Test Position: Rxd2!!

[swami]

[D]3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Does your engine find Rxd2? How long does it take?

Solution: Rxd2 with huge advantage for black.

Difficulty: Tough

Hint: the idea is to outpost the knight, divert the active opponents bishop and attack the white kingside with two advanced knights.

[Ovyron]

Bright 0.3a finds the move in 43 seconds, but doesn't give a "huge" advantage for black under reasonable time:

1/04 0:00 +0.30 1...Nxg5 2.fxg4 Nxg4 (12) 0
1/07 0:00 -0.61 1...Qxg5 2.fxg4 Rxd2 3.Bxd2 Rxd2 (43) 0
2/13 0:00 -0.61 1...Qxg5 2.fxg4 Rxd2 3.Bxd2 Rxd2 (249) 0
3/13 0:00 -0.61 1...Qxg5 2.fxg4 Rxd2 3.Bxd2 Rxd2 (690) 0
4/14 0:00 +0.26 1...Qxg5 2.Nc4 Bxf3 3.Bxf3 Qxg3+ 4.Qg2 (2.795) 0
5/19 0:00 +0.26 1...Qxg5 2.Nc4 Bxf3 3.Bxf3 Qxg3+ 4.Qg2 (8.158) 0
6/19 0:00 -0.01 1...Qxg5 2.Nc4 Rd4 3.Bxd4 Nxd4 4.Qf2 Be6 (29.026) 0
7/19 0:00 0.00 1...Qxg5 2.Nc4 Rd4 3.Ne3 Bh5 4.Bxd4 Nxd4 (55.287) 0
8/29 0:00 +0.45 1...Qxg5 2.Nc4 Rd4 3.Nd6 Bxf3 4.Bxf3 Qxg3+ 5.Qg2 Qxg2+ 6.Kxg2 (134.829) 0
8/29 0:00 +0.19 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Rd3 4.Red1 Nf2 5.Rd2 Rxd2 6.Nxd2 (218.453) 0
9/29 0:00 +0.40 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Rd3 4.Red1 Nf2 5.Rxd3 Nxd3 6.Ne3 a6 (409.396) 0
10/29 0:01 +0.40 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Rd3 4.Red1 Nf2 5.Rxd3 Nxd3 6.Ne3 a6 (977.171) 0
11/35 0:02 +0.69 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Ne6 4.Ne3 Qh2+ 5.Kf1 Qxg3 6.Nxg4 Qxg4 7.Qf2 Nd4 8.Red1 a6 (2.266.665) 0
12/35 0:08 +0.95 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Ne6 4.a5 Nd4 5.Bxd4 Rxd4 6.Red1 Qg5 7.Bf3 Nf6 8.Qe2 h6 (7.330.503) 0
12/35 0:10 +0.44 1...Qxg5 2.Nc4 Rd4 3.Bxd4 Nxd4 4.Qf2 Be6 5.f4 exf4 6.gxf4 Qh6 7.Nd6 Nb3 8.Rad1 Ng4 (9.303.042) 0
13/40 0:17 +0.44 1...Qxg5 2.Nc4 Rd4 3.Bxd4 Nxd4 4.Qf2 Be6 5.f4 exf4 6.gxf4 Qh6 7.Nd6 Nb3 8.Rad1 Ng4 (14.768.449) 0
14/41 0:29 +0.44 1...Qxg5 2.Nc4 Rd4 3.Bxd4 Nxd4 4.Qf2 Be6 5.f4 exf4 6.gxf4 Qh6 7.Nd6 Nb3 8.Rad1 Ng4 9.Qg3 b6 (26.148.441) 0
14/41 0:43 +0.03 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qd3 f6 5.gxf6 Rf8 6.Bf4 Rxf6 7.Ra3 g5 8.Qc4+ Kh8 9.Rd3 Qh2+ 10.Kf1 gxf4 (38.012.859) 0
15/49 1:02 -0.17 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qd3 f6 5.gxf6 Rf8 6.Bf4 Rxf6 7.Ra2 Qh2+ 8.Kf1 exf4 9.e5 Rf7 10.e6 Rf8 (54.271.099) 0
16/54 1:49 -0.26 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qc3 f6 5.Be3 fxg5 6.Ra2 Qh2+ 7.Kf1 Qxg3 8.Rf2 Nxf2 9.Qc4+ Kh8 10.Bxf2 Rf8 11.Qa2 Qh2 (94.488.845) 0
17/54 3:26 -0.59 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qc3 f6 5.gxf6 Rf8 6.Bf4 Qh2+ 7.Kf1 Rxf6 8.Rad1 exf4 9.Rxd4 fxg3+ 10.Ke2 Qxg2+ 11.Kd1 h5 12.Rd7 h4 13.Qc4+ Kh8 14.Rxb7 (170.385.112) 0
18/54 6:04 -0.59 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qc3 f6 5.gxf6 Rf8 6.Bf4 Qh2+ 7.Kf1 Rxf6 8.Rad1 exf4 9.Rxd4 fxg3+ 10.Ke2 Qxg2+ 11.Kd1 h5 12.Rd7 h4 13.Qc4+ Kh8 14.Rxb7 (288.897.932) 0 (Analysis stopped.)

