A Little Surprise from The King

[JVMerlino]

So I was enjoying one of agadmator's excellent chess videos - Rodzynski v Alekhine, 1913.
https://www.youtube.com/watch?v=zJU1whqM8yM

Here's the game:
[pgn]1. e4 e5 2. Nf3 d6 3. Bc4 Nc6 4. c3 Bg4 5. Qb3 Qd7 6. Ng5 Nh6 7. Bxf7 Nxf7 8. Nxf7 Qxf7 9. Qxb7 Kd7 10. Qxa8 Qc4 11. f3 Bxf3 12. gxf3 Nd4 13. d3 Qxd3 14. cxd4 Be7 15. Qxh8 Bh4#[/pgn]

I was playing around with some possible escapes for White's King (using Chessmater 9000 as I always like to feel the nostalgia) and came up with this position if White played 15.Kf2:
[d]Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15

And The King announced Mate in 15 in less than one second:

Code: Select all

Time	Depth	Score	Positions	Moves
0:00	1/3	-2.65	920		15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 Rf8
0:00	1/4	-2.47	3161		15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 c6
					18.Ne2
0:00	1/4	-2.76	6357		15...Rxa8 16.Nd2 exd4 17.Rg1 Qe3+
					18.Kf1
0:00	1/5	-2.90	16626		15...Rxa8 16.Nd2 Qxd4+ 17.Kg2 Rf8
					18.Rd1 Bg5
0:00	1/6	-3.02	66527		15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
					18.Nd2 Qe2+ 19.Kg1
0:00	1/7	-3.09	113078		15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
					18.Nd2 Qe2+ 19.Rf2
0:00	1/8	-3.04	278996		15...Rxa8 16.Rf1 Bh4+ 17.Kg1 Qxd4+
					18.Kh1 Qd3 19.Nd2 Bg5 20.Rf2 Rf8
0:00	1/8	-5.23	618023		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Rxa8 20.dxe5
					Qg2+ 21.Kh5 Qg6+ 22.Kh4 Qxe4+ 23.Kg3
					Qxh1 24.Bf4
0:00	1/9	-Mate15	1651820		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
					Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
					Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
					Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
					Rf8#
0:01	1/10	-Mate15	2796402		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
					Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
					Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
					Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
					Rf8#

So I tried it on SF 12 (only one core, to be fair), just to make sure that it wasn't something that any engine could find, although The King was always a terrific matefinder in its day:

info depth 26 seldepth 42 multipv 1 score mate 15 nodes 8316501 nps 2464148 hashfull 1000 tbhits 0 time 3375 pv e7h4 f2g2 d3e2 g2h3 e2f3 h3h4 f3f2 h4g5 h8a8 a2a4 f2g2 g5h5 g2f3 h5g5 h7h6 g5g6 f3e4 g6g7 e4g2 g7h7 g2g8 h7h6 g8h8 h6g6 a8g8 g6f5 h8h7 f5f6 h7g6

More than 3x longer to find it. Made me happy, anyway....

jm

[Guenther]

...

I was playing around with some possible escapes for White's King (using Chessmater 9000 as I always like to feel the nostalgia) and came up with this position if White played 15.Kf2:
[d]Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15

And The King announced Mate in 15 in less than one second:

Code: Select all

...
0:01	1/10	-Mate15	2796402		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
					Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
					Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
					Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
					Rf8#

So I tried it on SF 12 (only one core, to be fair), just to make sure that it wasn't something that any engine could find, although The King was always a terrific matefinder in its day:

info depth 26 seldepth 42 multipv 1 score mate 15 nodes 8316501 nps 2464148 hashfull 1000 tbhits 0 time 3375 pv e7h4 f2g2 d3e2 g2h3 e2f3 h3h4 f3f2 h4g5 h8a8 a2a4 f2g2 g5h5 g2f3 h5g5 h7h6 g5g6 f3e4 g6g7 e4g2 g7h7 g2g8 h7h6 g8h8 h6g6 a8g8 g6f5 h8h7 f5f6 h7g6

More than 3x longer to find it. Made me happy, anyway.... :)

jm

Where have you been John? Four posts since last September. Don't forget Myrddin :)
It's six years now since the last version!

[JVMerlino]

Where have you been John? Four posts since last September. Don't forget Myrddin
It's six years now since the last version!

Hi Guenther!

