51 00:14 132,784,327 9,416,000 -0.41 Be3-c1 Qd8-c7 Qf3-f4 Rf8-h8 Ke1-f1 Kg7-g8 Rg3-h3 h7-h5 Rh3-d3 Rh8-h7 Kf1-g1 Rh7-g7 Rd3-d1 Ra8-e8 Rd1-e1 Bb7-c6 Bc1-d2 Re8-d8 Re1-a1
18/51 00:25 246,976,131 9,509,000 -0.22 Be3-d2 Qd8-c7 Qf3-f4 h7-h5 g5xh6/ep+ Kg7-h8 Rh4-g4 Bb7-c6 Nc3-a4 Bc6-e8 Na4-c3 Ra8-b8 Nc3-e2 Be8-c6 Ke1-f1 d5-d4 Kf1-g1 a6-a5 Ne2-c1 a5-a4 Rg3-d3 Bc6-d5 Bd2-e1 a4xb3 Nc1xb3 c5-c4
19/51- 00:26 255,395,168 9,505,000 -0.29 Be3-d2 Qd8-c7
19/51- 00:29 279,279,840 9,538,000 -0.41 Be3-d2 Qd8-c7
19/51 00:31 305,810,816 9,589,000 -0.39 Ke1-f1 Ra8-b8 Be3-c1 Bb7-a8 Qf3-e2 Rb8-b4 Rh4-h6 Rf8-h8 Bc1-d2 c5-c4 b3xc4 Rb4xb2 c4xd5 Ba8xd5 Bd2-c1 Rb2-b4 Kf1-g1 Bd5-b7 Bc1-a3 Rb4-d4 Ba3xe7 Qd8xe7 Rg3-g4
20/51+ 00:38 370,463,095 9,707,000 -0.33 Ke1-f1
20/51 00:45 453,162,373 9,861,000 -0.31 Ke1-f1 Rf8-h8 Rh4-f4 Ra8-b8 Be3-d2 Rh8-f8 Rf4-h4 Bb7-a8 Qf3-e2 Rf8-e8 Rh4-h6 Re8-h8 Kf1-g1 Qd8-c7 Rh6-h4 Rb8-b4 Bd2-f4 c5-c4 Rg3-h3 c4xb3 c2xb3 h7-h5
21/51 00:54 548,661,583 9,998,000 -0.33 Ke1-f1 Rf8-h8 Nc3-a4 Ra8-c8 Rh4-f4 Qd8-e8 Na4-c3 Bb7-a8 Be3-c1 c5-c4 Qf3-g4 c4xb3 c2xb3 d5-d4 Rf4xd4 Qe8-c6 Qg4-h3 Qc6-h1+ Rg3-g1 Qh1-b7 Rd4-c4 Rc8-c5 Qh3-h4 Rc5xe5 Bc1-e3 Re5-a5 Qh4-h6+ Kg7-g8 Nc3-e4 Qb7-d7 Kf1-g2
21/51+ 00:57 575,630,658 10,020,000 -0.25 Qf3-f4
21/51+ 00:59 593,967,104 10,024,000 -0.12 Qf3-f4
21/54 01:09 697,192,303 10,041,000 -0.21 Qf3-f4 Rf8-h8 Rg3-f3 Qd8-e8 Be3-d2 Bb7-c6 Rh4-h6 Kg7-g8 Ke1-f1 Ra8-b8 Rf3-h3 Be7-f8 Rh6-h4 Rb8-b4 Qf4-g3 Rb4xh4 Rh3xh4
22/54- 01:21 832,837,961 10,166,000 -0.28 Qf3-f4 Rf8-h8
22/60+ 01:34 970,528,439 10,270,000 -0.15 Be3xc5
22/65+ 01:47 1,111,255,066 10,319,000 +0.25 Be3xc5
22/66 01:56 1,204,046,153 10,366,000 +0.46 Be3xc5 Be7xc5 Qf3-f6+ Kg7-g8 Rh4-h6 Qd8xf6 e5xf6 d5-d4 Rg3-h3 Bb7-g2 Rh3-h4 Bg2-f3 Rh6xh7 Bf3-h5 Rh7-g7+ Kg8-h8 Nc3-e4 Bc5-b4+ c2-c3 d4xc3 b2xc3 Ra8-d8 Rh4xh5+ g6xh5 c3xb4 Rd8-d4 f2-f3 e6-e5 Ke1-f2 h5-h4 Kf2-e2 h4-h3 Ke2-f2 Rd4-d8 Kf2-g3 Rd8-d3 Ne4-c5 Rd3-c3 Kg3xh3
23/66- 02:00 1,246,137,585 10,383,000 +0.39 Be3xc5 Be7xc5
23/66+ 02:16 1,436,211,438 10,525,000 +0.52 Be3xc5
