Maybe it's difficult for engines

[peter]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1"]
[PlyCount "27"]

1. Qxa1 $3 (1. Qxd8 $2 $11) 1... Nb3+ 2. Kc4 (2. Kb4 Nxa1 3. Kc3 $3) 2... Nxa1
3. Kc3 $3 (3. Bxd8 $2 Nc2) 3... Bxa5+ 4. Kb2 Kg8 5. Kxa1 Kh8 6. Kb2 Kg8 7.
Kb3 Kh8 8. Kc4 Kg8 9. Kc5 Kh8 10. Kd5 Kg8 11. Kc6 Kh8 12. Kd7 Kg8 13. Ke8 h5
14. Kd7 *

[/pgn]

The full version is very very long and I'm lazy.

And (or) I'm too stupid for it yet still.
How do you get the white Knight out of the a8-corner without exchanging it to free one black Bishop, if Black doesn't leave a5- d8 diagonal with this one Bishop? If you let that happen (exchange of free white Night against free black Bishop) how to capture f-Bishop then without stale- mating?

[peter]

The End of the solution can be this:
[pgn]
[Event "?"]
[Site "?"]
[Date "2021.04.02"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "5b1k/2N1p1p1/2K1PpP1/8/8/7p/5p1p/5Nbr w - -"]

1. Nb5 f5 2. Nd4 f4 3. Kd7 f3 4. Nf5 Kg8 5. Ke8 Kh8 6. Nh6
gxh6 7. Kxf8 h5 8. g7+ Kh7 9. g8=Q+ Kh6 10. Qg7# *
[/pgn]

[d]N2b1bk1/4p1p1/4PpP1/1K5p/8/8/5p1p/5Nbr w - -
After Ka6 Bc7?, Nxc7 is mate in 13, but bishop does not have to move to c7

And if this one free black Bishop is exchanged against free white Night sooner or later, there's no white figure left for capturing f-Bishop but the King, giving so stalemate after march of black free pawns is done.

[Hobacle]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1"]
[PlyCount "117"]

1. Qxa1 Nb3+ 2. Kc4 Nxa1 3. Kc3 Bxa5+ 4. Kb2 Kg8 5. Kxa1 Kh8 6. Kb2 Kg8 7. Kb3
Kh8 8. Kc4 Kg8 9. Kd5 Kh8 10. Kc5 Kg8 11. Kc6 Kh8 12. Kd7 Kg8 13. Ke8 h5 14.
Kd7 Kh8 15. Kc6 Kg8 16. Kd5 Kh8 17. Ke4 Kg8 18. Kf4 Kh8 19. Kg3 Kg8 20. Kh4 Kh8
21. Kxh5 Kg8 22. Kg4 ({God of Chess:} 22. Kg4 Bd8 23. Kf4 Ba5 24. Ke4 Bd8 25.
Kd5 Ba5 26. Kc6 Kh8 27. Kd7 Kg8 28. Ke8 f5 29. Kd7 Kh8 30. Kc6 Bd8 31. Kd5 Ba5
32. Ke5 Bc3+ 33. Kxf5 Bd4 34. Ke4 Bc5 35. Kd5 Ba7 36. Kc6 Bd4 37. Nc7 Bc3 38.
Na6 Kg8 39. Nc5 Bd2 40. Kd7 Be3 41. Ne4 Kh8 42. Kd8 Kg8 43. Ke8 Bd4 44. Ng5 Bb2
45. Nh7 Be5 46. Nxf8 Bd6 47. Nd7 Bc7 48. Kxe7 Ba5 49. Ke8 Bc7 50. e7 Bf4 51.
Nf6+ gxf6 52. Kd7 Kg7 53. e8=Q Kh6 54. Ke6 Kg5 55. g7 Kg4 56. g8=Q+ Kh4 57.
Qh7+ Bh6 58. Qxh6+ Kg4 59. Qeh5# {#38/80}) 22... Kh8 23. Kf5 Kg8 24. Ke4 Kh8
25. Kd5 Kg8 26. Kc6 Kh8 27. Kd7 Kg8 28. Ke8 f5 29. Kd7 Kh8 30. Kc6 Kg8 31. Kd5
f4 32. Ke4 Bd2 33. Nb6 Bc1 34. Nc4 Be3 35. Kd5 Bc1 36. Kc6 Be3
37. Kd7 Bd4 38. Ke8 f3 39. Ncd2 Be5 40. Nxf3 Bf4 41. Kd8 Kh8
42. Kd7 Kg8 43. Ke8 Bg3 44. Ng5 Bd6 45. Nh7 Ba3 46. Nxf8 Bd6 47. Nh7 Bc5 48.
Ng5 Ba3 49. Nf7 Bb2 50. Nd8 Bc3 51. Nc6 Bb2 52. Nxe7+ Kh8 53. Kf7 Bc3 54. Nf5
Bb4 55. Nxg7 Be7 56. Nf5 Bf6 57. e7 Bxe7 58. g7+ Kh7 59. g8=Q# *

[/pgn]

All I can do.

[Nordlandia]

It looks like if white times it right, Ke8 and black is in Zugzwang.

[Dann Corbit]

Indeed, the study is correct with one or two minor wrinkles.
It is possible that some of his alternate moves are equally correct, but hidden by Stockfish's powerful draw magnet.

