TalkChess.com

Posted: **Sun Mar 14, 2010 8:44 pm**

[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

Posted: **Sun Mar 14, 2010 9:15 pm**

Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

Code: Select all

rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -

Engine: bright-0.4a (64 MB)
von AJ Siemelink

12/36  0:01   +0.68    1.Dh4 h5 2.Se6 fxe6 3.dxe6 Lxe6 
                       4.f7+ Sxf7 5.De4 Se5 6.Dxa8 Sbc6 
                       7.Dxd8+ Sxd8 8.Lg5 Sdc6 (4.810.149) 4 

13/45  0:01   +0.69    1.Dh4 h5 2.Se6 fxe6 3.dxe6 Lxe6 
                       4.f7+ Sxf7 5.De4 Se5 6.Dxa8 Sbc6 
                       7.Dxd8+ Sxd8 8.a5 bxa5 9.Txa5 (8.468.550) 4 

14/45  0:07   +0.72    1.Dh4 h5 2.Lf4 Sbd7 3.Se4 a6 4.Le2 Df8 
                       5.Tab1 Lb7 6.Lxe5 Sxe5 7.Txb6 Lxd5 
                       8.Txd6 (33.609.920) 4 

14/45  0:10   +1.03    1.Lf4 Sbd7 2.Se4 Df8 3.c4 Lb7 4.De3 Sg4 
                       5.Dc3 Sge5 6.Lxd7 Txd7 7.Lxe5 dxe5 
                       8.Dxe5 (50.263.900) 4 

14/45  0:12   +2.46    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sd7 7.Lxg4 Sf8 
                       8.Lxh5 Sh7 9.Dh6 gxh5 10.Dxh5 (57.506.335) 4 

15/45  0:12   +2.46    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sd7 7.Lxg4 Sf8 
                       8.Lxh5 Sh7 9.Dh6 gxh5 10.Dxh5 (59.775.959) 4 

16/45  0:18   +5.03    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sd7 7.Lxg4 Sf8 
                       8.Lxh5 Sh7 9.Dg3 c4 10.Lg4 (92.004.958) 4 

17/68  0:25   +5.07    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sd7 7.Lxg4 Sf8 
                       8.Lxh5 Sh7 9.Dg3 c4 10.Le2 Tb8 (124.399.981) 4 

18/68  0:36   +5.15    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sd7 7.Lxg4 Sf8 
                       8.Lxh5 Sh7 9.Dg3 c4 10.Le2 Tb8 
                       11.Tf4 (182.570.678) 5

[/quote]

Posted: **Sun Mar 14, 2010 9:19 pm**

Yes this position is in my test suite. Here are some results for you - the programs were running on Core i7 @ 3.4Ghz and had max 10 minutes to think:

Deep Fritz 10.1 = 1.7 s
Spark 0.3a = 3.4 s
Bright 0.4a = 4.4 s
Hiarcs 12.1 = 6.9 s
Fritz 9 = 10.4 s (1 core)
Stockfish 1.5 = 23.1 s
Zappa Mexico II = 38.2 s
Deep Shredder 12 = 38.8 s
Deep Junior 2010 = 42 s
Deep Junior 11.1 = 42 s (boring!)
Rybka 3 = 44.6 s
Naum 4.1 = 63.4 s
Crafty 22.9 = 97.7 s
Glaurung 2.2 = 126.3 s
Deep Fritz 12 = 238.7 s
Naum 4.0 = 285.8 s

Obviously with quad core there is a certain degree of search luck.

Posted: **Sun Mar 14, 2010 9:21 pm**

Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

Code: Select all

rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -

Engine: Hermann 2.5.13 (64 MB)
von Volker Annuss

7/23   0:00   -0.06    1.a5 La6 2.axb6 axb6 3.c4 Tca7 4.Dh4 h5 (135.248) 452 

8/31   0:00   -0.18    1.a5 La6 2.axb6 axb6 3.Dh4 h5 4.Tf2 Tca7 
                       5.La4 (308.790) 460 

8/31   0:00   -0.18++  1.Se4 h5 (337.857) 463 

8/31   0:00   -0.07    1.Se4 a6 2.Le2 Lg4 3.Lh6 Tb7 4.g3 Lxe2 
                       5.Dxe2 (458.898) 471 