Well, computer chess has almost entirely grown out of my ability to meaningfully contribute to any discussion about current topics. So there's really very rarely a need for me to post.

As for Myrddin, I have worked on it a little bit over the six years, trying to make improvements on its obvious weaknesses. Its King Safety code is terribly naive, it does a fair number of things inefficiently, and it doesn't even have tapered eval! But everything I've tried has either produced no improvement or made it noticeably worse! So, as we all discover eventually, it is easy to get discouraged. I'm almost to the point of just putting it all up on github and letting the community point out all of the horrible code that I'm not able to spot.

There may be a new Myrddin someday, but even then I doubt there will be any shocking improvement. Way back when I started working on it, I had some vague goal of just trying to reach 2500 ELO. It's still more than 100 away from that on CCRL. So, yeah, I don't find myself particularly motivated.

[Essay]

Hi Jon,
Chessmaster has always been my favourite program to play against, I love the personalities and the huge number of available parameters one can change. I still fondly remember Chessmaster 6000, my favourite program at that time (Windows 98) on my first PC. Also I loved Chessmaster 9000, which I still think was maybe the best of the whole series. It's sad that the series ended, I appreciate that the King engine can't compete strengthwise with the latest engines today, but Chessmaster's learning and training facilities and chess board/piece options etc made it an excellent software package.

[Ajedrecista]

Hello Jon:

So I was enjoying one of agadmator's excellent chess videos - Rodzynski v Alekhine, 1913.
https://www.youtube.com/watch?v=zJU1whqM8yM

Here's the game:
[pgn]1. e4 e5 2. Nf3 d6 3. Bc4 Nc6 4. c3 Bg4 5. Qb3 Qd7 6. Ng5 Nh6 7. Bxf7 Nxf7 8. Nxf7 Qxf7 9. Qxb7 Kd7 10. Qxa8 Qc4 11. f3 Bxf3 12. gxf3 Nd4 13. d3 Qxd3 14. cxd4 Be7 15. Qxh8 Bh4#[/pgn]

I was playing around with some possible escapes for White's King (using Chessmater 9000 as I always like to feel the nostalgia) and came up with this position if White played 15.Kf2:
[d]Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15

And The King announced Mate in 15 in less than one second:

Code: Select all

Time	Depth	Score	Positions	Moves
0:00	1/3	-2.65	920		15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 Rf8
0:00	1/4	-2.47	3161		15...Qxd4+ 16.Kg2 Rxa8 17.Nc3 c6
					18.Ne2
0:00	1/4	-2.76	6357		15...Rxa8 16.Nd2 exd4 17.Rg1 Qe3+
					18.Kf1
0:00	1/5	-2.90	16626		15...Rxa8 16.Nd2 Qxd4+ 17.Kg2 Rf8
					18.Rd1 Bg5
0:00	1/6	-3.02	66527		15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
					18.Nd2 Qe2+ 19.Kg1
0:00	1/7	-3.09	113078		15...Rxa8 16.Rf1 Rf8 17.Kg2 exd4
					18.Nd2 Qe2+ 19.Rf2
0:00	1/8	-3.04	278996		15...Rxa8 16.Rf1 Bh4+ 17.Kg1 Qxd4+
					18.Kh1 Qd3 19.Nd2 Bg5 20.Rf2 Rf8
0:00	1/8	-5.23	618023		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Rxa8 20.dxe5
					Qg2+ 21.Kh5 Qg6+ 22.Kh4 Qxe4+ 23.Kg3
					Qxh1 24.Bf4
0:00	1/9	-Mate15	1651820		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
					Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
					Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
					Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
					Rf8#
0:01	1/10	-Mate15	2796402		15...Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+
					18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5
					Qh3+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7
					Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7
					Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5
					Rf8#

So I tried it on SF 12 (only one core, to be fair), just to make sure that it wasn't something that any engine could find, although The King was always a terrific matefinder in its day:

info depth 26 seldepth 42 multipv 1 score mate 15 nodes 8316501 nps 2464148 hashfull 1000 tbhits 0 time 3375 pv e7h4 f2g2 d3e2 g2h3 e2f3 h3h4 f3f2 h4g5 h8a8 a2a4 f2g2 g5h5 g2f3 h5g5 h7h6 g5g6 f3e4 g6g7 e4g2 g7h7 g2g8 h7h6 g8h8 h6g6 a8g8 g6f5 h8h7 f5f6 h7g6