Code: Select all

8/4bKPk/8/5N2/8/8/5p1p/5Nbr w - - acd 50; bm g8=Q+; ce 32766; c3 "g8=Q#"; dm 1; pm g8=Q+; pv g8=Q+; move 59a; 
7k/4bKP1/8/5N2/8/8/5p1p/5Nbr b - - acd 50; bm Kh7; ce -32765; c3 "Kh7"; dm -1; pm Kh7; pv Kh7 g8=Q+; move 58b; 
7k/4bK2/6P1/5N2/8/8/5p1p/5Nbr w - - acd 50; bm g7+; ce 32764; c3 "g7+"; dm 2; pm g7+; pv g7+ Kh7 g8=Q+; move 58a; 
7k/4PK2/5bP1/5N2/8/8/5p1p/5Nbr b - - acd 50; bm Bg7; ce -32763; c3 "Bxe7"; dm -2; pm Bg7; pv Bg7 e8=Q+ Bf8 Qxf8+; move 57b; 
7k/5K2/4PbP1/5N2/8/8/5p1p/5Nbr w - - acd 50; bm e7; ce 32762; c3 "e7"; dm 3; pm e7; pv e7 Bg7 e8=Q+ Bf8 Qxf8+; move 57a; 
7k/4bK2/4P1P1/5N2/8/8/5p1p/5Nbr b - - acd 50; bm Bf8; ce -32761; c3 "Bf6"; dm -3; pm Bf8; pv Bf8 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 56b; 
7k/4bKN1/4P1P1/8/8/8/5p1p/5Nbr w - - acd 50; bm Nf5; ce 32760; c3 "Nf5"; dm 4; pm Nf5; pv Nf5 Bf8 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 56a; 
7k/5KN1/4P1P1/8/1b6/8/5p1p/5Nbr b - - acd 50; bm Ba3; ce -32759; c3 "Be7"; dm -4; pm Ba3; pv Ba3 Nf5 Bb2 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 55b; 
7k/5Kp1/4P1P1/5N2/1b6/8/5p1p/5Nbr w - - acd 50; bm Nxg7; ce 32758; c3 "Nxg7"; dm 5; pm Nxg7; pv Nxg7 Ba3 Nf5 Bb2 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 55a; 
7k/5Kp1/4P1P1/5N2/8/2b5/5p1p/5Nbr b - - acd 50; bm Bf6; ce -32757; c3 "Bb4"; dm -5; pm Bf6; pv Bf6 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 54b; 
7k/4NKp1/4P1P1/8/8/2b5/5p1p/5Nbr w - - acd 50; bm Nf5; ce 32756; c3 "Nf5"; dm 6; pm Nf5; pv Nf5 Bf6 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 54a; 
7k/4NKp1/4P1P1/8/8/8/1b3p1p/5Nbr b - - acd 50; bm Bf6; ce -32755; c3 "Bc3"; dm -6; pm Bf6; pv Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 53b; 
4K2k/4N1p1/4P1P1/8/8/8/1b3p1p/5Nbr w - - acd 50; bm Kf7; ce 32754; c3 "Kf7"; dm 7; pm Kf7; pv Kf7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 53a; 
4K1k1/4N1p1/4P1P1/8/8/8/1b3p1p/5Nbr b - - acd 50; bm Kh8; ce -32753; c3 "Kh8"; dm -7; pm Kh8; pv Kh8 Kf7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 52b; 
4K1k1/4p1p1/2N1P1P1/8/8/8/1b3p1p/5Nbr w - - acd 50; bm Nxe7+; ce 32752; c3 "Nxe7+"; dm 8; pm Nxe7+; pv Nxe7+ Kh8 Kf7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 52a; 
4K1k1/4p1p1/2N1P1P1/8/8/2b5/5p1p/5Nbr b - - acd 50; bm Be1; ce -32751; c3 "Bb2"; dm -8; pm Be1; pv Be1 Nxe7+ Kh8 Kf7 Ba5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 51b; 
3NK1k1/4p1p1/4P1P1/8/8/2b5/5p1p/5Nbr w - - acd 50; bm Nc6; ce 32750; c3 "Nc6"; dm 9; pm Nc6; pv Nc6 Bf6 Nxe7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 51a; 
3NK1k1/4p1p1/4P1P1/8/8/8/1b3p1p/5Nbr b - - acd 50; bm Ba3; ce -32749; c3 "Bc3"; dm -9; pm Ba3; pv Ba3 Nc6 Bc1 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 50b; 
4K1k1/4pNp1/4P1P1/8/8/8/1b3p1p/5Nbr w - - acd 50; bm Nd8; ce 32748; c3 "Nd8"; dm 10; pm Nd8; pv Nd8 Ba3 Nc6 Bc1 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 50a; 
4K1k1/4pNp1/4P1P1/8/8/b7/5p1p/5Nbr b - - acd 50; bm Bc5; ce -32747; c3 "Bb2"; dm -10; pm Bc5; pv Bc5 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bc7 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 49b; 
4K1k1/4p1p1/4P1P1/6N1/8/b7/5p1p/5Nbr w - - acd 50; bm Nf7; ce 32746; c3 "Nf7"; dm 11; pm Nf7; pv Nf7 Bc5 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bc7 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 49a; 
