Mate in 9, what could be simpler

Discussion of anything and everything relating to chess playing software and machines.

Moderators: hgm, Rebel, chrisw

Dann Corbit
Posts: 12538
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Mate in 9, what could be simpler

Post by Dann Corbit »

Chest solves it quickly. Some engines have trouble.
r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - - acn 44675735; acs 142; bm Qxd5+; ce 32750; dm 9; pv Qxd5+ Kxd5 Nf6+ Kc4 Be6+ Kb5 a6+ Ka4 b5+ Nxb5 axb5+ Kxb5 Ra5+ Kxc6 Bd5+ Kd6 Ne8#;

Houdini 6 Tactical 1 solves it instantly.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
Top
JVMerlino
Posts: 1357
Joined: Wed Mar 08, 2006 10:15 pm
Location: San Francisco, California

Re: Mate in 9, what could be simpler

Post by JVMerlino »

The King (from CM9000) also finds Mate in 9 instantly. Even Myrddin finds it in under two seconds on my old hardware. Definitely shouldn't be a hard one even for mediocre engines.
Top
User avatar
flok
Posts: 481
Joined: Tue Jul 03, 2018 10:19 am
Full name: Folkert van Heusden

Re: Mate in 9, what could be simpler

Post by flok »

woohoo! even embla finds it in less than 2 seconds! \o/
Something's odd with time under windows though

Code: Select all

E:\Embla-1.0.3-w64>embla -p initial_fen='r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - -'
go
info depth 1 seldepth 14 score cp 183 time 11 nodes 752 pv c8e6 d6b7
info depth 2 seldepth 15 score cp 183 time 27 nodes 1949 pv c8e6 d6b7 d8d7
info depth 3 seldepth 20 score cp 143 ebf 2.16 time 47 nodes 5459 pv c8e6 d6b7 d8c8 b7d6 c8d7
info depth 4 seldepth 23 score cp 219 ebf 1.09 time 25769803838 nodes 6887 pv c8e6
info depth 4 seldepth 23 score cp 479 ebf 1.78 time 96 nodes 17959 pv c8e6 d6b7 d8e8 c4b3 e6d5 c2c4
info depth 5 seldepth 23 score cp 554 ebf 2.38 time 25769803902 nodes 26078 pv c8e6
info depth 5 seldepth 23 score cp 568 ebf 1.45 time 25769803953 nodes 49347 pv c8e6 d6b7 d8e8 b7d6 e8d7 d6f5 e6d5 c4d5
info depth 6 seldepth 23 score cp 643 ebf 1.64 time 25769804008 nodes 71289 pv c8e6
info depth 6 seldepth 24 score cp 740 ebf 1.86 time 377 nodes 151694 pv c8e6 d6b7 d8c8 c4b3 g5d5 c2c4 d5b5 b3c2 b5b7 e2g4
info depth 7 seldepth 25 score cp 740 ebf 2.87 time 25769804439 nodes 332480 pv c8e6 d6b7 d8c8 c4b3 g5d5 c2c4 d5b5 b3c2 b5b7 e2g4
info depth 8 seldepth 26 score cp 728 ebf 2.23 time 25769805016 nodes 732200 pv c8e6 d6b7 d8c8 c4b3 e6d5 c2c4 c8b7 c4d5 g5d5 b3c2 f4f3
info depth 9 seldepth 27 score cp 9991 ebf 1.05 time 25769805321 nodes 929716 pv g5d5
info depth 9 seldepth 27 score cp 9991 ebf 1.33 time 25769806279 nodes 1639553 pv g5d5 c4d5 h5f6 d5c4 c8e6 c4b5 a7a6 b5a4 b7b5 d6b5 a6b5 a4b5 a8a5 b5c6 e6d5 c6d6 f6e8
info depth 10 seldepth 27 score cp 9991 ebf 3.22 time 25769808982 nodes 3685514 pv g5d5 c4d5 h5f6 d5c4 c8e6 c4b5 a7a6 b5a4 b7b5 d6b5 a6b5 a4b5 a8a5 b5c6 e6d5 c6d6 f6e8
info score cp 9991
bestmove g5d5
Top
Ras
Posts: 2487
Joined: Tue Aug 30, 2016 8:19 pm
Full name: Rasmus Althoff

