A hard endgame (?) study

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Arpad Rusz
Posts: 273
Joined: Sat Apr 17, 2010 2:34 pm
Location: Budapest

A hard endgame (?) study

Post by Arpad Rusz »

The following study has at least five variations with queen sacrifices which makes it hard for the engines. White wins!

[pgn][Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]

1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0[/pgn]
User avatar
Nordlandia
Posts: 2821
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: A hard endgame (?) study

Post by Nordlandia »

Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 0

Image

https://timkr.home.xs4all.nl/chess2/minor.htm
Joerg Oster
Posts: 937
Joined: Fri Mar 10, 2006 4:29 pm
Location: Germany

Re: A hard endgame (?) study

Post by Joerg Oster »

Arpad Rusz wrote:The following study has at least five variations with queen sacrifices which makes it hard for the engines. White wins!

[pgn][Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]

1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0[/pgn]
What's the continuation after 4. .. Rb2xc2 by Black? Still mate?
Jörg Oster
Paloma
Posts: 1167
Joined: Thu Dec 25, 2008 9:07 pm
Full name: Herbert L

Re: A hard endgame (?) study

Post by Paloma »

Joerg Oster wrote: What's the continuation after 4. .. Rb2xc2 by Black? Still mate?
Yes :P

[d] r7/1NP1N1Kp/pnQ1P1b1/5p2/3kn2p/p4BP1/1rPPp2q/8 b - - 0 4

4... Rxc2 5.Qxb6+ Kd3 6.Qe3+ Kc4 7.Bxe4 11#
:wink:
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: A hard endgame (?) study

Post by MikeGL »

Arpad Rusz wrote:The following study has at least five variations with queen sacrifices which makes it hard for the engines. White wins!

[pgn][Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]

1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0[/pgn]
Very nice tactical puzzle, tough for engines. But 3...Ne8+ seems to put up a stronger defence, though black would still lose after that move.

regards
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: A hard endgame (?) study

Post by MikeGL »

Nordlandia wrote:Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 1

Image

https://timkr.home.xs4all.nl/chess2/minor.htm

Good puzzle, even a8=N cannot win because of Rc8 which wins the N.
Tried almost all engines, all having difficulty finding a8(B).
kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: A hard endgame (?) study

Post by kgburcham »

[D] r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - -


Nalimov 6 men EGTB available - 999 MB cache
Engine: Houdini 5.01 Pro x64-pext (8192 MB)
by Robert Houdart
8 threads used

