Difficult Test Position: Nxh7!!!

[swami]

[d] 1b2b1k1/1p2qppp/pn2p3/3nP1N1/1P5P/P4NP1/1B2QPB1/6K1 w - - 0 1

Solution: Nxh7 !!

Sacrifice the knight to make way for the queen, by giving tempo with the other knight en route.

What's the time taken?

[TSP]

Rybka 3 took 45 seconds to find the move on my Quad 6700.

FEN: 1b2b1k1/1p2qppp/pn2p3/3nP1N1/1P5P/P4NP1/1B2QPB1/6K1 w - - 0 1

Rybka 3:
10 00:00 60.273 171.443 +0.44 Qe2c2 g7g6 Ng5e4 Be8b5 Nf3d2 Qe7d7 Bb2d4
11 00:01 103.550 178.510 +0.35 Qe2c2 g7g6 Ng5e4 Be8b5 Nf3d2 Qe7d7 Bb2d4 Qd7c8
12 00:01 184.370 188.983 +0.43 Qe2c2 g7g6 Ng5e4 Be8b5 Nf3d2 Bb5a4 Qc2c1 Ba4b5 Bb2d4
13 00:02 316.271 193.929 +0.36 Qe2c2 g7g6 Ng5e4 Be8b5 Nf3d2 Qe7d8 Bb2d4 Nb6d7 f2f4 Nd7b6
14 00:03 619.612 194.566 +0.41 Qe2c2 g7g6 Ng5e4 Be8c6 Nf3d2 Qe7d8 Bb2d4 Nb6c8 Nd2f3 Nc8e7 Bd4c5
15 00:07 1.358.114 197.628 +0.36 Qe2c2 g7g6 Ng5e4 Be8c6 Nf3d4 Bc6a4 Nd4b3
16 00:12 2.301.225 196.929 +0.40 Qe2c2 g7g6 Ng5e4 Be8c6 Nf3d2 Qe7d8 Qc2c1 Bc6b5 Ne4f6+ Nd5xf6 e5xf6 e6e5 Bg2xb7 Qd8xf6 Nd2e4 Qf6f3
17 00:27 5.484.700 207.858 +0.41 Qe2c2 g7g6 Ng5e4 Qe7d8 h4h5 Be8a4 Qc2c1 Qd8c8 Qc1xc8+ Nb6xc8 h5xg6 h7xg6 Nf3g5 Ba4c6 Bb2d4 Bc6b5 f2f4
17+ 00:45 8.490.658 191.389 +0.60 Ng5xh7
17+ 01:34 16.891.487 183.811 +0.80 Ng5xh7
17 02:43 29.001.169 182.586 +0.79 Ng5xh7 Qe7c7 Nh7g5 Nb6c4 Kg1h2 Nc4xb2 Qe2xb2 Nd5e7 Qb2d2 Ne7f5 Bg2f1 Nf5e7 h4h5 Ne7f5 Bf1d3

[Chris Taylor]

Not for Prodeo/Rebel based on 1.2 with Q3 personality...Picks it up in one second...........


New game
1b2b1k1/1p2qppp/pn2p3/3nP1N1/1P5P/P4NP1/1B2QPB1/6K1 w - - 0 1

Analysis by Pro Deo 1.2 Q3:AMD 3200

1.Nxh7 Qc7 2.Nhg5 Qc4
+/- (0.71) Depth: 5 00:00:01
+/- (1.40) Depth: 14 00:04:37 334mN

(Taylor, 11.09.2008)

[kgburcham]

[d] 1b2b1k1/1p2qppp/pn2p3/3nP1N1/1P5P/P4NP1/1B2QPB1/6K1 w - -

15/51 0:21 +0.75++ 1.Nxh7 (85.595.207) 3965
15/53 1:02 +0.85 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Bxf3 7.Bxf3 Qxe5 8.Qxe5 Bxe5 9.Bxd5 exd5 10.Nxb7 Bb2 11.Nc5 Bxa3 12.Nxa6 (237.619.793) 3821
16/53 1:07 +0.85 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Bxf3 7.Bxf3 Qxe5 8.Qxe5 Bxe5 9.Bxd5 exd5 10.Nxb7 Bb2 11.Nc5 Bxa3 12.Nxa6 (258.474.607) 3817
17/58 1:29 +0.81 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Ba7 7.Qd4 Be2 8.Nh4 Bxc5 9.bxc5 Qd7 10.Bf3 Bxf3 11.Nxf3 (342.542.544) 3823

