Mate in 11 position for Amateurs

[Steve Maughan]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

[JVMerlino]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

[Steve Maughan]

Thanks John — I was expecting The King to do much better than this. This position is a test of how well an engine handles mate threats. Rybka is incredibly good at it.

— Steve

[Chessnut1071]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

What does the King give for 4. ... ... ?

[JVMerlino]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

What does the King give for 4. ... ... ?

4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Ra8+ 10.Kb2 Ra1 11.Kxa1 Qa7+ 12.Na2 Qxa2+ 13.Kxa2 f2 14.Bh3+ f1=Q 15.Rxf1#

[Chessnut1071]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

What does the King give for 4. ... ... ?

4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rb1 Ra1 9.Kxa1 Ra8+ 10.Kb2 Ra1 11.Kxa1 Qa7+ 12.Na2 Qxa2+ 13.Kxa2 f2 14.Bh3+ f1=Q 15.Rxf1#

thx! got the same answer; however, it took me 4,437,740,147 nodes; white: 3,666,50,804; black: 770,789,343; time: 1:47:15 from 6-ply in. I can just imagine the time from 1. QxN+

[Joerg Oster]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

The Huntsman Dev, 512 MB Hash, 1 Thread:

info depth 25 seldepth 30 multipv 1 score mate 15 nodes 13839063 nps 904691 hashfull 198 tbhits 0 time 15297 pv d3g6 h7g6 f1d3 g6h5 g3g4 h5g4 h1g1 g4h3 d3f1 h3h2 f2g3 h2g1 a5a1 b8a8 a1b1 a8a1 b2a1 g8a8 a1b2 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 f6g5 f1h3 g5c1 b1c1
bestmove d3g6 ponder h7g6

[Steve Maughan]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

The Huntsman Dev, 512 MB Hash, 1 Thread:

info depth 25 seldepth 30 multipv 1 score mate 15 nodes 13839063 nps 904691 hashfull 198 tbhits 0 time 15297 pv d3g6 h7g6 f1d3 g6h5 g3g4 h5g4 h1g1 g4h3 d3f1 h3h2 f2g3 h2g1 a5a1 b8a8 a1b1 a8a1 b2a1 g8a8 a1b2 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 f6g5 f1h3 g5c1 b1c1
bestmove d3g6 ponder h7g6

Impressive! How does The Huntsman handle threats and evading checks?

— Steve

[Joerg Oster]

@John Merlino — can you do me a favor and see how The King handles the following position. Qxg6+ is mate in 15, but Stockfish and many other engines struggle:

[fen]1r4r1/3q1npk/2b1pbnp/Rp1p4/1N1P3P/2PQ1pP1/1K3B2/5B1R w - -[/fen]

— Steve

Yeah, The King has a tough time as well. If I force the first six ply (1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4), then The King announces Mate in 12 in 1:52. I imagine from the initial position it would take more than an hour.

The Huntsman Dev, 512 MB Hash, 1 Thread:

info depth 25 seldepth 30 multipv 1 score mate 15 nodes 13839063 nps 904691 hashfull 198 tbhits 0 time 15297 pv d3g6 h7g6 f1d3 g6h5 g3g4 h5g4 h1g1 g4h3 d3f1 h3h2 f2g3 h2g1 a5a1 b8a8 a1b1 a8a1 b2a1 g8a8 a1b2 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 f6g5 f1h3 g5c1 b1c1
bestmove d3g6 ponder h7g6

Impressive! How does The Huntsman handle threats and evading checks?

— Steve

Version 1 is even faster.

info depth 24 seldepth 30 multipv 1 score mate 15 nodes 2416786 nps 741572 hashfull 36 tbhits 0 time 3259 pv d3g6 h7g6 f1d3 g6h5 g3g4 h5g4 h1g1 g4h3 d3f1 h3h2 f2g3 h2g1 a5a1 b8a8 a1b1 a8a1 b1a1 d7a7 a1b1 a7a1 b2a1 g8a8 a1b2 a8a1 b1a1 f3f2 f1h3 f2f1n a1f1
bestmove d3g6 ponder h7g6

For details see https://github.com/joergoster/Stockfish ... ses/tag/h1 and https://github.com/joergoster/Stockfish ... e/huntsman