21/60 1:18 -3.95++ 1.Nec6+ (1.485.742.152) 18914 TB:92
21/60 1:21 -3.88++ 1.Nec6+ (1.537.238.488) 18929 TB:122
21/60 1:21 -3.95-- 1.Nec6+ Kc5 (1.551.138.331) 18933 TB:122
21/60 3:43 -3.95-- 1.Nec6+ Kc5 (4.098.827.171) 18340 TB:322
21/60 4:05 -3.63++ 1.d6 (4.480.628.291) 18253 TB:333
21/60 4:31 -3.42++ 1.d6 (4.928.400.875) 18183 TB:348
21/60 4:50 -3.15++ 1.d6 (5.271.469.667) 18174 TB:424
21/60 5:14 -2.79++ 1.d6 (5.730.378.019) 18198 TB:435
21/60 5:58 -2.32++ 1.d6 (6.511.876.682) 18141 TB:678
21/60 6:45 -1.75++ 1.d6 (7.357.851.086) 18131 TB:717
21/60 7:55 -1.06++ 1.d6 (8.657.373.828) 18222 TB:866
21/63 8:13 -1.62-- 1.d6 Nb6 (9.016.081.557) 18257 TB:1.062
21/63 8:28 -1.55 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Be2 Qxg3 10.Qxf1+ Kh2 11.Nxg6 hxg6 12.e7 a2 13.Bf3 Qe5+ 14.Kf7 (9.291.919.587) 18279 TB:1.105
21/63 8:28 -1.55 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Be2 Qxg3 10.Qxf1+ Kh2 11.Nxg6 hxg6 12.e7 a2 13.Bf3 Qe5+ 14.Kf7 (9.299.695.397) 18280 TB:1.105
22/63 8:45 -1.61-- 1.d6 Nb6 (9.621.515.041) 18297 TB:1.164
22/63 9:07 -1.68-- 1.d6 Nb6 (9.992.473.812) 18247 TB:1.263
22/63 9:15 -1.77-- 1.d6 Nb6 (10.128.972.444) 18230 TB:1.337
22/63 9:22 -1.90-- 1.d6 Nb6 (10.243.641.433) 18218 TB:1.344
22/63 9:29 -2.09-- 1.d6 Nb6 (10.369.551.505) 18203 TB:1.345
22/63 10:04 -2.09 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qxa2 Qxa2 14.e8Q (10.987.777.715) 18163 TB:1.586
22/63 10:05 -2.09 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qxa2 Qxa2 14.e8Q (10.990.668.893) 18163 TB:1.586
23/63 13:02 -2.02++ 1.d6 (14.192.244.898) 18140 TB:2.832
23/63 13:26 -2.01 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qe5 a1Q 14.Qxa1 (14.634.021.107) 18135 TB:3.099
23/63 13:45 -2.01 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qe5 a1Q 14.Qxa1 (14.967.144.896) 18136 TB:3.340
24/63 16:01 -2.01 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qe5 hxg3 14.e8Q (17.473.514.310) 18170 TB:4.556
24/63 16:30 -2.01 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2 7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Rxc2 10.Nc6 a2 11.e7 Qd2 12.Qa1 Rc1 13.Qe5 hxg3 14.e8Q (18.026.461.249) 18207 TB:5.662
24/68 17:52 -2.08-- 1.d6 Nb6 (19.649.774.117) 18316 TB:6.465
24/68 21:04 -2.01++ 1.d6 (23.324.341.667) 18451 TB:7.322
24/68 22:13 -1.92++ 1.d6 (24.656.351.785) 18494 TB:7.581
24/68 23:27 -1.79++ 1.d6 (26.056.513.058) 18509 TB:7.950
24/68 25:39 -1.61++ 1.d6 (28.349.121.321) 18416 TB:8.379
24/68 28:02 -1.37++ 1.d6 (30.911.051.982) 18375 TB:9.566
24/68 31:09 -1.04++ 1.d6 (34.473.051.237) 18439 TB:13.192
24/68 37:31 -0.56++ 1.d6 (41.491.091.531) 18431 TB:18.456
24/68 42:47 0.00 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ke5 4.Nxg6+ hxg6 5.Qc3+ Kxe6 6.Qf6+ Kd7 7.Bc6+ Kxc7 8.Qe7+ Nd7 9.Qxd7+ Kb6 10.Qxd6 Kxa5 11.Bxa8 Qxg3 12.Qd5+ Rb5 13.Qd8+ Ka4 14.Qd4+ (47.287.917.356) 18416 TB:21.537
24/68 42:58 0.00 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ke5 4.Nxg6+ hxg6 5.Qc3+ Kxe6 6.Qf6+ Kd7 7.Bc6+ Kxc7 8.Qe7+ Nd7 9.Qxd7+ Kb6 10.Qxd6 Kxa5 11.Bxa8 Qxg3 12.Qd5+ Rb5 13.Qd8+ Ka4 14.Qd4+ (47.500.516.213) 18420 TB:21.590
25/68 53:38 +0.08++ 1.d6 (59.153.380.764) 18378 TB:32.746
25/68 58:09 +0.17++ 1.d6 (64.175.500.846) 18388 TB:37.215
25/68 62:51 +0.30++ 1.d6 (69.373.903.938) 18393 TB:42.061
25/68 67:05 +0.49++ 1.d6 (74.272.324.659) 18449 TB:50.407
25/68 71:12 +0.72++ 1.d6 (79.105.110.722) 18515 TB:54.217
25/68 77:40 +1.00++ 1.d6 (86.418.243.282) 18540 TB:70.147
25/68 85:58 +1.33++ 1.d6 (95.590.040.814) 18530 TB:95.851
25/71 97:11 +1.74++ 1.d6 (107.863.660.336) 18496 TB:107.477
25/71 107:20 +2.31++ 1.d6 (119.380.867.917) 18536 TB:124.160
25/71 114:53 +2.31 1.d6 (127.996.487.398) 18568 TB:135.615
best move: d5-d6 time: 114:54.875 min n/s: 18.568.000 nodes: 127.996.487.398 TB: 135.615
no chess program was born totally from one mind. all chess programs have many ideas from many minds.
User avatar
AdminX
Posts: 6340
Joined: Mon Mar 13, 2006 2:34 pm
Location: Acworth, GA

Re: A hard endgame (?) study

Post by AdminX »

