Difficult endgames

[peter]

How long before your engine solve this one

1. Qh6!

No 17931 | G. Amiryan | 3rd honourable mention

[d]5n2/k6p/p1K1p1p1/1pP1P2Q/2p3R1/7b/q1PN3r/8 w - - 0 0

5n2/k6p/p1K1p1p1/1pP1P2Q/2p3R1/7b/q1PN3r/8 w - - 0 1

Analysis by Stockfish MateFinder 64:

1.Dg5 Txd2 2.Dxd2 Lxg4 3.Dd8 Lf3+ 4.Kd6 Dxc2
-+ (-8.39) Tiefe: 7/8 00:00:00 19kN
...
1.Dg5
-+ (-6.13 ++) Tiefe: 36/71 00:01:33 1840MN
1.Dh6
-+ (-5.98 ++) Tiefe: 36/71 00:01:41 2008MN
...
1.Dh6 Lg2+ 2.Txg2 Txh6 3.Tf2 Sd7 4.Tf7 Kb8 5.Txd7 Da5 6.Sb3 cxb3 7.cxb3 Th1 8.b4 Dxb4 9.Td8+ Ka7 10.Td7+ Ka8 11.Td8+ Ka7
= (0.00) Tiefe: 36/71 00:02:55 3578MN
...
1.Dh6 Lg2+ 2.Txg2 Txh6 3.Tf2 Sd7 4.Tf7 Kb8 5.Txd7 Da5 6.Sb3 cxb3 7.cxb3 Th1 8.b4 Dxb4 9.Td8+ Ka7 10.Td7+ Ka8 11.Td8+ Ka7
= (0.00) Tiefe: 46/71 00:05:17 6677MN

Time to Eval about 3 minutes

[Nordlandia]

M. Pagani | Author claims draw

[d]8/2p1p2p/p6p/p1k1PPK1/P3p3/8/3N2P1/6n1 w - - 0 0

[peter]

The question is if this one is correct.

Why not

[peter]

[d]8/4k3/3R2KB/P5P1/8/P7/2pp4/1b3R2 w - - 0 1

Analysis by Stockfish MateFinder 64:

1.Rb6 d1Q 2.Rf7+ Ke8 3.Rb8+ Qd8 4.Rf8+ Ke7 5.Rb7+ Qd7 6.Rf7+ Ke6 7.Rfxd7 c1Q+ 8.Kg7 Qc3+ 9.Kg8 Qc8+ 10.Bf8 Qxd7 11.Rxd7 Kxd7 12.a6 Kc6 13.a7 Kb7 14.Bc5 Bc2 15.Kf7 Bb3+ 16.Ke7 Bc2 17.Kf6 Ka8 18.Bd4 Kb7 19.Ke5 Ka8 20.Kd6 Be4 21.a4 Bc2 22.a5 Be4 23.Ke7 Bc2 24.Kf7 Bb3+ 25.Kf6 Bc2 26.Be3 Kb7 27.Bc5 Bd3 28.Kf7 Bc2 29.Bd4 Bb3+ 30.Kf8 Bc2 31.Kg7 Ka8 32.Kg8 Be4 33.Kf7 Kb7 34.Be3 Bc2 35.Bc5 Ka8 36.Kg7 Bb3 37.Be3 Bc2 38.Bd4 Bb3 39.Bc5 Bc2 40.Kg8 Bb3+ 41.Kh7 Kb7
+- (2.57) Depth: 50/82 00:04:48 6060MN, tb=149412197

In Output after Forward- Backward there's a drawn 7some- position reached at move 11. Yet the blunder might be 7.Rfxd7, (line in your .jpg given with ? too) after author's Rb6+ ff up to 15.Qxa3 that's a full point- Losomosov then:

8/4k3/3R2KB/P5P1/8/P7/2pp4/1b3R2 w - - 0 1

1. Rb6 d1=Q 2. Rf7+ Ke8 3. Rb8+ Qd8 4. Rf8+ Ke7 5. Rb7+ Qd7 6. Rf7+ Ke6 7. Rb6+
Qd6 8. Rf6+ Ke5 9. Rb5+ Qd5 10. Rf5+ Ke6 11. Rbxd5 c1=Q 12. Rde5+ Kd7 13. Kg7
Bxf5 14. Rxf5 Qc3+ 15. Kg8 Qxa3 *

[d]6K1/3k4/7B/P4RP1/8/q7/8/8 w - - 0 16

[peter]