8/31   0:01   -0.07++  1.Lf4 a6 2.a5 h6 3.axb6 Tc6 (742.984) 476 

8/31   0:01   -0.07    1.Se4 a6 2.Le2 Lg4 3.Lh6 Tb7 4.g3 Lxe2 
                       5.Dxe2 (818.351) 475 

8/31   0:01   -0.07++  1.Dd2 a6 2.Le2 h6 3.Se4 Sbd7 4.Sxd6 Sxf6 
                       5.Sxc8 Tcxc8 (842.545) 475 

8/31   0:01   -0.07    1.Se4 a6 2.Le2 Lg4 3.Lh6 Tb7 4.g3 Lxe2 
                       5.Dxe2 (913.148) 478 

9/31   0:02   -0.11    1.Se4 a6 2.Le2 Lg4 3.Lxg4 Sxg4 4.Dg3 Se5 
                       5.Lh6 Kh8 (1.137.599) 482 

9/31   0:02   -0.11++  1.Dd2 a6 2.Le2 c4 3.a5 b5 (1.187.573) 480 

9/32   0:03   -0.11    1.Se4 a6 2.Le2 Lg4 3.Lxg4 Sxg4 4.Dg3 Se5 
                       5.Lh6 Kh8 (1.811.258) 485 

10/32  0:06   -0.09    1.Se4 a6 2.Le2 Lf5 3.Dh4 h5 4.Tb1 Sbd7 
                       5.Lg5 Df8 6.Tfe1 (3.001.523) 489 

11/33  0:10   -0.04    1.Se4 a6 2.Le2 Lg4 3.Lxg4 Sxg4 4.Dg3 Se5 
                       5.Lf4 Td7 6.Lh6 Kh8 (5.018.974) 488 

12/35  0:18   +0.05    1.Se4 a6 2.Le2 Lf5 3.Dh4 Lxe4 4.Dxe4 Sbd7 
                       5.Dh4 h5 6.Lh6 c4 7.a5 b5 (9.130.340) 483 

13/35  0:26   +0.02    1.Se4 a6 2.Le2 Lf5 3.Dh4 Lxe4 4.Dxe4 Sbd7 
                       5.Dh4 c4 6.La3 Df8 7.Df4 h5 8.Tfe1 (12.557.377) 481 

14/39  0:54   +0.06    1.Se4 a6 2.Le2 Lf5 3.Dh4 Lxe4 4.Dxe4 Sbd7 
                       5.Dh4 c4 6.La3 Df8 7.Df4 h5 8.Tfe1 Te8 (26.353.565) 479 

14/39  1:32   +0.06++  1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Sa6 
                       4.Lxa6 Lg4 (43.880.067) 474 

14/39  1:37   +0.56++  1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Sbd7 
                       4.Lxd7 Tb8 5.Lxc8 Sd7 (46.425.729) 473 

14/45  2:33   +3.89    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.h3 Sxf6 7.Txf6 Kxg7 
                       8.Txg6+ fxg6 9.Dxd8 Tf7 (71.521.653) 465

Posted: **Sun Mar 14, 2010 9:22 pm**

Werewolf wrote:Deep Fritz 10.1 = 1.7 s
Deep Fritz 12 = 238.7 s

Posted: **Sun Mar 14, 2010 9:27 pm**

Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

Code: Select all

rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -

Engine: Tao 5.6 (64 MB)
von Bas Hamstra

9/22   0:01   +0.29    1.Dh4 h5 2.Le2 a6 3.Tb1 Lg4 4.Lxg4 Sxg4 
                       5.Lf4 (1.082.813) 855 

9/22   0:02   +0.29++  1.Sxh7 (2.018.225) 942 

9/22   0:02   +1.17    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 g5 
                       4.Dxg5+ Sg6 5.Tae1 Td7 6.Lxd7 Lxd7 (2.288.142) 942 

10/25  0:02   +1.25    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Le2 b5 6.axb5 Tb7 7.Lxh5 gxh5 
                       8.Dxh5 Txb5 (2.883.670) 972 

11/27  0:04   +1.25    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Le2 b5 6.axb5 Tb7 7.Lxh5 gxh5 
                       8.Dxh5 Txb5 (4.225.357) 981 

12/30  0:06   +1.10    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Df4 Sg4 6.h3 a6 7.hxg4 axb5 
                       8.gxh5 (6.521.886) 1022 