[d]r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - -

Engine: AsmFish [6 Threads] (6144 MB)
by TypingALot

1/02 0:00 -10.60 1.Bxe2 (3.554) 3554

2/02 0:00 -10.44 1.Bxe2 a2 2.Nac6+ Kc5 (7.803) 7803

3/04 0:00 -10.39 1.Bxe2 a2 2.c3+ Ke4 (8.180) 8180

4/06 0:00 -9.93 1.Bxe2 a2 2.c3+ Ke4 3.d6+ Ke5 (11.439) 11439

5/08 0:00 -6.68 1.Qxa8 Ne5 2.Nec6+ Kc5 3.Qf8+ Nd6
4.d4+ Kb5 5.Qb8+ Ka4 (27.808) 9269

6/08 0:00 -6.81 1.Qxa8 Ne5 2.d6 c6 3.Nexc6+ Nxc6
4.Nxc6+ Kc5 (48.757) 12189

7/09 0:00 -4.96 1.Qxa8 Ne5 2.d6 Kc5 3.Qd5+ Kb4
4.Qxe5 Kxa5 (56.596) 11319

8/10 0:00 -6.28 1.Qxa8 Nf6 2.Nac6+ Kc5 3.Bxe2 Qxe2
4.d4+ Nxd4 5.Qa7+ Rb6 6.Nxd4 (83.875) 10484

9/14 0:00 -6.25 1.Qxa8 Nf6 2.Nac6+ Kc5 3.Ne5 hxg3
4.N7xg6 Nh5+ 5.Bxh5 Qxh5 6.Qc6+ Kb4 (194.960) 11468

10/18 0:00 -3.01 1.exd7 Qxg3 2.Qxa8 Be8+ 3.Kxh7 Bxd7
4.Bxe2 Rxc2 5.Qd8 Rxd2 6.Qxd7 (470.479) 11475

11/20 0:00 -5.51 1.exd7 Qxg3 2.Qxa8 Be8+ 3.Kxh7 Bxd7
4.Bxe2 Nd6 5.Qh8+ Ke4 6.Nec6 Bxc6
7.Nxc6 Kxd5 (790.428) 11797

12/22 0:00 -6.49 1.exd7 e1Q 2.Nec6+ Kc5 3.Qxa8 Qhxd2
4.d8Q Qc3+ 5.Kg8 Qxf3 6.c4 hxg3
7.cxb5 Qxd5+ 8.Kf8 Qd6+ 9.Qxd6+ cxd6
10.Qa7+ Kxb5 11.Qb7+ Kc5 (1.283.828) 11998

13/30 0:00 -6.20 1.exd7 e1Q 2.Nec6+ Kc5 3.Qxa8 Qhxd2
4.d8Q Qc3+ 5.Kg8 Qxf3 6.c4 Qfxg3
7.Qf8+ Nd6 8.Qa7+ Rb6 9.Qxc7 Be8+
10.Kh8 Rxc6 11.Nxc6 Bxc6 (1.600.059) 12214

14/30 0:00 -6.37 1.exd7 e1Q 2.Nec6+ Kc5 3.Qxa8 Qhxd2
4.d8Q Qc3+ 5.Kg8 Qxf3 6.c4 Qfxg3
7.Qf8+ Nd6 8.Qa7+ Rb6 9.Qxc7 Be8+
10.Kh8 Rxc6 11.Nxc6 Bxc6 12.Qxc6+ Kd4
13.Qb6+ Kxc4 14.Qxa6+ (2.819.842) 12701

15/40 0:00 -7.93 1.exd7 e1Q 2.Nec6+ Kc5 3.Qxa8 Qhxd2
4.d8Q Qc3+ 5.Kg8 Qxf3 6.Qf8+ Nd6
7.Qa7+ Rb6 8.Nb3+ Kxd5 9.Ne7+ Ke4
10.Nxg6 Qfxg3 11.Qaa8+ Ke3 12.Kxh7 Qd1
13.Qh6+ Kf2 14.Qd8 (8.408.164) 13431 TB:2

16/42 0:01 -5.59 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d8Q Qxg3 11.Qf6 Qxf3 12.Na5+ Ka2
13.Qc4+ Kb1 14.Qxh4 (13.469.824) 13469 TB:3

17/42 0:01 -5.02 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qhxd2 6.d8Q a2
7.Nc4+ Kc5 8.Nxd2 a1Q+ 9.Kg8 Rxd2
10.Qxh4 Rd4 11.Nxd4 Nxd4 12.Qf8+ Kb5
13.Qb8+ Ka4 14.Qxc7 (19.258.977) 13318 TB:19