8/4k3/3R2KB/P5P1/8/P7/2pp4/1b3R2 w - - 0 1

1. Rb6 d1=Q 2. Rf7+ Ke8 3. Rb8+ Qd8 4. Rf8+ Ke7 5. Rb7+ Qd7 6. Rf7+ Ke6 7. Rb6+
Qd6 8. Rf6+ Ke5 9. Rb5+ Qd5 10. Rf5+ Ke6 11. Rbxd5 c1=Q 12. Rde5+ Kd7 13. Kg7
Bxf5 14. Rxf5 Qc3+ 15. Kg8 Qxa3 *

[d]6K1/3k4/7B/P4RP1/8/q7/8/8 w - - 0 16

Question remains, if Black can try to to reach 50 moves boundary keeping on to threat with own stalemate and perpetual check , so instead of 15...Qxa3 e.g. ...Qc4+. Have fun trying!

[Nordlandia]

TC: 45m+30s
Hash: 2048 Mb
Ponder: off

[pgn][Event "i5-5200U, Slow 45m+30s"]
[Site "DESKTOP-DD1B2QU"]
[Date "2017.03.06"]
[Round "1"]
[White "Houdini 5.01 Pro x64-pext"]
[Black "Stockfish 060317 64 POPCNT"]
[Result "1/2-1/2"]
[Annotator "-1.47;-1.09"]
[SetUp "1"]
[FEN "6k1/pp3p2/6p1/3p4/2pN4/P1P2P1P/1P1qR1P1/6K1 b - - 0 1"]
[PlyCount "136"]
[TimeControl "2700+30"]