23/68 02:23 1,512,431,269 10,564,000 +0.31 Be3xc5 Be7xc5 Qf3-f6+ Kg7-g8 Rh4-h6 Qd8xf6 e5xf6 d5-d4 Rg3-h3 Bb7-g2 Rh3-h4 Bg2-f3 Rh6xh7 Bf3-h5 Rh7-g7+ Kg8-h8 Nc3-e4 Rf8-c8 Rg7xf7 Ra8-a7 Rf7xa7 Bc5xa7 Ne4-g3 Kh8-h7 f2-f4 Rc8-h8 Ng3xh5 Kh7-g8 Ke1-d2 g6xh5 Kd2-d3 Kg8-f7 Kd3-e4 Kf7-g6 Rh4-h3 Rh8-b8 Rh3-d3 a6-a5 Rd3-h3 Rb8-f8 Ke4-e5
24/68+ 02:37 1,686,694,141 10,681,000 +0.38 Be3xc5
24/68 02:54 1,880,090,577 10,799,000 +0.44 Be3xc5 Be7xc5 Qf3-f6+ Kg7-g8 Rh4-h6 Qd8xf6 e5xf6 d5-d4 Rg3-h3 Bb7-g2 Rh3-h4 Bg2-f3 Rh6xh7 Bf3-h5 Rh7-g7+ Kg8-h8 Nc3-e4 Rf8-c8 Rg7xf7 Ra8-a7 Rf7xa7 Bc5xa7 Ne4-g3 Kh8-h7 f2-f4 Rc8-h8 Ng3xh5 Kh7-g8 Ke1-d2 g6xh5 Kd2-d3 Kg8-f7 Kd3-e4 Kf7-g6 Rh4-h3 Rh8-b8 Rh3-d3 Rb8-b4 h2-h4 Rb4-b8 Ke4-e5 Kg6-f7 c2-c4 a6-a5 f4-f5 e6xf5 Ke5xf5
25/68 03:16 2,140,862,679 10,916,000 +0.41 Be3xc5 Be7xc5 Qf3-f6+ Kg7-g8 Rh4-h6 Qd8xf6 e5xf6 d5-d4 Rg3-h3 Bb7-g2 Rh3-h4 Bg2-f3 Rh6xh7 Bf3-h5 Rh7-g7+ Kg8-h8 Nc3-e4 Rf8-c8 Rg7xf7 Ra8-a7 Rf7xa7 Bc5xa7 Ne4-g3 Kh8-h7 f2-f4 Rc8-h8 Ng3xh5 Kh7-g8 Ke1-d2 g6xh5 Kd2-d3 Kg8-f7 Rh4-h3 Kf7-g6 Kd3-e4 Rh8-b8 Ke4-e5 Rb8-b6 Rh3-d3 a6-a5 h2-h4 Rb6-c6 c2-c4 Kg6-f7 Ke5-e4 Rc6-c8 f4-f5 Rc8-e8 f5xe6+ Re8xe6+ Ke4-f5
25/68+ 03:34 2,355,274,402 10,995,000 +0.51 Qf3-f6+
25/69+ 03:48 2,510,374,233 10,968,000 +2.32 Qf3-f6+
25/74 06:16 4,185,823,803 11,127,000 +5.78 Qf3-f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3-g5+ Kf6-g7 Bg5-h6+ Kg7-f6 Bh6xf8 Ra8xf8 Rh4xh7 d5-d4 Nc3-a4 Rf8-c8 Na4-b6 Rc8-d8 Ke1-d2 e6-e5 Nb6-c4 Bb7-d5 Rg3-g1 a6-a5 Rg1-a1 Bd5xc4 b3xc4 Rd8-a8 Ra1-a3 Ra8-a7 Ra3-b3 a5-a4 Rb3-b5
26/74 06:44 4,522,558,977 11,178,000 +5.97 Qf3-f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3-g5+ Kf6-g7 Bg5-h6+ Kg7-g8 Bh6xf8 Ra8xf8 Nc3-a4 Bb7-c6 Na4xc5 Rf8-a8 Rg3-h3 h7-h5 b3-b4 e6-e5 Rh3-a3 Bc6-b5 f2-f4 e5-e4 Ke1-f2 Ra8-b8 Kf2-e3 Rb8-b6 Ra3-a1
27/74 07:51 5,355,493,894 11,365,000 +6.11 Qf3-f6+ Be7xf6 g5xf6+ Qd8xf6 e5xf6+ Kg7xf6 Be3-g5+ Kf6-g7 Bg5-h6+ Kg7-g8 Bh6xf8 Ra8xf8 Nc3-a4 Rf8-a8 Na4xc5 Bb7-c8 Ke1-d2 Kg8-g7 Rh4-a4 h7-h6 b3-b4 Ra8-b8 Kd2-c3 Rb8-b6 Kc3-d4 g6-g5 f2-f4 Kg7-f6 Rg3-f3 g5-g4