Re: Mate in 9, what could be simpler

Post by Ras »

The PC version of the CT800 takes 1:16 minutes (115 million nodes) to find it - but that's because it extends checks only if they occur during the last three half-moves of a tree. Always extending solves this position easily, but would blow up the search trees during ordinary middle games on my target hardware. In mate solver mode, however, the same PC version takes only 200 ms (18 kilonodes).
Rasmus Althoff
https://www.ct800.net
Top
F. Bluemers
Posts: 868
Joined: Thu Mar 09, 2006 11:21 pm
Location: Nederland

Re: Mate in 9, what could be simpler

Post by F. Bluemers »

Dirty says there is nothing to it:
setboard r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - -
analyze
1 -1133 1 22 a5
1 3 1 48 b5+ Nxb5
1 123 1 179 Be6
1 123 1 205 Be6
2 121 3 332 Be6 Nxb7+ Kc8
2 121 3 1192 Be6 Nxb7+ Kc8
3 170 4 1700 Be6 Nxb7+ Kd7 Nc5+ Bxc5
3 170 4 3581 Be6 Nxb7+ Kd7 Nc5+ Bxc5
4 299 7 3581 Be6 Nxb7+!
4 631 7 5678 Be6 Nxb7+ Kc8 Nd6+ Kb8 Nf5
4 631 7 6703 Be6 Nxb7+ Kc8 Nd6+ Kb8 Nf5
5 631 9 7827 Be6 Nxb7+ Kc8 Nd6+ Kb8 Nf5 Qxf5
5 631 9 11047 Be6 Nxb7+ Kc8 Nd6+ Kb8 Nf5 Qxf5
6 756 10 11047 Be6!
6 849 10 16123 Be6 Nxb7+ Kc8 Nd6+ Kb8 Rxh5 Bxd5+ Kb5 Rxh5
6 849 10 20131 Be6 Nxb7+ Kc8 Nd6+ Kb8 Rxh5 Bxd5+ Kb5 Rxh5
7 786 12 24548 Be6 Nxb7+ Kc8 Nd6+ Kb8 Rxh5 Bxd5+ Kb5 Rxh5 Ka4
7 786 14 39715 Be6 Nxb7+ Kc8 Nd6+ Kb8 Rxh5 Bxd5+ Kb5 Rxh5 Ka4
8 911 15 39715 Be6!
8 989 17 62634 Be6 Nxb7+ Kc8 Nd6+ Kb8 Kb3 Qxd5+ c4 Qxd6 Ka2 e3
8 989 18 83251 Be6 Nxb7+ Kc8 Nd6+ Kb8 Kb3 Qxd5+ c4 Qxd6 Ka2 e3
9 864 20 83251 Be6?
9 849 21 112015 Be6 Nxb7+ Kc8 Kb3 Qxd5+ c4 Qb5+ Kc2 Qxb7 Bxg4 Bxg4 Qxg4+ Qd7
9 100009 25 163952 Qxd5+!
9 100009 25 167939 Qxd5+ Kxd5 Nf6+ Kc4 Be6+ Kb5 a6+ Ka4 b5+ Nxb5 axb5+ Kxb5 Ra5+ Kxc6 Bd5+ Kd6 Ne8#
Top
User avatar
MikeB
Posts: 4889
Joined: Thu Mar 09, 2006 6:34 am
Location: Pen Argyl, Pennsylvania

Re: Mate in 9, what could be simpler

Post by MikeB »