[swami]

15/51 0:21 +0.75++ 1.Nxh7 (85.595.207) 3965
15/53 1:02 +0.85 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Bxf3 7.Bxf3 Qxe5 8.Qxe5 Bxe5 9.Bxd5 exd5 10.Nxb7 Bb2 11.Nc5 Bxa3 12.Nxa6 (237.619.793) 3821
16/53 1:07 +0.85 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Bxf3 7.Bxf3 Qxe5 8.Qxe5 Bxe5 9.Bxd5 exd5 10.Nxb7 Bb2 11.Nc5 Bxa3 12.Nxa6 (258.474.607) 3817
17/58 1:29 +0.81 1.Nxh7 Qc7 2.Nhg5 Nc4 3.h5 Nxb2 4.Qxb2 Ba4 5.Ne4 Bd1 6.Nc5 Ba7 7.Qd4 Be2 8.Nh4 Bxc5 9.bxc5 Qd7 10.Bf3 Bxf3 11.Nxf3 (342.542.544) 3823

Which engine is this?

[kgburcham]

[d] 1b2b1k1/1p2qppp/pn2p3/3nP1N1/1P5P/P4NP1/1B2QPB1/6K1 w - -

Deep Sjeng 3.0

14/44 0:09 +0.70++ 1.Nxh7 (39.062.379) 4019
14/49 0:27 +0.70 1.Nxh7 Qc7 2.Nhg5 Nc4 3.Bf1 Nxb2 4.Qxb2 Qc3 5.Qxc3 Nxc3 6.h5 Ba7 7.Bd3 Bc6 8.Bc2 Kf8 9.Kf1 Ke7 10.Kg2 (104.499.920) 3871
15/49 0:27 +0.70 1.Nxh7 Qc7 2.Nhg5 Nc4 3.Bf1 Nxb2 4.Qxb2 Qc3 5.Qxc3 Nxc3 6.h5 Ba7 7.Bd3 Bc6 8.Bc2 Kf8 9.Kf1 Ke7 10.Kg2 (106.799.633) 3871
16/53 0:43 +1.08 1.Nxh7 Qc7 2.Nhg5 Qc4 3.Qd2 Qa2 4.Qc2 g6 5.Bf1 Ba4 6.Qc1 Bb5 7.Bxb5 axb5 8.Nd2 Nc4 9.Nxc4 bxc4 10.Ne4 Qb3 11.Nd6 c3 (166.882.125) 3843
17/56 2:08 +1.23 1.Nxh7 Qc7 2.Nhg5 Qc4 3.Qd2 Na4 4.Bf1 Qb3 5.Qc1 Ndc3 6.Bxc3 Qxc3 7.Qb1 Bxe5 8.Qe4 Bf6 9.Qxb7 Qc6 10.Qxa6 Qxa6 11.Bxa6 Bc6 12.Bd3 Nc3 13.h5 Bxf3 14.Nxf3 (495.903.618) 3860

[meschle]

I am glad some engines are better than rybka with this one - so thanks good test position

