Old, but still difficult mate in 11 position

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Dan Astrachan
Posts: 134
Joined: Fri May 28, 2010 9:07 am

Re: Old, but still difficult mate in 11 position

Post by Dan Astrachan » Wed Sep 08, 2010 10:59 pm

The only engine that finds a mate in 11 on my machine is Fire 1.31

Code: Select all

FEN: 3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1 

Fire_131_x64_KLO_popcnt :
   
  29	03:50	3.644.869 949	15.804.000	+M11	e2e4 Qd8d4 Nb1c3 Ke8f7 d2d3 Qd4g7 d3d4 Qg7g6 Qd1f3+ Kf7g7 Bf1c4 Kg7h7 Qf3f8 Qg6xg2 Qf8h6+

kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 3:19 pm

Zappa is fast, + Houdini, Shredder struggles, Rybka in 13

Post by kgburcham » Thu Sep 09, 2010 3:37 am

[D] 3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1

Houdini DEVEL x64 POPCNT 12_CPU (4096 MB)
by Robert Houdart

14/37 0:00 +36.76 1.e4 Kf8 2.d4 Qb6 3.Nc3 Qe6 4.Qf3+ Kg8 5.Qg3+ Kf8 6.Qf4+ Kg7 7.Qg5+ Kh8 8.Qe5+ Qxe5 9.dxe5 Kg7 10.b4 Kf7 11.Bc4+ Ke8 (4.286.286) 7026
15/43 0:01 +40.29 1.e4 Qe7 2.Nc3 Kf8 3.d4 Qe6 4.Qf3+ Kg8 5.Qg3+ Kh7 6.Qh4+ Kg7 7.Qg5+ Kh8 8.Qe5+ Qxe5 9.dxe5 Kg7 10.b4 Kh8 11.e6 Kg8 (11.872.404) 6640
16/43 0:02 +43.63 1.e4 Qe7 2.Nc3 Kf8 3.d4 Qe6 4.Qf3+ Kg8 5.Qg3+ Kf8 6.Qc7 Qf7 7.Bh6+ Kg8 8.Qxf7+ Kxf7 9.a4 Kg6 10.Bf4 Kg7 11.a5 Kh7 (14.854.551) 6596
17/45 0:03 +45.79 1.e4 Qe7 2.Nc3 Kf8 3.d4 Qe6 4.Qf3+ Kg8 5.Qg3+ Kh7 6.Qc7+ Kh8 7.Qe5+ Qxe5 8.dxe5 Kg7 9.b4 Kh8 10.e6 Kg8 11.Nd5 Kf8 (25.086.446) 6468
18/46 0:06 +M21 1.e4 Qd4 2.Nc3 Ke7 3.Nd5+ Kf8 4.Qf3+ Kg7 5.Qg4+ Kf8 6.Qf4+ Kg7 7.Qg5+ Kh8 8.Qh4+ Kg8 9.Nf6+ Kf7 10.Qh5+ Kf8 (35.725.929) 5809
19/46 0:06 +M20 1.e4 Qd4 2.Nc3 Ke7 3.Nd5+ Kf8 4.Qf3+ Kg7 5.Qg3+ Kh7 6.Qh4+ Kg7 7.Qe7+ Kh8 8.Qf8+ Kh7 9.Nf6+ Kg6 10.Qg8+ Kxf6 11.Qh8+ Kf7 (37.550.450) 5756
20/46 0:10 +M16 1.e4 Qd4 2.Nc3 Kf8 3.Nf3 Qg7 4.d4 Ke7 5.Ne5 Kd8 6.Nd5 Kc8 7.Qg4+ Qxg4 8.Nxg4 Kb8 9.Ne5 Kb7 10.Bg5 Ka8 11.h4 Ka7 12.h5 Kb8 (58.370.100) 5489
21/46 0:17 +M13 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.Qb8+ Ke7 9.Nd5+ Kf7 10.Nxf6+ Kxf6 11.Qe5+ Kg6 (92.891.211) 5462
22/46 0:18 +M13 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.Qb8+ Ke7 9.Nd5+ Kf7 10.Nxf6+ Kxf6 11.Qe5+ Kg6 (99.183.872) 5462
23/46 0:19 +M13 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.Qb8+ Ke7 9.Nd5+ Kf7 10.Nxf6+ Kxf6 11.Qe5+ Kg6 (105.862.621) 5454
24/46 0:31 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (171.871.112) 5486
25/46 0:33 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (184.927.782) 5476
26/46 0:39 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (216.105.291) 5452
27/46 0:48 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (263.183.441) 5420
28/46 1:11 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (382.115.294) 5338
29/46 1:43 +M12 1.e4 Qd4 2.Nc3 Kf8 3.Qh5 Kg7 4.Nf3 Qf6 5.Bc4 Qg6 6.Qe5+ Qf6 7.Qc7+ Kf8 8.b3 Qe7 9.Ba3 Kg7 10.Qxe7+ Kh8 11.Qf6+ Kh7 12.Ng5+ (547.704.655) 5281
30/46 4:13 +M11 1.e4 Qd4 2.Nc3 Kf8 3.Qg4 Kf7 4.Nf3 Qd6 5.d4 Ke7 6.Ne5 Kd8 7.Bg5+ Kc7 8.Nb5+ Kb6 9.Nxd6 Ka5 10.Qd7 Kb4 11.Qb5+ (1.338.811.684) 5285
31/46 4:50 +M11 1.e4 Qd4 2.Nc3 Kf8 3.Qg4 Kf7 4.Nf3 Qd6 5.d4 Ke7 6.Ne5 Kd8 7.Bg5+ Kc7 8.Nb5+ Kb6 9.Nxd6 Ka5 10.Qd7 Kb4 11.Qb5+ (1.527.831.638) 5263
31/46 4:57 +M11 1.e4 Qd4 2.Nc3 Kf8 3.Qg4 Kf7 4.Nf3 Qd6 5.d4 Ke7 6.Ne5 Kd8 7.Bg5+ Kc7 8.Nb5+ Kb6 9.Nxd6 Ka5 10.Qd7 Kb4 11.Qb5+ (1.567.958.226) 5266
best move: e2-e4 time: 4:58.406 min n/s: 5.266.000 CPU 99.2% n/s(1CPU): 5.308.467 nodes: 1.567.958.226

