difficult test position: Bxc5

[David Dahlem]

[D]6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - 0 1

Bxc5 is hard to find, but it leads to mate in 22.

[Event "Mate 22"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - 0 1 "]
[PlyCount "43"]

1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8
8.Ng6+ Ke8 9.Kc8 gxf3 10.a6 f2 11.a7 f1=Q 12.a8=N Qf4 13.Nc7+ Qxc7+ 14.Kxc7 d6 15.Kc8
dxc4 16.a4 c3 17.dxc3 d5 18.a5 d4 19.a6 d3 20.a7 d2 21.a8=N d1=Q 22.Nc7# {Mate} 1-0

[rightrook]

Easy for Hiarcs 11.2.....finds move one right away...after you show it the solution...

[yanquis1972]

Zappa mexico ii with mate extentions finds Bxc5+ at d19/13:55 on octal h/w.


6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - -

Engine: Zappa Mexico II (2048 MB)
by Anthony Cozzie
9/37 0:00 +0.14 1.Kb6 d4 2.Re8 Nd6 3.a6 Nxe8 4.Nxe8 Bxc4 (926.360) 2200
9/37 0:00 +0.14 1.Kb6 d4 2.Re8 Nd6 3.a6 Nxe8 4.Bf2 gxf3 (1.279.192) 2483
10/39 0:00 -0.43 1.Kb6 d4 2.Re8 Nd6 3.Rb8 Bf7 4.Rxh8 Rxh8 5.Bxg4 Nc8+ (1.508.509) 2614
10/39 0:00 -0.41 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 dxe3 4.Rxe3 Rxh4 5.Ne8 (2.352.702) 3141
10/39 0:01 -0.41 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 dxe3 4.Rxe3 Rxh4 5.Ne8 (3.881.512) 3456
11/41 0:01 -0.27 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Nxe8 4.Nxe8 dxe3 5.dxe3 Rh6 6.a6 Bh7 (5.028.406) 3622
11/41 0:01 -0.27 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Nxe8 4.Nxe8 dxe3 5.dxe3 Rh6 6.a6 Bh7 (7.172.166) 3831
12/43 0:02 -0.60 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Nxe8 4.Nxe8 dxe3 5.dxe3 Rh6 6.a6 Bh7 7.Nd6 Rxh4 (9.405.310) 4073
12/43 0:04 -0.60 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Nxe8 4.Nxe8 dxe3 5.dxe3 Rh6 6.a6 Bh7 7.Nd6 Rxh4 (22.535.961) 4644
13/45 0:06 -0.14 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 Bf7 4.Rxd7 Nc8+ 5.Kxc6 dxe3 6.Bxg4 exd2 7.a6 Rxh4 8.Rxf7 Rxg4 9.Rxf6 (29.600.337) 4708
13/45 0:07 -0.14 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 Bf7 4.Rxd7 Nc8+ 5.Kxc6 dxe3 6.Bxg4 exd2 7.a6 Rxh4 8.Rxf7 Rxg4 9.Rxf6 (36.486.994) 4792
14/47 0:09 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 Bf7 4.Rxd7 Nc8+ 5.Kxc6 dxe3 6.Bxg4 exd2 7.a6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kb6 Nc8+ 11.Kb7 (47.349.910) 4802
14/47 0:13 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 Bf7 4.Rxd7 Nc8+ 5.Kxc6 dxe3 6.Bxg4 exd2 7.a6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kb6 Nc8+ 11.Kb7 (65.441.054) 4982
15/49 0:19 -0.06 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bxc4 6.Rxh8 Rxh8 7.dxc4 Rxh4 8.Bd1 Nc8+ 9.Kb7 Rh8 10.a7 Nxa7 11.Kxa7 (100.752.421) 5089
15/49 0:29 -0.06 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bxc4 6.Rxh8 Rxh8 7.dxc4 Rxh4 8.Bd1 Nc8+ 9.Kb7 Rh8 10.a7 Nxa7 11.Kxa7 (156.279.920) 5345
16/51 0:37 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Nc8+ 7.Kxc6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kc6 Nc8 (197.578.008) 5325
16/51 0:49 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Nc8+ 7.Kxc6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kc6 Nc8 (266.169.226) 5395
17/53 0:57 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Nc8+ 7.Kxc6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kc6 Nc8 (311.972.701) 5434
17/53 1:35 0.00 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Nc8+ 7.Kxc6 Bg8 8.Rxh7 Rxh7 9.Kb7 Nd6+ 10.Kc6 Nc8 (532.756.758) 5564
18/55 2:29 -0.36 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Rb8+ 7.Kxc6 Nc8 8.Ne6 Be8 9.Kc7 Bxd7 10.Kxb8 Rxh4 11.Bf3 Rh3 12.Bb7 Rh8 13.Kc7 (844.451.161) 5650
18/55 5:21 -0.36 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Rb8+ 7.Kxc6 Nc8 8.Ne6 Be8 9.Kc7 Bxd7 10.Kxb8 Rxh4 11.Bf3 Rh3 12.Bb7 Rh8 13.Kc7 (1.900.073.499) 5915
19/57 6:41 -0.42 1.Re8 Nd6+ 2.Kb6 d4 3.Rd8 dxe3 4.Bxg4 exd2 5.a6 Bf7 6.Rxd7 Rb8+ 7.Kxc6 Nc8 8.Ne6 Be8 9.Kc7 Bxd7 10.Kxb8 Rxh4 11.Bf3 Rh3 12.Bb7 Kc3 13.Nd1+ Kc2 14.Nxc5 (2.364.666.546) 5890
19/57 13:55 +0.76 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ Ke7 13.Nf5+ Kf7 14.Bxg4 (4.518.632.851) 5411
19/57 14:29 +0.76 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ Ke7 13.Nf5+ Kf7 14.Bxg4 (4.712.373.537) 5417 TB:1
20/59 52:19 +0.90 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ Ke7 13.Nf5+ Kf7 14.Bxg4 (8.823.065.834) 2810 TB:36
20/59 80:34 +0.90 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ Ke7 13.Nf5+ Kf7 14.Bxg4 (10.156.371.953) 2100 TB:36
best move: Be3xc5 time: 206:19.491 min n/s: 821.687 nodes: 17.142.924.550 TB: 64

