Can any engine find the winning move here ?

[peter]

... snip
and it does now appear that Kg7 may offer stiffer resistance as it delays mate by one move ( Nf6 Kg7 Kh7 Nh5! - now Kg7 leads to shorter mate and Bc2 will mate.
Perhaps this was the reason why van Breukelen delayed publishing it for so long? So technically it's a mate-in-14 ( hopefully I'm correct in saying that since I'm getting old)

After 1...Kg7 it's not mate-in-14 but mate in 32!
2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8=Q Kg4! 5.Qf6! (# in 28) Kxg3 6.Qe5+ Kf3 7.Bd1+ Kg2 8.Qd5+ Kg1 9.Qc4 (# in24)

[d]8/8/n2K3p/2pQ2n1/1b6/2p1p3/8/3B2k1 w - - 0 9
(after 8.Qd5+ Kg1)
9.Qc4 (# in24)

#32 (or shorter) could be right, even I can reproduce only #33 so far. From your line deviating with 8...Kg3 instead of your ...Kg1, it's getting 35 moves all in all in my database, so I have 8.Qxe3 instead of your 8.Qd5 there with 2 moves less again.
Here's the shortest output- line I have so far at the position after 4...Kg4:

[d]3Q4/8/n2K3p/2p3n1/1b4k1/2p1p1P1/2B5/8 w - - 0 1
Analysis by Stockfish-MOJO 281120:

5.Qf6 Kxg3 6.Qe5+ Kf3 7.Bd1+ Kg2 8.Qxe3 c4+ 9.Kd5 Bc5 10.Qxc3 Nc7+ 11.Kxc4 Nce6 12.Qf6 Be3 13.Qxh6 Kg3 14.Qg6 Bc1 15.Qf5 Bf4 16.Bh5 Bc1 17.Qd3+ Kf4 18.Qf1+ Ke5 19.Qxc1 Ne4 20.Qe3 Kf5 21.Bd1 N4g5 22.Bc2+ Kg4 23.Bg6 Nd8 24.Qd4+ Kg3 25.Qxd8 Ne6 26.Qd3+ Kf4 27.Qf5+ Ke3 28.Qxe6+ Kf3 29.Kd4 Kf2 30.Qe3+ Kf1 31.Qf3+ Ke1 32.Bh5 Kd2 33.Qd1#
+- (#29) Depth: 59/57 00:31:35 34686MN

[MikeB]

... snip
and it does now appear that Kg7 may offer stiffer resistance as it delays mate by one move ( Nf6 Kg7 Kh7 Nh5! - now Kg7 leads to shorter mate and Bc2 will mate.
Perhaps this was the reason why van Breukelen delayed publishing it for so long? So technically it's a mate-in-14 ( hopefully I'm correct in saying that since I'm getting old)

After 1...Kg7 it's not mate-in-14 but mate in 32!
2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8=Q Kg4! 5.Qf6! (# in 28) Kxg3 6.Qe5+ Kf3 7.Bd1+ Kg2 8.Qd5+ Kg1 9.Qc4 (# in24)

[d]8/8/n2K3p/2pQ2n1/1b6/2p1p3/8/3B2k1 w - - 0 9
(after 8.Qd5+ Kg1)
9.Qc4 (# in24)

wow - did not expect that ->M32. I appreciate your analysis! (and Peter's too!)

[peter]

Here's the shortest output- line I have so far at the position after 4...Kg4:

[d]3Q4/8/n2K3p/2p3n1/1b4k1/2p1p1P1/2B5/8 w - - 0 1
Analysis by Stockfish-MOJO 281120:

5.Qf6 Kxg3 6.Qe5+ Kf3 7.Bd1+ Kg2 8.Qxe3 c4+ 9.Kd5 Bc5 10.Qxc3 Nc7+ 11.Kxc4 Nce6 12.Qf6 Be3 13.Qxh6 Kg3 14.Qg6 Bc1 15.Qf5 Bf4 16.Bh5 Bc1 17.Qd3+ Kf4 18.Qf1+ Ke5 19.Qxc1 Ne4 20.Qe3 Kf5 21.Bd1 N4g5 22.Bc2+ Kg4 23.Bg6 Nd8 24.Qd4+ Kg3 25.Qxd8 Ne6 26.Qd3+ Kf4 27.Qf5+ Ke3 28.Qxe6+ Kf3 29.Kd4 Kf2 30.Qe3+ Kf1 31.Qf3+ Ke1 32.Bh5 Kd2 33.Qd1#
+- (#29) Depth: 59/57 00:31:35 34686MN

