4 old zugzwangs where modern engines still have troubles

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Vinvin
Posts: 5228
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

4 old zugzwangs where modern engines still have troubles

Post by Vinvin »

Selection from http://www.stmintz.com/ccc/index.php?id=392369

[d]6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - - bm Qxg2
; c0 "Kasparyan 1959, 1 ... Be5+ 2 Kf5! a1/Q 3 a7! Qxa7 4 Kg6! Qa1! 5 Qd5! Kh8 6 Qe4!!, white wins"; id "ZPTS.14";


[d]8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - bm Qxh4+
; c0 "CCC post 10.9.2004 by Alvaro Begue"; id "ZPTS.18";


[d]8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - bm Kd3
; c0 "CCC post by Tim Foden, id MES.831, white wins, 1. Kd3 g3 2. f4 Kf1 3. Kd2+ Kg1 4. Bd7 Kf1 5. Bh3 Rg1 6. Bg4 Rh1 7. Be2+ Kg1 8. Nc3 Kf2 9. Ne4+ Kg1 10. Ng5 Kf2 11. Nh3#"; id "ZPTS.21";


[d]8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - - bm Be4
; c0 "Kubbel 1925, 1.Be4!! Qh6 2.Bd3!! Qd2 [2...Qd6 3.b3#] 3.Be2 g6 [3...Qc2 4.Bd1 Qxd1 5.Nc3 -; 3...a6 4.f3 g6 5.f4 -] 4.f3 a6 5.f4 Qc2 6.Bd1, Zugzwang after f4, white wins"; id "ZPTS.28";
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F. Bluemers
Posts: 868
Joined: Thu Mar 09, 2006 11:21 pm
Location: Nederland

Re: 4 old zugzwangs where modern engines still have troubles

Post by F. Bluemers »

Well,maybe not.
Dirty beta,single core on fx8350 (3.7 Ghz)
[d]6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - - bm Qxg2

Code: Select all

19	+7.37 	17.0M  	0:10.35	Qxg2 Be5+ Kf5 a1=Q a7 Bxd6 a8=Q+ Qxa8 Qxa8+ Kf7 Kxg4 Ke7 Qe4+ Kd8 Qb1 Kc7 Qxb3 Bc5 Qd5 d6 Qe4 Kb6 Kf4
 18	+7.40 	14.2M  	0:08.73	Qxg2 Be5+ Kf5 a1=Q a7 Bxd6 a8=Q+ Qxa8 Qxa8+ Kf7 Kxg4 Ke7 Qe4+ Kd8 Qb1 Kc7 Qxb3 Bc5 Qd5 d6 Qe4 Kd7 Qb7+ Ke6 Qe4+ Kd7
 18	+7.40 	12.9M  	0:08.01	Qxg2 Be5+ Kf5 a1=Q a7 Bxd6 a8=Q+ Qxa8 Qxa8+ Kf7 Kxg4 Ke7 Qe4+ Kd8 Qb1 Kc7 Qxb3 Bc5 Qd5 d6 Qe4 Kd7 Qb7+ Ke6 Qe4+ Kd7
 17	+7.18 	11.0M  	0:06.84	Qxg2 Be5+ Kf5 a1=Q a7 Bxd6 a8=Q+ Qxa8 Qxa8+ Kf7 Kxg4 b2 Qa2+ Kf6 Qxb2+ Be5 Qb1 d6 Qf5+ Ke7 Kf3 Bf6 Qe4+ Be5
 17	+7.18 	10.0M  	0:05.89	Qxg2 Be5+ Kf5 a1=Q a7 Bxd6 a8=Q+ Qxa8 Qxa8+ Kf7 Kxg4 b2 Qa2+ Kf6 Qxb2+ Be5 Qb1 d6 Qf5+ Ke7 Kf3 Bf6 Qe4+ Be5
 17	+3.75!	7.84M  	0:04.84	Qxg2 Be5+ Kf5 a1=Q a7 Qxa7 Kg6 Qa1 Qd5+ Kh8 Qe4 Qb1 Qxb1 g3 Qxb3 Bxd6 Qb2+ Kg8!
 17	+2.50 	7.84M  	0:04.29	a7 Be5+ Kf5 Bxg3 a8=Q+ Kg7 Qa7 g1=Q Qxg1 Bxd6 Qxg4+ Kf8 Qd4 Ba3 Qh8+ Kf7 Qc3 Ke7 Qg7+ Ke8 Qe5+ Kf7 Qe7+ Kxe7 Kg6
 16	+2.26 	7.21M  	0:03.95	a7 Be5+ Kf5 Bxg3 a8=Q+ Kg7 Qa7 g1=Q Qxg1 Bxd6 Qxg4+ Kf8 Qd4 Ba3 Qh8+ Ke7 Qa1 Kd6 Qc3 Bc5
 16	+2.26 	6.96M  	0:03.81	a7 Be5+ Kf5 Bxg3 a8=Q+ Kg7 Qa7 g1=Q Qxg1 Bxd6 Qxg4+ Kf8 Qd4 Ba3 Qh8+ Ke7 Qa1 Kd6 Qc3 Bc5
[d]8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - bm Qxh4+