Glaurung 2.1 took 1 sec

Glaurung 2.1:
2 00:00 109 694 -0.33 Qe2d3 f7f5
2 00:00 377 2.191 -0.19 Nf3d4 Be8a4
3 00:00 1.006 5.848 -0.41 Nf3d4 h7h6 Ng5f3
3 00:00 1.363 7.924 +0.21 Qe2d3 g7g6 Nf3d2
4 00:00 1.921 10.218 +0.13 Qe2d3 g7g6 Nf3d2 f7f5
5 00:00 3.548 18.872 -0.15 Qe2d3 g7g6 Nf3d2 Be8b5 Qd3f3
5 00:00 6.483 31.779 +0.31 Qe2e4 g7g6 Bg2f1 Be8a4 Bf1d3
6 00:00 10.771 52.799 +0.09 Qe2e4 g7g6 Bb2d4 Be8b5 Bd4xb6 Nd5xb6 Nf3d4
7 00:00 20.565 87.510 +0.27 Qe2e4 g7g6 Bb2d4 Nb6d7 Qe4c2 Bb8c7 Bg2f1
8 00:00 46.905 166.329 -0.31 Qe2e4 g7g6 Qe4c2 Be8a4 Qc2c1 Bb8c7 Bb2d4 Ba4b5
8 00:00 66.257 201.389 +0.09 Qe2c2 f7f5 Nf3d4 Be8d7 Qc2d3 g7g6 f2f4 Bb8c7
9 00:00 107.174 263.326 -0.03 Qe2c2 f7f5 Nf3d4 Be8d7 Qc2d3 g7g6 f2f4 Bb8c7 Bg2f3
10 00:00 217.916 339.962 +0.07 Qe2c2 g7g6 Bb2d4 Be8a4 Qc2c1 Bb8c7 Bd4c5 Qe7e8 Ng5e4 Ba4b5
11 00:00 345.914 388.231 0.00 Qe2c2 g7g6 Bb2d4 Be8a4 Qc2c1 Bb8c7 Ng5e4 Nb6d7 Bg2f1 Qe7f8 Bf1d3
11 00:01 774.684 446.503 +0.31 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7c7 Bg2e4 Qc7d7 Qh5h7+ Kg8f8 Bb2d4 Nb6a4 Qh7h8+ Kf8e7 Qh8xg7 Ke7d8
12 00:02 1.135.372 459.850 +0.37 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7c7 Bg2e4 Qc7d7 Qh5h7+ Kg8f8 Bb2d4 Nb6a4 Qh7h8+ Kf8e7 Qh8xg7 Ke7d8 Qg7f8
13 00:03 1.753.194 477.449 +0.03 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7c7 Bg2e4 Qc7d7 Bb2d4 Nb6a4 Qh5h7+ Kg8f8 Be4c2 Qd7c6 Qh7h8+ Kf8e7 Bc2e4 Ke7d8 Qh8xg7
14 00:09 4.646.488 507.424 +0.27 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7c7 Bg2e4 Qc7d7 Bb2d4 Nb6a4 Qh5h7+ Kg8f8 Be4c2 Kf8e7 Qh7xg7 Ke7d8 Qg7f8
15 00:19 10.226.462 540.453 +0.45 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7d7 Qh5h7+ Kg8f8 Bb2d4 Nb6a4 h4h5 Qd7c7 Qh7h8+ Kf8e7 Qh8xg7 Na4c3 Kg1h2 Qc7c4 Bd4c5+ Ke7d8 Ng5xf7+ Kd8c8
16 00:46 26.203.332 570.791 +0.72 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7d7 Qh5h7+ Kg8f8 Bb2d4 Nb6a4 h4h5 Qd7c7 Qh7h8+ Kf8e7 Qh8xg7 Na4c3 Kg1h2 Nc3b5 Bd4c5+ Ke7d8 Bg2xd5 e6xd5 e5e6 Nb5xa3 e6xf7
17 01:39 58.528.629 587.489 +0.96 Ng5xh7 Kg8xh7 Nf3g5+ Kh7g8 Qe2h5 Qe7d7 Bb2d4 Nb6a4 Qh5h7+ Kg8f8 h4h5 Kf8e7 Qh7xg7 Na4c3 Bd4xc3 Nd5xc3 Qg7f6+ Ke7f8 h5h6 Qd7d1+ Kg1h2 Qd1h5+ Bg2h3 Qh5g6 Qf6h8+ Kf8e7 f2f4

[swami]

I am glad some engines are better than rybka with this one - so thanks good test position

You're Welcome.