Deep Rybka 4 x64 (4096 MB)

10.00 0:00 +30.56 1.e3 Qa5 2.Nc3 Qg5 3.Qf3 Ke7 4.Qe4+ Kf7 5.Qd5+ Qxd5 6.Nxd5 Ke6 7.Nf4+ Kd6 8.Nf3 Kc5 9.d4+ Kd6 10.a4 Ke7 11.Bd2 (699.890) 1277
11.00 0:01 +31.52 1.e3 Qa5 2.Nc3 Qf5 3.Qf3 Qxf3 4.Nxf3 Kd7 5.a4 Kd6 6.d4 Kc7 7.h4 Kd6 8.a5 Kc7 9.Nb5+ Kd8 10.a6 Ke7 (1.567.493) 1392
12.01 0:03 +33.84 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qxd4 4.exd4 Kb7 5.Nc3 Kc7 6.Nf3 Kd7 7.Ne5+ Kc8 8.a4 Kb8 9.h4 Kc7 10.h5 Kb7 11.h6 Kb6 12.h7 Ka5 13.h8Q Kb6 (5.202.547) 1715
13.01 0:04 +37.42 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qxd4 4.exd4 Kb7 5.Nc3 Kc7 6.Nf3 Kd7 7.Ne5+ Kc8 8.a4 Kb8 9.h4 Kc7 10.h5 Kb7 11.h6 Kb6 12.h7 Ka5 13.h8Q Kb6 14.a5+ (7.078.720) 1658
14.01 0:40 +M14 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qe8 4.Qc5+ Kb7 5.Qb5+ Qxb5 6.Bxb5 Ka8 7.a4 Ka7 8.a5 Kb7 9.a6+ Ka7 10.Nf3 Kb8 11.a7+ Kc7 12.a8Q Kd6 13.Qf8+ Kc7 14.Qc5+ (72.510.237) 1773
15.01 2:00 +M13 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qe8 4.Nc3 Qd7 5.Qa7+ Kd8 6.Qb8+ Ke7 7.Qe5+ Kd8 8.Bb5 Qb7 9.Qd6+ Kc8 10.Nd5 Qxb5 11.Qc7+ (220.912.085) 1830
16.01 2:28 +M13 1.e3 Kd7 2.Qg4+ Kc7 3.Qc4+ Kb8 4.Qb4+ Ka8 5.Nc3 Qd7 6.Qa5+ Kb8 7.Qb5+ Qxb5 8.Bxb5 Ka7 9.Nb1 Ka8 10.a4 Ka7 11.a5 Kb7 12.a6+ Ka7 13.Nf3 Kb8 14.Nc3 (270.547.720) 1826
17.01 2:43 +M13 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qc8 4.Qc3+ Kb8 5.Qxc8+ Kxc8 6.h4 Kd8 7.h5 Ke7 8.h6 Kf6 9.h7 Kf5 10.h8Q Kg6 11.Rh6+ Kg5 12.Qf6+ Kg4 13.Be2+ (298.921.191) 1828
18.01 3:00 +M13 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qd6 4.Qxd6+ Kxd6 5.h4 Ke7 6.h5 Kf7 7.h6 Kg6 8.h7 Kf5 9.Rh5+ Kg6 10.Bd3+ Kxh5 11.h8Q+ Kg4 12.f3+ Kg5 13.Nh3+ (329.423.705) 1829
18.01 9:03 +M13 1.e3 Kd7 2.Qg4+ Kc7 3.Qd4 Qd6 4.Qxd6+ Kxd6 5.h4 Ke7 6.h5 Kf7 7.h6 Kg6 8.h7 Kf5 9.Rh5+ Kg6 10.Bd3+ Kxh5 11.h8Q+ Kg4 12.f3+ Kg5 13.Nh3+ (1.035.105.075) 1903
best move: e2-e3 time: 9:04.438 min n/s: 1.903.582 nodes: 1.035.105.075