4K1k1/4p1p1/4P1P1/2b3N1/8/8/5p1p/5Nbr b - - acd 50; bm Bd6; ce -32745; c3 "Ba3"; dm -11; pm Bd6; pv Bd6 Nf7 Bc7 Nd8 Bg3 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 48b; 
4K1k1/4p1pN/4P1P1/2b5/8/8/5p1p/5Nbr w - - acd 50; bm Ng5; ce 32744; c3 "Ng5"; dm 12; pm Ng5; pv Ng5 Bd6 Nf7 Bc7 Nd8 Bg3 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 48a; 
4K1k1/4p1pN/3bP1P1/8/8/8/5p1p/5Nbr b - - acd 50; bm Bb4; ce -32743; c3 "Bc5"; dm -12; pm Bb4; pv Bb4 Ng5 Bc5 Nf7 Bd4 Nd8 Bf6 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 47b; 
4KNk1/4p1p1/3bP1P1/8/8/8/5p1p/5Nbr w - - acd 50; bm Nh7; ce 32742; c3 "Nh7"; dm 13; pm Nh7; pv Nh7 Bb4 Ng5 Bc5 Nf7 Bd4 Nd8 Bf6 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bg5 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 47a; 
4KNk1/4p1p1/4P1P1/8/8/b7/5p1p/5Nbr b - - acd 50; bm Bd6; ce -32741; c3 "Bd6"; dm -13; pm Bd6; pv Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bg5 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 46b; 
4Kbk1/4p1pN/4P1P1/8/8/b7/5p1p/5Nbr w - - acd 50; bm Nxf8; ce 32740; c3 "Nxf8"; dm 14; pm Nxf8; pv Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bg5 Nc6 Bh4 Nxe7+ Kh8 Kf7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 46a; 
4Kbk1/4p1pN/3bP1P1/8/8/8/5p1p/5Nbr b - - acd 50; bm Bb8; ce -32739; c3 "Ba3"; dm -14; pm Bb8; pv Bb8 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Ke8 Bc1 Nb8 Kh8 Nc6 Ba3 Ne7 Bc5 Kf7 Bb6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 45b; 
4Kbk1/4p1p1/3bP1P1/6N1/8/8/5p1p/5Nbr w - - acd 50; bm Nh7; ce 32738; c3 "Nh7"; dm 15; pm Nh7; pv Nh7 Bf4 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Be3 Nd5 Bc5+ Ke8 Kh8 Kf7 Ba3 Ne7 Bd6 Nf5 Bf8 Nxg7 Ba3 Nf5 Bb2 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 45a; 
4Kbk1/4p1p1/4P1P1/6N1/8/6b1/5p1p/5Nbr b - - acd 50; bm Bf4; ce -32737; c3 "Bd6"; dm -15; pm Bf4; pv Bf4 Nh7 Bg3 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nc8 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 44b; 
4Kbk1/4p1p1/4P1P1/8/8/5Nb1/5p1p/5Nbr w - - acd 50; bm Ng5; ce 32736; c3 "Ng5"; dm 16; pm Ng5; pv Ng5 Bf4 Nh7 Bg3 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nc8 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 44a; 
4Kbk1/4p1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr b - - acd 50; bm Be3; ce -32735; c3 "Bg3"; dm -16; pm Be3; pv Be3 Ne5 Bb6 Nd7 Bc7 Nxf8 Bb6 Nh7 Bc5 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Nxe7 Bc5 Kf7 Bb6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 43b; 
5bk1/3Kp1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr w - - acd 50; bm Ke8; ce 32734; c3 "Ke8"; dm 17; pm Ke8; pv Ke8 Be3 Ne5 Bb6 Nd7 Bc7 Nxf8 Bb6 Nh7 Bc5 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Nxe7 Bc5 Kf7 Bb6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 43a; 
5b1k/3Kp1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr b - - acd 50; bm Bd6; ce -32733; c3 "Kg8"; dm -17; pm Bd6; pv Bd6 Ke8 Kg8 Ng5 Bb4 Nh7 Bc5 Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 42b; 
3K1b1k/4p1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr w - - acd 50; bm Kd7; ce 32732; c3 "Kd7"; dm 18; pm Kd7; pv Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 42a; 
3K1bk1/4p1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr b - - acd 50; bm Kh8; ce -32731; c3 "Kh8"; dm -18; pm Kh8; pv Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 41b; 