Having found a #31- line here:

http://talkchess.com/forum3/viewtopic.p ... 01#p831001

that I went back till my deviation of Black's at 6...Kf3 instead of ...Kf2 there, which added one move again, so yet I now have a #32 all in all in output after
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1
1. Nf6+ Kg7 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Kg4

3Q4/8/n2K3p/2p3n1/1b4k1/2p1p1P1/2B5/8 w - - 0 1

Analysis by HekaStockfishNNUE 280920:

5.Qf6 Kxg3 6.Qe5+ Kf3 7.Bd1+ Kg2 8.Qd5+ Kg1 9.Qc4 c2 10.Qg4+ Kh2 11.Qe2+ Kg1 12.Qxe3+ Kg2 13.Bxc2 c4+ 14.Kd5 Bc5 15.Be4+ Kf1 16.Qf4+ Ke1 17.Kxc4 Nxe4 18.Qxe4+ Kd2 19.Qc6 Bf2 20.Qxa6 Ke3 21.Qe6+ Kf4 22.Kd3 Bh4 23.Qe4+ Kg5 24.Qe5+ Kg6 25.Ke4 Bd8 26.Qf5+ Kg7 27.Ke5 h5 28.Ke6 Bh4 29.Qf7+ Kh8 30.Qg6 Bg5 31.Kf7 Bh6 32.Qxh6#
+- (#28) Depth: 73/56 06:26:18 547425MN

[Chessqueen]

Since certain people with super fast computer and very good engine such as the Black-Diamond13.1 are very good at solving mate, I will like to include these two puzzles where white force a mate

[d]QN4n1/6r1/3k4/8/b2K4/8/8/8 w - - 0 1

And if your computer and great engine can solve the previous one then try solve this next, which I call the mother of all the puzzles

[d]1n1k4/6Q1/5KP1/8/7b/1r6/8/8 w - - 0 1

[Chessqueen]

Please do NOT cheat, 7 men EGTB NOT allowed, only pure calculating power

[mhouppin]

Since certain people with super fast computer and very good engine such as the Black-Diamond13.1 are very good at solving mate, I will like to include these two puzzles where white force a mate

[d]QN4n1/6r1/3k4/8/b2K4/8/8/8 w - - 0 1

And if your computer and great engine can solve the previous one then try solve this next, which I call the mother of all the puzzles

[d]1n1k4/6Q1/5KP1/8/7b/1r6/8/8 w - - 0 1

I don't have insane hardware, or an insane engine, but Stash v29.15 doesn't do too bad here (I don't know if the mate is minimal):