13/32  0:15   +1.10    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Df4 Sg4 6.h3 a6 7.hxg4 axb5 
                       8.gxh5 (16.330.304) 1031 

14/35  1:16   +4.22    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.Le2 Sxf6 
                       7.Lxf6 Df8 8.Lxh5 Sd7 (79.386.613) 1035

Posted: **Sun Mar 14, 2010 9:37 pm**

Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

Code: Select all

rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -

Engine: Naum 4 (64 MB)
von Aleksandar Naumov

12/34  0:01   +1.08    1.Dh4 h5 2.Le2 Sbd7 3.Df4 Df8 4.c4 Lb7 
                       5.a5 Te8 6.axb6 axb6 (1.299.417) 742 

13/35  0:03   +1.16    1.Dh4 h5 2.Le2 La6 3.c4 Sbd7 4.Df4 Df8 
                       5.Ta3 Te8 6.Lb2 Dh6 7.Te3 (2.362.410) 781 

14/35  0:04   +1.20    1.Dh4 h5 2.Le2 La6 3.c4 Sbd7 4.Df4 Df8 
                       5.Ta3 Dh6 6.Ld2 Tb8 7.Tg3 Te8 (3.769.276) 813 

15/36  0:07   +1.12    1.Dh4 h5 2.Le2 La6 3.c4 Sbd7 4.Df4 Df8 
                       5.Ta3 Dh6 6.Ld2 Tb8 7.Tg3 Te8 8.Te3 (6.194.134) 862 

15/55  1:11   +5.41    1.Sxh7 Kxh7 2.Dh4+ Kg8 3.Lh6 Lg4 
                       4.Lg7 Lh5 5.Dg5 Sg4 6.h3 Sxf6 7.Txf6 Kxg7 
                       8.Txg6+ (69.509.460) 970

Posted: **Mon Mar 15, 2010 9:02 pm**

Frederic Louguet was operating Genius 2 at this 1994 Aubervilliers Rapid Tournament,
and he included this test into his famous LCTII testsuite...

Posted: **Tue Mar 16, 2010 3:37 am**

Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.

I was hoping to find the mate in eight but it is probably out of reach anyway. This version finds at least Nxh7+ - but everything after this is hopelessly in disrepair and does not seem to find it, maybe this one is is also not good anymore, I was a bit too hasty trying to find Jakovenko - Kramnik and definitely blew the engine up

Don't know if it can be repaired. It's a mess. But those numbers look so nice

Eelco

[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 193 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +3.91 1.Qh4 (101) 0

2.00 0:00 +1.17 1.Qh4 h5 (745) 3

3.00 0:00 +3.07 1.Qh4 h5 2.Qe4 (5.362) 21

4.00 0:00 +1.25 1.Qh4 h5 2.a5 Bb7 3.axb6 axb6 (16.202) 61

4.00 0:00 +2.34 1.a5 Bd7 2.Qh4 h5 3.axb6 axb6 4.Rxa8 Bxb5 (38.961) 113

5.00 0:00 +0.96 1.a5 bxa5 2.Qh4 h5 3.Be2 Ba6 4.Bxa6 Nxa6
5.Rxa5 Nb8 6.Qf4 Rb7 (79.954) 182

6.01 0:01 +1.69 1.a5 bxa5 2.Qh4 h5 3.Qe4 Bf5 4.Rxf5 gxf5
5.Qxf5 (479.394) 383

6.02 0:01 +1.81 1.Bf4 Ng4 2.Qg3 a6 3.Bxd6 axb5
4.Bxc7 Qxd5 5.Rae1 (509.357) 383

7.01 0:01 +2.06 1.Bf4 Ng4 2.Qg3 a6 3.Bxd6 axb5 4.Qf4 (597.437) 394

8.01 0:03 +1.09 1.Bf4 a6 2.a5 axb5 3.axb6 Rxa1
4.bxc7 Qxc7 5.Qxa1 Nbd7 6.Be3 h6 (1.721.078) 460

8.02 0:04 +1.49 1.a5 Ba6 2.Bxa6 Nxa6 3.Qe2 c4 4.axb6 axb6
5.Qe4 Nc5 6.Rxa8 Qxa8 7.Qh4 h5 (1.897.415) 459

9.01 0:09 +1.77 1.a5 bxa5 2.Qh4 h5 3.Be2 Ba6 4.Bxa6 Nxa6
5.Rxa5 Nb8 6.Qf4 Nd3 7.Qf3 Nxc1
8.Rxc1 (4.185.423) 456