Deep Shredder 12 x64 (4096 MB)

10/30 0:01 +35.70 1.e4 Qh4 2.Nc3 Kd8 3.Bb5 Qg5 (14.650.819) 12028
11/32 0:01 +36.64 1.e4 Qh4 (20.365.735) 11958
12/36 0:06 +43.75 1.e4 Qg5 2.Nc3 Kd7 3.d4 Qg6 4.Nf3 Kd8 5.Ne5 Qg8 6.Nd5 Qg7 (73.167.907) 12069
13/37 0:10 +46.17 1.e4 Qg5 2.Nc3 Kd7 3.d4 Qg6 4.Nf3 Kd8 5.Ne5 Qg8 6.Nd5 Qxd5 7.Bg5+ Kc7 8.exd5 Kb8 9.Nc6+ Kc7 10.Bd8+ Kd6 (128.083.876) 11744
14/38 0:28 +M150++ 1.e4 Qg5 2.Nc3 Kd7 3.d4 Qg6 4.Nf3 Kc8 5.Ne5 Qe6 6.Bc4 Qh3 7.Ba6+ Kb8 8.gxh3 Ka7 9.Bg5 Kxa6 10.Qd3+ Ka7 11.Qb5 Ka8 (300.195.352) 10703
15/34 0:30 +M150++ 1.e4 Qg5 2.Nc3 Kd7 3.d4 Qg6 4.Nf3 Kc8 5.Ne5 Qe6 6.Bc4 Qh3 7.Ba6+ Kb8 8.gxh3 Ka7 9.Bg5 Kxa6 10.Qd3+ Ka7 11.Qb5 Ka8 (324.983.235) 10644
best move: e2-e4 time: 9:53.157 min n/s: 11.173.423 CPU 1199.1% n/s(1CPU): 931.817 nodes: 6.627.236.246

Zappa Mexico II (4096 MB)