Code: Select all

FEN: QN4n1/6r1/3k4/8/b2K4/8/8/8 w - - 0 1

Stash v29.15:
 1/1	00:00	 24	24k	+6,74	1.Qxa4
 2/3	00:00	 145	145k	+2,53	1.Qd5+ Kc7
 3/4	00:00	 305	305k	+1,98	1.Qd5+ Ke7 2.Qf3
 4/5	00:00	 636	636k	+2,07	1.Qd5+ Ke7 2.Qc5+ Kd8 3.Qc4
 5/7	00:00	 2k	1 654k	+2,01	1.Qd5+ Ke7 2.Qc5+ Kf6 3.Qb6+ Kf7 4.Nc6
 6/9	00:00	 4k	2 156k	+1,78	1.Qd5+ Ke7 2.Kc5 Rg6 3.Qf5 Rf6
 7/12	00:00	 14k	2 060k	+6,27	1.Qe4 Re7 2.Qg6+ Kc7 3.Qxg8 Re8 4.Qc4+ Kd6 5.Qxa4
 8/10	00:00	 16k	2 270k	+6,27	1.Qe4 Re7 2.Qd5+ Kc7 3.Qxg8 Re8 4.Qc4+ Kd6 5.Qxa4 Rxb8
 9/12	00:00	 17k	2 178k	+6,31	1.Qe4 Re7 2.Qd5+ Kc7 3.Qxg8 Kb7 4.Qc4 Kxb8 5.Qb4+ Rb7 6.Qxa4
 10/14	00:00	 20k	2 167k	+6,31	1.Qe4 Re7 2.Qd5+ Kc7 3.Qxg8 Kb7 4.Qf8 Rc7 5.Qb4+ Ka7 6.Qxa4+ Kxb8 7.Qa6
 11/18	00:00	 35k	2 189k	+6,39	1.Qe4 Re7 2.Qd5+ Kc7 3.Qxg8 Re8 4.Qc4+ Kxb8 5.Qxa4 Re7 6.Qb4+ Rb7 7.Qc5 Rc7 8.Qb5+ Kc8 9.Qe8+ Kb7
 12/18	00:00	 53k	2 321k	+6,49	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re1 7.Qd5+ Kb6 8.Qd8+ Kc6 9.Qf6+ Kc7
 13/24	00:00	 72k	2 330k	+6,71	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qxg8 Re1 6.Qb3+ Bb5 7.Qb4 Rd1+ 8.Ke5 Kc6 9.Kf4 Rg1
 14/23	00:00	 106k	2 299k	+6,95	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re2 7.Qd5+ Kb6 8.Qd8+ Kc6 9.Qa5 Rc2 10.Qa8+ Kb6 11.Qd8+ Kc6
 15/28	00:00	 138k	2 371k	+6,95	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re2 7.Qd5+ Kb6 8.Qd8+ Kc6 9.Qa5 Re8 10.Ne4 Rh8 11.Qc3+ Kb7 12.Qc5 Ka6
 16/33	00:00	 234k	2 335k	+7,10	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re2 7.Qd5+ Kb6 8.Qd8+ Kc6 9.Qa5 Re8 10.Ne4 Rh8 11.Qc3+ Kb7 12.Qc5 Rd8+ 13.Ke5
 17/32	00:00	 350k	2 398k	+7,19	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re2 7.Qd5+ Kb6 8.Qd8+ Kc6 9.Qa5 Re8 10.Ne4 Rh8 11.Qc3+ Kb6 12.Qc5+ Ka6 13.Nd6 Rh4+ 14.Ke3 Ba4 15.Kf3
 18/35	00:00	 1 098k	2 500k	+7,66	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bb5 5.Qd8+ Kc6 6.Qxg8 Re2 7.Qd5+ Kb6 8.Kc3 Re1 9.Qd6+ Bc6 10.Kd2 Re8 11.Ne6 Rc8 12.Qb4+ Ka6 13.Nc5+ Ka7 14.Qa5+ Kb8 15.Qb6+ Ka8
 19/40	00:00	 1 553k	2 557k	+7,50	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qa5+ Kb8 7.Qb6+ Bb7 8.Qd8+ Ka7 9.Qxg8 Rc7 10.Qd8 Rh7 11.Qa5+ Kb8 12.Qb6 Kc8 13.Ke5 Bf3 14.Kf4 Rh3 15.Qd6