[jpqy]

Bright-0.3a need only 2sec to find the right move on a Q6600 @3.6Ghz!

FEN: 3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Bright-0.3a:
13/38 00:02 18.215.855 8.038 -0,80 Qh5xg5 Nd2c4 Bg4xf3 Bg2xf3 Rd7d3 Bf3g2 Nf6g4 Ra1d1 Rd3xg3 Rd1xd8+ Qg5xd8 Re1d1 Qd8f6 Rd1d7 Ne6g5
13/38 00:02 23.629.821 8.173 -0,03 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2d3 f7f6 g5xf6 Rd8f8 Bd2f4 Rf8xf6 Ra1a3 g6g5 Qd3c4+ Kg8h8 Ra3d3 Qh5h2+ Kg1f1 g5xf4
14/42 00:03 28.419.703 8.082 -0,03 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2d3 f7f6 g5xf6 Rd8f8 Bd2f4 Rf8xf6 Ra1a3 g6g5 Qd3c4+ Kg8h8 Ra3d3 Qh5h2+ Kg1f1 g5xf4
15/48 00:06 52.017.832 8.120 +0,17 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2d3 f7f6 g5xf6 Rd8f8 Bd2f4 Rf8xf6 Ra1a2 Qh5h2+ Kg1f1 e5xf4 e4e5 Rf6f7 e5e6 Rf7f8
16/48 00:10 85.601.544 8.275 +0,26 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2c3 f7f6 Bd2e3 Qh5h2+ Kg1f1 f6xg5 Ra1a2 Qh2xg3 Ra2f2 Ng4xf2 Qc3c4+ Kg8h8 Be3xf2 Rd8f8 Qc4a2 Qg3h2
17/51 00:20 170.241.437 8.192 +0,59 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2c3 f7f6 g5xf6 Qh5h2+ Kg1f1 Rd8f8 Bd2f4 Rf8xf6 Ra1d1 e5xf4 Rd1xd4 f4xg3+ Kf1e2 Qh2xg2+ Ke2d1 h7h5 Rd4d7 h5h4 Qc3c4+ Kg8h8 Rd7xb7
18/54 00:38 321.374.764 8.266 +0,70 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2c3 f7f6 g5xf6 Qh5h2+ Kg1f1 Rd8f8 Bd2f4 Rf8xf6 Ra1d1 e5xf4 Rd1xd4 f4f3 Rd4d8+ Kg8f7 Qc3xf6+ Kf7xf6 Rd8f8+ Kf6e5 Rf8xf3 a7a6
19/57 01:45 874.676.928 8.252 +1,10 Rd7xd2 Bc3xd2 Ne6d4 f3xg4 Nf6xg4 Qc2c3 f7f6 g5xf6 Rd8f8 Ra1d1 Rf8xf6 Bd2f4 e5xf4 Rd1xd4 f4f3 Rd4d8+ Kg8f7 Qc3xf6+ Ng4xf6 e4e5 f3xg2 e5xf6 Qh5h1+ Kg1f2 Kf7xf6

Jean-Paul.

[Ovyron]

If the time correlation continues it seems Bright would need at least 22 minutes to show the big evaluation on my computer.

[jpqy]

Glaurung 080420 goes further with Bg4h3 (Thanks Tord!!)