11/28 0:00 +21.63 1.e4 Qh4 2.Bb5+ Kd8 3.Qf3 Qe7 4.Qg4 Kc7 5.Qd7+ Kb8 6.Qxe7 Kc8 (1.851.410) 8492
11/28 0:00 +23.68 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Ke7 4.Bb5 Qe5 5.Nd5+ (3.890.454) 9582
11/28 0:00 +23.68 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Ke7 4.Bb5 Qe5 5.Nd5+ (3.892.928) 9588
12/31 0:00 +23.80 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Qh6 4.Bb5 Ke7 5.Nd5+ (5.380.068) 10446
12/31 0:00 +23.80 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Qh6 4.Bb5 Ke7 5.Nd5+ (5.470.865) 10302
13/33 0:00 +23.94 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Qh6 4.Bb5 Ke7 5.Nd5+ Ke6 6.Bc4 (9.114.196) 11224
13/33 0:00 +23.94 1.e3 Qg5 2.Qf3 Kd8 3.Nc3 Qh6 4.Bb5 Ke7 5.Nd5+ Ke6 6.Bc4 (9.477.373) 11242
14/47 0:03 +25.20 1.e3 Qd5 2.Qf3 Qxf3 3.Nxf3 Kd8 4.a4 Kc7 5.a5 Kb8 6.b4 (51.737.104) 14272
14/47 0:03 +25.20 1.e3 Qd5 2.Qf3 Qxf3 3.Nxf3 Kd8 4.a4 Kc7 5.a5 Kb8 6.b4 (52.640.944) 14215
15/47 0:04 +25.40 1.e3 Qd5 2.Qf3 Qxf3 3.Nxf3 Kd8 4.a4 Kc7 5.a5 Kb8 6.b4 Kb7 (58.832.791) 14483
15/47 0:07 +28.27 1.e4 Qh4 2.Bb5+ Kd8 3.Qf3 Qe7 4.Qf4 Kc8 5.Ba6+ Kd7 6.d4 Qh7 7.Bb5+ Kc8 8.Qf8+ Kb7 9.Bf4 Qe7 10.Qxe7+ (111.085.414) 14106
15/47 0:07 +28.27 1.e4 Qh4 2.Bb5+ Kd8 3.Qf3 Qe7 4.Qf4 Kc8 5.Ba6+ Kd7 6.d4 Qh7 7.Bb5+ Kc8 8.Qf8+ Kb7 9.Bf4 Qe7 10.Qxe7+ (111.212.893) 14122
16/51 0:48 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (759.552.315) 15808
16/51 0:48 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (764.842.753) 15795
17/51 0:49 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (776.555.949) 15822
17/51 0:49 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (786.042.368) 15824
18/51 0:53 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (862.345.348) 16081
18/51 1:00 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (981.112.032) 16254
19/55 1:04 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (1.071.698.828) 16499
19/55 1:10 +M11 1.e4 Qh4 2.Qf3 Qe7 3.Bb5+ Kd8 4.d4 Kc8 5.Bf4 Qb4+ 6.Nc3 Qxb5 7.Nxb5 Kd7 8.Qg4+ Kc6 9.Qe6+ Kb7 10.Nf3 Ka8 11.Qa6+ (1.175.476.987) 16588
best move: e2-e4 time: 1:14.953 min n/s: 21.925.150 nodes: 1.229.808.487

User avatar
David Dahlem
Posts: 900
Joined: Wed Mar 08, 2006 8:06 pm

Re: Old, but still difficult mate in 11 position

Post by David Dahlem » Thu Sep 09, 2010 3:46 pm

Jouni wrote:[D]3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 11x

Only solution among my top engines:

Analysis by Houdini 1.03a x64 2_CPU:

1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6+ Kd8 6.Bb5 Qe6 7.Nd5 Qxd5 8.exd5 Kc8 9.Bc6 Kd8 10.d6 Kc8 11.Qf8#
+- (#11) Depth: 29/49 00:11:59 2986mN

Jouni
FEN: 3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1

Ivanhoe T0.4 beta 32-bit 2CPU:

27 08:57 954.236.814 1.777.000 +M11 e2e4 Qd8g5 d2d4 Qg5g6 Qd1f3 Ke8e7 Nb1c3 Qg6f7 Qf3g3 Ke7d7 Bf1b5+ Kd7c8 Bb5a6+ Kc8d7 Nc3d5 Kd7c6 Qg3c3+ Kc6d7 Qc3c7+ Kd7e8 Qc7c8+

Dan Astrachan
Posts: 134
Joined: Fri May 28, 2010 9:07 am

Re: Old, but still difficult mate in 11 position

Post by Dan Astrachan » Thu Sep 09, 2010 4:30 pm

Ivanhoe 9.55b also finds the mate in 11 (needs over 15 minutes of my quad-core machine though)

Code: Select all

M11 1.e4 Qd4 2.Nc3 Kf8 3.Qf3+ Kg8 4.h4 Kg7 5.Rh3 Qf6 6.Rg3+ Kf7 7.Bc4+ Ke7 8.Nd5+ Kd6 9.Qxf6+ Kc5 10.Qb6+ Kxc4 11.Qb4#  (5.30)

PawnStormZ
Posts: 880
Joined: Mon Feb 15, 2010 5:43 am

Old, but still difficult mate in 11 position

Post by PawnStormZ » Thu Sep 09, 2010 11:47 pm

     
     Houdini 1.03a finds mate very fast here, and gets down to M11 in under 3 min...