Dann Corbit wrote: ↑Fri Jul 20, 2018 7:21 am Chest solves it quickly. Some engines have trouble.
r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - - acn 44675735; acs 142; bm Qxd5+; ce 32750; dm 9; pv Qxd5+ Kxd5 Nf6+ Kc4 Be6+ Kb5 a6+ Ka4 b5+ Nxb5 axb5+ Kxb5 Ra5+ Kxc6 Bd5+ Kd6 Ne8#;

Houdini 6 Tactical 1 solves it instantly.
on very weak Pi hardware, McBrain 936 just need a few second with tactical 3 setting

Code: Select all

Mike@PicoChess:~ $ /opt/picochess/engines/armv7l/./McBrain-96
McBrain 9.6 by M. Byrne, I. Ivec, Stockfish authors and others
s threads 4
Confirmation: threads set to 4
s hash 128
Confirmation: hash set to 128
s tactical 3
Confirmation: tactical set to 3
p f r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - -
s minimal_output true
Confirmation: minimal_output set to true
g i
info depth 1 seldepth 2 multipv 1 score cp 1863 nodes 2327 nps 193916 tbhits 0 time 12 pv c8e6
info depth 2 seldepth 3 multipv 1 score cp 1991 nodes 4040 nps 252500 tbhits 0 time 16 pv c8e6 d6b7 d8e8
info depth 3 seldepth 6 multipv 1 score cp 866 nodes 10338 nps 313272 tbhits 0 time 33 pv b7b5 c4b3 g5d5 c2c4 b5c4 b3c2
info depth 4 seldepth 7 multipv 1 score cp 866 nodes 12585 nps 322692 tbhits 0 time 39 pv b7b5 c4b3 g5d5 c2c4 b5c4 b3c2 d5d6
info depth 5 seldepth 8 multipv 1 score cp 1122 nodes 20587 nps 395903 tbhits 0 time 52 pv c8e6 d1d4 c6d4 d6b7 d8e8 c4d4
info depth 6 seldepth 8 multipv 1 score cp 950 nodes 38352 nps 532666 tbhits 0 time 72 pv c8e6 d1d4 c6d4 h1h5 h8h5 d6b7 d8d7
info depth 7 seldepth 9 multipv 1 score cp 1000 nodes 56006 nps 608760 tbhits 0 time 92 pv c8e6 d1d4 c6d4 h1h5 e6d5 c4d4 h8h5 c2c3
info depth 8 seldepth 12 multipv 1 score cp 1150 nodes 98056 nps 721000 tbhits 0 time 136 pv c8e6 d1d4 c6d4 d6b7 d8c8 c4d4 g5d5 d4c3 d5e5 c3b4 a7a5 b4a4
info depth 9 seldepth 13 multipv 1 score cp 1145 nodes 260116 nps 815410 tbhits 0 time 319 pv c8e6 d1d4 c6d4 d6b7 d8c8 c4d4 g5d5 d4c3 c8b7 c3b4 d5d4 c2c4
info depth 10 seldepth 19 multipv 1 score cp 826 nodes 601809 nps 879837 tbhits 0 time 684 pv c8e6 d6b7 d8c8 c4b3 g5d5 c2c4 d5d7 b3c2 c8b7 h1h5 h8h5 c1f4 h5c5
info depth 11 seldepth 21 multipv 1 score cp 831 nodes 1094742 nps 887149 hashfull 41 tbhits 0 time 1234 pv c8e6 d6b7 d8c8 c4b3 g5d5 c2c4 d5g5 b7d6 c8c7 b3c2 c7d6 b2b4 h5g3 h1h8 a8h8 c4c5 d6c7
info depth 12 seldepth 24 multipv 1 score cp 769 nodes 1990053 nps 877448 hashfull 90 tbhits 0 time 2268 pv c8e6 d6b7 d8c8 c4b3 e6d5 c2c4 c8b7 c4d5 g5d5 b3c2 e4e3 c2b1 h5g3 h1h8 a8h8 e2g4 d5g2
info depth 13 seldepth 31 multipv 1 score mate 9 nodes 2857482 nps 888244 hashfull 151 tbhits 0 time 3217 pv g5d5 c4d5 h5f6 d5c4 c8e6 c4b5 a7a6 b5a4 b7b5 d6b5 a6b5 a4b5 a8a5 b5c6 e6d5 c6d6 f6e8
Image
Top
User avatar
Mike S.
Posts: 1480
Joined: Thu Mar 09, 2006 5:33 am

