another hard position (mate in 18) from 1998, by Ed Shröder

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MikeB
Posts: 3941
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: another hard position (mate in 18) from 1998, by Ed Shröder

Post by MikeB » Sat Jan 04, 2020 7:32 am

cur-dev-blackdiamond on a threadripper

Code: Select all

info depth 18 seldepth 28 multipv 1 score mate 15 nodes 494286728 nps 104126127 hashfull 266 tbhits 0 time 4747 pv d3g6 h7g6 f1d3 g6h5 g3g4 h5g4 h1g1 g4h3 d3f1 h3h2 f2g3 h2g1 a5a1 b8a8 a1b1 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 g8a8 a3b3 a8a3 b3a3 f6g5 f1h3 g5c1 b1c1

Branko Radovanovic
Posts: 65
Joined: Sat Sep 13, 2014 2:12 pm

Re: another hard position (mate in 18) from 1998, by Ed Shröder

Post by Branko Radovanovic » Sat Jan 04, 2020 12:17 pm

Houdini 1.5a gets it too:

Code: Select all

 4/14	00:00	 2k	0	-1,68	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Nb4xc6 Qd7xc6 Ra5xb5
 5/14	00:00	 2k	0	-1,68	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Nb4xc6 Qd7xc6 Ra5xb5
 6/18	00:00	 4k	3.632k	-1,64	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Nb4xc6 Qd7xc6 Ra5-a7 Rb8-a8
 7/18	00:00	 6k	820k	-1,76	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Nb4-a6 Rb8-a8 Na6-c5
 8/18	00:00	 10k	872k	-1,79	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Nb4-a6 Rb8-a8 Na6-c5 Qd7-c7
 9/19+	00:00	 13k	897k	-1,67	h4-h5
 9/19	00:00	 15k	788k	-1,69	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Qd3-e3 Rg8-c8 Bf1-d3 Bc6-a8 Ra5-a3
 10/22+	00:00	 31k	1.229k	-1,57	h4-h5
 10/22+	00:00	 33k	1.213k	-1,37	h4-h5
 10/25	00:00	 109k	2.226k	-1,42	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-h3 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Bc6-d7
 11/26	00:00	 144k	2.358k	-1,42	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-h3 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Bc6-d7
 12/26	00:00	 188k	2.654k	-1,42	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-h3 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Bc6-d7
 13/34-	00:00	 353k	3.599k	-1,52	h4-h5 Kh7-h8
 13/34-	00:00	 850k	5.150k	-1,76	h4-h5 Kh7-h8
 13/42	00:00	 1.375k	5.269k	-1,63	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-g2 Bc6-d7 Kb2-c2 Qa7-a4+ Kc2-b2 Qa4-a3+ Kb2-c2 Ra8-c8 Rh1-b1 Qa3-a5 Kc2-b2 Rc8-a8 Qf3-f7 Qa5-a3+ Kb2-c2 Ra8-c8 Qf7-f3 Qa3-a5
 14/42	00:00	 1.460k	5.288k	-1,63	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-g2 Bc6-d7 Kb2-c2 Qa7-a4+ Kc2-b2 Qa4-a3+ Kb2-c2 Ra8-c8 Rh1-b1 Qa3-a5 Kc2-b2 Rc8-a8 Qf3-f7 Qa5-a3+ Kb2-c2 Ra8-c8 Qf7-f3 Qa3-a5
 15/42	00:00	 2.704k	6.009k	-1,63	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-g2 Bc6-d7 Kb2-c2 Qa7-a4+ Kc2-b2 Qa4-a3+ Kb2-c2 Ra8-c8 Rh1-b1 Qa3-a5 Kc2-b2 Rc8-a8 Qf3-f7 Qa5-a3+ Kb2-c2 Ra8-c8 Qf7-f3 Qa3-a5
 16/42-	00:00	 7.172k	7.486k	-1,75	h4-h5 Kh7-h8
 16/42	00:01	 13.616k	8.056k	-1,60	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3-e3 Rg8-c8 Ra5-a1 Nd6-c4+ Bf1xc4 b5xc4 Qe3xf3 Rc8-f8 Qf3-e2 Bf6-e7 Bf2-e1 Be7xb4 c3xb4 Qd7-e8 Ra1-a6 e6-e5 Qe2xe5 Qe8xg6 Be1-d2 Kh8-g8 Ra6-a7