18/52 0:01 -4.76 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 cxd6 11.Bd5+ Kb2 12.Nxd6 Qxg3
13.d8Q Nxd6 14.Qdxd6 (25.502.306) 13091 TB:428

19/52 0:02 -5.39 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 cxd6 11.Bd5+ Kb2 12.Nxd6 Nxd6
13.d8Q Qxg3 14.Qdxd6 (27.757.130) 13013 TB:434

20/52 0:03 -5.83++ 1.Qxa8 (40.127.473) 12853 TB:777

20/52 0:03 -5.46++ 1.Qxa8 (40.608.581) 12858 TB:798

20/52 0:03 -4.98++ 1.Qxa8 (43.578.571) 12904 TB:891

20/52 0:03 -5.39-- 1.Qxa8 e1Q (43.621.626) 12905 TB:892

20/52 0:03 -6.18-- 1.Qxa8 e1Q (45.196.038) 12916
TB:1.037

20/55 0:03 -6.32 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d8Q Qxd4+ 11.Qxd4 Nxd4 12.Qxc7 Nxf3
13.Na5+ Kb2 14.Nc4+ (49.413.343) 12952
TB:1.241

21/55 0:04 -6.27 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 Qc3 11.Bd5+ Kb2 12.d8Q cxd6
13.Nxd6 Qhxg3 14.Nxb5 (61.246.598) 13028
TB:1.455

22/55 0:05 -6.19++ 1.Qxa8 (65.719.071) 13052 TB:1.473

22/55 0:05 -6.27-- 1.Qxa8 e1Q (73.844.101) 13039
TB:1.950

22/55 0:06 -6.37-- 1.Qxa8 e1Q (84.910.892) 13003
TB:2.813

22/55 0:07 -6.41 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 Qc3 11.d8Q cxd6 12.Bd5+ Kb2
13.Nxd6 Qhxg3 14.Qcb6 (92.356.905) 13055
TB:3.133

23/55 0:08 -6.34++ 1.Qxa8 (111.767.297) 13002 TB:4.518

23/55 0:08 -6.41-- 1.Qxa8 e1Q (114.190.361) 13014
TB:4.604

23/58 0:11 -6.34++ 1.Nec6+ (145.011.242) 13098 TB:6.204

23/58 0:11 -6.18++ 1.Nec6+ (149.436.663) 13090 TB:6.230

23/58 0:11 -5.97++ 1.Nec6+ (152.623.724) 13078 TB:6.296

23/58 0:11 -5.69++ 1.Nec6+ (154.301.424) 13074 TB:6.307

23/58 0:12 -5.32++ 1.Nec6+ (160.583.148) 13061 TB:6.650

23/62 0:13 -5.62-- 1.Nec6+ Kc5 (171.483.788) 13036
TB:8.583

23/62 0:13 -5.72 1.Nec6+ Kc5 2.Qxa8 e1Q 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 cxd6 11.Bd5+ Kb2 12.Nxd6 Nxd6
13.d8Q Qxg3 14.Qdxd6 (178.219.135) 13021
TB:9.702

24/62 0:14 -5.79-- 1.Nec6+ Kc5 (191.524.314) 13037
TB:10.755

24/62 0:15 -5.87-- 1.Nec6+ Kc5 (202.324.536) 13051
TB:10.927

24/62 0:15 -5.97-- 1.Nec6+ Kc5 (207.613.945) 13054
TB:11.335

24/62 0:23 -5.88++ 1.Nec6+ (306.783.099) 12828
TB:15.183

24/62 0:26 -5.67++ 1.Nec6+ (342.519.982) 12776
TB:15.933

24/62 0:30 -5.39++ 1.Nec6+ (388.792.279) 12686
TB:17.077

24/62 0:31 -5.02++ 1.Nec6+ (401.262.445) 12662
TB:17.345

24/62 0:36 -5.31-- 1.Nec6+ Kc5 (460.310.877) 12536
TB:20.113

24/62 0:40 -4.19++ 1.Nec6+ (505.079.807) 12528
TB:23.393

24/62 0:44 -5.43-- 1.Nec6+ Kc5 (559.681.670) 12495
TB:28.614

24/62 0:49 -5.88 1.Nec6+ Kc5 2.c3 Qg1 3.Nb4 Qd4+
4.cxd4+ Kxb4 5.exd7 e1Q 6.Nc6+ Kb3
7.Qxa8 a2 8.Qxa6 Kc2 9.Nb4+ Kxd2
10.d8Q a1Q 11.Qxb5 Qe3 12.Qxh4 Qxf3
13.d6 cxd6 14.Qh2+ (625.323.167) 12511
TB:32.180