1... Qc1+ {-1.09/34 36 Both last book move} 2. Kh2 {-1.47/32 482} g5 {-1.09/41
54 (Qf1)} 3. g3 {-1.12/32 37 (Kg3)} Kh7 {-1.26/33 44} 4. Kg2 {-1.12/32 14 (Rg2)
} Kg6 {-1.18/51 200} 5. Rc2 {-1.12/34 72 (Rf2)} Qb1 {-1.18/47 55} 6. Rf2 {
-1.30/33 139 (Re2)} a6 {-1.33/45 269} 7. Rd2 {-1.37/33 90} b5 {-1.47/43 215} 8.
Re2 {-1.37/34 65} Kh7 {-1.47/42 78} 9. h4 {-1.30/29 46 (Rf2)} gxh4 {-1.60/34 59
} 10. gxh4 {-1.37/31 138} Kg6 {-1.59/41 117} 11. Kg3 {-1.45/31 96} Qc1 {
-1.54/35 16} 12. Kg4 {-1.45/30 65} Qg1+ {-1.68/37 40} 13. Kh3 {-1.45/29 12}
Qf1+ {-1.68/36 39 (Kh5)} 14. Kg3 {-1.33/25 43} a5 {-1.77/38 70} 15. Rf2 {
-1.47/30 146} Qh1 {-1.77/39 11} 16. Nxb5 {-1.47/30 23} Kh5 {-1.77/47 57} 17.
Rh2 {-1.47/35 67} Qe1+ {-1.77/47 24} 18. Rf2 {-1.47/34 2} Qe5+ {-1.77/52 86}
19. Kg2 {-1.47/36 76 (Kh3)} Kxh4 {-1.77/50 71} 20. Nd4 {-1.47/36 28} Qg3+ {
-1.77/50 21} 21. Kf1 {-1.47/36 0} Qf4 {-1.77/54 86} 22. Kg2 {-1.47/36 89 (Ne2)}
Kg5 {-1.77/52 67} 23. Kf1 {-1.47/35 14 (Re2)} Qc1+ {-1.77/54 84} 24. Kg2 {
-1.47/34 0} Qe3 {-1.77/55 30} 25. Re2 {-1.46/37 129} Qf4 {-1.77/54 68} 26. Kg1
{-1.46/36 16 (Rf2)} Qf6 {-1.77/55 71} 27. Rg2+ {-1.46/37 109 (Rh2)} Kf4 {
-1.77/53 73} 28. Ne2+ {-1.47/37 104 (Kf1)} Ke3 {-1.77/53 67} 29. Nd4 {-1.47/36
4} Kd3 {-1.77/54 14 (Qd8)} 30. Kf1 {-1.47/39 82} Qf4 {-1.77/55 77 (Qb6)} 31.
Rf2 {-1.47/37 96 (Kf2)} Qc1+ {-1.77/54 70 (Qg5)} 32. Kg2 {-1.47/1 0} a4 {
-1.77/54 75} 33. Nc6 {-1.40/36 63 (Kg3)} Qg5+ {-1.77/55 69} 34. Kf1 {-1.40/36 0
} Qh5 {-1.77/57 37} 35. Nb4+ {-1.40/37 87} Ke3 {-1.77/1 0} 36. Nc2+ {-1.40/36
22} Kf4 {-1.77/60 71} 37. Kg1 {-1.40/39 117} Qe5 {-1.77/58 78 (Qg6+)} 38. Nd4 {
-1.40/41 108} Qg7+ {-1.77/59 87 (Qe1+)} 39. Rg2 {-1.40/41 107} Qh7 {-1.77/59 35
} 40. Rf2 {-1.34/34 13 (Re2)} Qb1+ {-1.77/60 82 (Qh3)} 41. Kg2 {-1.23/32 52}
Qd3 {-1.77/59 14 (Qe1)} 42. Re2 {-1.23/36 94 (Kg1)} Qg6+ {-1.77/62 103 (Qd1)}
43. Kf1 {-1.23/38 70} Qg3 {-1.77/54 63 (Qb1+)} 44. Rf2 {-1.23/39 79 (Re7)} Qh3+
{-1.77/58 63} 45. Kg1 {-1.23/40 19 (Rg2)} Qh6 {-1.77/56 59 (Qc8)} 46. Re2 {
-1.23/41 90 (Rg2)} Qd6 {-1.77/58 70 (Qh4)} 47. Kf2 {-0.10/32 86} Qb6 {-1.77/58
24} 48. Ke1 {-0.19/33 77} Qg6 {-1.77/60 68 (Kg5)} 49. Kf1 {-0.01/72 41 (Kf2)}
Qh5 {-1.77/57 83} 50. Kg1 {-1.23/40 142 (Rg2)} Qg5+ {-1.77/58 57 (f6)} 51. Kf1
{-1.23/41 63 (Kh1)} Qg6 {-1.77/61 63} 52. Rf2 {-1.23/41 26} Qb1+ {-1.77/61 99
(Qd3+)} 53. Kg2 {-0.01/85 0} Qh7 {-1.77/52 72} 54. Kg1 {-0.01/85 37} Qg7+ {
-1.77/55 59} 55. Rg2 {-0.01/85 11 (Kf1)} Qf6 {-1.77/56 105} 56. Rf2 {-1.23/40
123 (Kf1)} Qh6 {-1.77/60 54 (Qh8)} 57. Re2 {-0.01/72 35} Qb6 {-1.72/53 130} 58.
Kf1 {-0.08/32 60 (Rf2)} Qg6 {-1.72/47 111} 59. Rf2 {-0.01/75 45} Qh6 {-1.77/46
73} 60. Kg1 {-1.23/41 104 (Rg2)} Qh8 {-1.71/44 77 (f6)} 61. Rh2 {-1.23/39 57
(Re2)} Qg8+ {-1.77/44 39} 62. Kf1 {-1.23/41 55 (Rg2)} Qg5 {-1.77/41 81 (f6)}
63. Re2 {-0.01/56 40 (Rg2)} Qg7 {-1.19/41 79} 64. Rh2 {-1.23/41 109 (Rg2)} Qe5
{-1.13/48 42} 65. Rg2 {-1.23/39 43 (Rh7)} Qe8 {-1.13/47 28 (Qe3)} 66. Re2 {
-1.23/39 49 (Rh2)} Qh8 {-1.13/51 41} 67. Kg1 {-1.23/39 40 (Kf2)} Qh3 {-1.13/53
30 (f6)} 68. Rf2 {-0.01/72 29 (Kf2)} Qh7 {-1.47/50 21} 69. Re2 {-1.23/42 153
(Rc2) adjud. Draw accepted} 1/2-1/2

[/pgn]

[peter]

But that's about Goldin- Korzubov again now, the one we were talking about latest was Hornecker- Minski, Jon.
Your threads are already getting a little confusing to me again.

[Nordlandia]

But that's about Goldin- Korzubov again now, the one we were talking about latest was Hornecker- Minski, Jon.
Your threads are already getting a little confusing to me again.

Regarding Goldin- Korzubov position, i think it is draw unless someone with powerful hardware test is.

Siegfred Hornecker position:

It looks like white wins, - 7-man position is easily winning according lomonosov tablebases.

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

Found another possible cook

Winning 8-man EGTB position.

