A very subtle fortress destruction

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

A very subtle fortress destruction

Post by Arpad Rusz »

In this endgame study by Vladislav Tarasiuk (Problemist of Ukraine, 2014) white has to very carefully choose between 1.d6 and 1.g6. One of the moves will lead to an indestructible fortress, the other one is winning. Guess, which move is played by the engines? :roll: :wink:

[d]8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1
White wins
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peter
Posts: 3575
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: A very subtle fortress destruction

Post by peter »

Arpad Rusz wrote: white has to very carefully choose between 1.d6 and 1.g6. One of the moves will lead to an indestructible fortress, the other one is winning. Guess, which move is played by the engines? :roll: :wink:

[d]8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1
White wins
Very well, Arpad!
Yet komodo with full Syzygys realizes its error being shown the right move with soon climbing evals, whereas there is no progress with the wrong one chosen first.
At least teachable.
:)
Peter.
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h1a8
Posts: 518
Joined: Fri Jun 04, 2010 7:23 am

Re: A very subtle fortress destruction

Post by h1a8 »

Arpad Rusz wrote:In this endgame study by Vladislav Tarasiuk (Problemist of Ukraine, 2014) white has to very carefully choose between 1.d6 and 1.g6. One of the moves will lead to an indestructible fortress, the other one is winning. Guess, which move is played by the engines? :roll: :wink:

[d]8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1
White wins
can you pm me the solution. I don't see it.
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User avatar
Nordlandia
Posts: 2838
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: A very subtle fortress destruction

Post by Nordlandia »

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1"]
[PlyCount "22"]

1. d6 (1. g6 hxg6 2. d6 g3+ 3. Kh1 Bh4 4. d8=Q Bxd8 5. Nxd8 b4 6. axb4 cxb4 7.
Nxe6 b3 8. Nc5 b2 9. Na4+ Kc2 10. Nxb2 Kxb2 11. d7 Ne2 12. d8=Q Kc2 13. Qd5 g5
14. Qd8 g4 15. Qd5 a5 16. Qxa5 Kd3 17. Qg5 Ke4 18. Qd2 Nd4 19. Qb4 Kd5 20. Qb7+
Kc4 21. Qc7+ Kb3 22. Qxg3+) 1... Bxg5 2. d8=Q g3+ 3. Kh1 Bxd8 4. Nxd8 b4 5.
axb4 cxb4 6. Nxe6 b3 7. Nc5 b2 8. Na4+ Kc2 9. Nxb2 Kxb2 10. d7 Ne2 11. d8=Q Kc2
*
[/pgn]

[d]3Q4/7p/p7/8/8/6p1/2k1n1P1/7K w - - 0 12

Analysis by Stockfish 200116 64 BMI2:

12.Qa5 Kd1 13.Qxa6 Kd2 14.Qa5+

+- (6.02) Depth: 56/74 00:00:00 27434kN, tb=213
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Arpad Rusz
Posts: 273
Joined: Sat Apr 17, 2010 2:34 pm
Location: Budapest

Re: A very subtle fortress destruction

Post by Arpad Rusz »

Here is the author's solution:

[pgn][Event "Problemist of Ukraine"]
[Site "?"]
[Date "2014.??.??"]
[Round "?"]
[White "Tarasiuk, Vladislav"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 0"]
[PlyCount "33"]
[EventDate "2014.??.??"]

1. g6 $1 (1. d6 $2 g3+ 2. Kh1 Bxg5 3. d8=Q Bxd8 4. Nxd8 b4 5. axb4 cxb4 6. Nxe6 b3 7. Nc5 b2 8. Na4+ Kc2 9. Nxb2 Kxb2 10. d7 Ne2 11. d8=Q Kc2 12. Qd5 h6 $1 13.Qd8 a5 14. Qxa5 Kd3 $11) 1... hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8 g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3 8. Nc5 b2 9. Na4+ Kc2 10. Nxb2 Kxb2 11. d7 Ne2 12. d8=Q Kc2 13. Qd5 g5 14. Qd8 g4 15. Qd5 a5 16. Qxa5 Kd3 17. Qg5 1-0[/pgn]
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: A very subtle fortress destruction

Post by zullil »

Arpad Rusz wrote:Here is the author's solution:

[pgn][Event "Problemist of Ukraine"]
[Site "?"]
[Date "2014.??.??"]
[Round "?"]
[White "Tarasiuk, Vladislav"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 0"]
[PlyCount "33"]
[EventDate "2014.??.??"]