 17/42-	00:01	 14.287k	8.053k	-1,72	h4-h5 Kh7-h8
 17/42	00:02	 24.147k	8.448k	-1,67	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3-e3 Rg8-c8 Bf2-e1 Nd6-c4+ Bf1xc4 b5xc4 Qe3xf3 Rc8-f8 Qf3-e3 Kh8-g8 Rh1-h2 Bf6-d8 Ra5-a1 Bd8-g5 Qe3-e5 Bg5-f6 Qe5-f4 Bf6-e7 Qf4-e5 Be7xb4 c3xb4
 18/42	00:03	 25.849k	8.433k	-1,67	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3-e3 Rg8-c8 Bf2-e1 Nd6-c4+ Bf1xc4 b5xc4 Qe3xf3 Rc8-f8 Qf3-e3 Kh8-g8 Rh1-h2 Bf6-d8 Ra5-a1 Bd8-g5 Qe3-e5 Bg5-f6 Qe5-f4 Bf6-e7 Qf4-e5 Be7xb4 c3xb4
 18/49+	00:04	 43.208k	9.088k	-1,55	Qd3xg6+
 18/55+	00:05	 51.103k	9.020k	-0,93	Qd3xg6+
 18/63	00:07	 69.217k	9.091k	-0,25	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Bf6xd4 Bf2-g3+ Kh2-h1 Rg4xd4 Qd7-d6 Bg3xd6 Nf7xd6 Nb4xc6 Kh1-g1 Ra5-a1 Rb8-a8 Ra1-e1 Kg1-f2 Re1xe6 g7-g5 Re6xd6 Kf2xf1 h4xg5 h6xg5 Rd4-g4 f3-f2 Rd6xd5 Ra8-e8 Nc6-d4 Kf1-e1 Rd5-f5 Rg8-f8 Rg4xg5 Rf8xf5 Rg5xf5 f2-f1Q Rf5xf1+ Ke1xf1 Nd4xb5
 19/63+	00:09	 87.146k	9.238k	-0,18	Qd3xg6+
 19/63+	00:09	 90.660k	9.220k	-0,05	Qd3xg6+
 19/71+	00:46	 461.964k	9.853k	+16,22	Qd3xg6+
 19/74	00:53	 532.893k	9.915k	+38,95	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Bf6xd4 c3xd4 e6-e5 Bf2-g3+ Kh2-h1 Ra5-a1 Rb8-a8 Ra1-d1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 f3-f2 Nb4xc6 Kh1-g1 Ra7xf7 g7-g5 d4xe5 d5-d4 h4xg5 h6-h5 Bg3xf2+ Kg1xf1 Rg4-g1+ Kf1-e2 Nc6xd4+
 20/74	01:01	 662.715k	10.848k	+M19	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Nf7-d6 Bf2-g3+ Kh2-h1 Ra5-a1 Rb8-a8 Ra1-e1 Ra8-a1 Re1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Bf6xd4 c3xd4 Qa7-a4 Bf1-g2+ Kh1xg2 Bg3-f4+ Kg2-h3 Rg4-g3+ Kh3-h2 Rg3-g5+ Kh2-h3 Rd1-h1+
 21/74	01:04	 720.633k	11.143k	+M19	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Nf7-d6 Bf2-g3+ Kh2-h1 Ra5-a1 Rb8-a8 Ra1-e1 Ra8-a1 Re1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Bf6xd4 c3xd4 Qa7-a4 Bf1-g2+ Kh1xg2 Bg3-f4+ Kg2-h3 Rg4-g3+ Kh3-h2 Rg3-g5+ Kh2-h3 Rd1-h1+
 22/74	01:13	 870.061k	11.908k	+M18	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Nf7-d6 Bf2-g3+ Kh2-h1 Ra5-a1 Rb8-a8 Ra1-e1 Ra8-a1 Re1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b1 Qa7-a4 Bf1-g2+ Kh1xg2 Bg3-f4+ Kg2-h3 Rg4-g3+ Kh3-h2 Rg3-g5+ Kh2-h3 Rd1-h1+
 23/74	01:27	 1.124.670k	12.813k	+M18	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g4 Nf7-d6 Bf2-g3+ Kh2-h1 Ra5-a1 Rb8-a8 Ra1-e1 Ra8-a1 Re1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b1 Qa7-a4 Bf1-g2+ Kh1xg2 Bg3-f4+ Kg2-h3 Rg4-g3+ Kh3-h2 Rg3-g5+ Kh2-h3 Rd1-h1+
 24/74	02:05	 1.829.798k	14.529k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Nb4-a2 Qa7xa2+ Ka1xa2 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 25/74	02:52	 2.692.058k	15.631k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Nb4-a2 Qa7xa2+ Ka1xa2 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 25/74	03:02	 2.865.581k	15.741k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Nb4-a2 Qa7xa2+ Ka1xa2 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+