[Mate in 11] d=31 1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6 Kd8 6.Bb5 Qe6 7.Nd5 Qxd5 8.exd5 Kc8 9.Bc6 Kd8 10.d6 Kc8 11.Qf8# (0:04:32) 2984006kN

[Mate in 11] d=30 1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6 Kd8 6.Bb5 Qe6 7.Nd5 Qxd5 8.exd5 Kc8 9.Bc6 Kd8 10.d6 Kc8 11.Qf8# (0:03:39) 2402702kN

[Mate in 11] d=29 1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6 Kd8 6.Bb5 Qe6 7.Nd5 Qxd5 8.exd5 Kc8 9.Bc6 Kd8 10.d6 Kc8 11.Qf8# (0:03:09) 2070865kN

[Mate in 11] d=28 1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6 Kd8 6.Bb5 Qe6 7.Nd5 Qxd5 8.exd5 Kc8 9.Bc6 Kd8 10.d6 Kc8 11.Qf8# (0:02:49) 1844586kN

[Mate in 12] d=27 1.e4 Qd4 2.Qg4 Kd8 3.Nc3 Qd7 4.Qf4 Kc8 5.Ba6 Kd8 6.Nd5 Ke8 7.Bb5 Qxb5 8.Qe5 Kf7 9.Qf6 Kg8 10.Ne7 Kh7 11.Qg6 Kh8 12.Qh6# (0:01:19) 856652kN

[Mate in 12] d=26 1.e4 Qd4 2.Qg4 Kf7 3.Nc3 Kf8 4.Qc8 Ke7 5.Nd5 Kf7 6.Qd7 Kg8 7.Ne7 Kf8 8.Qxd4 Kxe7 9.Qg7 Kd6 10.d4 Kc6 11.Bf4 Kb6 12.Qc7# (0:00:57) 609513kN

[Mate in 12] d=25 1.e4 Qd4 2.Qg4 Kf7 3.Nc3 Kf8 4.Qc8 Ke7 5.Nd5 Kf7 6.Qd7 Kg8 7.Ne7 Kf8 8.Qxd4 Kxe7 9.Qg7 Kd6 10.d4 Kc6 11.Bf4 Kb6 12.Qc7# (0:00:52) 554925kN

[Mate in 12] d=24 1.e4 Qd4 2.Qg4 Kf7 3.Nc3 Qb4 4.Qh5 Kg8 5.d4 Kg7 6.Bh6 Kf6 7.Qe5 Kf7 8.Qg7 Ke8 9.Bb5 Qxb5 10.Nxb5 Kd8 11.Qc7 Ke8 12.Nd6# (0:00:47) 501031kN

[Mate in 14] d=23 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qg6 6.Qxg6 Kxg6 7.Nd5 Kf7 8.a4 Kf8 9.a5 Kg8 10.a6 Kf7 11.a7 Kg6 12.a8Q Kh5 13.Be2 Kg6 14.Qg8# (0:00:19) 189219kN

[Mate in 14] d=22 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qg6 6.Qxg6 Kxg6 7.Nd5 Kf7 8.a4 Kf8 9.a5 Kg8 10.a6 Kf7 11.a7 Kg6 12.a8Q Kh5 13.Be2 Kg6 14.Qg8# (0:00:17) 168495kN

[Mate in 14] d=21 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qg6 6.Qxg6 Kxg6 7.Nd5 Kf7 8.a4 Kf8 9.a5 Kg8 10.a6 Kf7 11.a7 Kg6 12.a8Q Kh5 13.Be2 Kg6 14.Qg8# (0:00:15) 153403kN