25/62 1:05 -5.81++ 1.d6 (817.420.737) 12525 TB:34.899

25/62 1:05 -5.73++ 1.d6 (823.159.410) 12525 TB:34.961

25/62 1:06 -5.62++ 1.d6 (827.581.105) 12526 TB:35.010

25/62 1:06 -5.47++ 1.d6 (836.536.188) 12523 TB:35.075

25/62 1:07 -5.26++ 1.d6 (850.837.302) 12517 TB:35.265

25/62 1:12 -4.98++ 1.d6 (899.664.876) 12472 TB:35.526

25/62 1:14 -4.61++ 1.d6 (929.662.462) 12449 TB:35.720

25/62 1:21 -4.12++ 1.d6 (1.010.986.225) 12419 TB:36.767

25/62 1:26 -3.50++ 1.d6 (1.068.540.674) 12386 TB:37.589

25/62 1:41 -2.70++ 1.d6 (1.252.493.694) 12293 TB:44.410

25/62 1:50 -1.68++ 1.d6 (1.356.508.718) 12241 TB:47.069

25/62 2:01 -2.52-- 1.d6 Nb6 (1.483.647.910) 12195
TB:51.370

25/62 2:24 -2.85 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.e7 a2
13.e8Q a1Q 14.Nc4 (1.727.444.726) 11930
TB:84.052

26/62 2:36 -2.92-- 1.d6 Nb6 (1.845.607.185) 11788
TB:110.781

26/62 2:37 -3.00-- 1.d6 Nb6 (1.858.442.326) 11789
TB:112.818

26/62 2:38 -3.10-- 1.d6 Nb6 (1.868.128.726) 11793
TB:113.635

26/62 2:39 -3.26-- 1.d6 Nb6 (1.881.605.118) 11794
TB:114.795

26/62 2:42 -3.47-- 1.d6 Nb6 (1.924.085.727) 11805
TB:122.258

26/62 2:47 -3.75-- 1.d6 Nb6 (1.972.419.588) 11803
TB:125.615

26/62 2:48 -3.52++ 1.d6 (1.989.987.151) 11800
TB:126.385

26/62 2:48 -3.04++ 1.d6 (1.991.752.734) 11800
TB:126.539

26/62 2:49 -2.86 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 a2 11.e8Q Qxd1 12.Bxd1 a1Q
13.Qe5 hxg6 14.Qd4+ (1.998.260.193) 11801
TB:126.757

27/62 2:52 -2.93-- 1.d6 Nb6 (2.029.466.466) 11790
TB:132.008

27/62 2:52 -3.01-- 1.d6 Nb6 (2.034.348.265) 11788
TB:132.867

27/62 2:52 -3.12-- 1.d6 Nb6 (2.038.506.332) 11786
TB:133.753

27/62 2:53 -3.27-- 1.d6 Nb6 (2.043.879.597) 11783
TB:135.180

27/62 2:54 -3.48-- 1.d6 Nb6 (2.058.581.941) 11781
TB:137.737

27/62 2:56 -3.76-- 1.d6 Nb6 (2.074.699.485) 11775
TB:141.846

27/62 3:01 -3.96 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qe1+ Nf1 9.Nxg6 Rxc2
10.Nc6 Qxg3 11.Qxg3+ hxg3 12.e7 a2
13.e8Q a1Q+ 14.Nge5 (2.117.953.503) 11668
TB:159.502

28/62 3:15 -4.04-- 1.d6 Nb6 (2.255.303.763) 11564
TB:199.407

28/62 3:16 -4.11-- 1.d6 Nb6 (2.270.641.420) 11564
TB:202.342

28/62 3:19 -4.22-- 1.d6 Nb6 (2.309.655.840) 11568
TB:208.650

28/62 3:21 -4.37-- 1.d6 Nb6 (2.338.265.158) 11580
TB:210.211

28/62 3:25 -4.25++ 1.d6 (2.381.606.604) 11593
TB:212.797

28/62 3:28 -3.96++ 1.d6 (2.414.527.915) 11593
TB:217.278

28/62 3:30 -3.59++ 1.d6 (2.439.835.280) 11588
TB:221.794

28/62 3:33 -3.89-- 1.d6 Nb6 (2.468.832.904) 11579
TB:228.689

28/62 3:35 -3.98 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.e7 a2
13.e8Q a1Q 14.Nc4 (2.492.465.373) 11580
TB:231.343