Re: Mate in 9, what could be simpler

Post by Mike S. »

Dann Corbit wrote: ↑Fri Jul 20, 2018 7:21 amHoudini 6 Tactical 1 solves it instantly.
Houdini 5 normal or Komodo 9 solve it also very quickly on my machine.

But simpler than a #9 could (?) be a #8:

[d]rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - 0 9
Try that with Stockfish :mrgreen:
Regards, Mike
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Mate in 9, what could be simpler

Post by zullil »

Mike S. wrote: ↑Mon Jul 23, 2018 2:02 pm But simpler than a #9 could (?) be a #8:

[d]rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - 0 9
Try that with Stockfish :mrgreen:
About 300,000,000 nodes. Stockfish-dev, 1 thread (deterministic search), 4 GB hash, no endgame tables:

Code: Select all

info depth 32 seldepth 46 multipv 1 score mate 8 nodes 303492961 nps 1668029 hashfull 514 tbhits 0 time 181947 pv d1h5 g6h5 c4f7 h5h4 b1d2 d6b4 c2c3 f5f4 d2f3 h4g4 e3e4 b4c3 b2c3 h6h5 h2h3
Top
BBauer
Posts: 658
Joined: Wed Mar 08, 2006 8:58 pm

Re: Mate in 9, what could be simpler

Post by BBauer »

Current stockfish on a slow laptop.

