Complex Puzzle

[peter]

Didn't find the position in YACPD.
Added some more variants and comments to my .pgn.
Like the study more and more, thanks for finding and bringing, dear Jon!

[Event "Study CCC, source?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Rossi, P.."]
[Black "?"]
[Result "1-0"]
[Annotator "Martan,Peter"]
[SetUp "1"]
[FEN "8/p5pp/P1P1p1k1/P3P1p1/6p1/P5P1/6Pr/5K2 w - - 0 0"]
[PlyCount "53"]

1. Kg1 Rh6 (1... Kh5 2. c7 h6 3. c8=N g6 4. Nb6 axb6 5. a7 bxa5 6. a8=Q a4 7.
Qd5 Rh4 8. gxh4 exd5 9. e6 gxh4 10. e7 Kg5 11. e8=Q Kf5 12. Qxa4 h3 13. gxh3
gxh3 14. Qd7+ Ke5 15. Qxh3 Kd4 16. a4 Kc4 17. a5 Kb5 18. Qa3 Kc4 19. a6 Kd4 20.
a7 Ke4 21. a8=Q g5 22. Qd6 Kf3 23. Qaxd5+ Kg4 24. Qg2+ Kf5 25. Qf3#) 2. c7 Kh5
3. c8=N (3. c8=Q $2 g6 4. a4 {stalemate}) 3... Kg6 (3... g6 $6 {"solution
variant"} 4. Nb6 axb6 5. a7 bxa5 6. a8=Q a4 7. Qd5 exd5 8. e6 d4 9. e7 d3 10.
e8=N d2 11. Nf6#) 4. a4 (4. Ne7+ $2 Kf7 5. Nc6 Ke8 6. Nxa7 Kd8 7. Nc6+ Kc7 8.
Nd8 Kb8 9. Nc6+ Kc8 10. Nd8 Kb8 11. Nc6+ Kc7 12. Nd8 Kb8 {3fold}) (4. Nxa7 $2
Kh5 5. a4 (5. Nc6 g6 6. a7 {stalemate}) 5... g6 6. Nb5 {stalemate}) 4... Kh5 (
4... Kf5 5. Nxa7 Kxe5 6. Nc6+ Kd6 7. a7 Rf6 8. a8=Q h5 9. a6 Rf7 10. Qb8+ Kc5
11. Qe5+ Kc4 12. Qxe6+ Kc3 13. Qxf7 h4 14. a7 h3 15. a8=Q h2+ 16. Kxh2 Kb2 17.
Qf2+ Kc3 18. Qd4+ Kc2 19. Qb7 g6 20. Qbb2#) (4... Kf7 5. Nxa7 Rg6 6. Nb5 Rf6 7.
exf6 Kxf6 8. a7 Ke5 9. a8=Q h5 10. a6 h4 11. a7 h3 12. Qb8+ Kf6 13. a8=Q h2+
14. Kxh2 Kf5 15. Qf8+ Kg6 16. Qae8+ Kh7 17. Qh8#) 5. Ne7 Rg6 (5... g6 6. Nd5
exd5 7. e6 d4 8. e7 d3 9. e8=N d2 10. Ng7#) 6. Kf2 Kh6 7. Ke3 Kh5 8. Kd4 Rh6 9.
Kc5 Rf6 10. exf6 gxf6 11. Nc8 f5 12. Nxa7 f4 13. Kd4 f3 14. Ke3 fxg2 15. Kf2 e5
16. Nb5 e4 17. a7 e3+ 18. Kxg2 e2 19. Kf2 e1=B+ 20. Kxe1 Kh6 21. a8=Q Kg7 22.
Qe4 Kf6 23. a6 Kg7 24. a7 h5 25. a8=Q h4 26. Qa7+ Kf6 27. Qae7# 1-0

[MikeGL]

yes white wins by checkmate but only if white marches his K correctly : )
8/p5pp/P1P1p1k1/P3P1p1/6p1/P5P1/6Pr/5K2 w - - 0 0

[pgn]
[Event "Complex"]
[Site "Talkchess"]
[Date "2016"]
[Round "?"]
[White "study"]
[Black "study"]
[Result "1-0"]
[BlackElo "2400"]
[Time "09:15:50"]
[WhiteElo "2400"]
[TimeControl "600"]
[SetUp "1"]
[FEN "kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1"]
[Termination "normal"]
[PlyCount "134"]
[WhiteType "human"]
[BlackType "human"]