29/62 3:51 -4.06-- 1.d6 Nb6 (2.673.865.275) 11541
TB:275.736

29/62 3:52 -4.13-- 1.d6 Nb6 (2.688.111.914) 11545
TB:276.950

29/62 3:56 -4.24-- 1.d6 Nb6 (2.736.774.431) 11552
TB:283.361

29/62 4:02 -4.39-- 1.d6 Nb6 (2.806.831.325) 11570
TB:291.902

29/62 4:05 -4.27++ 1.d6 (2.845.484.556) 11581
TB:293.645

29/62 4:06 -3.98++ 1.d6 (2.850.290.127) 11582
TB:293.866

29/62 4:10 -3.61++ 1.d6 (2.900.535.539) 11598
TB:294.882

29/62 4:11 -3.91-- 1.d6 Nb6 (2.922.811.924) 11605
TB:295.764

29/62 4:17 -4.21 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.e7 a2
13.e8Q a1Q 14.Nc4 (2.995.899.838) 11617
TB:306.778

30/62 4:44 -4.28-- 1.d6 Nb6 (3.227.469.964) 11325
TB:411.123

30/62 5:13 -4.21++ 1.d6 (3.572.473.935) 11391
TB:449.712

30/62 5:19 -4.10++ 1.d6 (3.640.580.010) 11394
TB:456.419

30/62 5:24 -3.95++ 1.d6 (3.695.814.614) 11402
TB:460.771

30/62 5:31 -3.74++ 1.d6 (3.782.717.139) 11413
TB:465.024

30/62 5:38 -3.45++ 1.d6 (3.861.390.220) 11422
TB:470.060

30/62 5:53 -3.08++ 1.d6 (4.042.002.895) 11433
TB:480.175

30/62 6:17 -2.60++ 1.d6 (4.326.398.383) 11458
TB:498.923

30/62 6:54 -1.97++ 1.d6 (4.753.131.688) 11471
TB:532.257

30/62 8:21 -1.18++ 1.d6 (5.743.278.977) 11447
TB:626.365

30/62 10:24 -0.16++ 1.d6 (7.143.236.866) 11437
TB:761.649

30/62 10:53 0.00 1.d6 Nb6 2.dxc7 Kc5 3.c8Q+ Rxc8
4.Nxc8 Rxc2 5.Qe7+ Kd4 6.Qd8+ Kc5
7.Qe7+ (7.483.448.979) 11449
TB:784.420

31/62 11:05 0.00 1.d6 Nb6 2.dxc7 Kc5 3.c8Q+ Rxc8
4.Nxc8 Rxc2 5.Qe7+ Kd4 6.Qd8+ Kc5
7.Qe7+ (7.617.729.658) 11443
TB:791.448

32/62 11:37 0.00 1.d6 Nb6 2.dxc7 Kc5 3.c8Q+ Rxc8
4.Nxc8 Rxc2 5.Qe7+ Kd4 6.Qd8+ Kc5
7.Qe7+ (7.992.145.306) 11453
TB:820.324

33/62 15:00 +0.07++ 1.d6 (10.229.345.602) 11356
TB:1.158.920

33/62 15:49 +0.14++ 1.d6 (10.798.132.819) 11374
TB:1.188.341

33/62 16:44 +0.25++ 1.d6 (11.445.738.546) 11395
TB:1.247.772

33/62 18:01 +0.40++ 1.d6 (12.336.726.072) 11407
TB:1.322.773

33/62 19:08 +0.61++ 1.d6 (13.119.330.393) 11426
TB:1.399.587

33/62 20:37 +0.89++ 1.d6 (14.163.837.390) 11445
TB:1.495.860

33/62 22:05 +1.27++ 1.d6 (15.206.700.421) 11468
TB:1.567.631

33/62 23:55 +1.75++ 1.d6 (16.474.615.054) 11478
TB:1.688.983

33/62 26:37 +2.37++ 1.d6 (18.386.171.215) 11511
TB:1.860.157

33/62 29:28 +3.17++ 1.d6 (20.399.644.851) 11537
TB:2.026.764

33/64 32:18 +4.19++ 1.d6 (22.419.185.356) 11565
TB:2.184.380

33/68 37:39 +5.48++ 1.d6 (26.322.496.999) 11647
TB:2.490.946

33/68 46:41 +6.82 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nd5 Nd6 9.Qe3+ Ne4 10.Nxb6 e1R
11.Nxa8 Rxe3 12.c8Q+ Kf7 13.dxe3 a2
14.Qd7+ (33.256.507.765) 11872
TB:3.097.801