Code: Select all

16	+4.98 	1.20M  	0:00.87	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1 h4 Ke2
 16	+4.98 	1.00M  	0:00.75	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1 h4 Ke2
 15	+4.82 	966829	0:00.73	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1 h4
 15	+4.82 	828428	0:00.64	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1 h4
 14	+4.81 	804182	0:00.62	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1
 14	+4.81 	720306	0:00.54	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6 Kf1
 13	+4.79 	707697	0:00.54	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6
 13	+4.79 	707697	0:00.54	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qg1+ Kxg1 g4 f4 g3 f5 Kg5 f6 Kg6
 13	+0.97!	683420	0:00.51	Qxh4+ Kxh4 Bf6+ g5 Bc3 Qf2 Be5 Qxg2+ Kxg2 g4 fxg4 hxg4 Kf2 g3+ Bxg3+ Kg4!
 13	 -0.28 	618742	0:00.46	Bh6+ Kxh6 Qxh4 Qe5+ Kg1 g5 Qf2 Qa1+ Kh2 Qf6 Qe3 Qd6+ g3 Qf6 Qc5 h4 gxh4
 12	 -0.33 	330976	0:00.26	Bh6+ Kxh6 Qxh4 Qe5+ Qg3 Qf6 Qe1 g5 Kg1 h4 Qe3 Kg7 Kf1 Qa1+ Ke2 Qa2+ Qd2
[d]8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - bm Kd3

Code: Select all

25	  #11 	29.0M  	0:14.28	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1 Be2+ Kg1 Nc3
 25	  #11 	20.4M  	0:10.32	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1
 24	  #11 	18.0M  	0:09.23	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1 Be2+ Kg1 Nc3 Kf2 Ne4+ Kg1 Ng5 Kf2 Nh3#
 24	  #11 	16.1M  	0:08.31	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1
 23	  #11 	10.6M  	0:05.70	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1 Be2+ Kg1 Nc3 Kf2 Ne4+ Kg1 Ng5 Kf2 Nh3#
 23	  #11 	6.75M  	0:03.84	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1 Be2+ Kg1 Nc3
 22	  #11 	6.12M  	0:03.51	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1
 22	  #11 	6.11M  	0:03.51	Kd3 g3 f4 Kf1 Kd2+ Kg1 Bd7 Kf1 Bh3 Rg1 Bg4 Rh1
 22	  #11!	3.31M  	0:02.23	Kd3!
 22	  0.00 	3.31M  	0:01.78	Ne3 g3 fxg3
 21	  0.00 	3.18M  	0:01.73	Ne3 g3 fxg3
[d]8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - - bm Be4

Code: Select all

29	+2.56 	210.2M	2:23.89	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Ne3+ Kxd4 Ng2 Ke5 Kb3 Kf5 Kc4 g5 hxg5 Kxg5 Kd3 h4 f4+ Kg4 Ke4 h3 Ne3+ Kg3 Nf1+ Kg2 Nd2
 28	+2.86 	160.2M	1:40.12	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Ne3+ Kxd4 Ng2 Ke5 Ka3 Kf5 Ka4 g5 Kxa5 gxh4 Nxh4+ Kg5 Ng2
 28	+2.86 	138.8M	1:22.81	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Ne3+ Kxd4 Ng2 Ke5 Ka3 Kf5 Ka4 g5 Kxa5 gxh4 Nxh4+ Kg5 Ng2
 27	+2.86 	121.0M	1:11.14	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Ne3+ Kxd4 Ng2 Ke5 Ka3 Kf5 Ka4 g5 Kxa5 gxh4 Nxh4+ Kg5 Ng2
 27	+2.86 	98.1M  	0:57.03	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Ne3+ Kxd4 Ng2 Ke5 Ka3 Kf5 Ka4 g5 Kxa5 gxh4 Nxh4+ Kg5 Ng2
 26	+2.91 	81.8M  	0:45.93	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Nc3 Kxd4 Ka3 Ke5 Ne2 Kf6 Ka4 g5 hxg5+ Kxg5 Kxa5 h4 Ng1 Kf5
 26	+2.91 	79.8M  	0:44.78	Be4 Qh6 Bd3 Qd2 Be2 g6 f3 Qc2 Bd1 Qxd1 Nc3+ Kb4 Nxd1 Kc4 Nc3 Kxd4 Ka3 Ke5 Ne2 Kf6 Ka4 g5 hxg5+ Kxg5 Kxa5 h4 Ng1 Kf5
 26	+1.25!	52.7M  	0:32.26	Be4 Qh6 Bd3 Qd2 Be2 a6 f3 g5 hxg5 h4 g6 h3 g7 Qxd4 g8=Q Qd2 Bxa6 Qh6 Nc3+ Kb4 Qg4+ Kc5 Ne4+ Kb4 b3 a4 bxa4 Kxa4!
 26	  0.00 	48.0M  	0:23.96	b3+ Kb5 Nc7+ Kb6 Nd5+ Kb5
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User avatar
Eelco de Groot
Posts: 4561
Joined: Sun Mar 12, 2006 2:40 am
Full name:   

Re: 4 old zugzwangs where modern engines still have troubles

Post by Eelco de Groot »

Rainbow Serpent thinks the first one is about Mate in 22:

[D]6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - -

Engine: Rainbow Serpent 20160626 023 MP (32 bit, 4 threads, i7 6700, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

20/37 0:01 0.00 1.Qe1 Bc3 2.Qxc3 g1Q 3.Qxb3+ Kf8
4.Qxa2 Qd4+ 5.Kf5 Qd3+ 6.Kxg4 Qd4+
7.Kh3 Qe3+ 8.Kh2 Qe5+ 9.Kg2 Qe4+
10.Kh3 Qe3+ (11.177.888) 8123
.
.
.
26/37 0:21 0.00 1.Qe1 Bc3 2.Qxc3 g1Q 3.Qxb3+ Kf8
4.Qxa2 Qd4+ 5.Kf5 Qd3+ 6.Kxg4 Qd4+
7.Kh3 Qe3+ 8.Kg4 Qe4+ 9.Kh3 Qe3+ (176.358.983) 8326