More than 3x longer to find it. Made me happy, anyway....

jm

I tried SF 12 with NNUE disabled and is fast reporting mating evals. However, it reports a checkmate in 13 instead of a checkmate in 15:

Code: Select all

FEN: Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15

Stockfish_20090216_x64_modern:
Found 145 tablebases
classical evaluation enabled
  1/1	00:00	         232	10.545	+6,86	Rh8xa8
[...]
 10/17	00:00	      33.659	909.702	+5,79	Rh8xa8 Nb1d2 Be7g5 Rh1f1 Bg5e3+ Kf2e1 e5xd4 Nd2b3 Ra8f8 Bc1xe3 Qd3xe3+ Ke1d1
 11/18	00:00	      57.071	1.214.276	+6,21	Rh8xa8 Nb1d2 Be7g5 Rh1f1 Ra8f8 Kf2g1 Bg5e3+ Kg1h1 Qd3e2
[...]
 29/36+	00:04	  13.202.071	3.292.287	+67,50	Be7h4+
 29/36+	00:04	  13.255.395	3.292.447	+M38	Be7h4+
 29/36-	00:04	  13.256.861	3.292.811	+66,12	Be7h4+ Kf2g2
 29/40+	00:04	  13.286.430	3.290.349	+110,55	Be7h4+
 29/40+	00:04	  13.590.472	3.266.155	+148,62	Be7h4+
 29/40	00:04	  13.803.157	3.259.305	+M26	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4g4 h7h5+ Rh3xh5 Qf2g2+ Kg4h4 Qg2xe4+ Kh4g5 Qe4g2+ Kg5h4 Ra8f8 Rh5h6 Qg2h2+ Kh4g4 g7xh6 Bc1e3 h6h5+ Kg4g5 Qh2g2+ Kg5h4 Rf8f4+ Kh4xh5 Qg2h3+ Kh5g6
 30/49	00:04	  15.075.714	3.257.500	+M18	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Rf8f5+ Rg3g5 Qe4e2+ Kh5h4 Qe2h2+ Kh4g4 h7h5+ Rg5xh5 Qh2xh5+ Kg4g3 Rf5f3+ Kg3g2 Qh5h3+ Kg2g1 Rf3f1+
 31/34	00:05	  15.520.572	3.246.302	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Qe4h1+ Kh5g4 Qh1h2 Bc1h6 g7xh6 d4xe5 h6h5+ Kg4g5 Qh2xg3+ Kg5xh5 Qg3h3+ Kh5g5 Rf8f5+
 32/34	00:05	  16.082.880	3.228.197	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Kh4h5 Qf2e2+ Kh5h4 Qe2xe4+ Kh4h5 Ra8f8 Rh3g3 Qe4h1+ Kh5g4 Qh1h2 Bc1h6 g7xh6 d4xe5 h6h5+ Kg4g5 Qh2xg3+ Kg5xh5 Qg3h3+ Kh5g5 Rf8f5+
 33/34	00:05	  17.943.722	3.225.547	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
 34/34	00:06	  18.824.594	3.221.183	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
 35/34	00:06	  19.614.242	3.215.976	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
 36/34	00:06	  20.689.326	3.208.642	+M17	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 h7h5+ Kg4h4 Qf1h1+ Kh4g5 Qh1xc1+ Nb1d2 Qc1xd2+ Kg5h4 Qd2h2+ Rg3h3 Rf8f4+ Kh4g5 Rf4g4+ Kg5xh5 Qh2xh3+
 37/34	00:07	  22.529.588	3.200.225	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 38/32	00:07	  23.407.176	3.197.701	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 39/32	00:07	  24.541.799	3.187.246	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 40/32	00:08	  25.521.609	3.180.262	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 41/32	00:08	  27.552.729	3.184.182	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 42/32	00:09	  29.902.538	3.178.753	+M16	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Rh8xa8 Rh1g1 Qf3f2+ Rg1g3 Qf2xh2+ Rg3h3 Qh2f2+ Rh3g3 Ra8f8 Kh4h3 Qf2f1+ Kh3g4 Qf1d1+ Kg4g5 Qd1h1 Kg5g4 Rf8f1 Nb1c3 g7g6 Rg3h3 Rf1g1+ Kg4h4 Qh1g2 Bc1g5 Qg2xg5+
 43/32	00:14	  47.115.238	3.235.047	+M13	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Qf3f2+ Kh4h5 Rh8xa8 Rh1g1 Qf2xg1 Nb1c3 Qg1xh2+ Kh5g4 Ra8f8 Nc3e2 h7h5+ Kg4g5 Qh2g2+ Ne2g3 Qg2xg3+ Kg5xh5 Rf8h8+ Bc1h6 Rh8xh6+
[...]
 73/26	02:19	 448.957.950	3.234.357	+M13	Be7h4+ Kf2g2 Qd3e2+ Kg2h3 Qe2xf3+ Kh3xh4 Qf3f2+ Kh4h5 Rh8xa8 Rh1g1 Qf2xg1 Nb1c3 Qg1xh2+ Kh5g4 Ra8f8 Nc3e2 h7h5+ Kg4g5 Qh2g2+ Ne2g3 Qg2xg3+ Kg5xh5 Rf8h8+ Bc1h6 Rh8xh6+