 20/36	00:00	 1 745k	2 577k	+7,69	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qa5+ Kb8 7.Qb6+ Bb7 8.Qd8+ Ka7 9.Qxg8 Rc7 10.Qd8 Rf7 11.Qa5+ Kb8 12.Qb5 Rh7 13.Kc4 Ka7 14.Qa5+ Kb8 15.Qd8+ Ka7 16.Kb4 Bf3
 21/39	00:00	 2 306k	2 599k	+7,82	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Kc3 Rc8 9.Qa6+ Kb8 10.Qb6+ Ka8 11.Kd3 Bh1 12.Kd4 Bg2 13.Qa6+ Kb8 14.Qb5+ Ka8 15.Ke5 Rh8 16.Qa6+ Kb8 17.Qb6+ Ka8
 22/42	00:01	 3 637k	2 698k	+8,37	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Kb6 8.Qb4+ Bb5 9.Nd7+ Kc6 10.Ne5+ Rxe5 11.Kxe5 Ba6 12.Qd6+ Kb5 13.Kd4 Bb7 14.Qd7+ Kb6 15.Qd8+ Kb5 16.Qe8+ Kb6 17.Qb8 Kc6 18.Qd8
 23/46	00:01	 5 566k	2 804k	+8,87	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Kc3 Kb6 9.Qa6+ Kxc5 10.Qa5+ Kd6 11.Qxd8+ Bd7 12.Kd4 Kc6 13.Qf6+ Kb5 14.Qe5+ Kc6 15.Qd5+ Kc7 16.Qc5+ Kb7 17.Qd6 Bc6 18.Kc5 Bg2 19.Qe7+ Kc8 20.Kb6 Kb8
 24/44	00:02	 6 427k	2 831k	+9,02	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re1 7.Qa2+ Kb8 8.Qb3+ Kc8 9.Qh3+ Kd8 10.Qh4+ Re7 11.Qf6 Bd7 12.Qd6 Ke8 13.Qg6+ Kd8 14.Qf6 Bg4 15.Qh8+ Kc7 16.Qf8 Rd7+ 17.Nxd7 Bxd7 18.Qc5+ Kb7 19.Qd6
 25/44+	00:03	 9 234k	2 865k	+9,50	1.Qe4
 25/44	00:03	 9 941k	2 878k	+9,54	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb8 9.Qb4+ Kc8 10.Qb6 Rd5+ 11.Kf4 Rxc5 12.Qxc5 Kd7 13.Ke5 Kc7 14.Qd6+ Kb7 15.Kd4 Bf3 16.Qe7+ Kb6 17.Qc5+ Kb7 18.Qd6 Bc6 19.Kc5 Bh1 20.Qe7+ Kc8 21.Qd6
 26/42+	00:03	 11 220k	2 880k	+9,69	1.Qe4
 26/45+	00:04	 12 217k	2 883k	+9,84	1.Qe4
 26/45+	00:07	 21 196k	2 834k	+10,84	1.Qe4
 26/47	00:09	 26 319k	2 778k	+11,21	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re1 7.Qa2+ Kb8 8.Qb3+ Kc8 9.Na6 Ra1 10.Qb8+ Kd7 11.Nc5+ Ke7 12.Qc7+ Kf6 13.Qxc6+ Kg7 14.Ne4 Rf1 15.Qe6 Rd1+ 16.Kc4 Rf1 17.Qe7+ Kg6 18.Qg5+ Kf7 19.Kd4 Kf8 20.Nd6 Rf2 21.Ke5 Rf1
 27/59	00:11	 31 857k	2 781k	+11,56	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re1 7.Qa2+ Kb8 8.Qb3+ Kc8 9.Na6 Ra1 10.Qb8+ Kd7 11.Nc5+ Ke7 12.Qc7+ Kf6 13.Qxc6+ Kg7 14.Ne4 Rf1 15.Qe6 Rd1+ 16.Kc4 Rc1+ 17.Kd3 Rf1 18.Qe7+ Rf7 19.Qg5+ Kf8 20.Qh6+ Rg7 21.Qd6+ Kf7 22.Qd5+ Ke7 23.Qe5+ Kf8 24.Ng5 Rd7+ 25.Kc2 Rb7 26.Qf6+ Kg8
 28/68	00:27	 82 294k	2 948k	+110,14	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb6 9.Qb4+ Bb5 10.Nb3 Re8+ 11.Kf4 Rb8 12.Nd4 Rb7 13.Nxb5 Kc6 14.Nd4+ Kc7 15.Ne6+ Kb8 16.Qd6+ Ka7 17.Nc5 Rb4+ 18.Ke3 Rb2 19.Qd7+ Kb8 20.Qd8+ Ka7 21.Qd4 Rb5 22.Qa4+ Kb6 23.Nd7+ Kc6