4Kbk1/4p1p1/4P1P1/8/5b2/5N2/5p1p/5Nbr w - - acd 50; bm Kd8; ce 32730; c3 "Kd8"; dm 19; pm Kd8; pv Kd8 Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf7 Bf4 Nd8 Bd6 Nc6 Kh8 Kf7 Be5 Nxe7 Bf6 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 41a; 
4Kbk1/4p1p1/4P1P1/4b3/8/5N2/5p1p/5Nbr b - - acd 50; bm Bf4; ce -32729; c3 "Bf4"; dm -19; pm Bf4; pv Bf4 Kd8 Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Ba5 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nd5 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 40b; 
4Kbk1/4p1p1/4P1P1/4b3/8/5p2/3N1p1p/5Nbr w - - acd 50; bm Nxf3; ce 32728; c3 "Nxf3"; dm 20; pm Nxf3; pv Nxf3 Bf4 Kd8 Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Ba5 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nd5 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 40a; 
4Kbk1/4p1p1/4P1P1/8/3b4/5p2/3N1p1p/5Nbr b - - acd 50; bm Be3; ce -32727; c3 "Be5"; dm -20; pm Be3; pv Be3 Nxf3 Bf4 Kd8 Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Ba5 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nd5 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 39b; 
4Kbk1/4p1p1/4P1P1/8/2Nb4/5p2/5p1p/5Nbr w - - acd 50; bm Ncd2; ce 32726; c3 "Ncd2"; dm 21; pm Ncd2; pv Ncd2 Be3 Nxf3 Bf4 Kd8 Kh8 Kd7 Bc1 Ke8 Kg8 Ne5 Bf4 Nd7 Bc7 Nxf8 Ba5 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nd5 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bh4 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 39a; 
4Kbk1/4p1p1/4P1P1/8/2Nb1p2/8/5p1p/5Nbr b - - acd 50; bm f3; ce -32725; c3 "f3"; dm -21; pm f3; pv f3 Kd7 Bf6 Ncd2 Bg5 Nxf3 Bh6 Kd8 Bc1 Ne5 Bf4 Nd7 Bg3 Ke8 Bf4 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nc8 Bf6 Ne7+ Kh8 Kf7 Bh4 Nf5 Bd8 Nxg7 Bg5 Nf5 Bf6 e7 Bg7 e8=Q+ Bf8 Qxf8+; move 38b; 
5bk1/3Kp1p1/4P1P1/8/2Nb1p2/8/5p1p/5Nbr w - - acd 40; bm Ke8; ce 32730; c3 "Ke8"; dm 19; pm Ke8; pv Ke8 f3 Ncd2 Be3 Ne4 Bd4 Ng5 Bf6 Nh7 Bc3 Nxf8 Ba5 Nh7 Bb4 Ng5 Ba5 Kxe7 Bb4+ Kd7 Ba3 Nh7 Kh8 e7 Bxe7 Kxe7 Kg8 Ke8 Kh8 Nf6 gxf6 Kf7 f5 g7+ Kh7 g8=Q+ Kh6 Qg6+; move 38a; 
5bk1/3Kp1p1/4P1P1/8/2N2p2/4b3/5p1p/5Nbr b - - acd 50; bm Bd4; ce -32723; c3 "Bd4"; dm -22; pm Bd4; pv Bd4 Ke8 f3 Kd7 Bf6 Ncd2 Bg5 Nxf3 Bc1 Kd8 Kh8 Ne5 Ba3 Nd7 Kg8 Ke8 Bb4 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Ke8 Bc1 Nb8 Kh8 e7 Bg5 Kf7 Bxe7 Kxe7 Kg8 Nd7 Kh8 Nf6 gxf6 Kf7 f5 g7+ Kh7 g8=Q+ Kh6 Qg6+; move 37b; 
5bk1/4p1p1/2K1P1P1/8/2N2p2/4b3/5p1p/5Nbr w - - acd 41; bm Kd7; ce 32728; c3 "Kd7"; dm 20; pm Kd7; pv Kd7 Bc5 Ke8 Bd4 Ncd2 Ba7 Ne4 Bd4 Ng5 Bc5 Nh7 Bb6 Nxf8 Ba5 Nd7 Bc7 Kxe7 f3 Nb8 Bg3 Nc6 Bh4+ Ke8 Bg3 Ne7+ Kh8 Kf7 Bd6 Nf5 Bf8 Ne7 Bxe7 Kxe7 Kg8 Kd7 Kh8 e7 Kg8 e8=Q+; move 37a; 
5bk1/4p1p1/2K1P1P1/8/2N2p2/8/5p1p/2b2Nbr b - - acd 50; bm Be3; ce -32725; c3 "Be3"; dm -21; pm Be3; pv Be3 Ne5 Bd4 Nf3 Bf6 Kc7 Kh8 Kd8 Bb2 Ke8 Kg8 Ng5 f3 Nh7 Bc3 Nxf8 Ba5 Nd7 Bc7 Kxe7 Bf4 Nb6 Bh6 Ke8 Bg5 Nd5 Kh8 Ne7 Bh6 Kf7 Bg5 Nf5 Bh4 Nxg7 Bg5 Nf5 Bf6 Kxf6 Kg8 e7 Kh8 e8=Q+; move 36b; 
5bk1/4p1p1/4P1P1/3K4/2N2p2/8/5p1p/2b2Nbr w - - acd 50; bm Kc6; ce 32726; c3 "Kc6"; dm 21; pm Kc6; pv Kc6 Be3 Kd7 Bd4 Ncd2 Be5 Ne4 Bf6 Ke8 Bd4 Ng5 Bc3 Nh7 Bb4 Nxf8 Bd6 Nd7 Bc7 Kxe7 Ba5 Ke8 Bd2 e7 f3 Nf8 Bg5 Nh7 Bh4 Kd7 Bxe7 Kxe7 Kh8 Nf6 gxf6 Kf7 f5 g7+ Kh7 g8=Q+ Kh6 Qg6+; move 36a; 
5bk1/4p1p1/4P1P1/3K4/2N2p2/4b3/5p1p/5Nbr b - - acd 50; bm Ba7; ce -32723; c3 "Bc1"; dm -22; pm Ba7; pv Ba7 Ncd2 f3 Nxf3 Be3 Kc6 Kh8 Kd7 Kg8 Kd8 Bb6+ Ke8 Bc5 Ng5 Be3 Nh7 Bc5 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Kd7 Bh4 e7 Bxe7 Kxe7 Kh8 Nd7 Kg8 Ke8 Kh8 Nf6 gxf6 Kf7 f5 g7+ Kh7 g8=Q+ Kh6 Qg6+; move 35b; 