I stopped the search at depth 73 with 228 TB hits on the full set of 3, 4 and 5-man Syzygy EGTB.

My run deviates with 19.- Kh5 instead of 19.- Kg5 given by both The King and your SF run. I cleared hash and start a new analysis with this position:

[d]Q6r/p1pk2pp/3p4/4p3/3PP2K/8/PP3q1P/RNB4R w - - 1 19

SF 12 without NNUE insists on the same mainline of the checkmate in 13 (now a checkmate in 9 after the first moves are played). Then the question is: what is better, 19.- Kh5 or 19.- Kg5? Well, I let Chest 5.2 in normal mode to do the work after white plays each of the four legal moves: Kg4, Kg5, Kh3 and Kh5:

Code: Select all

19.- Kg4 ==> #3 (#7 in the original position).
19.- Kg5 ==> #9 (#13 in the original position).
19.- Kh3 ==> #8 (#12 in the original position).
19.- Kh5 ==> #9 (#13 in the original position).

Code: Select all

FEN: Q6r/p1pk2pp/3p4/4p3/3PP1K1/8/PP3q1P/RNB4R b - - 1 19

ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p3/3PP1K1/8/PP3q1P/RNB4R b - -   (11+9)
Stellungs-Analyse:  C0/R0/K4/P9/X34   S:9/38
Problem im Clipboard gefunden:  #3; 00:00;
Suche nach Matt in 11 ...  (Hash=512MB)
   3	00:00	           0	0	+M3	h7h5+
Suche abgeschlossen ...  (Zeit=0.00s)
Matt in 3 gefunden !  (1 Lösung in 00:00)
  3/3	00:00	         359	179.500	+M3	h7h5+ Kg4h3 Qf2f3+ Kh3h4 Qf3g4+

Code: Select all

FEN: Q6r/p1pk2pp/3p4/4p1K1/3PP3/8/PP3q1P/RNB4R b - - 1 19 

ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p1K1/3PP3/8/PP3q1P/RNB4R b - -   (11+9)
Stellungs-Analyse:  C0/R0/K3/P9/X31   S:9/37
Suche nach Matt in 11 ...  (Hash=512MB)
   9	04:27	 164.886.710	719.341	+M9	Qf2g2+
   9	10:25	 407.913.558	670.650	+M9	Rh8xa8
Suche abgeschlossen ...  (Zeit=864.78s)
Matt in 9 gefunden !  (2 Lösungen in 14:24)
  9/9	14:26	 562.526.809	650.483	+M9	Rh8xa8 Nb1c3 Qf2g2+ Kg5h5 Qg2h3+ Kh5g5 g7g6 Nc3d5 Qh3h5+ Kg5f6 g6g5 Nd5e7 Qh5h6+ Kf6f5 Ra8f8+ Kf5g4 Qh6h4+
  9/9	14:26	 562.526.809	650.483	+M9	Qf2g2+ Kg5h5 Rh8xa8 d4xe5 Qg2h3+ Kh5g5 Ra8f8 Rh1f1 Rf8xf1 Bc1e3 Qh3xe3+ Kg5h5 Qe3h3+ Kh5g5 Rf1g1+ Kg5f4 g7g5+