1. g6 $1 (1. d6 $2 g3+ 2. Kh1 Bxg5 3. d8=Q Bxd8 4. Nxd8 b4 5. axb4 cxb4 6. Nxe6 b3 7. Nc5 b2 8. Na4+ Kc2 9. Nxb2 Kxb2 10. d7 Ne2 11. d8=Q Kc2 12. Qd5 h6 $1 13.Qd8 a5 14. Qxa5 Kd3 $11) 1... hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8 g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3 8. Nc5 b2 9. Na4+ Kc2 10. Nxb2 Kxb2 11. d7 Ne2 12. d8=Q Kc2 13. Qd5 g5 14. Qd8 g4 15. Qd5 a5 16. Qxa5 Kd3 17. Qg5 1-0[/pgn]
The latest Stockfish (without endgame tables) switched to g6 very early in the search. It seems to be converging to a win, albeit after a long search ...

Code: Select all

info depth 64 seldepth 110 multipv 1 score cp 740 nodes 359744679369 nps 55658418 hashfull 999 tbhits 0 time 6463437 pv g5g6 h7g6 d5d6 e7g5 d7d8q g5d8 b7d8 g4g3 h2h1 b5b4 a3b4 c5b4 d8e6 b4b3 e6c5 c3c4 c5b3 c4b3 d6d7 c1e2 d7d8q b3c2 d8c7 c2d2 c7a5 d2d1 a5a6 d1e1 a6g6 e1d2 g6g5 d2e1 g5e7 e1f2 e7c5 f2e1 c5d6 e1f2 d6b6 f2e1 b6a5 e1f2 a5d2 f2f1 d2d3 f1f2 d3f5 f2e1 f5e4 e1d2 e4a4 d2e3 a4a3 e3f2 a3f3 f2e1 f3f5 e1d2 f5d5 d2e3 d5f3 e3d2 f3f6 d2e3 f6e6 e3f2 e6e5 f2e1 e5e8 e1d2 e8g8 d2e3 g8d5 e3f2 d5b3 f2e1 b3b6 e1d2 b6a5 d2e3 a5g5 e3f2 g5g4 f2e1 g4b4 e1f1 b4f8 f1e1 f8f6 e1d2 f6b2 d2e3 b2b5 e3d2 b5b4 d2d3 b4a3 d3d2 a3d6 d2e3 d6h6 e3f2 h6g6 f2e3 g6a6 e3d2 a6a2 d2e3 a2a7 e3d2
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 747 lowerbound nodes 835208970832 nps 55478921 hashfull 999 tbhits 0 time 15054528 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 754 lowerbound nodes 1171812468229 nps 55398778 hashfull 999 tbhits 0 time 21152316 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 764 lowerbound nodes 1456571193776 nps 55398644 hashfull 999 tbhits 0 time 26292542 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 779 lowerbound nodes 1725838360051 nps 55371612 hashfull 999 tbhits 0 time 31168288 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 799 lowerbound nodes 2014767681792 nps 55316804 hashfull 999 tbhits 0 time 36422344 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
info depth 65 seldepth 110 multipv 1 score cp 826 lowerbound nodes 2382751802978 nps 55527998 hashfull 999 tbhits 0 time 42910817 pv g5g6
info depth 65 currmove g5g6 currmovenumber 1
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: A very subtle fortress destruction

Post by bob »

Arpad Rusz wrote:In this endgame study by Vladislav Tarasiuk (Problemist of Ukraine, 2014) white has to very carefully choose between 1.d6 and 1.g6. One of the moves will lead to an indestructible fortress, the other one is winning. Guess, which move is played by the engines? :roll: :wink:

[d]8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1
White wins
Crafty switches from d6 to g6 at depth=25, at the 4 second mark. Score jumps from about +1.75, to +5.0 at that point:

Code: Select all

         24->   1.04          0.72   1. d6 Bxg5 2. d8=Q Bxd8 3. Nxd8 g3+ 4. Kh3
                                     Nd3 5. Nxe6 Ne5 6. Nxc5 a5 7. Kxg3 Nc6
                                     8. d7 b4 9. axb4 axb4 10. Kf4 b3 11. Kf5
                                     Kc4 12. Nxb3 Kxb3
         25     1.31          0.77   1. d6 Bxg5 2. d8=Q Bxd8 3. Nxd8 g3+ 4. Kh3
                                     Nd3 5. Nxe6 Ne5 6. Nxc5 a5 7. Kxg3 Nc6
                                     8. d7 b4 9. axb4 axb4 10. Kf4 b3 11. Kf5
                                     Kc4 12. Nxb3 Kxb3 13. Kf6
         25     4.06          1.16   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qa3 12. Nc5 Qxd3 13. Nxd3+ Kc3
                                     14. Ne5
         25->   4.06          1.16   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qa3 12. Nc5 Qxd3 13. Nxd3+ Kc3
                                     14. Ne5 (s=2)
         26     5.03          1.72   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qb8+ 13. Kf2 Qf4+
                                     14. Ke2 Qg4+ 15. Kf1 Qc4 16. Qxc4+ Kxc4
                                     17. Nd2+ Kc3 (s=2)
         26->   5.50          1.72   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qb8+ 13. Kf2 Qf4+
                                     14. Ke2 Qg4+ 15. Kf1 Qc4 16. Qxc4+ Kxc4
                                     17. Nd2+ Kc3 (s=2)
         27     6.15          1.74   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qe5+ 13. Kf2 Qf6+
                                     14. Kg1 Qc3 15. Qxc3+ Kxc3 16. Nc5 a5
                                     (s=2)
         27->   6.67          1.74   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qe5+ 13. Kf2 Qf6+
                                     14. Kg1 Qc3 15. Qxc3+ Kxc3 16. Nc5 a5
                                     (s=2)
         28    11.88          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc2
                                     14. Qc5+ Kd1 <HT> (s=2)
         28->  12.71          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc2
                                     14. Qc5+ Kd1 <HT>
         29    17.04          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 <HT>
         29->  17.89          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 <HT>
         30    20.50          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd3+ Kc1 19. Qc3+ Kb1
                                     20. Qxg3
         30->  58.33          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd3+ Kc1 19. Qc3+ Kb1
                                     20. Qxg3
         31     1:06          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd5+ Kc1 19. Qc6+ Kd2
                                     20. Qxg6
         31->   1:19          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd5+ Kc1 19. Qc6+ Kd2
                                     20. Qxg6
         32     1:29          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qf4+ Kc2 15. Qa4+ Kc1 <HT>
... <snip>
        time=8:22(99%)  nodes=56523498877(56.5B)  fh1=78%  pred=0  nps=112.5M
        chk=2.8B  qchk=5.6B  fp=11.4B  mcp=1.5B  50move=0
        LMReductions:  1/552.7M  2/208.1M  3/86.2M  4/16.3M  5/267.6K  6/352
        null-move (R):  3/561.4M  4/25.2M  5/347.3K  6/17.1K  7/1.2K  8/17
        splits=1.9M(713.7K)  aborts=376.0K  joins=6.0M  data=46%(46%)
White(1): g6
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: A very subtle fortress destruction

Post by bob »

bob wrote:
Arpad Rusz wrote:In this endgame study by Vladislav Tarasiuk (Problemist of Ukraine, 2014) white has to very carefully choose between 1.d6 and 1.g6. One of the moves will lead to an indestructible fortress, the other one is winning. Guess, which move is played by the engines? :roll: :wink:

[d]8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - - 0 1
White wins
Crafty switches from d6 to g6 at depth=25, at the 4 second mark. Score jumps from about +1.75, to +5.0 at that point:

Code: Select all

         24->   1.04          0.72   1. d6 Bxg5 2. d8=Q Bxd8 3. Nxd8 g3+ 4. Kh3
                                     Nd3 5. Nxe6 Ne5 6. Nxc5 a5 7. Kxg3 Nc6
                                     8. d7 b4 9. axb4 axb4 10. Kf4 b3 11. Kf5
                                     Kc4 12. Nxb3 Kxb3
         25     1.31          0.77   1. d6 Bxg5 2. d8=Q Bxd8 3. Nxd8 g3+ 4. Kh3
                                     Nd3 5. Nxe6 Ne5 6. Nxc5 a5 7. Kxg3 Nc6
                                     8. d7 b4 9. axb4 axb4 10. Kf4 b3 11. Kf5
                                     Kc4 12. Nxb3 Kxb3 13. Kf6
         25     4.06          1.16   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qa3 12. Nc5 Qxd3 13. Nxd3+ Kc3
                                     14. Ne5
         25->   4.06          1.16   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qa3 12. Nc5 Qxd3 13. Nxd3+ Kc3
                                     14. Ne5 (s=2)
         26     5.03          1.72   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qb8+ 13. Kf2 Qf4+
                                     14. Ke2 Qg4+ 15. Kf1 Qc4 16. Qxc4+ Kxc4
                                     17. Nd2+ Kc3 (s=2)
         26->   5.50          1.72   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qb8+ 13. Kf2 Qf4+
                                     14. Ke2 Qg4+ 15. Kf1 Qc4 16. Qxc4+ Kxc4
                                     17. Nd2+ Kc3 (s=2)
         27     6.15          1.74   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qe5+ 13. Kf2 Qf6+
                                     14. Kg1 Qc3 15. Qxc3+ Kxc3 16. Nc5 a5
                                     (s=2)
         27->   6.67          1.74   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh3 b4 6. Nxe6 bxa3 7. d7 a2
                                     8. d8=Q Nb3 9. Nxc5 a1=Q 10. Qd3+ Kb4
                                     11. Nxb3 Qh8+ 12. Kxg3 Qe5+ 13. Kf2 Qf6+
                                     14. Kg1 Qc3 15. Qxc3+ Kxc3 16. Nc5 a5
                                     (s=2)
         28    11.88          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc2
                                     14. Qc5+ Kd1 <HT> (s=2)
         28->  12.71          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc2
                                     14. Qc5+ Kd1 <HT>
         29    17.04          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 <HT>
         29->  17.89          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 <HT>
         30    20.50          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd3+ Kc1 19. Qc3+ Kb1
                                     20. Qxg3
         30->  58.33          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd3+ Kc1 19. Qc3+ Kb1
                                     20. Qxg3
         31     1:06          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd5+ Kc1 19. Qc6+ Kd2
                                     20. Qxg6
         31->   1:19          4.94   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qc5+ Kd1 15. Qd4+ Kc2 16. Qe4+ Kc1
                                     17. Qc4+ Kd1 18. Qd5+ Kc1 19. Qc6+ Kd2
                                     20. Qxg6
         32     1:29          4.83   1. g6 hxg6 2. d6 Bg5 3. d8=Q Bxd8 4. Nxd8
                                     g3+ 5. Kh1 b4 6. axb4 cxb4 7. Nxe6 b3
                                     8. Nc5 Nd3 9. Nxd3 Kxd3 10. d7 Kc2
                                     11. d8=Q b2 12. Qc7+ Kd1 13. Qd6+ Kc1
                                     14. Qf4+ Kc2 15. Qa4+ Kc1 <HT>
... <snip>
        time=8:22(99%)  nodes=56523498877(56.5B)  fh1=78%  pred=0  nps=112.5M
        chk=2.8B  qchk=5.6B  fp=11.4B  mcp=1.5B  50move=0
        LMReductions:  1/552.7M  2/208.1M  3/86.2M  4/16.3M  5/267.6K  6/352
        null-move (R):  3/561.4M  4/25.2M  5/347.3K  6/17.1K  7/1.2K  8/17
        splits=1.9M(713.7K)  aborts=376.0K  joins=6.0M  data=46%(46%)
White(1): g6
Sorry, this was botched. terminating backslash-code was missing. Actually it was botched in many ways. I was running hash tests yesterday and had set .craftyrc hash size, path hash size, etc to tiny values, and forgot about it. It reaches depth=36 in 3 minutes. Not going to post again with more analysis.
Last edited by bob on Sun Jan 24, 2016 6:26 pm, edited 1 time in total.
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: A very subtle fortress destruction

Post by kgburcham »

[d] 8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - -


Engine: Komodo 9.3 64-bit (8192 MB)
by Don Dailey, Larry Kaufman, Mark Lefler
Threads now set to 8

21 0:05 +3.93 1.g6 hxg6 2.d6 Bg5 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 g3+ 6.Kh1 Nd3 7.Nc6 cxb4 8.d7 b3 9.d8Q b2 10.Qa5+ Kb3 11.Qb6+ Kc3 12.Kg1 e5 13.Na5 e4 14.Qb3+ (120.500.355) 20899
21 0:05 +3.83 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Kc4 8.Nxb3 Nxb3 9.d7 a5 10.d8Q a4 11.Qc7+ Kb4 12.Qf4+ Kb5 13.Qxg3 Nc5 14.Kg1 (120.501.394) 20899
-----
<snip>