27/37 0:35 +0.07++ 1.Qxg2 (300.402.298) 8443

27/37 0:37 +0.15++ 1.Qxg2 (312.581.488) 8425
.
.
.
27/59 1:18 +39.62 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7
4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7
7.Qxa2 Bd4 8.Qb3 Bf6 9.Kxg4 Kh6
10.Kf5 Bd4 11.Qh3+ Kg7 12.Qg2+ Kf8
13.Qa8+ Kg7 14.Qe4 (645.598.103) 8207
.
.
.
36/59 5:04 +123.44++1.Qxg2 (2.559.205.394) 8399

36/59 5:21 +M55++ 1.Qxg2 (2.701.505.892) 8412

36/59 5:44 +M47 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7
4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7
7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6
10.Qd3+ Kf6 11.Qxd4+ Ke6 12.Qxb2 Kxd6
13.Qb5 Ke6 14.Kf4 (2.910.728.569) 8441

37/59 6:40 +M54 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7
4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7
7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6
10.Qd3+ Kf6 11.Qxd4+ Ke6 12.Qxb2 Kxd6
13.Qb5 Ke6 14.Kf4 (3.399.995.099) 8498

38/59 6:47 +M44++ 1.Qxg2 (3.466.109.665) 8499

38/59 7:55 +M34++ 1.Qxg2 (4.062.067.208) 8534

38/59 9:34 +M23 1.Qxg2 Be5+ 2.Kf5 Kh7 3.a7 b2 4.Qh1+ Kg7
5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4
8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6
11.Qxd4+ Ke6 12.Qxb2 Kd5 13.Qb5+ Kxd6
14.Kf5 (4.958.995.895) 8636

39/59 10:39 +M23 1.Qxg2 Be5+ 2.Kf5 Kh7 3.a7 b2 4.Qh1+ Kg7
5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3
8.Qb3 Bd4 9.Qd3 Kh6 10.Kxg4 Bc3
11.Kf5 Bd4 12.Qe4 Bc3 13.Qe3+ Kh7
14.Qd3 (5.561.629.444) 8693

40/59 12:33 +M22 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7
4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7
7.Qxa2 Bc3 8.Qb3 Kh6 9.Kxg4 Kg6
10.Qc2+ Kf6 11.Qxc3+ Ke6 12.Qxb2 Kxd6
13.Qb5 Kc7 14.Kf5 (6.602.634.265) 8766

41/59 15:10 +M22 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7
4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7
7.Qxa2 Bc3 8.Qb3 Bd4 9.Qd3 Kh6
10.Kxg4 Bc3 11.Kf5 Bd4 12.Qe4 Bc3
13.Qe3+ Kh7 14.Qd3 (8.046.156.215) 8840

best move: Qg3xg2 time: 15:17.359 min n/s: 8.840.890 nodes: 8.110.313.227
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: 4 old zugzwangs where modern engines still have troubles

Post by kgburcham »