Code: Select all

FEN: Q6r/p1pk2pp/3p4/4p3/3PP3/7K/PP3q1P/RNB4R b - - 1 19 

ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p3/3PP3/7K/PP3q1P/RNB4R b - -   (11+9)
Stellungs-Analyse:  C0/R0/K2/P8/X30   S:9/38
Suche nach Matt in 11 ...  (Hash=512MB)
   8	00:13	   8.900.406	789.813	+M8	h7h5
Suche abgeschlossen ...  (Zeit=40.10s)
Matt in 8 gefunden !  (1 Lösung in 00:40)
  8/8	00:40	  32.318.056	805.996	+M8	h7h5 Qa8d8+ Rh8xd8 Bc1f4 g7g5 Bf4g3 g5g4+ Kh3h4 Qf2f6+ Kh4xh5 Rd8g8 Bg3f4 e5xf4 h2h3 Qf6g5+

Code: Select all

FEN: Q6r/p1pk2pp/3p4/4p2K/3PP3/8/PP3q1P/RNB4R b - - 1 19 

ChestUCI:
FEN: Q6r/p1pk2pp/3p4/4p2K/3PP3/8/PP3q1P/RNB4R b - -   (11+9)
Stellungs-Analyse:  C0/R0/K3/P9/X33   S:9/37
Suche nach Matt in 11 ...  (Hash=512MB)
   9	01:26	  44.696.527	789.775	+M9	g7g6+
   9	09:29	 354.978.277	719.720	+M9	Rh8xa8
Suche abgeschlossen ...  (Zeit=735.87s)
Matt in 9 gefunden !  (2 Lösungen in 12:15)
  9/9	12:17	 519.688.521	706.228	+M9	Rh8xa8 a2a4 g7g6+ Kh5g5 h7h6+ Kg5g4 Qf2g2+ Kg4h4 g6g5+ Kh4h5 Qg2h3+ Kh5g6 Ra8g8+ Kg6h7 Qh3e6 h2h3 Qe6g6+
  9/9	12:17	 519.688.521	706.228	+M9	g7g6+ Kh5g5 h7h6+ Kg5g4 Qf2g2+ Kg4h4 h6h5 Qa8d8+ Kd7xd8 h2h3 Qg2f2+ Kh4g5 Kd8e7 Bc1f4 Qf2xf4+ Kg5xg6 Qf4f6+

Chest found some checkmates in 9 from the point that my SF run deviated from your original post. I would say that the position from your post is likely a checkmate in 13.

------------

Other than that, it is always a pleasure to see the old rockers shining from time to time. I had Chessmaster 9000 and enjoyed it a lot!

Regards from Spain.

Ajedrecista.

[JVMerlino]

Chest found some checkmates in 9 from the point that my SF run deviated from your original post. I would say that the position from your post is likely a checkmate in 13.

Yes, I think you are correct. I let The King run for nearly 10 minutes, and it eventually got to Mate in 13, but wasn't able to improve on it.

[Vinvin]

Cfish 040121 with 1 thread on my old i7@4 GHz (divide the time by around 2 to compare to a modern AMD) :
4 seconds to find a mate in 15
7 seconds to fins a mate in 13