46 31:27 +5.04 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Ne2 8.Nxb3 Kxb3 9.d7 Kc2 10.d8Q h6 11.Qb6 Kd3 12.Qxa6+ Ke3 13.Qxh6+ Kf2 14.Qb6+ (44.873.866.509) 23772
46 31:27 +5.04 1.g6 hxg6 2.d6 Bf6 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 cxb4 6.Nxe6 b3 7.Nc5 b2 8.Na4+ Kc2 9.Nxb2 g3+ 10.Kh1 Kxb2 11.d7 Ne2 12.d8Q Kc2 13.Qg5 Kd3 14.Qxg6+ (44.873.870.179) 23772
-----
47 42:50 +5.04 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Kc4 8.Nxb3 Kxb3 9.d7 Ne2 10.d8Q Kc2 11.Qc8+ Kd1 12.Qxa6 Ke1 13.Qa5+ Kf2 14.Qa7+ (61.393.282.998) 23880
47 42:50 +5.04 1.g6 hxg6 2.d6 Bf6 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 cxb4 6.Nxe6 b3 7.Nc5 b2 8.Na4+ Kc2 9.Nxb2 g3+ 10.Kh1 Kxb2 11.d7 Ne2 12.d8Q Kc2 13.Qg5 Kd3 14.Qxg6+ (61.393.286.320) 23880
no chess program was born totally from one mind. all chess programs have many ideas from many minds.
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: A very subtle fortress destruction

Post by bob »

kgburcham wrote:[d] 8/1N1Pb2p/p3p3/1ppP2P1/6p1/P1k5/6PK/2n5 w - -


Engine: Komodo 9.3 64-bit (8192 MB)
by Don Dailey, Larry Kaufman, Mark Lefler
Threads now set to 8

21 0:05 +3.93 1.g6 hxg6 2.d6 Bg5 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 g3+ 6.Kh1 Nd3 7.Nc6 cxb4 8.d7 b3 9.d8Q b2 10.Qa5+ Kb3 11.Qb6+ Kc3 12.Kg1 e5 13.Na5 e4 14.Qb3+ (120.500.355) 20899
21 0:05 +3.83 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Kc4 8.Nxb3 Nxb3 9.d7 a5 10.d8Q a4 11.Qc7+ Kb4 12.Qf4+ Kb5 13.Qxg3 Nc5 14.Kg1 (120.501.394) 20899
-----
<snip>

46 31:27 +5.04 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Ne2 8.Nxb3 Kxb3 9.d7 Kc2 10.d8Q h6 11.Qb6 Kd3 12.Qxa6+ Ke3 13.Qxh6+ Kf2 14.Qb6+ (44.873.866.509) 23772
46 31:27 +5.04 1.g6 hxg6 2.d6 Bf6 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 cxb4 6.Nxe6 b3 7.Nc5 b2 8.Na4+ Kc2 9.Nxb2 g3+ 10.Kh1 Kxb2 11.d7 Ne2 12.d8Q Kc2 13.Qg5 Kd3 14.Qxg6+ (44.873.870.179) 23772
-----
47 42:50 +5.04 1.d6 Bxg5 2.d8Q Bxd8 3.Nxd8 b4 4.axb4 g3+ 5.Kh1 cxb4 6.Nxe6 b3 7.Nc5 Kc4 8.Nxb3 Kxb3 9.d7 Ne2 10.d8Q Kc2 11.Qc8+ Kd1 12.Qxa6 Ke1 13.Qa5+ Kf2 14.Qa7+ (61.393.282.998) 23880
47 42:50 +5.04 1.g6 hxg6 2.d6 Bf6 3.d8Q Bxd8 4.Nxd8 b4 5.axb4 cxb4 6.Nxe6 b3 7.Nc5 b2 8.Na4+ Kc2 9.Nxb2 g3+ 10.Kh1 Kxb2 11.d7 Ne2 12.d8Q Kc2 13.Qg5 Kd3 14.Qxg6+ (61.393.286.320) 23880
I've been wondering the same thing. I've let Crafty search on both moves independently, and by the time the depth gets on up there, it looks like the two produce equal scores. I wonder if d6 really does end up in a draw, or if this is yet another error in endgame studies. Fine certainly had enough exposed over the years, both before and after EGTBs were available.
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