[D] 6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - -


Engine: Komodo 10 64-bit (8192 MB)
by Don Dailey, Larry Kaufman, Mark Lefler
Threads now set to 8
20.00 0:01 +0.65++ 1.Qxg2 Be5+ 2.Kf5 (36.836.900) 24665
20.00 0:01 +0.80++ 1.Qxg2 Be5+ 2.Kf5 (38.470.578) 24700
20.00 0:01 +1.02++ 1.Qxg2 Be5+ 2.Kf5 (39.887.831) 24705
20.00 0:01 +1.35++ 1.Qxg2 Be5+ 2.Kf5 (41.312.792) 24699
20.00 0:01 +1.84++ 1.Qxg2 Be5+ 2.Kf5 (43.469.724) 24703
20.00 0:01 +2.57++ 1.Qxg2 Be5+ 2.Kf5 (46.056.441) 24659
20.00 0:02 +3.66++ 1.Qxg2 Be5+ 2.Kf5 (51.499.104) 24281
20.00 0:02 +4.26 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.a8Q b1Q+ 6.Kxe5 Qb2+ 7.Ke4 Qb4+ 8.Kf5 Qc5+ 9.Kxg4 Qc4+ 10.Kg3 Qc3+ 11.Kf4 Qf6+ 12.Ke4 Qe6+ 13.Kd4 Qxd6+ 14.Kc4 (58.161.497) 23943
21.00 0:02 +4.19-- 1.Qxg2 Be5+ (65.180.955) 24120
21.00 0:03 +4.12-- 1.Qxg2 Be5+ (73.261.225) 24343
21.01 0:03 +4.02-- 1.Qxg2 Be5+ (74.083.125) 24372
21.01 0:03 +3.87-- 1.Qxg2 Be5+ (75.133.922) 24413
21.01 0:03 +3.65-- 1.Qxg2 Be5+ (75.715.588) 24435
21.01 0:03 +3.81++ 1.Qxg2 Be5+ 2.Kf5 (79.034.155) 24509
21.01 0:03 +4.30++ 1.Qxg2 Be5+ 2.Kf5 (81.152.964) 24511
21.01 0:03 +5.03++ 1.Qxg2 Be5+ 2.Kf5 (84.195.687) 24562
21.01 0:03 +6.12++ 1.Qxg2 Be5+ 2.Kf5 (90.608.115) 24635
21.01 0:03 +6.40 1.Qxg2 Be5+ 2.Kf5 Kh7 3.a7 b2 4.Qh1+ Kg7 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb1 g3 9.Qe4 Bd2 10.Qe7+ Kh8 11.Qd8+ Kg7 12.Qxd7+ Kf8 13.Qe7+ Kg8 14.Qe6+ (93.528.929) 24664
22.01 0:04 +6.47++ 1.Qxg2 Be5+ 2.Kf5 (99.928.702) 24782
22.01 0:04 +6.54++ 1.Qxg2 Be5+ 2.Kf5 (102.120.663) 24826
22.01 0:04 +6.64++ 1.Qxg2 Be5+ 2.Kf5 (103.574.007) 24847
22.01 0:04 +6.68 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Bf6 11.Qh1+ Kg7 12.Kf5 Bd4 13.Qg2+ Kf8 14.Qb7 (106.646.537) 24879
23.01 0:04 +6.75++ 1.Qxg2 Be5+ 2.Kf5 (118.398.691) 25032
23.01 0:04 +6.76 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Bf6 11.Qh1+ Kg7 12.Kf5 Bd4 13.Qe4 Kh7 14.Qh4+ (121.656.563) 25043
24.01 0:05 +6.83++ 1.Qxg2 Be5+ 2.Kf5 (137.249.811) 25182
24.01 0:05 +6.90++ 1.Qxg2 Be5+ 2.Kf5 (141.727.314) 25243
24.01 0:05 +7.00++ 1.Qxg2 Be5+ 2.Kf5 (146.432.255) 25318
24.01 0:06 +7.05 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Bf6 11.Qh1+ Kg7 12.Kf5 Bd4 13.Qg2+ Kf8 14.Qb7 (155.659.227) 25356
25.01 0:07 +7.12++ 1.Qxg2 Be5+ 2.Kf5 (178.849.120) 25461
25.01 0:07 +7.12 1.Qxg2 Be5+ 2.Kf5 Kh7 3.a7 b2 4.Qh1+ Kg7 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Bf6 11.Qh1+ Kg7 12.Kf5 Bd4 13.Qg2+ Kf8 14.Qb7 (188.169.271) 25463
26.01 0:08 +7.19++ 1.Qxg2 Be5+ 2.Kf5 (228.595.676) 25582
26.01 0:09 +7.35 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Bf6 11.Qh1+ Kg7 12.Kf5 Bd4 13.Qe4 Kf7 14.Qe7+ (250.372.338) 25583
27.01 0:11 +7.42++ 1.Qxg2 Be5+ 2.Kf5 (300.338.027) 25677
27.01 0:14 +9.61 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb5 Kh6 10.Kxg4 Kg6 11.Qd3+ Kf6 12.Qf5+ Kg7 13.Qxd7+ Kg6 14.Qf5+ (386.457.176) 25805
28.01 0:17 +9.61 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bc3 8.Qb3 Bd4 9.Qb7 Kh6 10.Kxg4 Kg6 11.Qe4+ Kf6 12.Qf5+ Kg7 13.Qxd7+ Kg6 14.Qf5+ (454.938.820) 25822
29.01 0:21 +9.68++ 1.Qxg2 Be5+ 2.Kf5 (548.391.488) 25944
29.01 0:30 +M27 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kh7 7.Qxa2 Bc3 8.Qb1 Kg7 9.Kxg4 Kf6 10.Qf5+ Kg7 11.Qxd7+ Kf6 12.Qe7+ Kg6 13.Qe6+ Kg7 14.Qb3 (796.279.300) 26326
30.01 0:33 +M25 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (881.584.613) 26452
31.01 0:36 +M25 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (968.814.920) 26449
32.01 0:42 +M25 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (1.122.618.692) 26513
33.01 0:52 +M25 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (1.400.962.870) 26603
34.01 1:10 +M25 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (1.889.058.656) 26629
35.01 1:40 +M24 1.Qxg2 Be5+ 2.Kf5 Kh7 3.Qh1+ Kg7 4.a7 b2 5.Qh8+ Kxh8 6.a8Q+ Kg7 7.Qxa2 Bd4 8.Qb3 Kh6 9.Kxg4 Kg6 10.Qd3+ Kf6 11.Qf5+ Kg7 12.Qxd7+ Kg6 13.Qe6+ Kg7 14.Qe4 (2.664.745.311) 26619
best move: Qg3xg2 time: 1:44.625 min n/s: 26.613.280 nodes: 2.784.567.958