Branko Radovanovic
Posts: 65
Joined: Sat Sep 13, 2014 2:12 pm

Re: another hard position (mate in 18) from 1998, by Ed Shröder

Post by Branko Radovanovic » Sat Jan 04, 2020 12:31 pm

...and so does Spike 1.4, even if some of the intermediate mate evals are spurious:

Code: Select all

 0	00:00	 0	0	-5,89	
 1	00:00	 128	64k	-4,54	Qd3xf3
 1	00:00	 179	60k	-4,54	Qd3xf3
 2	00:00	 316	105k	-4,57	Qd3xf3 Bf6-d8
 2	00:00	 522	174k	-2,02	h4-h5 Nf7-g5 Nb4xc6 Qd7xc6 h5xg6+
 2	00:00	 733	183k	-2,02	h4-h5 Nf7-g5 Nb4xc6 Qd7xc6 h5xg6+
 3	00:00	 984	246k	-2,02	h4-h5 Nf7-g5 Nb4xc6 Qd7xc6 h5xg6+
 3	00:00	 1k	283k	-2,02	h4-h5 Nf7-g5 Nb4xc6 Qd7xc6 h5xg6+
 4	00:00	 4k	217k	-1,83	h4-h5 Nf7-g5 Kb2-c1 Kh7-h8 Qd3xg6
 4	00:00	 4k	220k	-1,83	h4-h5 Nf7-g5 Kb2-c1 Kh7-h8 Qd3xg6
 5	00:00	 6k	317k	-1,85	h4-h5 Kh7-h8 Nb4xc6 Qd7xc6 h5xg6
 5	00:00	 6k	325k	-1,85	h4-h5 Kh7-h8 Nb4xc6 Qd7xc6 h5xg6
 6	00:00	 7k	367k	-2,50	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4
 6	00:00	 8k	411k	-2,50	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4
 7+	00:00	 10k	461k	-2,42	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 7	00:00	 11k	509k	-2,50	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 7	00:00	 12k	525k	-2,50	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 8+	00:00	 12k	542k	-2,42	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 8+	00:00	 13k	573k	-2,26	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 8+	00:00	 14k	615k	-1,94	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Nd6-c4+ Bf1xc4 b5xc4 Rh1xh6+
 8	00:00	 24k	900k	-2,01	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Qd3xf3 Bf6-g5 Nb4xc6 Rb8-f8 Ra5-a7 Qd7xc6
 8+	00:00	 32k	1.038k	-1,30	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6
 8+	00:00	 37k	705k	+17,89	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6
 8	00:00	 38k	721k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 8	00:00	 38k	712k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 9	00:00	 41k	744k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 9	00:00	 41k	749k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 10	00:00	 47k	818k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 10	00:00	 48k	824k	+M7	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 11	00:00	 60k	879k	+M8	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 11	00:00	 66k	954k	+M9	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 11-	00:00	 69k	991k	+1,26	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-f4 Bd3-g6 Nf7-e5 d4xe5 Kf4xe5 Bf2-g3+
 11	00:00	 751k	2.722k	-8,90	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Rg1-g3 e6-e5 Rg3xf3 e5xd4 c3xd4 Bf6xh4 Nb4xc6 Rb8-c8 Ra5-a7 Qd7-g4 Rf3-h3+ Qg4xh3 Bf1xh3 Kh2xh3 Bf2xh4 Kh3xh4 Ra7xf7 Rc8xc6
 11	00:00	 1.173k	3.062k	-2,33	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Ra5-a6 Rg8-c8 Kb2-c1 Bc6-b7 Ra6-a3 Bf6-e7 Qd3-b1
 11	00:00	 1.244k	3.087k	-2,33	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Ra5-a6 Rg8-c8 Kb2-c1 Bc6-b7 Ra6-a3 Bf6-e7 Qd3-b1
 12	00:00	 2.024k	3.290k	-1,95	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Kb2-c2 f3-f2 Be3xf2 Ng5-e4 Bf2-e3 Ra8-a1
 12	00:00	 2.195k	3.387k	-1,95	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Kb2-c2 f3-f2 Be3xf2 Ng5-e4 Bf2-e3 Ra8-a1
 13-	00:00	 2.295k	3.380k	-2,03	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Kb2-c2 f3-f2 Be3xf2 Ng5-e4 Bf2-e3 Ra8-a1
 13-	00:00	 2.428k	3.395k	-2,19	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Kb2-c2 f3-f2 Be3xf2 Ng5-e4 Bf2-e3 Ra8-a1
 13-	00:00	 2.972k	3.505k	-2,51	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Kb2-c2 f3-f2 Be3xf2 Ng5-e4 Bf2-e3 Ra8-a1
 13	00:00	 3.335k	3.559k	-2,10	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Ra8-c8 Qf3-f7
 13	00:00	 3.335k	3.555k	-2,10	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Ra8-c8 Qf3-f7
 14-	00:00	 3.497k	3.579k	-2,26	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Ra8-c8 Qf3-f7
 14-	00:01	 4.148k	3.723k	-2,58	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Qa3-a4+ Kc2-d3 Ra8-c8 Qf3-f7