 29/62	00:33	 100 910k	2 986k	+110,52	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re1 7.Qa2+ Kb8 8.Qb3+ Kc8 9.Na6 Re4+ 10.Kc5 Bb7 11.Qb6 Re7 12.Qd6 Rf7 13.Qb8+ Kd7 14.Qxb7+ Ke6 15.Nc7+ Ke7 16.Qe4+ Kf8 17.Ne6+ Ke8 18.Ng5+ Re7 19.Qg6+ Kd7 20.Qd6+ Ke8 21.Qc6+ Kf8 22.Qf6+ Ke8 23.Ne6 Kd7 24.Kd5 Re8 25.Qf7+ Re7 26.Nc5+ Kd8 27.Qf6 Ke8 28.Kd4
 30/70	00:38	 116 189k	3 020k	+110,26	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb6 9.Qb4+ Bb5 10.Nb3 Re8+ 11.Kf4 Rb8 12.Nd4 Rb7 13.Nxb5 Kc6 14.Nd4+ Kc7 15.Ne6+ Kb8 16.Qd6+ Ka8 17.Qa6+ Kb8 18.Nc5 Rh7 19.Qb5+ Ka7 20.Kg5 Ka8 21.Qc6+ Kb8 22.Nd7+ Ka7
 31/60	00:41	 126 249k	3 047k	+117,20	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb6 9.Qb4+ Bb5 10.Nb3 Re8+ 11.Kf4 Rc8 12.Qa5+ Kc6 13.Nd4+ Kd5 14.Nxb5 Rf8+ 15.Ke3 Ke6 16.Nd4+ Kf7 17.Qf5+ Kg8 18.Qg6+ Kh8 19.Qh6+ Kg8 20.Ne6 Rf7 21.Qg6+ Kh8 22.Qh5+ Kg8 23.Qg4+ Kh8 24.Qh4+ Kg8 25.Qg3+ Kh8 26.Qh2+ Kg8 27.Qb8+ Kh7 28.Ng5+ Kh6
 32/66	00:47	 146 497k	3 103k	+117,20	1.Qe4 Rg5 2.Qf4+ Ke6 3.Qxg5 Ne7 4.Kc5 Nf5 5.Qf4 Bb3 6.Qf3 Kf6 7.Qxb3 Kg5 8.Qd5 Kf4 9.Nd7 Ng3 10.Qd4+ Kf5 11.Qf2+ Kg4 12.Ne5+ Kh3 13.Qf3 Kh2 14.Qg4 Kg2 15.Kd4 Kh2 16.Nf3+ Kg2 17.Kc5 Kf2 18.Nd4 Nf1 19.Qf3+ Kg1
 33/66	00:53	 169 379k	3 171k	+M170	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb6 9.Qb4+ Bb5 10.Nb3 Rh8 11.Qa5+ Kc6 12.Nd4+ Kb7 13.Qxb5+ Ka8 14.Qa6+ Kb8 15.Qb6+ Kc8 16.Qc6+ Kb8 17.Ne6 Rh5+ 18.Kd4 Ka7 19.Nc5 Rh4+ 20.Ke3 Rh3+ 21.Kf4 Rh4+ 22.Kg5 Rh7 23.Qa4+ Kb8 24.Nd7+ Kc7 25.Qc2+ Kd6 26.Qxh7 Kd5 27.Kf4 Kc6 28.Qe4+ Kb5 29.Qb7+ Kc4 30.Qb2
 34/73	01:00	 193 999k	3 195k	+M135	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re1 7.Qa2+ Kb8 8.Qb3+ Kc8 9.Na6 Ra1 10.Qb6 Kd7 11.Nc5+ Ke7 12.Qxc6 Rd1+ 13.Ke3 Re1+ 14.Kf2 Rd1 15.Qe6+ Kd8 16.Qf6+ Kc7 17.Qf4+ Kb6 18.Qb4+ Kc7 19.Ne6+ Kc8 20.Qf8+ Kb7 21.Qf3+ Ka7 22.Qxd1 Kb7 23.Qd5+ Kb6 24.Nc5 Ka5 25.Ke3 Kb5 26.Qb7+ Kc4 27.Kf4
 35/70	01:08	 224 769k	3 265k	+M76	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qd8+ Ka7 6.Qxg8 Re8 7.Qc4 Rd8+ 8.Ke5 Kb6 9.Qb4+ Bb5 10.Nb3 Re8+ 11.Kf4 Rb8 12.Nd4 Ka6 13.Qa3+ Kb6 14.Nxb5 Rb7 15.Qb4 Kc6 16.Qc4+ Kb6 17.Nd6 Rh7 18.Qb3+ Ka6 19.Qa2+ Kb6 20.Qb1+ Ka6 21.Qxh7 Ka5 22.Qg7 Kb6 23.Qb7+ Kc5 24.Qe4 Kb6