Code: Select all

FEN: rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - 0 9
 15/24	00:01	 2.318k	1.942k	-0,64	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Nb1-d2 Nb8-c6 Qd1-f3 Bd6-e7 Nd2-e4 h5-h4 O-O d7-d5 Ne4-c3 Bc8xf5 Qf3xf5 Qd8-c8
 16/24	00:01	 2.943k	1.911k	-0,46	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 h2-h4 c7-c5 d4xc5 Bd6-e5 c2-c3 d7-d5 g2-g4 Bc8xf5 g4xf5 Kg7-f7 Nb1-d2 Nb8-c6 Rh1-g1 Nc6-e7
 17/29	00:02	 4.869k	1.934k	-0,26	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Nb1-d2 Nb8-c6 Qd1-f3 Bd6-e7 h2-h4 d7-d5 g2-g4 Kg7-f8 Bf5xc8 Qd8xc8 g4xh5 Qc8-e8 Qf3xd5 Nc6-b4 Qd5-b3 Qe8-c6 O-O-O
 18/26+	00:03	 6.649k	1.954k	-0,33	Bc4-d3
 18/27+	00:03	 7.576k	1.962k	-0,17	Bc4-d3
 18/27	00:03	 7.788k	1.964k	-0,14	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Qd1-f3 Nb8-c6 Nb1-d2 Bd6-e7 h2-h4 d7-d5 g2-g4 Bc8xf5 g4xf5 Kg7-f7 Rh1-g1 Qd8-d7 O-O-O Ra8-g8 Rg1xg8 Kf7xg8 Qf3-g2+ Kg8-f8 Rd1-g1 Qd7xf5
 19/31-	00:04	 8.985k	1.966k	-0,23	Bc4-d3 Bd6-e7
 19/31-	00:04	 9.615k	1.969k	-0,29	Bc4-d3 Bd6-e7
 19/31	00:05	 10.371k	1.973k	-0,37	Bc4-d3 Bd6-e7 Qd1-g4+ Kg6-f7 Qg4-h5+ Kf7-f8 Bd3xf5 d7-d5 Bf5xc8 Qd8xc8 Nb1-c3 c7-c6 O-O Qc8-e8 Qh5-f3 Rh8-g8 e3-e4 d5xe4 Nc3xe4 Qe8-g6 Ne4-g3
 20/32+	00:05	 11.706k	1.981k	-0,30	Bc4-d3
 20/32+	00:06	 11.925k	1.977k	-0,22	Bc4-d3
 20/34	00:07	 14.937k	1.988k	-0,20	Bc4-d3 Bd6-e7 Qd1-g4+ Kg6-f7 Bd3xf5 d7-d5 Qg4-h5+ Kf7-f8 Bf5xc8 Qd8xc8 Qh5xd5 Nb8-c6 Nb1-c3 Rh8-g8 O-O-O Rg8-g5 Qd5-e4 Qc8-f5 Qe4xf5 Rg5xf5 f2-f4 Kf8-f7 a2-a3
 21/33-	00:07	 15.629k	1.989k	-0,28	Bc4-d3 Bd6-e7
 21/33-	00:08	 15.941k	1.988k	-0,35	Bc4-d3 Bd6-e7
 21/33+	00:09	 19.666k	1.994k	-0,28	Bc4-d3
 21/33	00:10	 20.366k	1.996k	-0,32	Bc4-d3 Bd6-e7 Qd1-g4+ Kg6-f7 Bd3xf5 d7-d5 Qg4-h5+ Kf7-f8 Bf5xc8 Qd8xc8 Qh5xd5 c7-c6 Qd5-b3 Rh8-g8 Nb1-c3 Rg8xg2 O-O-O c6-c5 d4xc5 Nb8-a6 Rh1-g1 Na6xc5 Qb3-d5 Rg2-g5 Rg1xg5 h6xg5
 22/34-	00:11	 23.171k	1.995k	-0,40	Bc4-d3 c7-c6
 22/36-	00:12	 24.976k	2.003k	-0,53	Bc4-d3 Bd6-b4+
 22/37+	00:14	 28.659k	2.014k	-0,40	Bc4-d3
 22/40	00:16	 33.024k	2.019k	-0,35	Bc4-d3 Bd6-b4+ c2-c3 Bb4-e7 Qd1-g4+ Kg6-f7 Bd3xf5 d7-d6 Qg4-h5+ Kf7-f8 Bf5xc8 Qd8xc8 O-O Kf8-g7 c3-c4 Qc8-e8 Qh5-f3 c7-c6 Nb1-c3 Qe8-g6 Nc3-e2 f6-f5 Ne2-f4 Qg6-g4 Nf4-e6+ Kg7-f7 Qf3xg4 f5xg4 Ne6-c7 Nb8-d7
 23/30-	00:16	 33.693k	2.020k	-0,42	Bc4-d3 Bd6-b4+
 23/37	00:17	 35.445k	2.009k	-0,37	Bc4-d3 Bd6-b4+ c2-c3 Bb4-e7 Nb1-d2 d7-d5 Nd2-f3 h6-h5 Nf3-h4+ Kg6-f7 Qd1-f3 c7-c6 O-O Qd8-g8 h2-h3 Qg8-g5 g2-g3 Nb8-a6 a2-a3 Na6-c7 Bd3xf5 Rh8-g8 Bf5xc8 Ra8xc8 Nh4-f5 Be7-f8 e3-e4
 24/33+	00:18	 36.455k	2.008k	-0,30	Bc4-d3
 24/33+	00:19	 39.546k	2.009k	-0,22	Bc4-d3