Code: Select all

FEN: Q6r/p1pkb1pp/3p4/4p3/3PP3/3q1P2/PP3K1P/RNB4R b - - 0 15

CF_EXT_x64_040121_ELTO_AVX_sparse:
Hybrid NNUE evaluation using nn-62ef826d1a6d.nnue enabled.
...
 20/35	00:00	 1 047 189	1 659 570	-8,65	15. ... Rxa8 16.Rg1 Bh4+ 17.Kg2 Qe2+ 18.Kh3 Be7 19.Bg5 Qxf3+ 20.Rg3 Qf1+ 21.Rg2 Bxg5 22.Nd2 Qd3+ 23.Rg3 Qxd2 24.dxe5 Bf4 25.exd6 Qxb2 26.Rh1 Bxd6 27.Rd1 Kc6 28.Rg2 Qc3+ 29.Kg4 h5+ 30.Kh4
 21/42	00:01	 2 885 035	1 721 381	-8,27	15. ... Rxa8 16.Rg1 Rf8 17.Nd2 Bh4+ 18.Kg2 Qe2+ 19.Kh1 Bf2 20.dxe5 Bxg1 21.Kxg1 Qe3+ 22.Kg2 Kc8 23.b3 Qe2+ 24.Kg1 Qe1+ 25.Kg2 dxe5 26.Bb2 Qxd2+ 27.Kh1 Qxb2 28.Rf1
 22/35	00:01	 3 450 011	1 732 803	-8,63	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Rxa8 18.Rg1 Be7 19.Be3 Qxf3+ 20.Rg3 Qf1+ 21.Rg2 exd4 22.Nd2 Qxa1 23.Bxd4 Qe1 24.Rf2 g5 25.Kg2 Rf8 26.Nb3 Rxf2+ 27.Bxf2 Qxe4+ 28.Kg3 Qe5+ 29.Kf3 Qxb2 30.Bg3 Qxa2 31.Nd4 Qd5+ 32.Ke3
 23/40	00:02	 4 173 023	1 774 244	-9,04	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Rxa8 18.Rg1 Be7 19.Be3 Qxf3+ 20.Rg3 Qf1+ 21.Rg2 exd4 22.Nd2 Qxa1 23.Bg5 Bf8 24.Bh4 Qxa2 25.b3 Qa5 26.Rf2 Kc6 27.Bg3 d3 28.Kg2
 24/36	00:02	 4 919 269	1 785 578	-10,96	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.Nc3 Rf8 23.a3 Qxh1 24.Ne2 Qxh2+ 25.Kg5 Rf6 26.Kg4 h5+ 27.Kg5 Qg2+ 28.Kxh5
 25/35-	00:03	 5 412 813	1 788 177	-11,12	15. ... Bh4+
 25/35-	00:03	 5 536 092	1 788 143	-11,25	15. ... Bh4+
 25/38-	00:03	 6 068 993	1 797 155	-13,00	15. ... Bh4+
 25/38	00:03	 6 085 123	1 797 142	-12,78	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.a4 Qxh1 23.dxe5 Qxh2+ 24.Kg5 Rf8 25.e6+ Kxe6 26.Ra3 Rf1 27.Rh3 Qxh3 28.Bf4 Rg1+ 29.Bg3 Qxg3+ 30.Kh5 Rxb1
 26/36-	00:03	 6 280 768	1 800 162	-12,87	15. ... Bh4+
 26/36-	00:03	 6 485 691	1 802 081	-12,95	15. ... Bh4+
 26/36-	00:03	 7 203 991	1 818 730	-15,54	15. ... Bh4+
 26/36	00:03	 7 232 779	1 819 567	-14,03	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.Na3 Rf8 23.dxe5 Qxh1 24.e6+ Kxe6 25.Bh6 Qxh2+ 26.Kg4 Qg2+ 27.Kh4 Qxe4+ 28.Kh5 Rf3
 27/38-	00:04	 7 300 215	1 820 502	-14,12	15. ... Bh4+
 27/38-	00:04	 7 421 999	1 821 796	-14,20	15. ... Bh4+
 27/38-	00:04	 7 684 646	1 831 421	-24,54	15. ... Bh4+
 27/38	00:04	 7 685 096	1 831 529	-15,13	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.Na3 Rf8 23.Nb5 Qh3+ 24.Kg5 h6+ 25.Kg6 Qe6+ 26.Kh7 Qg8+ 27.Kg6 Qf7+ 28.Kh7
 28/36-	00:04	 7 738 495	1 833 332	-15,21	15. ... Bh4+
 28/36-	00:04	 7 827 746	1 832 766	-15,29	15. ... Bh4+
 28/36-	00:04	 7 982 088	1 836 229	-65,97	15. ... Bh4+
 28/36	00:04	 7 982 392	1 836 299	-15,99	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.a4 Qxh1 23.Ra2 Qf3+ 24.Kg5 Rf8
 29/26-	00:04	 8 032 141	1 837 598	-16,07	15. ... Bh4+
 29/26-	00:04	 8 150 983	1 836 634	-16,15	15. ... Bh4+
 29/27-	00:04	 8 300 678	1 840 505	-M27	15. ... Bh4+