[D] 8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - -

27.00 0:01 +15.43 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf2 Ke4 9.Ke2 Kd5 10.Ke3 Ke6 11.Ke4 Ke7 12.f5 Ke8 13.Kf4 Kd7 14.Kg5 (47.579.352) 24024
28.00 0:02 +15.51++ 1.Qxh4+ Kf5 2.Qh3+ (57.228.223) 24088
28.00 0:02 +17.18 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf2 Ke4 9.Ke2 Kd5 10.Ke3 Ke6 11.Ke4 Ke7 12.f5 Ke8 13.f6 Kd8 14.Kf5 (60.339.381) 24146
29.00 0:02 +17.18 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf2 Ke4 9.Ke2 Kd5 10.Ke3 Ke6 11.Ke4 Ke7 12.f5 Ke8 13.f6 Kd8 14.Kf5 (69.479.486) 24182
30.01 0:03 +17.25++ 1.Qxh4+ Kxh4 2.Bf6+ (95.810.705) 24122
30.01 0:04 +17.45 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf2 Ke4 9.Ke2 Kd5 10.Ke3 Ke6 11.Ke4 Ke7 12.f5 Ke8 13.f6 Kd8 14.Kf4 (98.764.227) 24177
31.01 0:06 +17.52++ 1.Qxh4+ Kxh4 2.Bf6+ (153.611.918) 24101
31.01 0:06 +17.78 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf2 Ke4 9.Ke2 Kd5 10.Ke3 Ke6 11.Ke4 Ke7 12.f5 Ke8 13.f6 Kd8 14.Kf4 (158.875.484) 24149
32.01 0:07 +17.94++ 1.Qxh4+ Kf5 2.Qh3+ (189.997.157) 24155
32.01 0:09 +M31 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf1 Kg6 9.Ke2 Kh6 10.Ke3 h4 11.gxh4 g3 12.Kf3 g2 13.Kxg2 Kg6 14.Kg3 (230.232.246) 24477
33.01 0:14 +M31 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf1 Kg6 9.Ke2 Kh6 10.Ke3 h4 11.gxh4 g3 12.Kf3 g2 13.Kxg2 Kg6 14.Kg3 (348.122.560) 24413
34.01 0:21 +M31 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf1 Kg6 9.Ke2 Kh6 10.Ke3 h4 11.gxh4 g3 12.Kf3 g2 13.Kxg2 Kg6 14.Kg3 (553.420.358) 25365
35.01 0:31 +M31 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf1 Kg6 9.Ke2 Kh6 10.Ke3 h4 11.gxh4 g3 12.Kf3 g2 13.Kxg2 Kg6 14.Kg3 (790.871.174) 25201
36.01 0:48 +M31 1.Qxh4+ Kxh4 2.Bf6+ g5 3.Bc3 Qf2 4.Be5 Qg1+ 5.Kxg1 g4 6.g3+ Kg5 7.f4+ Kf5 8.Kf1 Kg6 9.Ke2 Kh6 10.Ke3 h4 11.gxh4 g3 12.Kf3 g2 13.Kxg2 Kg6 14.Kg3 (1.218.823.731) 25185
best move: Qh3xh4 time: 0:50.875 min n/s: 25.195.733 nodes: 1.281.611.951


[D] 8/8/8/1B6/6p1/8/4KPpp/3N2kr w - -

33.00 0:01 0.00 1.Ne3 g3 2.fxg3 (38.401.700) 24756
34.00 0:01 0.00 1.Ne3 g3 2.fxg3 (47.731.009) 24725
35.01 0:03 0.00 1.Ne3 g3 2.fxg3 (95.394.174) 28660
36.01 0:04 0.00 1.Ne3 g3 2.fxg3 (113.307.000) 27929
37.01 0:05 0.00 1.Ne3 g3 2.fxg3 (149.742.637) 27577
38.01 0:06 0.00 1.Ne3 g3 2.fxg3 (173.366.305) 27243
39.01 0:07 0.00 1.Ne3 g3 2.fxg3 (211.517.434) 26758
40.01 0:10 0.00 1.Ne3 g3 2.fxg3 (267.120.049) 26189
41.01 0:16 0.00 1.Ne3 g3 2.fxg3 (454.177.602) 27867
42.01 0:18 0.00 1.Ne3 g3 2.fxg3 (520.207.521) 27571
42.11 0:24 +M11++ 1.Kd3 g3 2.f4 (688.923.130) 28274
42.01 0:25 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (713.046.276) 28239
43.01 0:25 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (722.636.299) 28228
44.01 0:26 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (743.347.588) 28238
45.01 0:27 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (765.284.314) 28235
46.01 0:28 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (797.249.608) 28256
47.01 0:29 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (836.279.000) 28278
48.01 0:30 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (870.411.911) 28312
49.01 0:32 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (934.727.557) 28348
50.01 0:34 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (987.721.543) 28400
51.01 0:37 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.068.011.359) 28471
52.01 0:40 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.151.501.123) 28541
53.01 0:43 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.245.896.208) 28643
54.01 0:46 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.335.956.442) 28728
55.01 0:50 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.463.009.382) 28828
56.01 0:54 +M11 1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3+ (1.578.425.225) 28916
best move: Ke2-d3 time: 0:54.781 min n/s: 28.920.933 nodes: 1.584.173.288