34/69 48:27 +6.89++ 1.d6 (34.660.298.046) 11922
TB:3.228.748

34/69 49:02 +6.97++ 1.d6 (35.127.597.028) 11937
TB:3.253.115

34/69 50:15 +7.08++ 1.d6 (36.089.827.013) 11968
TB:3.300.477

34/69 53:31 +7.23++ 1.d6 (38.689.775.261) 12047
TB:3.444.207

34/78 57:39 +7.44++ 1.d6 (42.033.114.677) 12151
TB:3.681.558

34/78 57:59 +7.29 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nd5 Nd6 9.Qe3+ Ne4 10.Nxb6 e1R
11.Nxa8 Rxe3 12.c8Q+ Kf7 13.dxe3 a2
14.Qd7+ (42.311.921.001) 12159
TB:3.693.869

35/78 60:35 +7.36++ 1.d6 (44.409.827.868) 12215
TB:3.816.448

35/78 62:01 +7.39 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nd5 Nd6 9.Qe3+ Ne4 10.Nxb6 e1R
11.Nxa8 Rxe3 12.c8Q+ Kf7 13.Qc7+ Kf8
14.Qd8+ (45.573.609.072) 12245
TB:3.880.782

36/78 66:28 +7.46++ 1.d6 (49.219.769.437) 12339
TB:4.119.552

36/78 70:10 +7.54++ 1.d6 (52.232.305.818) 12406
TB:4.375.603

36/78 73:50 +7.64++ 1.d6 (55.235.948.741) 12466
TB:4.589.912

36/78 79:17 +7.68 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nd5 Nd6 9.Qe3+ Ne4 10.Nxb6 e1R
11.Nxa8 Rxe3 12.c8Q+ Kf7 13.dxe3 a2
14.Qd7+ (59.703.404.445) 12550
TB:4.979.938

37/78 88:13 +7.76++ 1.d6 (67.055.145.141) 12666
TB:5.562.446

37/78 89:47 +7.83++ 1.d6 (68.315.011.873) 12679
TB:5.630.141

37/78 92:14 +7.94++ 1.d6 (70.279.641.696) 12698
TB:5.729.185

37/78 94:00 +8.09++ 1.d6 (71.698.190.896) 12711
TB:5.925.937

37/78 96:39 +8.30++ 1.d6 (73.859.421.396) 12736
TB:6.036.020

37/78 99:33 +8.58++ 1.d6 (76.272.649.661) 12768
TB:6.138.788

37/78 103:12 +8.95++ 1.d6 (79.306.906.033) 12807
TB:6.305.455

37/78 107:38 +9.44++ 1.d6 (82.994.939.256) 12850
TB:6.511.948

37/78 112:44 +10.06++ 1.d6 (87.319.023.179) 12907
TB:6.808.189

37/78 119:38 +10.86++ 1.d6 (93.266.050.575) 12992
TB:7.340.451

37/78 130:29 +11.88++ 1.d6 (102.910.632.213) 13144
TB:8.471.603

37/78 139:52 +13.17++ 1.d6 (111.397.862.060) 13273
TB:9.552.635

37/78 147:36 +14.80++ 1.d6 (118.484.131.492) 13377
TB:10.055.142

37/78 155:38 +15.82 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nxg6 Rb4+ 9.Qxb4 Nd6 10.Nf4+ Kd7
11.Nxe2 a2 12.Nb3 a1R 13.Nxa1 Nbc8
14.Bxa8 (126.017.027.558) 13494
TB:10.947.203