 14	00:01	 5.069k	3.792k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 14	00:01	 5.069k	3.792k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 15-	00:01	 5.498k	3.826k	-2,45	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 15	00:02	 8.659k	4.159k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 15	00:02	 8.659k	4.159k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 16-	00:02	 9.291k	4.176k	-2,37	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 16	00:02	 9.971k	4.223k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 16	00:02	 9.971k	4.223k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 17-	00:02	 10.175k	4.208k	-2,37	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Qa4-a7 Kd3-c2
 17	00:02	 12.680k	4.417k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 17	00:02	 12.680k	4.417k	-2,29	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 18-	00:03	 14.137k	4.407k	-2,37	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-h5
 18	00:04	 20.249k	4.669k	-2,34	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-g4 Qa4-b3 Bg4xe6
 18	00:04	 20.249k	4.669k	-2,34	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-g4 Qa4-b3 Bg4xe6
 19-	00:05	 25.811k	4.616k	-2,42	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-g4 Qa4-b3 Bg4xe6
 19-	00:07	 35.610k	4.777k	-2,58	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-g4 Qa4-b3 Bg4xe6
 19-	00:24	 110.289k	4.517k	-2,90	h4-h5 Kh7-h8 h5xg6 Nf7-g5 Bf2-e3 Rb8-a8 Ra5xa8 Rg8xa8 Be3xg5 Bf6xg5 Qd3xf3 Qd7-a7 Bf1-e2 Qa7-a3+ Kb2-c2 Bc6-d7 Rh1-f1 Qa3-a4+ Kc2-d3 Ra8-g8 Qf3-f7 Bd7-c8 Be2-g4 Qa4-b3 Bg4xe6
 19	00:38	 170.926k	4.471k	-2,73	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Ra5-a6 Nd6-c4+ Kb2-c2 Bc6-b7 Ra6-a7 Qd7-d8 Qd3xf3 Rg8-f8 Qf3-d3 Bf6-g5 Rh1-h2 Kh8-g8 Ra7-a2 Nc4-d2 Kc2-d1 Nd2-e4 Bf2-e1 Qd8-f6 Bf1-h3 Qf6xg6 Qd3xb5
 19	00:38	 170.926k	4.471k	-2,73	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Ra5-a6 Nd6-c4+ Kb2-c2 Bc6-b7 Ra6-a7 Qd7-d8 Qd3xf3 Rg8-f8 Qf3-d3 Bf6-g5 Rh1-h2 Kh8-g8 Ra7-a2 Nc4-d2 Kc2-d1 Nd2-e4 Bf2-e1 Qd8-f6 Bf1-h3 Qf6xg6 Qd3xb5
 20	00:42	 187.887k	4.449k	-2,76	h4-h5 Kh7-h8 h5xg6 Nf7-d6 Ra5-a6 Nd6-c4+ Kb2-c2 Bc6-b7 Ra6-a7 Qd7-d8 Qd3xf3 Rg8-f8 Qf3-d3 Bf6-g5 Rh1-h2 Nc4-d2 Bf1-e2 Nd2-e4 Qd3xb5 Bb7-a8 Qb5-a6 Qd8-f6 Bf2-e1 Qf6xg6
 20+	00:42	 188.808k	4.452k	-2,57	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2
 20+	00:42	 190.222k	4.453k	+17,58	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2
 20	00:42	 190.924k	4.457k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 20	00:42	 191.141k	4.456k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 21	00:43	 192.416k	4.465k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 21	00:43	 192.695k	4.466k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 22	00:43	 195.277k	4.484k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a2+ Kb2xa2 Bf6-g5 Bf1-h3+ Bg5-c1 Rb1xc1+
 22	00:43	 195.705k	4.486k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a2+ Kb2xa2 Bf6-g5 Bf1-h3+ Bg5-c1 Rb1xc1+
 23	00:44	 199.067k	4.508k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 23	00:44	 199.479k	4.511k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 f3-f2 Bf1-h3+ f2-f1Q Rb1xf1+
 24	00:45	 205.460k	4.533k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 24	00:45	 206.113k	4.537k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 25	00:47	 216.695k	4.604k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 25	00:47	 217.123k	4.605k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 26	00:49	 229.564k	4.678k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 26	00:49	 230.473k	4.683k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 27	00:52	 250.957k	4.783k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 27	00:52	 252.409k	4.789k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 28	00:57	 286.264k	4.942k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
 28	00:58	 288.256k	4.951k	+M15	Qd3xg6+ Kh7xg6 Bf1-d3+ Kg6-h5 g3-g4+ Kh5xg4 Rh1-g1+ Kg4-h3 Bd3-f1+ Kh3-h2 Bf2-g3+ Kh2xg1 Ra5-a1 Rb8-a8 Ra1-b1 Ra8-a1 Kb2xa1 Rg8-a8+ Ka1-b2 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b2 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+