Glaurung_win32:
9 00:00 106.159 973.935 +0,11 Ne6xg5 f3xg4 Ng5h3+ Bg2xh3 Qh5xh3 Nd2f1 Nf6xg4 Ra1d1 f7f6 Rd1xd7 Rd8xd7 Re1d1
10 00:00 271.867 1.580.622 +0,09 Ne6xg5 f3xg4 Nf6xg4 Nd2f1 h7h6 Ra1d1 Ng4h2 Rd1xd7 Nh2f3+ Bg2xf3 Ng5xf3+ Kg1f2 Rd8xd7
10 00:00 348.159 1.851.909 +0,13 Qh5xg5 Nd2c4 Bg4xf3 Bg2xf3 Ne6d4 Bc3xd4 Rd7xd4 Kg1f1 Qg5xg3 Re1e3 Qg3h3+ Kf1g1
11 00:00 564.325 2.121.522 +0,17 Qh5xg5 Nd2c4 Bg4xf3 Bg2xf3 Ne6d4 Bc3xd4 Rd7xd4 Ra1d1 Qg5xg3+ Qc2g2 Qg3f4 Rd1c1 Rd4d3
12 00:00 1.296.820 2.765.074 -0,33 Qh5xg5 Nd2c4 Ne6d4 Bc3xd4 e5xd4 f3xg4 Nf6xg4 Qc2d2 Qg5xd2 Nc4xd2 Rd7e7 Bg2f3 Ng4e5 Kg1g2
12 00:00 1.762.348 2.893.839 -0,03 Ne6xg5 f3xg4 Nf6xg4 Nd2f1 h7h6 Ra1d1 Ng4h2 Rd1xd7 Nh2f3+ Bg2xf3 Ng5xf3+ Kg1f2 Rd8xd7 Re1d1
12 00:00 2.379.787 3.106.771 +0,03 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2g1 Rd7xd2 Re2xd2 Ng5xf3+ Kg1f2 Nf3xd2 Bc3xd2 Qh3h2+ Kf2e3 Qh2xg3+ Ke3e2
13 00:00 3.003.884 3.152.029 0,00 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1h2+
14 00:01 5.097.519 3.434.985 0,00 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Qh1h2+
15 00:03 12.931.216 3.849.721 +0,66 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2f2 Qh3h2+ Kf2f1 Qh2h1+ Kf1f2 Ng5h3+ Kf2e3 Nh3g1 Re2f2 Qh1h6+ f3f4 Ng1h3 Rf2f1 e5xf4+ g3xf4 Qh6h4 Bc3e5 Qh4g3+ Nd2f3
16 00:06 26.856.835 4.044.095 +1,19 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1f1 Qh5h3+ Kg2g1 Qh3xg3+ Kg1h1 Rd7d3 Ra1d1 Ng5xf3 Nd2xf3 Rd3xd1 Qc2g2 Rd1xf1+ Qg2xf1 Qg3f4 Bc3xe5 Qf4xe4
17 00:11 49.757.372 4.162.751 +1,27 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2g1 Rd7xd2 Re2xd2 Ng5xf3+ Kg1f2 Nf3xd2 Bc3xd2 Qh3h2+ Kf2e3 Qh2xg3+ Ke3e2 Qg3g2+ Ke2e3 h7h5 Ra1d1 Rd8d4 b4b5
18 00:19 82.104.018 4.268.691 +1,39 Bg4h3 g5xf6 Bh3xg2 Kg1xg2 Ne6g5 Re1e2 Qh5h3+ Kg2g1 Rd7xd2 Re2xd2 Ng5xf3+ Kg1f2 Nf3xd2 Bc3xd2 Qh3h2+ Kf2e3 Qh2xg3+ Ke3e2 Qg3g2+ Ke2e3 h7h5 Ra1d1 Rd8d4 b4b5 Qg2g3+ Ke3e2 Qg3g4+ Ke2e3
19 00:54 238.893.306 4.385.858 +1,84 Bg4h3 Nd2c4 Bh3xg2 Qc2xg2 Rd7d3 Bc3xe5 Ne6xg5 Be5xf6 Ng5xf3+ Kg1f2 Nf3xe1 g3g4 Ne1xg2 g4xh5 Rd8e8 h5xg6 f7xg6 Kf2xg2 Re8xe4 Ra1c1 Rd3b3 Nc4d6 Re4xb4
20 01:33 413.503.569 4.402.627 +1,60 Bg4h3 Nd2c4 Bh3xg2 Qc2xg2 Rd7d3 Bc3xe5 Ne6xg5 Be5xf6 Ng5xf3+ Kg1f2 Nf3xe1 g3g4 Ne1xg2 g4xh5 Rd8e8 Kf2xg2 Re8xe4 Ra1c1 Re4e2+ Kg2f1 Re2e6 Bf6e5 g6xh5