haven't tested default settings or other engines yet. my guesses in such a position would be spark, stockfish (long think/overnight), hiarcs.

[Glarean]

[D]6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - 0 1
Bxc5 is hard to find, but it leads to mate in 22.

A very interesting study. What's the name of the composer?

Regards: Walter

.

[ernst]

Naum finds it quite fast, but something more that a draw score proves to be more difficult.

CPU0: GenuineIntel Intel64 Family 6 Model 15 Stepping 11 3419 MHz
CPU1: GenuineIntel Intel64 Family 6 Model 15 Stepping 11 3419 MHz
CPU2: GenuineIntel Intel64 Family 6 Model 15 Stepping 11 3419 MHz
CPU3: GenuineIntel Intel64 Family 6 Model 15 Stepping 11 3419 MHz
GUI: Tablebases with 0 pieces found! [Cache: 32 MB + internal 0.00 MB]
GUI: Shredderbases with 0 pieces found (0 MB)
Engine: Naum 4.2 (1024 MB)
by Aleksandar Naumov
1/09 0:00 +2.88 1.a3+ (218) 5
2/16 0:00 +2.77 1.Na6+ Kxa5 (702) 16
3/19 0:00 +3.87 1.Kb6 Ka3 (6.537) 125
4/18 0:00 +1.16 1.Kb6 Ka3 2.Bxc5+ Kxb2 (9.705) 161
5/20 0:00 +0.60 1.Kb6 Ka3 2.Bxc5+ Kxb2 3.Bd4+ (11.349) 151
6/24 0:00 -1.06 1.Kb6 Ka3 2.Re7 gxf3 3.Nd1 Rxh4 (22.022) 262
6/30 0:00 +0.57 1.Re8 gxf3 2.a6 Rxh4 3.Kb6 d4 (126.867) 961
7/28 0:00 +0.39 1.Re8 Ka3 2.Bxc5+ Kxb2 3.Bxg4 Rxh4 4.Be2 (253.246) 1266
8/24 0:00 +0.48 1.Re8 Ka3 2.Bxc5+ Kxb2 3.Bxg4 Rxh4 4.Be2 dxc4 (262.515) 1274
9/30 0:00 -1.41 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Rxh4 4.Bf2 Rxg4 5.Rd8 (607.083) 1780
10/33 0:00 -0.98 1.Re8 Nd6+ 2.Kb6 d4 3.Bxg4 Nxe8 4.Nxe8 dxe3 5.dxe3 Rh6 (1.025.824) 2244
10/33 0:00 -0.56 1.Nxd5+ Kxa5 2.Nxf6 Nxe5 3.Nxh7 gxf3 4.Nf6 Kb4 5.h5 Ka3 (1.512.881) 2682
11/37 0:01 -0.82 1.Nxd5+ Kxa5 2.Nxf6 Nxe5 3.Nxh7 Rxh7 4.Bg2 d5+ 5.Kc8 Kb4 6.Bf2 (4.143.430) 3404
12/35 0:01 -0.88 1.Nxd5+ Kxa5 2.Nxf6 Nxe5 3.Nxh7 Rxh7 4.Bg2 d5+ 5.Kb8 Kb4 6.f6 Nf3 (6.687.737) 3694
13/38 0:02 -0.87 1.Re8 (8.267.744) 3990
13/43 0:02 -0.59 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Rxb8+ 7.Nxb8 (11.850.658) 4453
14/53 0:08 -0.10 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 (46.316.450) 5698 TB:81
15/52 0:09 -0.10 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 8.Nxb8 (53.533.364) 5757 TB:81
16/51 0:15 -0.05 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 8.Nxb8 Nc8 (95.610.200) 6096 TB:98
17/48 0:19 -0.12 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 8.Nxb8 Nc8 9.Nxd7 (117.722.294) 6176 TB:98
18/56 0:27 -0.12 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 8.Nxb8 Nc8 9.Nxd7 Rxh4 (175.432.403) 6314 TB:98
19/51 0:51 -0.07 1.Re8 Nd6+ 2.Kb6 d4 3.Rb8 Bf7 4.Na6+ Ka3 5.Bxg4 dxe3 6.dxe3 Kxb2 7.Kxc5+ Rxb8 8.Nxb8 Nc8 9.Nxd7 Rxh4 10.Nxf6 (337.777.529) 6531 TB:99
19/62 1:19 -0.06 1.Bxc5+ (531.986.500) 6653 TB:100
19/62 2:05 0.00 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ (853.973.915) 6820 TB:249
20/62 4:20 0.00 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 (1.835.621.556) 7048 TB:3.061
21/62 8:49 0.00 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 (3.776.821.379) 7135 TB:6.482
22/62 14:35 0.00 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 (6.254.788.096) 7145 TB:8.513
23/62 31:19 0.00 1.Bxc5+ Kxc5 2.d4+ Kxd4 3.Nb5+ Kxe5 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 9.a6 Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ (13.273.987.462) 7062 TB:16.737
best move: Be3xc5 time: 47:11.122 min n/s: 7.062.070 nodes: 18.976.776.374 TB: 16.737