5bk1/4p1p1/4P1P1/8/2N1Kp2/4b3/5p1p/5Nbr w - - acd 45; bm Kd5; ce 32724; c3 "Kd5"; dm 22; pm Kd5; pv Kd5 Kh8 Kc6 Bd4 Kd7 Kg8 Ke8 f3 Ncd2 Be3 Ne4 Bb6 Ng5 Bd4 Nh7 Bc3 Nxf8 Ba5 Nh7 Bb4 Ng5 Bd6 Nf7 Bb8 Nd8 Bd6 Nc6 Bc5 Nxe7+ Kh8 Kf7 Bd6 Nf5 Bc5 Nxg7 Ba3 Nf5 Bf8 e7 Bxe7 g7+ Kh7; move 35a; 
5bk1/4p1p1/4P1P1/8/2N1Kp2/8/5p1p/2b2Nbr b - - acd 50; bm f3; ce -32723; c3 "Be3"; dm -22; pm f3; pv f3 Kd5 Bg5 Kc6 Bh4 Kd7 Bf6 Ke8 Bd4 Ncd2 Be3 Ne4 Bf4 Nc5 Bc7 Nd7 Bf4 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg5+ Ke8 Bc1 Nd5 Kh8 Kf7 Ba3 Ne7 Bb2 Nf5 Bf6 Nxg7 Bh4 Nf5 Bf6 e7 Bxe7 g7+ Kh7 g8=Q+; move 34b; 
5bk1/4p1p1/1N2P1P1/8/4Kp2/8/5p1p/2b2Nbr w - - acd 50; bm Nc4; ce 32722; c3 "Nc4"; dm 23; pm Nc4; pv Nc4 f3 Kd5 Bg5 Kc6 Bh4 Kd7 Bf6 Ke8 Bd4 Ncd2 Be3 Ne4 Bf4 Nc5 Bc7 Nd7 Ba5 Nxf8 Bb6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg5+ Ke8 Bc1 Nd5 Kh8 Kf7 Ba3 Ne7 Bb2 Nf5 Bf6 Nxg7 Bh4 Nf5 Bf6 e7 Bxe7 g7+ Kh7 g8=Q+; move 34a; 
5bk1/4p1p1/1N2P1P1/8/4Kp2/8/3b1p1p/5Nbr b - - acd 50; bm Be3; ce -32719; c3 "Bc1"; dm -24; pm Be3; pv Be3 Nd7 Bd2 Kd5 Bc1 Kc6 Bd2 Kc7 Ba5+ Kc8 f3 Kb7 Be1 Kc7 Ba5+ Kc8 Kh8 Nxf8 Kg8 Nh7 Bb4 Kd7 Ba3 Ke8 Bc5 Ng5 Bd4 Nf7 Bc3 Nd8 Bb4 Nc6 Bd2 Nxe7+ Kh8 Kf7 Ba5 Nf5 Bb4 Nxg7 Bc5 Nf5 Bf8 e7 Bxe7 g7+ Kh7 g8=Q+; move 33b; 
N4bk1/4p1p1/4P1P1/8/4Kp2/8/3b1p1p/5Nbr w - - acd 51; bm Nb6; ce 32718; c3 "Nb6"; dm 25; pm Nb6; pv Nb6 Bb4 Kd5 Bd2 Nd7 Bc1 Kc6 Bd2 Kc7 Ba5+ Kc8 f3 Kb7 Bc3 Kc7 Ba5+ Kc8 Kh8 Nxf8 Kg8 Nh7 Bb4 Kd7 Bc5 Ke8 Bb4 Ng5 Bc3 Nf7 Be1 Ne5 Bb4 Nc6 Bc3 Nxe7+ Kh8 Kf7 Bf6 Nf5 Bg5 Nxg7 Bh4 Nf5 Bf6 e7 Bxe7 g7+ Kh7 g8=Q+; move 33a; 
N4bk1/4p1p1/4P1P1/b7/4Kp2/8/5p1p/5Nbr b - - acd 65; bm Kh8; ce -32703; c3 "Bd2"; dm -32; pm Kh8; pv Kh8 Kd5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Bd2 Nb6 Bc3 Nd7 Ba5 Ne5 Bc3 Nxf3 Bf6 Kd7 Kh8 Kd8 Kg8 Ke8 Bc3 Ng5 Bf6 Nh7 Be5 Nxf8 Bd6 Nd7 Bc7 Kxe7 Bf4 Nb6 Bg3 Ke8 Bh4 Nc8 Bf6 Ne7+ Kh8; move 32b; 
N4bk1/4p1p1/4P1P1/b2K4/5p2/8/5p1p/5Nbr w - - acd 63; bm Kc6; ce 32706; c3 "Ke4"; dm 31; pm Kc6; pv Kc6 Bd8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc6 Kg8 Kb7 Kh8 Kb8 Kg8 Kc8 Bd2 Nb6 Bc3 Nd7 Ba5 Ne5 Bc3 Nxf3 Bf6 Kd7 Kh8 Kd8 Kg8 Ke8 Bc3 Ng5 Bf6 Nh7 Be5 Nxf8 Bd6 Nh7 Bb4 Ng5 Bd6 Nf3 Bc5 Nh4 Bd4 Nf5 Bc5 Nxe7+ Kh8 Kf7 Bd6 Nf5; move 32a; 
N4bk1/4p1p1/4P1P1/b2K1p2/8/8/5p1p/5Nbr b - - acd 69; bm Kh8; ce -32699; c3 "f4"; dm -34; pm Kh8; pv Kh8 Kc5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Bd8 Kd5 Ba5 Ke4 Kg8 Kxf4 Bd2+ Ke4 Ba5 Ke5 Bd2 Nb6 Bh6 Nd7 Bg5 Kd5 Bf4 Kc6 Bd6 Kb7 Bb4 Kc7 Ba5+ Kc8 Kh8 Nxf8 Kg8 Nh7 Bd2 Kd8 Bb4 Ke8 Bc5 Ng5 Bd6 Nf3 Bf4 Nd4 Bc1; move 31b; 
N4bk1/4p1p1/2K1P1P1/b4p2/8/8/5p1p/5Nbr w - - acd 87; bm Kc5; ce 32682; c3 "Kd5"; dm 43; pm Kc5; pv Kc5 Kh8 Kd5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Bd8 Kd5 Kg8 Ke5 Ba5 Kd4 Bd2 Kd5 Ba5 Kc6 Bd8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb7 Bd8 Kb8 Ba5 Kc8 Bc3 Nb6 Bd2 Nd7 Ba5 Kb7 Be1 Kc7 Ba5+ Kc8 Bd2 Kd8 Be3 Ke8; move 31a; 
N4b1k/4p1p1/2K1P1P1/b4p2/8/8/5p1p/5Nbr b - - acd 91; bm Bd8; ce -32677; c3 "Kg8"; dm -45; pm Bd8; pv Bd8 Kc5 Ba5 Kb5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kb5 Bd8 Kc5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Bc3 Nb6 Bd2 Nd7 Ba5 Ne5 Bc3 Nxf3 Bb2 Kd7 Bc1 Kc7 Bf4+ Kc8 Be3 Kd8 Bf4; move 30b; 