Sandy Bridge 2600 4 cores @3.5Ghz

[tttony]

wow Spark is good is this kind of play

I have tested only a few free engines and it takes so much time to found the move

It would be interesting to see the not free engines

[kgburcham]

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

CPU0: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU1: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU2: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU3: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU4: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU5: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
6 processor(s) found, POPCNT available

Houdini

24/59 2:22 -0.23++ 1.Qf6+ (2.321.253.218) 16314
24/59 2:27 -0.10++ 1.Qf6+ (2.398.398.613) 16293
24/59 2:44 +0.17++ 1.Qf6+ (2.672.284.807) 16276
24/64 4:24 +1.08++ 1.Qf6+ (4.322.509.830) 16353
24/64 4:27 +1.08 1.Qf6+ Bxf6 2.gxf6+ Kg8 3.Bxc5 Re8 (4.372.821.339) 16366

Rybka

19.20 0:40 -0.28++ 1.Qf6+ Bxf6 2.gxf6+ (27.828.681) 682
19.01 0:40 -0.13++ 1.Qf6+ Bxf6 2.gxf6+ (27.898.661) 681
19.01 0:44 +0.27++ 1.Qf6+ Bxf6 2.gxf6+ (29.182.709) 662
19.01 1:00 +1.07++ 1.Qf6+ Bxf6 2.gxf6+ (36.083.877) 593
19.01 1:14 +1.07++ 1.Qf6+ Bxf6 2.gxf6+ (41.666.560) 563

[royb]

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

CPU0: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU1: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU2: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU3: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU4: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
CPU5: GenuineIntel Intel64 Family 6 Model 44 Stepping 2 3373 MHz
6 processor(s) found, POPCNT available

Houdini

24/59 2:22 -0.23++ 1.Qf6+ (2.321.253.218) 16314
24/59 2:27 -0.10++ 1.Qf6+ (2.398.398.613) 16293
24/59 2:44 +0.17++ 1.Qf6+ (2.672.284.807) 16276
24/64 4:24 +1.08++ 1.Qf6+ (4.322.509.830) 16353
24/64 4:27 +1.08 1.Qf6+ Bxf6 2.gxf6+ Kg8 3.Bxc5 Re8 (4.372.821.339) 16366

Rybka

19.20 0:40 -0.28++ 1.Qf6+ Bxf6 2.gxf6+ (27.828.681) 682
19.01 0:40 -0.13++ 1.Qf6+ Bxf6 2.gxf6+ (27.898.661) 681
19.01 0:44 +0.27++ 1.Qf6+ Bxf6 2.gxf6+ (29.182.709) 662
19.01 1:00 +1.07++ 1.Qf6+ Bxf6 2.gxf6+ (36.083.877) 593
19.01 1:14 +1.07++ 1.Qf6+ Bxf6 2.gxf6+ (41.666.560) 563

Komodo5 does pretty well with this one (2.3 GHz i7 CPU):