Hai
Posts: 548
Joined: Sun Aug 04, 2013 11:19 am

Re: another hard position (mate in 18) from 1998, by Ed Shröder

Post by Hai » Sat Jan 04, 2020 2:51 pm

LC0 v0.23.2 Sergio 30x384 can find a mate too:
And Qxg6 was found from the beginning:

1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Bg5 9.Rd1 Ra1 10.Kxa1 Ra8+ 11.Kb1 Ra1+ 12.Kxa1 Qa7+ 13.Kb2 Qa4 14.Rb1 Bc1+ 15.Rxc1 f2 16.Bh3+ f1Q 17.Rxf1#
+- (2.23) depth: 21/46 00:12:02 16026kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Bg5 9.Rd1 Ra1 10.Kxa1 Ra8+ 11.Kb1 Ra1+ 12.Kxa1 Qa7+ 13.Kb2 Qa4 14.Nc2 Bc1+ 15.Rxc1 b4 16.Bh3#
+- (2.22) depth: 21/46 00:12:52 18167kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Bg5 9.Rd1 Ra1 10.Kxa1 Ra8+ 11.Na2 Rxa2+ 12.Kxa2 Qa7+ 13.Kb2 Qa4 14.Rb1 Qa3+ 15.Kxa3 Be7+ 16.Kb3 Bd6 17.Bh3#
+- (2.20) depth: 22/46 00:13:57 20851kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Bg5 9.hxg5 Ra1 10.Kxa1 Qa7+ 11.Kb2 Qa3+ 12.Kxa3 Ra8+ 13.Kb3 Be8 14.Bh3#
+- (2.17) depth: 22/46 00:19:08 36938kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Ra1 9.Kxa1 Ra8+ 10.Na2 Rxa2+ 11.Kxa2 Qa7+ 12.Kb2 Qa3+ 13.Kxa3 Be7+ 14.Kb3 Ba3 15.Rd1 Bd6 16.Bh3#
+- (2.13) depth: 22/48 00:27:11 59981kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Ra1 9.Kxa1 Qa7+ 10.Kb2 Qa3+ 11.Kxa3 Ra8+ 12.Kb3 Bg5 13.hxg5 Nxg5 14.Bh3#
+- (2.13) depth: 22/48 00:34:46 83108kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rc1 Ra1 9.Kxa1 Qa7+ 10.Kb2 Qa3+ 11.Kxa3 Ra8+ 12.Kb3 Bg5 13.hxg5 Nxg5 14.Bh3#
+- (128.00) depth: 22/48 00:35:46 86207kN


1.Qxg6+ Kxg6 2.Bd3+ Kh5 3.g4+ Kxg4 4.Rg1+ Kh3 5.Bf1+ Kh2 6.Bg3+ Kxg1 7.Ra1 Ra8 8.Rd1 Ra1 9.Rxa1 Qa7 10.Rb1 Qa1+ 11.Kxa1 Ra8+ 12.Kb2 Be8 13.Bh3#
+- (128.00)
92656kN

Can someone explain why I see lots of mate but only +2.xx evaluation?
Is this a bug?

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MikeB
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Re: another hard position (mate in 18) from 1998, by Ed Shröder

Post by MikeB » Sat Jan 04, 2020 7:28 pm

Hai wrote:
Sat Jan 04, 2020 2:51 pm
...

Can someone explain why I see lots of mate but only +2.xx evaluation?
Is this a bug?
It's the nature of NN - elevator explanation . plays millions of games and comes up with a scoring% for each move , but it's not real good at finding mates or even giving good lines for that move as compared to A/B engines. No bug.

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