N4b1k/3Kp1p1/4P1P1/b4p2/8/8/5p1p/5Nbr w - - acd 85; bm Kc8; ce 32684; c3 "Kc6"; dm 42; pm Kc8; pv Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke4 Bd8 Kxf4 Ba5 Ke4 Bd2 Nb6 Ba5; move 30a; 
N4bk1/3Kp1p1/4P1P1/b4p2/8/8/5p1p/5Nbr b - - acd 99; bm Kh8; ce -32669; c3 "Kh8"; dm -49; pm Kh8; pv Kh8 Kc8 Kg8 Kb8 Bd8 Kb7 Kh8 Kc8 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kb7 Kh8 Kb8 Bd8 Kc8 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc6 Kg8 Kb5 Bc3 Nb6 Bd2 Nd7 Bf4 Kb6 Kh8 Kb7 Bd2 Nxf8 Ba5 Nh7 Kg8 Kc6 Kh8 Kd7 Bb4 Kd8; move 29b; 
N3Kbk1/4p1p1/4P1P1/b4p2/8/8/5p1p/5Nbr w - - acd 91; bm Kd7; ce 32678; c3 "Kd7"; dm 45; pm Kd7; pv Kd7 Kh8 Kc8 Kg8 Kb7 Bd8 Kb8 Kh8 Kc8 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc8 Kg8 Kb7 Kh8 Kb8 Bd8 Kc8 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Bc3 Nb6 Bb4 Nd7 Kg8 Kc8 Ba5 Ne5 Bd2 Kd8 Bf4 Nxf3; move 29a; 
N3Kbk1/4p1p1/4PpP1/b7/8/8/5p1p/5Nbr b - - acd 97; bm f5; ce -32671; c3 "f5"; dm -48; pm f5; pv f5 Kd7 Kh8 Kc6 Bd8 Kb7 Ba5 Kb8 Bd8 Kc8 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc8 Kg8 Kb7 Kh8 Kb8 Kg8 Kc8 Kh8 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc6 Kg8 Kb5 Bd2 Nb6 Be3 Nc4 Bf4 Kc6 Kh8 Kd7 Kg8 Ke8 Bc7 Ncd2 Bd6 Kd7 Bc5 Nxf3; move 28b; 
N4bk1/3Kp1p1/4PpP1/b7/8/8/5p1p/5Nbr w - - acd 97; bm Ke8; ce 32672; c3 "Ke8"; dm 48; pm Ke8; pv Ke8 f5 Kd7 Kh8 Kc8 Kg8 Kb8 Bd8 Kb7 Ba5 Kc8 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc8 Kg8 Kb7 Kh8 Kb8 Bd8 Kc8 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc6 Bd8 Kb7 Ba5 Kb8 Kg8 Kc8 Bc3 Nb6 Bd2 Nd7 Kh8 Kd8 Bg5; move 28a; 
N4b1k/3Kp1p1/4PpP1/b7/8/8/5p1p/5Nbr b - - acd 111; bm Kg8; ce -32657; c3 "Kg8"; dm -55; pm Kg8; pv Kg8 Ke8 f5 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc8 Kg8 Kb7 Bd8 Ka6 Kh8 Ka7 Kg8 Kb7 Ba5 Kc8 Kh8 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Bd2 Nb6 Be1 Nd7 Ba5; move 27b; 
N4b1k/4p1p1/2K1PpP1/b7/8/8/5p1p/5Nbr w - - acd 99; bm Kd7; ce 32670; c3 "Kd7"; dm 49; pm Kd7; pv Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kb5 Kg8 Kc5 Ba5 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Bd8 Kc5 Ba5 Kb5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Kh8 Kb7 Kg8 Kc8 Bb4 Nb6 Kh8 Kd7 Bc5 Nc4 Bd4 Kd8 Kg8; move 27a; 
N4bk1/4p1p1/2K1PpP1/b7/8/8/5p1p/5Nbr b - - acd 50; bm Bd8; ce -15266; c3 "Kh8"; pm Bd8; pv Bd8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kb5 Bd8 Kc5 Ba5 Kc6 Kh8 Kd7 f4 Kc6 Kg8 Kb5 Bd8 Kc5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb7 Kh8 Ka6 Bd2 Nb6 Kg8 Kb7 Bb4 Kc8 Bc5 Nc4 Bd4 Kd7 Bc3 Kd8 Bd4; move 26b; 
N4bk1/4p1p1/4PpP1/b2K4/8/8/5p1p/5Nbr w - - acd 135; bm Kc6; ce 32634; c3 "Kc6"; dm 67; pm Kc6; pv Kc6 Bd8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kb5 Kg8 Kc5 Ba5 Kc6 Bd8 Kd7 Ba5 Ke8 f4 Kd7 Kh8 Kc6 Bd8 Kb5 Kg8 Kc5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc6 Kg8 Kb5 Bd2 Nb6 Bf4 Kc6 Be3 Nd7 Bf4 Kb6 Be3+ Kc7; move 26a; 
N4b1k/4p1p1/4PpP1/b2K4/8/8/5p1p/5Nbr b - - acd 133; bm Kg8; ce -32635; c3 "Kg8"; dm -66; pm Kg8; pv Kg8 Kc6 Bd8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kc5 Kh8 Kb5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kc5 Kh8 Kd5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb7 Bd8 Kb8 Ba5 Kc8 Kh8 Kd7 Kg8 Ke8 Be1; move 25b; 
N4b1k/4p1p1/4PpP1/b7/4K3/8/5p1p/5Nbr w - - acd 137; bm Kd5; ce 32632; c3 "Kd5"; dm 68; pm Kd5; pv Kd5 Bd8 Kc6 Kg8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kc5 Kh8 Kb5 Bd8 Kc6 Kg8 Kd7 Ba5 Ke8 f4 Kd7 Kh8 Kc6 Bd8 Kb5 Kg8 Kc5 Ba5 Kc6 Bd8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc8 Kg8 Kb8 Bd8 Kb7 Ba5 Kc8 Be1 Nb6 Bd2 Nd7; move 25a; 