<snip>
18 -0.62 19.Bd2 Rb8 20.Qf4 Rh8 21.Rf3 Qe8 22.Kf1 Bc6 23.Qg3 Kg8 24.Rhf4 c4 25.Ne2 d4 26.Nxd4 Bxf3 27.Rxf3 cxb3 28.Rxb3 Kg7 29.Qh4 Rxb3 30.Qh6+ Kg8 (16.40)
19 -0.73 19.Bd2 Rh8 20.Qf4 Bc6 21.Rf3 Qe8 22.Kf1 Kg8 23.Kg1 Rb8 24.Rfh3 Rb4 25.Qg3 Rxh4 26.Rxh4 Qb8 27.Qf4 Kg7 28.Rh6 Qb4 29.Qf3 Qd4 (33.53)
20 -0.76 19.Bd2 Rh8 20.Qf4 Bc6 21.Rf3 Qe8 22.Kf1 Kg8 23.Kg1 Rb8 24.Rfh3 Rb4 25.Qf3 Rxh4 26.Rxh4 Qb8 27.Bf4 Kg7 28.Rh6 Qb7 29.Qd3 d4 30.Ne2 (47.81)
20 -0.57 19.Rxh7+ (58.67)
20 -0.26 19.Rxh7+ Kxh7 20.Rh3+ Kg8 21.Qf4 Bxg5 22.Qxg5 Qxg5 23.Bxg5 f5 24.Na4 Rf7 25.Nxc5 Bc8 26.Kd2 Rc7 27.b4 Rh7 28.Rxh7 Kxh7 29.h4 Kg7 30.b3 Rb8 31.c3 Rb5 32.Bd8 d4 33.c4 Rxb4 34.Kd3 Kf7 35.Ba5 (62.83)
20 -0.10 19.Qf6+ (69.12)
20 +0.61 19.Qf6+ (75.84)
20 +1.68 19.Qf6+ (77.38)
20 +3.29 19.Qf6+ (81.01)
20 +3.88 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Bc6 29.Rg1 Rb7 30.Nc4 Bd5 31.Kd3 e5 32.Nd6 Rb6 33.Ne4+ Bxe4+ 34.Kxe4 Ke6 (100.02)
21 +3.89 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.Rh8 Kf5 30.Nc4 Bd5 31.Nd6+ Ke5 32.Rd8 a5 33.Nb5 Rc6 34.Ra8 Kf4 35.Ra7 (108.22)
22 +4.02 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.h4 e5 30.Nc4 Bd5 31.h5 Rb7 32.hxg6 fxg6 33.Rxb7 Bxb7 34.Nd6 Bc6 35.Kd3 Bb5+ 36.Nc4 Bc6 37.f3 (118.70)
23 +4.03 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.h4 Bc6 30.Kd3 e5 31.h5 gxh5 32.Rxh5 Ke6 33.Rg7 Rb7 34.Rh6+ f6 35.Rxb7 Bxb7 36.Na4 Kd5 37.Rxf6 e4+ 38.Ke2 c4 39.Nb6+ Ke5 40.Nd7+ Kd5 (135.17)
24 +4.10 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.h4 Bc6 30.Kd3 e5 31.h5 gxh5 32.Rxh5 Ke6 33.Rg7 Re7 34.Rh6+ f6 35.Rxe7+ Kxe7 36.Kc4 Ke6 37.Kxc5 Be4 38.c4 d3 39.Nd5 Bxd5 40.cxd5+ Kf5 (166.83)
25 +4.10 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.h4 Bc6 30.Kd3 e5 31.h5 gxh5 32.Rxh5 Ke6 33.Rg7 Re7 34.Rh6+ f6 35.Rxe7+ Kxe7 36.Kc4 Ke6 37.Kxc5 Be4 38.c4 d3 39.Nd5 Bxd5 (204.44)
26 +4.10 19.Qf6+ Bxf6 20.gxf6+ Qxf6 21.exf6+ Kxf6 22.Bg5+ Kg7 23.Bh6+ Kf6 24.Bxf8 Rxf8 25.Na4 Rc8 26.Rxh7 d4 27.Nb6 Rc7 28.Kd2 Be4 29.h4 Bc6 30.Kd3 e5 31.h5 gxh5 32.Rxh5 Ke6 33.Rg7 Re7 34.Rh6+ f6 35.Rxe7+ Kxe7 36.Kc4 Ke6 37.Kxc5 Be4 38.c4 d3 39.Nd5 Bxd5 (282.49)
27 +4.26 19.Qf6+ (393.25)
27 +4.25 19.Qf6+ Bxf6 (472.77)

[Daniel White]

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

Is anyone able to explain how white proceeds after 1. Qf6+ Bxf6 2. gxf6+ Kg8 ?

[Ajedrecista]

Hello Daniel:

[d] r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - 4 19

What say your engine?

Is anyone able to explain how white proceeds after 1. Qf6+ Bxf6 2. gxf6+ Kg8 ?

Of course: Houdini thinks that this variation ends with a mate in eight:

Rxh7, Kxh7; Rh3+, Kg8; Ah6, Qc7; f4 (defending e5), Qa5; Bg7, Qa1+; Kf2, Qf1+; Kxf1, Rfe8; Rh8#.

If Qf6+, Kg8 then the same idea applies if we trust Spark and its line of mate in ine after Kg8:

Rxh7, Bxf6 (not Kxh7?; Rh3+, Kg8 (only move); Rh8#); gxf6, Kxh7; Rh3+, Kg8; Ah6, Qc7; f4 (defending e5), Qa5; Bg7, Qa1+; Kf2, Qe1+; Kxe1, Rfb8; Rh8#.

If you take a look, you will see that all the plans for white are the same after Qf6+: rook sacrifice on h7 square, rook check in h3, Qc7 for black aiming for Qe5+ with advantage for black (avoiding the checkmate plan by white), f4 for defending white pawn on e5, then some checks by the black queen while white plays Bh6, Bg7, Rh8# due to the black king is trapped by its own pieces.

I hope that my explanation is clear enough. Please ask again if you have more doubts: someone will kindly answer you.

Regards from Spain.

Ajedrecista.