 36/68	01:16	 253 513k	3 325k	+M38	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kg8 16.Qg6+ Kf8 17.Qf6+ Kg8 18.Ne6 Ra7 19.Kc5 Rb7 20.Qg6+ Kh8 21.Qh6+ Kg8 22.Qg5+ Kh7 23.Qh4+ Kg8 24.Qg3+ Kh7 25.Qh2+ Kg6 26.Qg2+ Kf6 27.Qxb7 Kxe6 28.Kd4 Kf6 29.Qd7 Kg5 30.Ke3 Kg6 31.Qd1
 37/78	01:22	 277 836k	3 364k	+M33	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kg8 16.Qf6 Ra3 17.Ne6 Ra7 18.Kc5 Rb7 19.Qf8+ Kh7 20.Qf3 Ra7 21.Qh5+ Kg8 22.Qe8+ Kh7 23.Kb6 Rg7 24.Nxg7 Kxg7 25.Qe5+ Kg6 26.Kc5 Kh6 27.Qf6+ Kh5 28.Qg7 Kh4 29.Kd4 Kh3 30.Ke4 Kh2 31.Qg4 Kh1
 38/68	01:26	 293 800k	3 377k	+M33	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kg8 16.Qf6 Ra3 17.Ne6 Ra7 18.Kc5 Rb7 19.Qf8+ Kh7 20.Qf3 Ra7 21.Qh5+ Kg8 22.Qe8+ Kh7 23.Kb6 Rg7 24.Nxg7 Kxg7 25.Qe5+ Kg6 26.Kc5 Kh7 27.Qf6 Kg8 28.Qg5+ Kh7 29.Kd5 Kh8 30.Ke5 Kh7 31.Kf5 Kh8 32.Kf6
 39/76	01:33	 315 501k	3 387k	+M36	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re8 8.Qc4 Rd8+ 9.Ke5 Kb6 10.Qb4+ Bb5 11.Nb3 Re8+ 12.Kf4 Rb8 13.Nd4 Ka6 14.Qa3+ Kb6 15.Nxb5 Rb7 16.Qb4 Kc6 17.Qc4+ Kb6 18.Nd6 Rc7 19.Qb5+ Ka7 20.Qa5+ Kb8 21.Qb4+ Ka8 22.Qa4+ Kb8 23.Qe8+ Ka7 24.Nb5+ Ka6 25.Nxc7+ Kb6 26.Qb5+ Kxc7 27.Qc5+ Kb8 28.Qd6+ Kb7 29.Ke3 Ka7 30.Qc7+ Ka8 31.Qf7
 40/68	01:42	 349 622k	3 403k	+M33	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re8 8.Qc4 Rd8+ 9.Ke5 Kb6 10.Qb4+ Bb5 11.Nb3 Re8+ 12.Kf4 Rb8 13.Nd4 Ka6 14.Qa3+ Kb6 15.Nxb5 Rb7 16.Qb4 Kc6 17.Qc4+ Kb6 18.Nd6 Rc7 19.Qb5+ Ka7 20.Qa5+ Kb8 21.Qb4+ Ka8 22.Qa4+ Kb8 23.Qe8+ Ka7 24.Nb5+ Ka6 25.Nxc7+ Kb6 26.Qb8+ Kc5 27.Qb5+ Kd6 28.Nd5 Ke6 29.Qc6+ Kf7 30.Qf6+ Kg8 31.Ne7+ Kh7 32.Qg6+ Kh8 33.Qh6+
 41/76	02:08	 459 221k	3 560k	+M29	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kh6 16.Qf6+ Kh7 17.Ne6 Ra7 18.Kc5 Kg8 19.Qg6+ Kh8 20.Qe8+ Kh7 21.Kb6 Rg7 22.Qh5+ Kg8 23.Nxg7 Kxg7 24.Qg5+ Kf7 25.Kc5 Kf8 26.Kc6 Kf7 27.Kd6 Kf8 28.Ke6 Ke8 29.Qe7+
 42/58	02:14	 480 005k	3 558k	+M29	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kh6 16.Qf6+ Kh7 17.Ne6 Ra7 18.Kc5 Kg8 19.Qg6+ Kh8 20.Qe8+ Kh7 21.Kb6 Rg7 22.Qh5+ Kg8 23.Nxg7 Kxg7 24.Qg5+ Kf7 25.Kc5 Kf8 26.Kc6 Kf7 27.Kd6 Kf8 28.Ke6 Ke8 29.Qe7+