N4bk1/4p1p1/4PpP1/b7/4K3/8/5p1p/5Nbr b - - acd 50; bm Kh8; ce -15266; c3 "Kh8"; pm Kh8; pv Kh8 Kd5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kc5 Ba5 Kd5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kb5 Bd8 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f3 Kd7 Kh8 Kc6 Kg8 Kb7 Kh8 Kb8 Kg8 Kc8 Bd2 Nb6 Bg5 Nd7; move 24b; 
N4bk1/4p1p1/4PpP1/b4K2/8/8/5p1p/5Nbr w - - acd 129; bm Ke4; ce 32640; c3 "Ke4"; dm 64; pm Ke4; pv Ke4 Kh8 Kd5 Kg8 Kc6 Bd8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kc5 Ba5 Kd5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Kg8 Kxf4 Bd2+ Ke4 Ba5 Ke5 Bd2 Nb6 Bg5 Ke4 Bd2 Nd7 Bb4 Kd5 Bc3 Kc6 Ba5; move 24a; 
N4b1k/4p1p1/4PpP1/b4K2/8/8/5p1p/5Nbr b - - acd 50; bm Bd8; ce -15266; c3 "Kg8"; pm Bd8; pv Bd8 Kf4 Ba5 Ke4 Bd8 Kd4 Ba5 Kc5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kb5 Bd8 Kc5 Ba5 Kc6 Bd8 Kd7 Ba5 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Bc3+ Ke4 Kg8 Nb6 f3 Kxf3 Bd4 Nd7 Bf6 Kf4 Bh4 Ke4 Bg5 Kd5 Bf4; move 23b; 
N4b1k/4p1p1/4PpP1/b7/6K1/8/5p1p/5Nbr w - - acd 50; bm Kf5; ce 15266; c3 "Kf5"; pm Kf5; pv Kf5 Kg8 Ke4 Bd8 Kd5 Ba5 Kc6 Kh8 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kb5 Bd8 Kc5 Ba5 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Kg8 Ke4 Kh8 Kf5 Kg8 Kxf4 Bd2+ Ke4 Ba5 Ke5 Bd2 Nb6 Bg5 Ke4 Bf6 Nd7; move 23a; 
N4bk1/4p1p1/4PpP1/b7/6K1/8/5p1p/5Nbr b - - acd 145; bm Bd8; ce -32623; c3 "Kh8"; dm -72; pm Bd8; pv Bd8 Kf5 Ba5 Ke4 Kh8 Kd4 Kg8 Kc5 Bd8 Kd5 Ba5 Kc6 Bd8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kd5 Ba5 Kc5 Kg8 Kc6 Kh8 Kd7 Kg8 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kc5 Kh8 Kb5 Bd8 Kc6 Kg8 Kd7 Ba5 Ke8 f3 Kd7 Kh8 Kc8 Kg8; move 22b; 
N4bk1/4p1p1/4PpP1/b6K/8/8/5p1p/5Nbr w - - acd 143; bm Kg4; ce 32626; c3 "Kg4"; dm 71; pm Kg4; pv Kg4 Bd8 Kf5 Ba5 Ke4 Kh8 Kd5 Kg8 Kc5 Bd8 Kb5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kd5 Ba5 Kc5 Kg8 Kc6 Bd8 Kd7 Ba5 Ke8 f4 Kd7 Kh8 Kc6 Kg8 Kc5 Kh8 Kd5 Kg8 Ke4 Bc3 Nb6 f3 Kd5 Ba5 Nc4 Bc7 Kc6; move 22a; 
N4b1k/4p1p1/4PpP1/b6K/8/8/5p1p/5Nbr b - - acd 95; bm Bd2; ce -32673; c3 "Kg8"; dm -47; pm Bd2; pv Bd2 Kg4 Ba5 Kf5 Kg8 Ke4 Bd8 Kd5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Bc3+ Kxf5 Bd4 Nc7 Bb6 Na6 Bd4 Ke4 Bb2 Kd5 Kg8 Nc5 Ba3 Nd7 Bb4 Kc6 Ba5 Kb7 Bd8 Kb8 Kh8 Nxf8 Ba5 Kc8 Kg8 Nh7 Bb4 Kd8; move 21b; 
N4b1k/4p1p1/4PpP1/b6p/7K/8/5p1p/5Nbr w - - acd 121; bm Kxh5; ce 32648; c3 "Kxh5"; dm 60; pm Kxh5; pv Kxh5 Bd2 Kg4 Ba5 Kf5 Kg8 Ke4 Bd8 Kd5 Ba5 Kc6 Kh8 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Bc3+ Kxf5 Bd4 Ke4 Ba7 Kd5 Be3 Nc7 Bg5 Ke4 Bc1 Nd5 Bb2 Nb6 Bf6 Kd5 Kg8 Kc5 Bb2 Nd7 Bf6 Kc6 Bc3 Kc7 Ba5+ Kc8 Kh8 Nxf8; move 21a; 
N4bk1/4p1p1/4PpP1/b6p/7K/8/5p1p/5Nbr b - - acd 50; bm Bd2; ce -15266; c3 "Kh8"; pm Bd2; pv Bd2 Nc7 Kh8 Kxh5 Be3 Nd5 Ba7 Kg4 Bd4 Kf5 Bc5 Nc7 Bb4 Kg4 Ba5 Na8 Kg8 Kf5 Bd8 Ke4 Kh8 Kd4 Kg8 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Kg8 Kxf5 Be1 Nb6 Ba5 Nd7 Bb4 Ke4 Ba5 Kd5 Bb4 Nb8; move 20b; 
N4bk1/4p1p1/4PpP1/b6p/8/6K1/5p1p/5Nbr w - - acd 107; bm Kh4; ce 32662; c3 "Kh4"; dm 53; pm Kh4; pv Kh4 Kh8 Kxh5 Bd8 Kg4 Ba5 Kf5 Bd8 Ke4 Kg8 Kd5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Bc3+ Kxf5 Bd4 Ke4 Bc5 Nc7 Kg8 Nb5 Kh8 Kd5 Be3 Na3 Bd2 Kc6 Bc3 Kd7 Kg8 Nc4 Bf6 Ncd2 Bb2; move 20a; 