 29/27	00:04	 8 301 942	1 839 969	-72,08	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 Qg2+ 21.Kh5 Rxa8 22.a4 Qxh1 23.Ra3 Qxh2+ 24.Kg5 Rf8 25.dxe5 Rf1 26.e6+ Kxe6
 30/32-	00:04	 8 350 720	1 840 176	-72,86	15. ... Bh4+
 30/32-	00:04	 8 357 992	1 840 967	-73,09	15. ... Bh4+
 30/32-	00:04	 8 408 310	1 842 715	-M27	15. ... Bh4+
 30/32	00:04	 8 432 710	1 842 812	-M15	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5 Qe2+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7 Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7 Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5 Rf8+
 31/30	00:04	 8 681 901	1 841 726	-M15	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5 Qe2+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7 Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7 Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5 Rf8+
 32/30	00:05	 9 322 429	1 848 221	-M15	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kg5 Qg2+ 20.Kh5 Qe2+ 21.Kg5 h6+ 22.Kg6 Qg4+ 23.Kf7 Qe6+ 24.Kxg7 Rxa8 25.Rg1 Rg8+ 26.Kh7 Qf7+ 27.Kxh6 Rh8+ 28.Kg5 Qg7+ 29.Kf5 Rf8+
 33/30	00:05	 10 698 304	1 847 082	-M14	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kg5 Rxa8 20.dxe5 Rf8 21.Kh5 Qf3+ 22.Kh4 Qxh1 23.Nc3 Qxh2+ 24.Kg5 Rf3 25.e6+ Kxe6 26.Ne2 Qg2+ 27.Ng3 Rxg3+ 28.Kf4 Rf3+
 34/40	00:06	 12 236 733	1 839 833	-M14	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 h6+ 21.Kg6 Qg4+ 22.Kf7 Qe6+ 23.Kxg7 Rxa8 24.Rg1 Rg8+ 25.Kh7 Qf7+ 26.Kxh6 Rh8+ 27.Kg5 Qg7+ 28.Kf5 Rf8+
 35/28	00:06	 12 397 500	1 839 664	-M14	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 h6+ 21.Kg6 Qg4+ 22.Kf7 Qe6+ 23.Kxg7 Rxa8 24.Rg1 Rg8+ 25.Kh7 Qf7+ 26.Kxh6 Rh8+ 27.Kg5 Qg7+ 28.Kf5 Rf8+
 36/28	00:06	 12 603 535	1 840 200	-M14	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 h6+ 21.Kg6 Qg4+ 22.Kf7 Qe6+ 23.Kxg7 Rxa8 24.Rg1 Rg8+ 25.Kh7 Qf7+ 26.Kxh6 Rh8+ 27.Kg5 Qg7+ 28.Kf5 Rf8+
 37/28	00:07	 13 073 926	1 841 916	-M14	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Qe2+ 20.Kg5 h6+ 21.Kg6 Qg4+ 22.Kf7 Qe6+ 23.Kxg7 Rxa8 24.Rg1 Rg8+ 25.Kh7 Qf7+ 26.Kxh6 Rh8+ 27.Kg5 Qg7+ 28.Kf5 Rf8+
 38/28	00:07	 14 744 350	1 852 305	-M13	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Rxa8 20.Rg1 Qxg1 21.Bf4 Qg6+ 22.Kh4 Rf8 23.Bg3 Qxe4+ 24.Kh3 Qf5+ 25.Kh4 g5+ 26.Kh5 Qh3+ 27.Kxg5 Rf5+
 39/26	00:08	 15 255 795	1 858 423	-M13	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Rxa8 20.Rg1 Qxg1 21.Bf4 Qg6+ 22.Kh4 Rf8 23.Bg3 Qxe4+ 24.Kh3 Qf5+ 25.Kh4 g5+ 26.Kh5 Qh3+ 27.Kxg5 Rf5+
 40/26	00:08	 15 869 764	1 863 085	-M13	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Rxa8 20.Rg1 Qxg1 21.Bf4 Qg6+ 22.Kh4 Rf8 23.Bg3 Qxe4+ 24.Kh3 Qf5+ 25.Kh4 g5+ 26.Kh5 Qh3+ 27.Kxg5 Rf5+
 41/26	00:08	 16 460 525	1 867 331	-M13	15. ... Bh4+ 16.Kg2 Qe2+ 17.Kh3 Qxf3+ 18.Kxh4 Qf2+ 19.Kh5 Rxa8 20.Rg1 Qxg1 21.Bf4 Qg6+ 22.Kh4 Rf8 23.Bg3 Qxe4+ 24.Kh3 Qf5+ 25.Kh4 g5+ 26.Kh5 Qh3+ 27.Kxg5 Rf5+