[Mate in 20] d=20 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qc6 6.Bc4 Qxc4 7.Bh6 Kh7 8.Bg5 Kg7 9.Qh6 Kf7 10.Qf6 Kg8 11.Qg6 Kf8 12.Bh6 Ke7 13.Nd5 Kd8 14.Qg8 Kd7 15.Qg7 Kd6 16.Qe7 Kc6 17.Qc7 Kb5 18.Qb6 Ka4 19.b3 Ka3 20.Bc1# (0:00:08) 70440kN

[Mate in 20] d=19 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qc6 6.Bc4 Qxc4 7.Bh6 Kh7 8.Bg5 Kg7 9.Qh6 Kf7 10.Qf6 Kg8 11.Qg6 Kf8 12.Bh6 Ke7 13.Nd5 Kd8 14.Qg8 Kd7 15.Qg7 Kd6 16.Qe7 Kc6 17.Qc7 Kb5 18.Qb6 Ka4 19.b3 Ka3 20.Bc1# (0:00:07) 67349kN

[Mate in 20] d=18 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qc6 6.Bc4 Qxc4 7.Bh6 Kh7 8.Bg5 Kg7 9.Qh6 Kf7 10.Qf6 Kg8 11.Qg6 Kf8 12.Bh6 Ke7 13.Nd5 Kd8 14.Qg8 Kd7 15.Qg7 Kd6 16.Qe7 Kc6 17.Qc7 Kb5 18.Qb6 Ka4 19.b3 Ka3 20.Bc1# (0:00:07) 62285kN

[Mate in 21] d=17 1.e4 Qd4 2.Qh5 Kf8 3.Nc3 Kg7 4.d3 Qf6 5.d4 Qc6 6.Bc4 Qxc4 7.Bh6 Kh7 8.Bg5 Kg7 9.Qh6 Kf7 10.Qf6 Kg8 11.Qg6 Kf8 12.Bh6 Ke7 13.Nd5 Kd8 14.Qg8 Kd7 15.Qg7 Kd6 16.Qe7 Kc6 17.Qc7 Kb5 18.Qb7 Ka5 19.Bd2 Ka4 20.Qd7 Qb5 21.Nb6# (0:00:06) 52150kN

[+45.05] d=16 1.e4 Kf7 2.d4 Qd6 3.Qh5 Kg7 4.Qe5 Qf6 5.Qxf6 Kxf6 6.Bc4 Kg7 7.h4 Kh7 8.h5 Kh8 9.e5 Kh7 10.a4 Kg7 11.a5 Kh8 12.h6 Kh7 13.Bd3 Kg8 14.a6 Kf7 15.a7 Ke6 16.Ra6 Ke7 17.a8Q (0:00:04) 34852kN

[+40.86] d=15 1.e4 Kf7 2.d4 Qd6 3.Qh5 Kg7 4.Qe5 Qxe5 5.dxe5 Kf8 6.Nf3 Ke7 7.Bc4 Kd7 8.e6 Kd6 9.Bf4 Kc6 10.Bg5 Kc5 11.e7 Kxc4 12.e8Q Kc5 13.Be3 Kd6 14.Bf4 Kc5 15.Nc3 Kb6 16.Nd4 (0:00:02) 22349kN

[+37.05] d=14 1.e4 Qb6 2.d4 Qg6 3.Qf3 Ke7 4.Qf5 Qxf5 5.exf5 Kf6 6.Bd3 Ke7 7.a4 Kd6 8.Bf4 Kd5 9.Nf3 Kc6 10.Nc3 Kd7 11.a5 Ke7 12.a6 (0:00:01) 10446kN

[+36.15] d=13 1.e4 Qb6 2.d4 Kf8 3.Qf3 Kg7 4.Qg3 Kh7 5.e5 Qc7 6.e6 Qe7 7.Bd3 Kh8 8.Qe5 Kg8 9.Qg5 Kf8 10.Qxe7 Kxe7 11.d5 Kd6 12.Nc3 Ke7 13.Bg5 Kd6 (0:00:01) 5855kN

[+35.91] d=12 1.e4 Qb6 2.d4 Kf8 3.Qf3 Ke8 4.Qh5 Kd8 5.Qd5 Kc7 6.Qc5 Qxc5 7.dxc5 Kd7 8.Bb5 Ke6 9.Nc3 Ke7 10.Bg5 Kf7 11.Nd5 (0:00:00) 3380kN
     
     I guess that it takes a "new" engine to solve an "old" problem quickly!       :)

     

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