[D] 8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - -

28.00 0:01 0.00 1.b3+ Kb5 2.Nc7+ Kb6 3.Nd5+ Ka6 4.Nc7+ Kb6 (35.259.333) 22052
29.00 0:01 0.00 1.b3+ Kb5 2.Nc7+ Kb6 3.Nd5+ Ka6 4.Nc7+ Kb6 (41.629.492) 22189
29.00 0:02 +0.07++ 1.Be4 Qh6 2.Bd3 (56.983.784) 21919
29.00 0:02 +0.14++ 1.Be4 Qh6 2.Bd3 (60.834.946) 22019
29.00 0:02 +0.24++ 1.Be4 Qh6 2.Bd3 (65.008.815) 22120
29.00 0:03 +0.39++ 1.Be4 Qh6 2.Bd3 (72.326.557) 22137
29.01 0:03 +0.61++ 1.Be4 Qh6 2.Bd3 (80.688.506) 22330
29.01 0:03 +0.94++ 1.Be4 Qh6 2.Bd3 (89.068.130) 22403
29.01 0:04 +1.43++ 1.Be4 Qh6 2.Bd3 (95.809.565) 22459
29.01 0:04 +2.16++ 1.Be4 Qh6 2.Bd3 (101.450.143) 22434
29.01 0:04 +3.25++ 1.Be4 Qh6 2.Bd3 (110.809.050) 22470
29.01 0:05 +4.88++ 1.Be4 Qh6 2.Bd3 (128.167.706) 22317
29.01 0:06 +4.88 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Kd3 10.Nf4+ Ke3 11.Nxg6 Kxf3 12.Kb3 Ke2 13.Ka4 Ke3 14.Kxa5 (145.901.930) 22300
30.01 0:06 +4.95++ 1.Be4 Qh6 2.Bd3 (155.034.463) 22327
30.01 0:07 +5.02++ 1.Be4 Qh6 2.Bd3 (157.728.834) 22326
30.01 0:07 +5.12++ 1.Be4 Qh6 2.Bd3 (160.118.515) 22344
30.01 0:07 +5.27++ 1.Be4 Qh6 2.Bd3 (163.363.503) 22378
30.01 0:07 +5.49++ 1.Be4 Qh6 2.Bd3 (168.525.156) 22394
30.01 0:08 +5.82++ 1.Be4 Qh6 2.Bd3 (179.991.845) 22385
30.01 0:08 +6.31++ 1.Be4 Qh6 2.Bd3 (193.135.414) 22359
30.01 0:09 +6.82 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Ka3 Kf5 11.Ka4 g5 12.hxg5 Kxg5 13.Kxa5 Kf6 14.Ka6 (216.770.478) 22373
31.01 0:12 +6.82 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Ka3 Kf5 11.Ka4 g5 12.hxg5 Kxg5 13.Kxa5 Kf6 14.Ka6 (269.725.410) 22467
32.01 0:13 +6.89++ 1.Be4 Qh6 2.Bd3 (306.926.683) 22511
32.01 0:14 +6.96++ 1.Be4 Qh6 2.Bd3 (315.298.479) 22513
32.01 0:17 +7.21 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Ka3 Kd4 11.Ka4 Kd3 12.Kxa5 Ke2 13.Nf4+ Ke3 14.Nxg6 (402.555.916) 22696
33.01 0:25 +7.21 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Kb3 Kd4 11.Ka4 Kd3 12.Nf4+ Kd2 13.Nxg6 Ke3 14.Kb5 (576.987.079) 22860
34.01 0:34 +7.28++ 1.Be4 Qh6 2.Bd3 (792.590.037) 23061
34.01 0:53 +9.59 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Kb3 Kd4 11.Ka4 Kd3 12.Nf4+ Kd2 13.Nxg6 Ke3 14.Kxa5 (1.253.348.773) 23285
35.01 1:04 +9.59 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Ke5 10.Kb3 Kd4 11.Ka4 Kd3 12.Nf4+ Kd2 13.Nxg6 Ke3 14.Kxa5 (1.513.322.327) 23441
36.01 1:21 +9.59 1.Be4 Qh6 2.Bd3 Qd2 3.Be2 g6 4.f3 Qc2 5.Bd1 Qxd1 6.Nc3+ Kb4 7.Nxd1 Kc4 8.Ne3+ Kxd4 9.Ng2 Kc4 10.Ka3 Kd3 11.Nf4+ Ke3 12.Nxg6 Kxf3 13.Ka4 Ke3 14.Kxa5 (1.912.722.640) 23606
37.01 1:51 +9.66++ 1.Be4 Qh6 2.Bd3 (2.651.822.008) 23833
best move: Bg2-e4 time: 1:53.828 min n/s: 23.835.718 nodes: 2.713.069.216
no chess program was born totally from one mind. all chess programs have many ideas from many minds.
Top
Dann Corbit
Posts: 12537
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: 4 old zugzwangs where modern engines still have troubles

Post by Dann Corbit »

Stockfish had a very hard time and Komodo 10 crashed.

Matefinder solves 3/4 quickly, but has a hard time on the one.

Asmfish, which may be the strongest engine (at least with quick time control) in the world according to this test:
http://spcc.beepworld.de/
had a terrible time.
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.
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jhellis3
Posts: 546
Joined: Sat Aug 17, 2013 12:36 am

Re: 4 old zugzwangs where modern engines still have troubles

Post by jhellis3 »

Which one did MF struggle with? These relatively simple positions where it still fails are always good to help me improve it.
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yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: 4 old zugzwangs where modern engines still have troubles

Post by yanquis1972 »

Dann Corbit wrote:Stockfish had a very hard time and Komodo 10 crashed.

Matefinder solves 3/4 quickly, but has a hard time on the one.