38/78 158:03 +15.89++ 1.d6 (128.258.063.251) 13523
TB:11.188.505

38/78 159:08 +15.97++ 1.d6 (129.288.320.631) 13539
TB:11.325.532

38/78 160:54 +16.08++ 1.d6 (130.908.182.298) 13559
TB:11.542.321

38/78 162:03 +16.23++ 1.d6 (132.041.153.015) 13579
TB:11.700.643

38/78 164:25 +16.44++ 1.d6 (134.383.454.192) 13622
TB:11.997.688

38/78 167:10 +16.72++ 1.d6 (136.956.182.440) 13654
TB:12.234.644

38/78 174:03 +17.09++ 1.d6 (143.412.254.017) 13732
TB:13.053.418

38/78 175:51 +17.58++ 1.d6 (145.123.989.254) 13754
TB:13.263.293

38/78 177:08 +18.20++ 1.d6 (146.368.331.822) 13771
TB:13.462.885

38/78 178:27 +19.00++ 1.d6 (147.694.774.565) 13793
TB:13.632.898

38/78 186:34 +20.02++ 1.d6 (155.658.966.444) 13905
TB:14.981.264

38/78 188:48 +21.31++ 1.d6 (157.804.212.544) 13930
TB:15.317.706

38/78 194:18 +22.94++ 1.d6 (163.207.430.431) 13998
TB:16.166.506

38/78 198:27 +25.00++ 1.d6 (167.160.888.508) 14038
TB:16.797.888

38/78 198:45 +23.29-- 1.d6 Nb6 (167.447.477.484) 14040
TB:16.858.331

38/78 200:56 +25.44++ 1.d6 (169.554.346.997) 14062
TB:17.139.626

38/78 206:11 +29.54++ 1.d6 (174.766.091.501) 14126
TB:18.015.458

38/78 206:46 +26.09-- 1.d6 Nb6 (175.340.366.249) 14132
TB:18.180.144

38/78 208:47 +30.40++ 1.d6 (177.254.585.582) 14149
TB:18.384.951

38/78 212:23 +38.47++ 1.d6 (180.855.167.773) 14191
TB:18.852.546

38/78 212:30 +31.67-- 1.d6 Nb6 (180.958.598.529) 14192
TB:18.860.104

38/78 213:40 +40.16++ 1.d6 (182.126.059.268) 14206
TB:18.999.815

38/78 213:47 +29.50-- 1.d6 Nb6 (182.245.742.275) 14207
TB:19.032.967

38/78 215:11 +42.79++ 1.d6 (183.564.997.983) 14216
TB:19.157.409

38/84 219:01 +67.56++ 1.d6 (187.230.648.314) 14247
TB:19.820.454

38/84 220:48 +98.54++ 1.d6 (188.919.594.466) 14260
TB:19.972.643

38/84 240:08 +M23 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nxg6 Rb4+ 9.Qxb4 Nd6 10.Nb7 Nbc4
11.Bxe2 hxg6 12.Bxc4+ Nxc4 13.Qxc4+ Kd7
14.Qf7+ (207.183.531.476) 14379
TB:23.108.836

39/84 242:01 +M23 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nxg6 Rb4+ 9.Qxb4 Nd6 10.Nb7 Nbc4
11.Bxe2 hxg6 12.Bxc4+ Nxc4 13.Qxc4+ Kd7
14.Qf7+ (208.887.718.657) 14385
TB:23.303.331

40/84 244:32 +M23 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nxg6 Rb4+ 9.Qxb4 Nd6 10.Nb7 Nbc4
11.Bxe2 hxg6 12.Bxc4+ Nxc4 13.Qxc4+ Kd7
14.Qf7+ (211.337.664.037) 14403
TB:23.729.071

41/84 253:50 +M23 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Qc5+ Kxe6
8.Nxg6 Rb4+ 9.Qxb4 Nd6 10.Nb7 Nbc4
11.Bxe2 hxg6 12.Bxc4+ Nxc4 13.Qxc4+ Kd7
14.Qf7+ (220.223.605.438) 14459
TB:25.900.792
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
User avatar
AdminX
Posts: 6340
Joined: Mon Mar 13, 2006 2:34 pm
Location: Acworth, GA

Re: A hard endgame (?) study

Post by AdminX »

[d]r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - -

Engine: AsmFish [6 Threads] (6144 MB)
by TypingALot


43/84 318:24 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Nxa5 6.Qxc2 Nac4 7.Qc3+ Kc5
8.c8R+ Rxc8 9.d4+ Kd6 10.Nxc8+ Kxe6
11.Nxb6 Nxb6 12.Qc6+ Ke7 13.Qc5+ Kd7
14.Bc6+ (281.123.648.721) 14715
TB:40.843.216
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
Paloma
Posts: 1167
Joined: Thu Dec 25, 2008 9:07 pm
Full name: Herbert L

Re: A hard endgame (?) study

Post by Paloma »

AdminX wrote: 43/84 318:24 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Nxa5 6.Qxc2 Nac4 7.Qc3+ Kc5
8.c8R+ Rxc8 9.d4+ Kd6 10.Nxc8+ Kxe6
11.Nxb6 Nxb6 12.Qc6+ Ke7 13.Qc5+ Kd7
14.Bc6+ (281.123.648.721) 14715
TB:40.843.216
Mate in 22 is korrect, but 5...Nxa5 is suboptimal because 6.Qxc2 is M15

Better is 5...Ke5 and now 6.Nec6+ is M17, so the distance M22 from move one is korrect.