9.06 0:09 +2.86++ 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxh2 7.Qh6 (4.326.447) 457

10.01 0:09 +2.98 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Qc8 7.Bxg4 Bxg4
8.Qh6 Nd7 9.Qh8+ (4.406.911) 460

11.01 0:15 +5.05 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 g5
4.Qxg5+ Ng6 5.Rae1 Rd7 6.Rf2 Na6
7.Bxd7 Bxd7 8.Re7 Bxa4 9.Rf1 Bb5
10.Rf3 Nc7 11.h4 Nxd5 12.Rxf7 Kxf7
13.Qxd5+ Ke8 14.Qe6+ (7.289.180) 479

12.01 1:07 +9.09 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Nh7 12.Rxf8+ Rxf8
13.Qg3 Rf6 (35.590.490) 524

13.01 1:13 +9.73 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Nh7 12.Rxf8+ Rxf8
13.Qh6 Kg8 14.Rf1 (38.232.575) 523

14.01 1:21 +9.41 1.Nxh7 Ng4 2.Qh4 Nd7 3.h3 Nf8 4.Nxf8 Qxf8
5.hxg4 Qd8 6.Bd3 Bxg4 7.Qxg4 c4
8.Bxg6 fxg6 9.f7+ Rxf7 10.Qxg6+ Rg7 (42.869.325) 526

15.01 1:29 +9.85 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Kxh7 14.Qh4+ (46.883.682) 526

16.01 1:46 +10.42 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 a5 9.Bd8 Qg7
10.Bxc7 gxh5 11.Qxh5 Qg6 12.Qh3 Na6
13.Bxb6 Qg7 14.Bxa5 (55.897.175) 525

17.01 2:27 +11.19 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Kxh7 14.Qh4+ (77.114.258) 523

18.01 4:08 +10.50 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nd7 7.Bxg4 Nf8
8.Bxh5 Nh7 9.Qg3 Qd7 10.Bh6 Kh8
11.c4 Re8 12.Rab1 Rg8 13.Bg4 Qd8
14.Qh4 (129.570.342) 521

19.01 10:18 +12.24 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Nh7 12.Rxf8+ Rxf8
13.Qh6 Kg8 14.Bf5 (313.109.605) 506

20.01 14:47 +12.52 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Nh7 12.Rxf8+ Rxf8
13.Qh6 Rg8 14.Re1 (448.703.829) 505

21.01 24:52 +13.17 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Qxf6 14.Rxf6 (757.985.727) 508

22.01 55:57 +14.34 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Qxf6 14.Rxf6 (1.688.281.694) 502

23.01 120:28 +15.35 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Nh7 12.Rxf8+ Rxf8
13.Qh6 Kg8 14.Bf5 (3.685.397.055) 509

24.01 175:51 +15.55 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Qxf6 14.Rxf6 (5.350.193.002) 507

best move: Ng5xh7 time: 294:04.047 min n/s: 510.883 nodes: 9.014.040.382

Posted: **Tue Mar 16, 2010 10:27 am**

Eelco de Groot wrote:
Marc MP wrote:[d]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - - 0 1

This one is not particularly difficult, but some engines might have difficulties with it. The best move is Nxh7! followed by Qh4+ and then Bh6-Bg7 in order to mate in h8.
I was hoping to find the mate in eight but it is probably out of reach anyway. This version finds at least Nxh7+ - but everything after this is hopelessly in disrepair and does not seem to find it, maybe this one is is also not good anymore, I was a bit too hasty trying to find Jakovenko - Kramnik and definitely blew the engine up Don't know if it can be repaired. It's a mess. But those numbers look so nice

Eelco

I think it is almost always a bad idea to change the engine's code to solve one special test position that you want to solve. It does often blow up the search tree in other positions (and in positions which are actually quiet but require a deep positional search).
I know the problem that you know there is a mate and the engine's score is extremely high but no mate score. This occurs frequently with Stockfish on my computer. Then I get something like:

18 +32.00++
19 +76.00++
20 +221.00
21 +221.00

and then it gets stuck and doesn't get to ply 22. It has probably found a mate at a glance but does not see the mate itself...

TalkChess.com

Test position: Vaisser - Genius 2

Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2

Re: Test position: Vaisser - Genius 2