 24/35	00:24	 48.513k	2.016k	-0,30	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Qd1-f3 Nb8-c6 Nb1-d2 Qd8-e8 O-O-O Bd6-e7 h2-h4 d7-d5 g2-g4 Qe8-f7 Rd1-g1 Kg7-f8 Kc1-b1 h5xg4 Qf3xg4 Bc8xf5 Qg4xf5 Rh8-h5 Qf5-d7 Be7-d6 Qd7-g4 Nc6-e7 Qg4-d7
 25/33-	00:25	 51.564k	2.017k	-0,37	Bc4-d3 Kg6-g7
 25/33+	00:27	 54.697k	2.020k	-0,30	Bc4-d3
 25/39-	00:32	 65.975k	2.025k	-0,45	Bc4-d3 Kg6-g7
 25/40+	00:36	 74.925k	2.030k	-0,31	Bc4-d3
 25/40	00:40	 83.017k	2.029k	-0,52	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Rh1-g1 Nb8-c6 Nb1-d2 Qd8-e8 g2-g4 Kg7-f8 Nd2-e4 Nc6-e7 Ne4xd6 c7xd6 Qd1-f3 h5xg4 Bf5xg4 Qe8-f7 Qf3-f4 Qf7-g7 O-O-O Rh8-h4 Qf4-f3 f6-f5 Bg4xf5 Qg7-f7 Bf5-e4 Qf7xf3 Be4xf3
 26/34+	00:45	 92.030k	2.027k	-0,45	Bc4-d3
 26/36+	00:47	 96.102k	2.023k	-0,37	Bc4-d3
 26/36+	00:49	 100.970k	2.023k	-0,26	Bc4-d3
 26/38	00:59	 119.245k	2.020k	-0,42	Bc4-d3 Kg6-g7 Bd3xf5 h6-h5 Rh1-g1 Nb8-c6 h2-h4 Qd8-e8 g2-g4 Kg7-f8 g4-g5 Nc6-e7 Bf5-d3 f6-f5 Qd1-f3 Kf8-g7 Nb1-d2 c7-c6 O-O-O Bd6-c7 e3-e4 f5-f4 e4-e5 d7-d5 Qf3xf4 Rh8-f8 Qf4-e3 Bc8-g4 f2-f3 Bg4-f5
 27/42+	01:00	 122.204k	2.020k	-0,35	Bc4-d3
 27/42-	01:02	 127.268k	2.021k	-0,50	Bc4-d3 Kg6-g7
 27/42+	01:05	 131.798k	2.024k	-0,39	Bc4-d3
 27/42-	01:11	 144.368k	2.024k	-0,61	Bc4-d3 Kg6-g7
 27/42+	01:16	 154.072k	2.025k	-0,42	Bc4-d3
 27/46	02:45	 335.416k	2.023k	-0,64	Bc4-d3 Nb8-c6 Qd1-g4+ Kg6-f7 Qg4xf5 h6-h5 Bd3-e2 Kf7-f8 Be2xh5 Qd8-e7 c2-c3 Qe7-g7 Nb1-d2 Qg7-g5 Qf5xg5 f6xg5 Bh5-g4 Bd6-e7 Ke1-e2 d7-d5 Bg4xc8 Ra8xc8 e3-e4 d5xe4 Nd2xe4 Kf8-g7 Ra1-d1 Kg7-g6 f2-f3 b7-b6 Ke2-e3 Rc8-f8
 28/33+	02:56	 354.418k	2.011k	-0,56	Bc4-d3
 28/40+	02:58	 358.141k	2.008k	-0,49	Bc4-d3
 28/47+	03:02	 366.020k	2.006k	-0,37	Bc4-d3
 28/47	03:09	 380.346k	2.004k	-0,50	Bc4-d3 Nb8-c6 Qd1-g4+ Kg6-f7 Qg4xf5 h6-h5 Bd3-e2 Kf7-f8 Be2xh5 Qd8-e7 Bh5-e2 b7-b6 Nb1-d2 Bc8-b7 O-O-O Ra8-e8 Be2-c4 Nc6-a5 Bc4-d5 Bb7xd5 Qf5xd5 Qe7-e6 Qd5-f3 Kf8-f7 Kc1-b1 Na5-c4 Nd2xc4 Qe6xc4 h2-h4 Qc4-e6 h4-h5 Qe6-e4 Qf3xe4 Re8xe4 h5-h6
 29/45-	03:20	 401.140k	2.004k	-0,57	Bc4-d3 Bd6-e7
 29/45+	03:24	 410.245k	2.003k	-0,50	Bc4-d3
 29/45+	03:32	 424.757k	2.003k	+M8	Qd1-h5+
 29/45	03:32	 424.759k	2.003k	+M8	Qd1-h5+ Kg6xh5 Bc4-f7+ Kh5-h4 Nb1-d2 Bd6-b4 c2-c3 f5-f4 Nd2-f3+ Kh4-g4 e3-e4 Bb4xc3+ b2xc3 h6-h5 h2-h3+
 30/16	03:32	 424.762k	2.003k	+M8	Qd1-h5+ Kg6xh5 Bc4-f7+ Kh5-h4 Nb1-d2 Bd6-b4 c2-c3 f5-f4 Nd2-f3+ Kh4-g4 e3-e4 Bb4xc3+ b2xc3 h6-h5 h2-h3+
 31/16	03:32	 424.770k	2.003k	+M8	Qd1-h5+ Kg6xh5 Bc4-f7+ Kh5-h4 Nb1-d2 Bd6-b4 c2-c3 f5-f4 Nd2-f3+ Kh4-g4 e3-e4 Bb4xc3+ b2xc3 h6-h5 h2-h3+
Top
Colin-G
Posts: 191
Joined: Mon Oct 31, 2016 6:30 pm
Location: England