1. ... Rf8+ 2. Kg7 Bh6+ 3. Kxh6 Rh5+ 4. Kxh5 Rf5+ 5. Ng5 Rxg5+ 6. Kh6 Rxg6+
7. Kh5 Rg5+ 8. Kh4 Rg4+ 9. Kh3 Rg3+ 10. Kh2 Rh3+ 11. Kg2 Rg3+ 12. Kf1 Rf3+
13. Ke1 Re3+ 14. Kd1 Rd3+ 15. Kc1 Rd1+ 16. Kb2 Rd2+ 17. Ka3 Ra2+ 18. Kb4
Ra4+ 19. Kb5 Ra5+ 20. Kc6 Rc5+ 21. Kd7 Rd5+ 22. Ke7 Re5+ 23. Kf7 Rf5+ 24.
Kg7 Rg5+ 25. Bg6 Rxg6+ 26. Kh7 Rg7+ 27. Kh6 Rg6+ 28. Kh5 Rg5+ 29. Kh4 Rg4+
30. Kh3 Rg3+ 31. Kh2 Rh3+ 32. Kg2 Rg3+ 33. Kf1 Rf3+ 34. Ke1 Re3+ 35. Kd1
Rd3+ 36. Kc1 Rd1+ 37. Kb2 Rd2+ 38. Ka3 Ra2+ 39. Kb4 Ra4+ 40. Kb5 Ra5+ 41.
Kc6 Rc5+ 42. Kd7 Rd5+ 43. Nd6 Rxd6+ 44. Ke7 Re6+ 45. Kf8 Rf6+ 46. Kg8 Rg6+
47. Kh7 Rg7+ 48. Kh6 Rg6+ 49. Kh5 Rg5+ 50. Kh4 Rg4+ 51. Kh3 Rg3+ 52. Kh2
Rh3+ 53. Kg2 Rg3+ 54. Kf1 Rf3+ 55. Ke1 Re3+ 56. Kd1 Rd3+ 57. Kc1 Rd1+ 58.
Kb2 Rd2+ 59. Ka3 Ra2+ 60. Kb4 Ra4+ 61. Kb5 Ra5+ 62. Kc4 Ra4+ 63. Kd3 Rd4+
64. Ke3 Rd3+ 65. Kxe4 Rh3 66. c8=Q Rh7 67. Be5+ Ka7 68. Qxh7# 1-0
[/pgn]

[Nordlandia]

Is it horizon effect that cause Stockfish not being certain e.g switching back and fourth between 123+ and 0 few times before settle final conclusion.

[MikeGL]

[d]8/3p3p/1n1p4/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 0

What's the winning line for white on this position?
Seems white is lost on all variations.

Scratching my head regards,

[MikeGL]

[d]8/3p3p/1n1p4/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 0

What's the winning line for white on this position?
Seems white is lost on all variations.

Scratching my head regards,

Edit: Found a forced drawing line for white, but I can't find the winning line as claimed by the composer of this study.

[pgn]
[Event "Study"]
[Site "Talkchess"]
[Date "2016.04.20"]
[Round "?"]
[White "Engine"]
[Black "Engine"]
[Result "*"]
[BlackElo "2400"]
[Time "10:22:33"]
[TimeControl "600"]
[SetUp "1"]
[FEN "8/3p3p/1n1p4/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 1"]
[Termination "unterminated"]
[PlyCount "58"]
[WhiteType "human"]
[BlackType "human"]

1. Nf3+ gxf3 2. O-O-O Kg4 3. Rh1 Kh3 4. Kd1 Kg2 5. Ke1 h5 6. Ba6 Nd5 7. Bb7
(7. Bb5 Nb6 8. Ba6 Nd5 9. Bb7 Nf4 10. Be4 h4 11. Bxf3+ Kxf3 12. Rxh2 h3 13.
Kf1 Kg4 14. Rh1 Kh4 15. Ke1 d5 16. Kf1 Nxd3 17. Ke2 Ne5 18. f4 Nc4 19. Kd3
Nxa3 20. Kxd4 Kg3 21. Kc5 h2 22. f5 Nc4 23. f6 Ne5 24. d4 Nf7 25. Ra1 Kg2
26. Ra2+ Kh3 27. ... {½-½}) 7. ... Nf4 8. Bxf3+ Kxf3 9.
Rxh2 h4 10. Kf1 h3 11. ... {½-½} 1/2-1/2
[/pgn]

[Nordlandia]

[d]krb1K1n1/1pBp1p2/P1p2p1n/P2P1p2/5Pp1/2N3P1/8/8 w - - 0 1

[pgn][Event "2.p L'Italia Scacchistica"]
[Site "?"]
[Date "1971.??.??"]
[Round "?"]
[White "Kuznetsov=AP"]
[Black "(+0347.57e8a8)"]
[Result "1-0"]
[SetUp "1"]
[FEN "krb1K1n1/1pBp1p2/P1p2p1n/P2P1p2/5Pp1/2N3P1/8/8 w - - 0 1"]
[PlyCount "67"]
[EventDate "1971.??.??"]