 43/58	02:29	 527 446k	3 539k	+M29	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Qf5 Kh6 16.Qf6+ Kh7 17.Ne6 Ra7 18.Kc5 Kg8 19.Qg6+ Kh8 20.Qe8+ Kh7 21.Kb6 Rg7 22.Qh5+ Kg8 23.Nxg7 Kxg7 24.Qg5+ Kf7 25.Kc5 Ke6 26.Kc6 Kf7 27.Kd6 Kf8 28.Ke6 Ke8 29.Qe7+
 44/58	02:45	 582 532k	3 527k	+M27	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Kd7 12.Nc5+ Ke7 13.Qxc6 Kf7 14.Qe6+ Kg7 15.Ne4 Kf8 16.Qf6+ Kg8 17.Ke5 Ra5+ 18.Kf4 Ra7 19.Qd8+ Kg7 20.Qd4+ Kf7 21.Qxa7+ Ke6 22.Ke3 Kd5 23.Qa6 Ke5 24.Qd6+ Kf5 25.Qf6+ Kg4 26.Qg5+ Kh3 27.Qg3+
 45/58	03:22	 731 646k	3 605k	+M25	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Rd1+ 12.Ke3 Kd7 13.Qc7+ Ke8 14.Qxc6+ Ke7 15.Qe4+ Kd6 16.Qb4+ Ke5 17.Qf4+ Ke6 18.Qg4+ Ke7 19.Qxd1 Kf6 20.Qd7 Kg6 21.Nc5 Kf6 22.Kf4 Kg6 23.Ne4 Kh6 24.Kf5 Kh5 25.Qh7+
 46/50	03:41	 799 388k	3 613k	+M25	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Be8 5.Qa8 Bc6 6.Qd8+ Ka7 7.Qxg8 Re1 8.Qa2+ Kb8 9.Qb3+ Kc8 10.Na6 Ra1 11.Qb6 Rd1+ 12.Ke3 Kd7 13.Qc7+ Ke8 14.Qxc6+ Ke7 15.Qe4+ Kd6 16.Qb4+ Ke5 17.Qf4+ Ke6 18.Qg4+ Kf7 19.Qxd1 Ke7 20.Nc5 Kf7 21.Qd7+ Kg6 22.Ne4 Kh6 23.Kf4 Kg6 24.Ng5 Kh5 25.Qh7+
 47/50	07:34	 1 704 298k	3 750k	+M21	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qxg8 Re8 6.Qb3+ Bb5 7.Nd7+ Ka6 8.Qa3+ Kb7 9.Qb4 Kc6 10.Ne5+ Kb6 11.Nc4+ Kc7 12.Qxb5 Re2 13.Qb6+ Kc8 14.Nd6+ Kd7 15.Qb5+ Kc7 16.Qxe2 Kxd6 17.Qe8 Kc7 18.Kc5 Kb7 19.Qe7+ Kb8 20.Kc6 Kc8 21.Qf8+
 48/42	07:54	 1 781 355k	3 752k	+M21	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qxg8 Re8 6.Qb3+ Kc7 7.Na6+ Kd6 8.Qg3+ Ke7 9.Qg7+ Kd6 10.Qc7+ Ke6 11.Nc5+ Kf6 12.Qxc6+ Kf7 13.Nd7 Re7 14.Qd5+ Kg6 15.Qd6+ Kf5 16.Qxe7 Kf4 17.Ne5 Kg3 18.Qg7+ Kh2 19.Ke3 Kh1 20.Kf3 Kh2 21.Qg2+
 49/42	08:12	 1 844 291k	3 746k	+M21	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qxg8 Re8 6.Qb3+ Kc7 7.Na6+ Kd6 8.Qg3+ Ke7 9.Qg7+ Kd6 10.Qc7+ Ke6 11.Nc5+ Kf6 12.Qxc6+ Kf7 13.Nd7 Re7 14.Qd5+ Kg6 15.Qd6+ Kf5 16.Qxe7 Kf4 17.Ne5 Kg3 18.Qg7+ Kh2 19.Ke3 Kh1 20.Kf3 Kh2 21.Qg2+
 50/42	08:39	 1 941 112k	3 738k	+M21	1.Qe4 Re7 2.Qd5+ Kc7 3.Na6+ Kb6 4.Nc5 Bc6 5.Qxg8 Re8 6.Qb3+ Kc7 7.Na6+ Kd6 8.Qg3+ Ke7 9.Qg7+ Kd6 10.Qc7+ Ke6 11.Nc5+ Kf6 12.Qxc6+ Kf7 13.Nd7 Re7 14.Qd5+ Kg6 15.Qd6+ Kf5 16.Qxe7 Kf4 17.Ne5 Kg3 18.Qg7+ Kh2 19.Ke3 Kh1 20.Kf3 Kh2 21.Qg2+