Re: Mate in 9, what could be simpler

Post by Colin-G »

Critter (linux engine in xboard) needs less than 18 secs on a slow computer using a single core to find the mate in 8

Code: Select all

FEN: rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ -
 16	+99.85 	10.1M  	0:17.48	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 f4 Nf3+ Kg4 e4 Bxc3+ bxc3 h5 h3#  
 16	+14.01 	10.0M  	0:17.43	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+9.19 	10.0M  	0:17.43	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+5.98 	10.0M  	0:17.43	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+3.83 	10.0M  	0:17.43	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+2.40 	10.0M  	0:17.42	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+1.45 	10.0M  	0:17.42	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+0.81 	10.0M  	0:17.42	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+0.39 	10.0M  	0:17.42	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	+0.10 	10.0M  	0:17.42	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	 -0.08 	10.0M  	0:17.40	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	 -0.21 	10.0M  	0:17.40	Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 Bxc3 bxc3 f4 Nf3+ Kg4 e4  
 16	 -0.35 	8.53M  	0:15.11	O-O Nc6 Nc3 Kg7 Qh5 Qe8 Qxf5 Qg6 Qf3 f5 Nb5 b6 Nxd6 cxd6 h4 Re8 h5 Qg5 Bd3 Rf8 Qd5 Qxh5 Qxd6 Qg5  
 16	 -0.30 	8.24M  	0:14.62	O-O Nc6 Nc3 Kg7 Qh5 Qe8 Qxf5 Qg6 Qf3 Ne7 Nb5 Nf5 g3 a6 Nxd6 Nxd6 Bd3 f5 a4  
 15	 -0.38 	6.19M  	0:11.10	O-O Nc6 Nc3 Kg7 Qh5 Qe8 Qxf5 Qg6 Qf3 Ne7 Nb5 Nf5 g3 a6 Nc3 Nh4 Qd5  
 15	 -0.42 	5.69M  	0:10.22	Bd3 Kg7 Qh5 Nc6 Bxf5 Qe8 Qg4+ Kf8 Qh4 Qf7 Nc3 Ne7 Bd3 Rg8 Qxh6+ Qg7 Qxg7+ Kxg7 g4 b6 O-O-O  
 15	 -0.37 	5.05M  	0:08.96	Bd3 Kg7 Qh5 Nc6 Bxf5 Ne7 Qg4+ Kf8 Bd3 Nc6 O-O Rg8 Qh4 Qe7 Nd2 b6 Ne4 Kg7 Nxd6 Qxd6 Qg4+ Kh8
Top

Return to “Computer Chess Club: General Topics”