Asmfish, which may be the strongest engine (at least with quick time control) in the world according to this test:
http://spcc.beepworld.de/
had a terrible time.
might want to retry-- K10 spit through all of them but the last quite quickly, & still found the final position in a couple minutes for me (using 6 man syzygys on an HDD).

edit -- missed the Be4 position, so i havent ran that.

kgburchams results are with null move disabled, although he fails to mention it....
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Dann Corbit
Posts: 12537
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: 4 old zugzwangs where modern engines still have troubles

Post by Dann Corbit »

I have the same configuration.
On a second pass, K10 solved 2 out of 4 quickly.
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.
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Dann Corbit
Posts: 12537
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: 4 old zugzwangs where modern engines still have troubles

Post by Dann Corbit »

[d]6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - -

@3minutes:

Code: Select all

infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0

 1   +4.62   00:00      34  Qxg2 
 2   +5.09   00:00     156  Qxb3+ Kg7 Qb6 
 3   -0.32   00:00     580  Qxb3+ Kg7 Qd1 Bf6 
 4   -0.44   00:00     787  Qxb3+ Kg7 Qd1 Bf6 Qxg4+ Kf8 
 5   -0.33   00:00    1323  Qxg2 Be5+ Kxe5 a1=Q+ Ke4 Qa4+ Kf5 Qxa6 
 6   -0.69   00:00    2323  Qxg2 Be5+ Kxe5 a1=Q+ Ke4 Qa4+ Ke3 Kf7 Qd5+ Kf6 
 7   -0.69   00:00    3434  Qxg2 Be5+ Kxe5 a1=Q+ Ke4 Qa4+ Ke3 Kf7 Qd5+ Kf6 Qd4+ Qxd4+ Kxd4 
 8   +0.00   00:00    5106  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 
 9   +0.00   00:00    5682  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
10   +0.00   00:00    8926  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
11   +0.00   00:00   11748  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
12   +0.00   00:00   14720  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
13   +0.00   00:00   20010  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
14   +0.00   00:01   39756  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
15   +0.00   00:01   45412  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
16   +0.00   00:02   66684  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
17   +0.00   00:03  114535  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
18   +0.00   00:09  321785  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
19   +0.00   00:13  398447  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
20   +0.00   00:21  676004  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
21   +0.00   00:37   1030K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
22   +0.00   00:43   1177K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
23   +0.00   01:01   1845K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
24   +0.00   01:29   2843K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+ 
25   +0.00   02:06   4595K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kg6 Qf5+ Kh6 Qg5+ Kh7 Qf5+ Kg8 Qe6+ Kf8 Qc8+ Kf7 Qd7+ Kf6 Qf5+ Kg7 Qd7+
On a second pass, it did much better:

Code: Select all

Searching: 6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - - 0 1
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0