Jean-Paul

[Terry McCracken]

[D]3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Does your engine find Rxd2? How long does it take?

Solution: Rxd2 with huge advantage for black.

Difficulty: Tough

Hint: the idea is to outpost the knight, divert the active opponents bishop and attack the white kingside with two advanced knights.

Do you have the game score?

[Jouni]

Fritz10 after 2 hours in 4 best mode:

1. ³ (-0.69): 1...Rxd2 2.Bxd2 Nd4 3.fxg4 Nxg4 4.Qc3 Qh2+ 5.Kf1 Rf8 6.Be3 f6 7.Bxd4 fxg5+ 8.Bf3 exd4 9.Qc4+ Rf7 10.Qxf7+
2. ³ (-0.51): 1...Bh3 2.gxf6 Bxg2 3.Kxg2 Ng5 4.Re2 Qh3+ 5.Kf2 Qh2+ 6.Kf1 Qh1+ 7.Kf2 Nh3+ 8.Ke3 Ng1 9.Rf1 Qh6+ 10.f4 exf4+ 11.Rxf4 Nxe2
3. = (0.18): 1...Qxg5 2.Nf1 Bh5 3.Qb2 Nd4 4.Qf2 Nxf3+ 5.Bxf3 Rd3 6.Bxh5 Nxh5 7.Re3 Nf4 8.Kh1 Rxe3
4. ± (1.31): 1...Nxg5 2.fxg4 Nxg4 3.Nf1 Ne6 4.Rad1 Nd4 5.Bxd4 exd4 6.Qc1 Ne5 7.Qf4 Re7 8.b5 h6 9.Ne3 Qg5

Jouni

[Terry McCracken]

[D]3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Does your engine find Rxd2? How long does it take?

Solution: Rxd2 with huge advantage for black.

Difficulty: Tough

Hint: the idea is to outpost the knight, divert the active opponents bishop and attack the white kingside with two advanced knights.

Do you have the pgn or a link to the game? Yes Rxd2!! is completely winning and computers have a lot of trouble seeing this.

[swami]

[D]3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Does your engine find Rxd2? How long does it take?

Solution: Rxd2 with huge advantage for black.

Difficulty: Tough

Hint: the idea is to outpost the knight, divert the active opponents bishop and attack the white kingside with two advanced knights.

Do you have the pgn or a link to the game? Yes Rxd2!! is completely winning and computers have a lot of trouble seeing this.

Hi Terry,

Sorry for the delay,I have had a pretty hectic work, so was not around for a while since yesterday.

I don't have a full pgn, except the position and few comments.
But here is some info:

Event: Ukraine
Year 1993
Balashov, Sergey vs Yandemirov, Valeri

Perhaps you could google this bit of info to get the whole pgn.

Regards.

[Terry McCracken]

[D]3r2k1/pp1r1p1p/2p1nnp1/2P1p1Pq/PP2P1b1/2B2PP1/2QN2B1/R3R1K1 b - - 0 1

Does your engine find Rxd2? How long does it take?

Solution: Rxd2 with huge advantage for black.

Difficulty: Tough

Hint: the idea is to outpost the knight, divert the active opponents bishop and attack the white kingside with two advanced knights.

Do you have the pgn or a link to the game? Yes Rxd2!! is completely winning and computers have a lot of trouble seeing this.

Hi Terry,

Sorry for the delay,I have had a pretty hectic work, so was not around for a while since yesterday.

I don't have a full pgn, except the position and few comments.
But here is some info:

Event: Ukraine
Year 1993
Balashov, Sergey vs Yandemirov, Valeri

Perhaps you could google this bit of info to get the whole pgn.

Regards.

I haven't been able to locate the game as of yet. If I find it I'll post it.

Terry