No 18647 | P. Krug | 4th price | Draw

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "6rk/8/b6P/2P3P1/n7/2bp3p/3N4/1QN2K2 w - - 0 0"]
[PlyCount "18"]

1. Kg1 Rxg5+ 2. Kh1 Nb2 3. c6 Bb5 4. Kh2 Be5+ 5. Kxh3 Rg6 6. Nxd3 Bxd3 7. c7
Rg8 8. h7 Kxh7 9. c8=Q Rxc8 *

[/pgn]

[d]6rk/8/b6P/2P3P1/n7/2bp3p/3N4/1QN2K2 w - - 0 0

[d]2r5/7k/8/4b3/8/3b3K/1n1N4/1Q6 w - - 0 9

[peter]

Regarding Goldin- Korzubov position, i think it is draw unless someone with powerful hardware test is.

I tested it with powerful hardware and do think too it is drawn.

Just thought we had already agreed about that

[Nordlandia]

Regarding Goldin- Korzubov position, i think it is draw unless someone with powerful hardware test is.

I tested it with powerful hardware and do think too it is drawn.

Just thought we had already agreed about that

Then we agree for now. Surely i will test that position in the future as the engines and hardware advances.

Cook detected

No 18170 | S. Osintsev | First price | Moscow Town 2009 | 4/5 Draw
[d]5B1r/1nk1KR2/8/6P1/8/8/n7/b7 w - - 0 0



[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "5B1r/1nk1KR2/8/6P1/8/8/n7/b7 w - - 0 0"]
[PlyCount "202"]

{[#]} 1. g6 Rg8 (1... Nd8 $11) 2. Rf1 (2. Ke8+) 2... Rxg6 3. Rxa1 {Lomonosov
Tablebases} Nc3 4. Rc1 Rg3 5. Bh6 Kb6 6. Bd2 Nb5 7. Kf6 Rb3 8. Ke5 Na7 9. Rc3
Nc6+ 10. Ke6 Rb2 11. Bc1 Ra2 12. Be3+ Kb5 13. Kd7 Rg2 14. Rb3+ Nb4 15. Rb1 Re2
16. Bd4 Kc4 17. Bb6 Rh2 18. Rc1+ Kb5 19. Bd4 Rh3 20. Bg1 Rh7+ 21. Ke6 Nd3 22.
Rb1+ Kc6 23. Rb6+ Kc7 24. Rb1 Rh5 25. Ra1 Nd8+ 26. Kf6 Nc6 27. Rd1 Ncb4 28. Rd2
Kc6 29. Bh2 Ra5 30. Re2 Nd5+ 31. Kg7 Nc5 32. Bg1 Nb7 33. Bh2 Ra1 34. Rg2 Rh1
35. Bb8 Rf1 36. Kh6 Nd8 37. Re2 Kb5 38. Kg5 Kc4 39. Bg3 Rf6 40. Be5 Ne6+ 41.
Kg4 Rf1 42. Bb2 Nec7 43. Rc2+ Kd3 44. Rc1 Ne3+ 45. Kh5 Rf5+ 46. Kg6 Ncd5 47.
Ra1 Nf4+ 48. Kg7 Nc4 49. Rd1+ Ke2 50. Rc1 Nd6 51. Rc6 Ne4 52. Bc1 Nd3 53. Ba3
Kf3 54. Ra6 Ne5 55. Bb2 Nc4 56. Ba3 Rb5 57. Kf7 Ke3 58. Be7 Kd4 59. Ke6 Re5+
60. Kd7 Rh5 61. Ra1 Rh7 62. Rd1+ Ke5 63. Kd8 Ne3 64. Ra1 Nd5 65. Ra5 Kd4 66.
Ba3 Ng5 67. Kc8 Ne6 68. Rb5 Ke5 69. Ra5 Rh8+ 70. Kb7 Nd8+ 71. Ka6 Rh2 72. Kb5
Rc2 73. Ka4 Ne6 74. Rb5 Rc8 75. Bb2+ Ke4 76. Kb3 Nc5+ 77. Kc2 Nb7+ 78. Kb1 Nd6
79. Rb3 Nc4 80. Bc1 Rg8 81. Kc2 Rg2+ 82. Kd1 Rh2 83. Bg5 Ne5 84. Bd2 Kd4 85.
Rb8 Nf3 86. Ba5 Ne3+ 87. Kc1 Rh1+ 88. Kb2 Nc4+ 89. Kc2 Na3+ 90. Kb2 Rb1+ 91.
Kxa3 Rxb8 92. Bc7 Rb7 93. Bd6 Kc4 94. Bf4 Ne1 95. Bh2 Nd3 96. Bg1 Re7 97. Bf2
Nxf2 98. Kb2 Re2+ 99. Kb1 Nd3 100. Ka1 Kb3 101. Kb1 Re1# {Lomonosov Tablebases}
*

[/pgn]