(p.s.: I didn't analyze the second position, since it is a draw.)

[mhouppin]

Took Stash a bit longer (1 thread, 8 GB hash), but it now says mate in 19:

Code: Select all

 53/38	15:57	 3 655 396k	3 816k	+M19	1.Qe4 Re7 2.Qd5+ Kc7 3.Qxg8 Re8 4.Na6+ Kb6 5.Qc4 Rd8+ 6.Kc3 Ra8 7.Nb4 Kb7 8.Qf7+ Kb6 9.Qe6+ Kb7 10.Qe7+ Kb6 11.Nd5+ Kc6 12.Kd4 Rc8 13.Qe6+ Kb7 14.Qb6+ Ka8 15.Nc7+ Rxc7 16.Qxc7 Bc2 17.Kc5 Bd3 18.Kb6 Ba6 19.Qa7+

[cc2150dx]

2nd Position "This is a cursed win. Mate can be forced, but a draw can be achieved under the fifty-move rule." :p

[Chessqueen]

2nd Position "This is a cursed win. Mate can be forced, but a draw can be achieved under the fifty-move rule." :p

Sorry the 1st position Black is to move first, but White has to Mate, NOT Black
[d]QN4n1/6r1/3k4/8/b2K4/8/8/8 b - - 0 1

Also, forget about applying the 50 moves rule, simply tell your computer to find the Mate. This another hard position, Black to move and mate, Sorry
[d]8/r6n/8/8/5k2/3K4/7N/3b3Q b - - 0 1

[mhouppin]

Sorry the 1st position Black is to move first, but White has to Mate, NOT Black
[d]QN4n1/6r1/3k4/8/b2K4/8/8/8 b - - 0 1

This is not a mate for White, this is a cursed win. Also, you're asking to find a mate from the losing point of view, which doesn't make any sense at all...

Also, forget about applying the 50 moves rule,

This is not how chess works.

simply tell your computer to find the Mate. This another hard position, Black to move and mate, Sorry
[d]8/r6n/8/8/5k2/3K4/7N/3b3Q b - - 0 1

Even assuming someone actually wants to run the given position (which I doubt) with 50-MR disabled, are you so misinformed that you think a strong hardware configuration can make an engine run at depths above 1000 and announce mate ? I'm not even sure any 3000+ Elo engine can reach this depth code-wise (e.g. Stash stops after depth 240). To me this looks like outright trolling.