 1   +4.62   00:00      32  Qxg2 
 2   +0.67   00:00     720  Ke4 Bc3 Qxg4+ Kf7 
 3   -0.04   00:00     846  Ke4 Bc3 Qxg4+ Kf8 
 4   -0.37   00:00    1539  Qxg2 Be5+ Kxe5 a1=Q+ Ke4 b2 Qxg4+ Kf8 
 5   -1.00   00:00    2444  Qxg2 Be5+ Kxe5 a1=Q+ Kd5 Qa5+ Ke4 Qa4+ Ke5 Qb5+ Qd5+ Qxd5+ Kxd5 
 6   -0.60   00:00    3985  Kxg4 Be5 Qxg2 a1=Q a7 Qxa7 
 7   -0.92   00:00    5763  Qxg2 Be5+ Kxg4 a1=Q a7 Qxa7 Qd5+ Kh7 Qe4+ Kh6 
 8   -0.99   00:00    6863  Qxg2 Be5+ Kxg4 a1=Q a7 Qxa7 Qd5+ Kh7 Qe4+ Kh6 Qxe5 
 9   +0.00   00:00   16685  Qxb3+ Kf8 Qb8+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
10   +0.00   00:00   26850  Qxb3+ Kf8 Qb8+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
11   +0.00   00:00   31536  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
12   +0.00   00:00   32458  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
13   +0.00   00:00   33692  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
14   +0.00   00:00   37076  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
15   +0.00   00:00   47738  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
16   +0.00   00:00   90533  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
17   +0.00   00:00  143398  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
18   +0.00   00:00  227955  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
19   +0.00   00:01  544334  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
20   +0.00   00:02  894091  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
21   +0.00   00:02   1187K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
22   +0.00   00:05   1724K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
23   +0.00   00:07   2287K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
24   +0.00   00:13   3557K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
25   +0.00   00:17   4819K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
26   +0.00   00:34  11065K  Qxb3+ Kg7 Qb5 g1=Q Qxd7+ Kh8 Qc8+ Kh7 Qf5+ Kh8 Qc8+ 
27  +49.92   02:10  33382K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 Bc3 a8=Q Qxa8 Qxa8 b2 Qe4 Kh6 Kxg4 Bd4 Kf5 Bc3 Qf4+ Kg7 Qg5+ Kh7 Qh4+ Kg7 Qe7+ Kh6 Qe4 Kg7 Kg4 Kh8 Qe8+ Kh7 Qxd7+ Kh6 
28 +122.87   02:20  37448K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 Bc3 a8=Q Qxa8 Qxa8 b2 Qe4 g3 Qh4+ Kg8 Qxg3+ Kf8 Qd3 Bb4 Kg6 b1=B Qxb1 Bxd6 Qe4 Ba3 Qa8+ Ke7 Qxa3+ Ke6 Qh3+ Kd6 Kf5 Kc6 
29 +122.87   02:20  37545K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 Bc3 a8=Q Qxa8 Qxa8 b2 Qe4 g3 Qh4+ Kg8 Qxg3+ Kf8 Qd3 Bb4 Kg6 b1=B Qxb1 Bxd6 Qe4 Ba3 Qa8+ Ke7 Qxa3+ d6 Kf5 Kd7 Qc3 Kd8 Qf6+ Kd7 Qg7+ Kc8 
30     #41   02:31  39886K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 Bd4 a8=Q Qxa8 Qxa8 b2 Qe4 Kh6 Kxg4 Bc3 Qe3+ Kh7 Qd3+ Kg8 Kf5 Kh7 Qh3+ Kg8 Qg2+ Kf7 Qd5+ Kg7 Qe4 Kh6 Qf4+ Kh7 Qh4+ Kg7 Qg5+ Kh7 Qg6+ Kh8 Qe8+ Kh7 Qxd7+ Bg7 
31     #32   02:36  40526K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 Bd4 a8=Q Qxa8 Qxa8 b2 Qe4 Kh6 Kxg4 Bc3 Kf5 Kg7 Qe7+ Kh6 Qg5+ Kh7 Qg6+ Kh8 Qe8+ Kh7 Qxd7+ Kg8 Qc8+ Kh7 Qb7+ Kh6 d7 Ba5 Qxb2 Kh7 Qh2+ Kg7 Qe5+ Kh7 Qxa5 
32     #28   03:06  44097K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf5 Kd5 Qb4 Kc6 Ke6 Kc7 
33     #28   03:07  44172K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf5 Kd5 Qb4 Kc6 Ke6 Kc7 Qb5 
34     #28   03:07  44183K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf5 Kd5 Qb4 Kc6 Ke6 Kc7 Qb5 Kc8 
35     #28   03:07  44281K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf5 Kd5 Qb4 Kc6 Ke6 Kc7 Qb5 Kc8 Kd6 
36     #28   03:09  45005K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf5 Kd5 Qb4 Kc6 Ke6 Kc7 Qb5 Kc8 Kd6 Kd8 
37     #28   03:15  46826K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qa4+ Kd6 Kf6 Kc5 Ke5 Kb6 Kd6 Kb7 Qb4+ Ka7 Kc6 Ka8 Qb7+ 
38     #28   03:20  48139K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qd5+ Kc8 Kf4 Kb8 Ke5 Kc7 Qb5 Kd8 Qb7 Ke8 Ke6 Kf8 Qf7+ 
39     #28   04:25  64013K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd5+ Ke7 a8=Q Qh7+ Kxg4 Qg7+ Qg5+ Qxg5+ Kxg5 Kd7 Qd5+ Kc8 Kf4 Kb8 Ke5 Kc7 Qb5 Kd8 Qb7 Ke8 Ke6 Kf8 Qf7+ 
40     #26   04:25  64210K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
41     #26   04:37  72274K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
42     #26   04:44  75202K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
43     #26   07:10 115598K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
44     #26   08:10 144924K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
45     #26   08:13 145875K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
46     #26   09:58 205260K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
47     #26   11:44 270134K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
48     #26   15:00 398806K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
49     #26   15:06 403102K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+ 
50     #26   18:43 536463K  Qxg2 Be5+ Kf5 Kh7 Qe4 a1=Q a7 b2 Kg5+ Kg7 Qxe5+ Kh7 Qe7+ Kg8 Qe8+ Kg7 Qxd7+ Kg8 Qe8+ Kg7 Qe7+ Kg8 d7 Qc1+ Kh5 Qh1+ Qh4 Qxh4+ Kxh4 b1=Q d8=Q+ Kf7 Qd7+ Kf6 Qd6+ Kf7 a8=Q Qh7+ Kxg4 Qg7+ Kf4 Qf6+ Qxf6+ Kxf6 Qe8 Kg7 Kf5 Kh7 Kf6 Kh6 Qg6+
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.
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peter
Posts: 3185
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: 4 old zugzwangs where modern engines still have troubles

Post by peter »

Dann Corbit wrote:I have the same configuration.
On a second pass, K10 solved 2 out of 4 quickly.
And the two others on 24 threads with 32G hash, no Syzygys:

[d]8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - 0 1

Analysis by Komodo 10 64-bit:

1.Ne3 g3 2.fxg3
= (0.00) Depth: 7 00:00:00 34kN
...
1.Ne3 g3 2.fxg3
= (0.00) Depth: 75 00:03:04 7525MN
1.Kd3 g3 2.f4
= (0.07 ++) Depth: 75 00:11:12 19719MN
...
1.Kd3 g3 2.f4
+/= (0.39 ++) Depth: 75 00:12:05 21066MN
1.Kd3 g3 2.f4
+- (#11 ++) Depth: 75 00:27:00 48557MN
1.Kd3 g3 2.f4 Kf1 3.Kd2+ Kg1 4.Bd7 Kf1 5.Bh3 Rg1 6.Bg4 Rh1 7.Be2+ Kg1 8.Nc3 Kf2 9.Ne4+ Kg1 10.Ng5 Kf2 11.Nh3#
+- (#11) Depth: 75 00:27:00 48558MN


[d]8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - - 0 1

Analysis by Komodo 10 64-bit:

1.Bf1 Qc2 2.Nc3+ Kb4 3.Nd5+ Ka4
= (0.00) Depth: 7 00:00:02 1333kN
...
1.Bf1 Qc2 2.Nc3+ Kb4 3.Nd5+ Ka4
= (0.00) Depth: 51 00:00:12 276MN
1.Be4 Qh6 2.Bd3
= (0.07 ++) Depth: 51 00:01:25 4033MN
...
1.Be4 Qh6 2.Bd3
+- (3.25 ++) Depth: 51 00:09:41 29639MN
1.Be4 Qh6 2.Bd3
+- (4.88 ++) Depth: 51 00:10:02 30253MN

No longer PV after about an hour
Peter.
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