1. a7 Kxa7 2. Bb6+ Ka6 3. d6 Ra8 4. Kf8 Rb8 5. Kg7 Ra8 6. Kh7 Rb8 7. Kh8 Ra8 8.
Kg7 Rb8 9. Kf8 Ra8 10. Ke8 Rb8 11. Kd8 Ra8 12. Kc7 c5 13. Kd8 Rb8 14. Ke8 Ra8
15. Kf8 Rb8 16. Kg7 Ra8 17. Kh7 Rb8 18. Kh8 Ra8 19. Kg7 Rb8 20. Kf8 Ra8 21. Ke8
Rb8 22. Kd8 Ra8 23. Kc7 c4 24. Kd8 Rb8 25. Ke8 Ra8 26. Kf8 Rb8 27. Kg7 Ra8 28.
Kh7 Rb8 29. Kh8 Ra8 30. Kg7 Rb8 31. Kf8 Ra8 32. Ke8 Rb8 33. Kd8 Ra8 34. Kc7 1-0[/pgn]

[d]8/1p3pp1/8/1p5B/2p1pP2/2P1P3/kP2K3/8 w - - 0 1

[pgn][Event "Ceskoslovensky Sach#140"]
[Site "?"]
[Date "1960.??.??"]
[Round "?"]
[White "Kuznetsov=A"]
[Black "(+0010.46e2a2)"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/1p3pp1/8/1p5B/2p1pP2/2P1P3/kP2K3/8 w - - 0 1"]
[PlyCount "65"]
[EventDate "1960.??.??"]

{Ceskoslovensky Sach/11} 1. b4 g6 $1 2. Bg4 f5 3. Bh3 Kb3 4. Kd2 Kb2 5. Bg2 $1
Kb1 6. Bf1 Kb2 7. Be2 Kb1 8. Bd1 Kb2 9. Bc2 Ka3 10. Kc1 Ka2 11. Bd1 Ka1 12. Kc2
Ka2 13. Be2 Ka1 14. Bf1 Ka2 15. Bg2 Ka1 16. Bh3 Ka2 17. Bf1 Ka1 18. Be2 Ka2 19.
Bd1 Ka1 20. Kc1 Ka2 21. Bc2 b6 22. Bd1 Ka1 23. Kc2 Ka2 24. Be2 Ka1 25. Bf1 Ka2
26. Bg2 Ka1 27. Bh3 Ka2 28. Bf1 Ka1 29. Be2 Ka2 30. Bd1 Ka1 31. Kc1 Ka2 32. Bc2
Ka1 33. Bb1 1-0

[/pgn]

[pgn][Event "1.p Szachy#0131 @3"]
[Site "?"]
[Date "1973.??.??"]
[Round "?"]
[White "Bondarenko=F Kuznetsov=AP"]
[Black "(+0114.47e1g5)"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/3p4/1n1p3p/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 1"]
[PlyCount "35"]
[EventDate "1973.??.??"]

{Szachy/9 EG#02258 @3: Veitch=W EG=41 7/1975} 1. Nf3+ $1 gxf3 2. O-O-O $1 Kg4
3. Rh1 Kh3 4. Kd1 Kg2 5. Ke1 Kxh1 (5... h5 $1 {<cook WV>} 6. Ba6 Nd5 7. Bb7 Nf4
8. Bxf3+ (8. Rxh2+ Kxh2 9. Kf1 d5) (8. Be4 h4) 8... Kxf3 9. Rxh2 h4 10. Kf1 h3
11. Rh1 d5 12. Rg1 Ng2 13. Rh1 Nf4 14. Rh2 Kg4) 6. Kf1 d5 $1 (6... Nd5 7. Bxa4)
7. Ba6 $1 Na8 8. Bc8 Nb6 9. Bb7 h5 10. Ba6 Na8 11. Bc8 Nb6 12. Bb7 h4 13. Ba6
Na8 14. Bc8 Nb6 15. Bb7 h3 16. Ba6 Na8 (16... Nc8 $1 {<cook WV>}) (16... d6 17.
Bb7 Nd7 18. Bxd5 Ne5 19. Be4) 17. Bc8 Nb6 18. Bb7 1-0

[/pgn]

It's cooked.

[Nordlandia]

[d]1kB3qn/4Kp2/6p1/3N2P1/1N6/8/8/8 w - - 0 0

Author claims white wins

[Paloma]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Neue Partie"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1kB3qn/4Kp2/6p1/3N2P1/1N6/8/8/8 w - - 0 1"]
[PlyCount "72"]

1. Nc6+ Kxc8 2. Nf6 Qg7 3. Na5 Qxf6+! {cook}
[/pgn]

[Nordlandia]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "6r1/R1N2kp1/5P2/6PK/8/8/4rp2/8 w - - 0 0"]
[PlyCount "2"]

1. Ne8+ Ke6 {cook!} *

[/pgn]



[d]8/4B3/4p3/8/2rk1P2/2n5/2B5/4K3 w - - 0 0

[Nordlandia]

Code: Select all

R7/5p1p/1pB3p1/5bP1/K1R5/P1Pk2r1/1p3P2/8 w - - 0 0