[David Dahlem]

[D]6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - 0 1
Bxc5 is hard to find, but it leads to mate in 22.

A very interesting study. What's the name of the composer?

Regards: Walter

.

White to play and win
Martin van Essen
2nd Prize, Humor Tournament 2005

1.Bxc5+ The introduction is a bit loud, but that is part of the joke. After 1.Re8, Van Essen gives Nd6+ 2.Kb6 d4 3.Rb8 dxe3 4.a6 Bxc4 5.a3+ Kxa3 6.a7 gxf3 7.Nxc4+ Nxc4+ 8.dxc4 Rxb8+ 9.axb8Q f2 10.Nb5+ cxb5 11.Qf4 exd2 12.Qe3+ Ka4 13.Qd3 Rxh4 and White does not win. 1...Kxc5 Or 1...Kxa5 2.a3, and mate soon. 2.d4+ Kxd4 Again, 2...Kb4 3.Re3! leads to mate. 3.Nb5+ Kxe5 Black must flee; after 3...Kc5 4.d4+ Kb4 5.Re3 he is mated quickly. 4.Nd3+ Kxf5 5.Nd4+ Kg6 6.Nf4+ Kg7 7.Nf5+ Kf8 8.Ng6+ Ke8 and after all the turmoil of this Knight's chase à la Petrov, we find ourselves in the dead eye of a hurricane. 9.Kc8! 9.a6? Ne5 10.Nd6+ Kd8 11.a7 Nxg6 12.a8Q+ Ke7 13.Nf5+ Kf7 14.Bxg4 Nxh4 certainly doesn't win. But now, Black is in Zugzwang. None of his pieces can move in view of Nd6 or Ng7 mate. So: 9...gxf3 10.a6 f2 11.a7 f1Q 12.a8N! 12.a8Q Qxf5 13.Kc7+ Nd8 loses. 12...Qf4 13.Nc7+ After 9.Kc7, this would not have been possible. 13...Qxc7+ 14.Kxc7 And a second pawn race starts. 14...dxc4 15.a4 d5 16.Kc8! The Nf7 must not get a discovered check. 16...d4 17.a5 c3 18.a6 cxd2 18...c2 makes no difference. 19.a7 d1Q And the fourth knight appears. 20.a8N Ne5 All moves allow mate in 1. 21.Nd6 mate.

EDIT: i couldn't find a mate in 21. Found the mate in 22 by back analysis with Stockfish 1.6.3s.

[GARGAMEL]

Hello David

I believe, he is called Mark van Essen!

regards Anton

[David Dahlem]

Hello David

I believe, he is called Mark van Essen!

regards Anton

Maybe "Mark" is a nickname? Anyway, i copied directly from

http://www.xs4all.nl/~timkr/chess2/diary_14.htm

And there is a picture of "Martin van Essen".

[Ignacio]

After 18...d4, there is Mate in 3 with 19.cd4 c5 20.dc5 Nd6+ 21.Nxd6 mate.
The right is 18...c5 19.a6 d4 20.a7 d3 21.a8=Q Nd6+ 22. Nxd6 mate.