N4b1k/4p1p1/4PpP1/b6p/8/6K1/5p1p/5Nbr b - - acd 109; bm Bd2; ce -32659; c3 "Kg8"; dm -54; pm Bd2; pv Bd2 Kh4 Ba5 Kxh5 Bd8 Kg4 Ba5 Kf3 Bd8 Ke4 Kg8 Kd5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kc5 Ba5 Kd4 Kg8 Ke5 Bc3+ Kxf5 Bd4 Ke4 Ba7 Nc7 Bb6 Na6 Ba7 Nb4 Bc5 Nc6 Ba3 Ne5 Bb2 Nf3 Bc1 Kd5 Bh6 Kc6 Be3 Kd7; move 19b; 
N4b1k/4p1p1/4PpP1/b6p/5K2/8/5p1p/5Nbr w - - acd 119; bm Kg3; ce 32650; c3 "Kg3"; dm 59; pm Kg3; pv Kg3 Be1 Kh4 Kg8 Kxh5 Ba5 Kg4 Kh8 Kf5 Bd8 Ke4 Kg8 Kd5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Kg8 Kd5 Kh8 Ke5 Bc3+ Kxf5 Bd4 Ke4 Bc5 Nc7 Ba3 Na6 Kg8 Kd5 Bc1 Nb8 Bf4 Nd7 Bd2 Kc6 Bb4 Nb6 Ba5 Nc4 Bb4 Kd5 Be1; move 19a; 
N4bk1/4p1p1/4PpP1/b6p/5K2/8/5p1p/5Nbr b - - acd 50; bm Bd2+; ce 0; c3 "Kh8"; pm Bd2+; pv Bd2+ Kg3 Bg5 Nb6 Kh8 Nd7 Kg8 Kh3 Kh8 Kg2 Bf4 Nb6 Bh6 Kh3 Bg5 Kg3 Kg8 Nd7 Kh8 Kf3 Kg8; move 18b; 
N4bk1/4p1p1/4PpP1/b6p/4K3/8/5p1p/5Nbr w - - acd 50; bm Kf3; ce 0; c3 "Kf4"; pm Kf3; pv Kf3 Bd2 Kg3 Bg5 Nb6 Be3 Nd7 Bg5 Nc5 Kh8 Nd3 Kg8; move 18a; 
N4b1k/4p1p1/4PpP1/b6p/4K3/8/5p1p/5Nbr b - - acd 50; bm Bc3; ce 0; c3 "Kg8"; pm Bc3; pv Bc3 Kf3 Bd2 Nb6 Bg5 Kg2 Be3 Nc4 Bg5; move 17b; 
N4b1k/4p1p1/4PpP1/b2K3p/8/8/5p1p/5Nbr w - - acd 50; bm Ke4; ce 0; c3 "Ke4"; pm Ke4; pv Ke4 Bc3 Kf3 Bd2 Kg3 Bg5 Nb6 Kg8 Kh3 Kh8; move 17a; 
N4bk1/4p1p1/4PpP1/b2K3p/8/8/5p1p/5Nbr b - - acd 50; bm Bd2; ce 0; c3 "Kh8"; pm Bd2; pv Bd2 Ke4 Bc3 Kf4 Bd2+; move 16b; 
N4bk1/4p1p1/2K1PpP1/b6p/8/8/5p1p/5Nbr w - - acd 50; bm Kd5; ce 0; c3 "Kd5"; pm Kd5; pv Kd5 Bd2 Ke4 Bc1 Nb6 Kh8 Kf3 Bg5 Kg3 Kg8 Na8 Kh8 Kg2 Kg8; move 16a; 
N4b1k/4p1p1/2K1PpP1/b6p/8/8/5p1p/5Nbr b - - acd 50; bm Bd2; ce -817; c3 "Kg8"; pm Bd2; pv Bd2 Kd5 Bf4 Ke4 Bh6 Kf3 Bc1 Kg3 Bg5 Nc7 Kg8 Nb5 Kh8 Nd4 Kg8 Nf5 Kh8 Kf3 h4 Kg4 Kg8 Nd4 Be3 Nc6 Bg5 Kh3 Kh8 Nb4 Kg8 Nd5 f5 Nb4 Kh8 Kg2 Bf6 Nc6 Bg5 Nd4 Bf6 Nb5 Be5 Kh3 Bf6 Na3 Kg8 Nc2 Bg5 Nd4 Bf6 Nxf5 Bg5 Kg4 Bf6 N5e3 Bd4 Nc4; move 15b; 
N4b1k/3Kp1p1/4PpP1/b6p/8/8/5p1p/5Nbr w - - acd 50; bm Kc6; ce 567; c3 "Kc6"; pm Kc6; pv Kc6 Bd2 Kd5 Kg8 Ke4 Bg5 Kf3 Bd2 Kg3 Bg5 Nc7 Kh8 Na6 Kg8 Nb8 Kh8 Nc6 Kg8 Nd4 Be3 Nb5 Bg5 Na3 Kh8 Kh3 Kg8 Nc2 Kh8 Nd4 Be3 Ne2 Bg5 Kg2 Kg8 Kg3 Kh8 Kf3 Bh6 Neg3 h4 Ne2 Bg5 Nc3 Kg8 Kg4 Kh8 Ne4 Kg8 Kh3 Kh8 Nc5 Be3 Nb3 Bg5 Nd4 Kg8 Nf5 Kh8 Nxh4 Bxh4 Kxh4 f5 Kg3 Kg8 Kf4 Kh8 Kf3; move 15a; 
N4bk1/3Kp1p1/4PpP1/b6p/8/8/5p1p/5Nbr b - - acd 50; bm Bd2; ce -827; c3 "Kh8"; pm Bd2; pv Bd2 Kc6 Bg5 Kd5 Bd2 Ke4 Kh8 Kf3 Bg5 Kg3 Kg8 Nc7 Kh8 Nd5 Kg8 Nc3 Bd2 Ne2 Bg5 Kh3 Kh8 Kg2 Bh6 Kg3 Bg5 Kf3 Bd2 Neg3 Bc3 Kg2 Be5 Ne2 f5 Kh3 Bf6 Kg3 Bg5 Nc3 Kg8 Nd5 Kh8 Kf3 Bc1 Nb4 Bg5 Nc6 f4 Ke4 Kg8 Nd4 Bh6 Nf3 Kh8 Ne5 Kg8 Nc4 Bg5 Kf5 Bh4 Kxf4 Bf6 Nce3 Bc3 Nf5 Bd2+ Ke4 Bb4 Kd5 Kh8; move 14b; 
N3Kbk1/4p1p1/4PpP1/b6p/8/8/5p1p/5Nbr w - - acd 50; bm Kd7; ce 836; c3 "Kd7"; pm Kd7; pv Kd7 Kh8 Kc6 Bb4 Kd5 Be1 Ke4 Bd2 Kf3 Bh6 Kg3 Bg5 Nc7 Kg8 Nb5 Kh8 Nd4 Be3 Nf5 Bg5 Kf3 Bd2 N5g3 Bc3 Kg2 Be5 Ne2 f5 Kh3 Bf6 Kg3 Bg5 Nd4 f4+ Kf3 Kg8 Nc2 Kh8 Ke4 Kg8 Kf5 Bh6 Na3 Kh8 Nc4 f3 Nb6 Be3 Nd5 Bd2 Ke4 Bh6 Ke5 Bd2 Kf5 Kg8 Ke4 Bh6 Kxf3 Bd2 Nc7 Bc1 Nb5 Kh8 Nc3 Bh6; move 14a; 
N3Kbk1/4p1p1/4PpPp/b7/8/8/5p1p/5Nbr b - - acd 50; bm f5; ce 0; c3 "h5"; pm f5; pv f5 Kd7 f4 Kc6 Kh8 Nb6 Bd2 Nc4 Be3 Kc7 Kg8 Kd7 Bd4 Ke8 f3 Na5 Bb6 Nb3 Ba7 Kd8 Kh8 Kd7 Be3 Na5 Kg8 Nc4 Bd4 Ke8 Bc3 Nb6 Bd2 Nd7 Bf4 Nxf8 Bd6 Nd7 h5 Nf8 Bc5 Nh7 Ba3 Ng5 Bd6 Nf7 h4 Nd8 Ba3 Nc6 Bc5 Nxe7+ Kh8 Nf5 Bb6 Kf8 Bc5+ Kf7; move 13b; 
N4bk1/3Kp1p1/4PpPp/b7/8/8/5p1p/5Nbr w - - acd 50; bm Ke8; ce 0; c3 "Ke8"; pm Ke8; pv Ke8 f5 Kd7 f4 Kc6 Kh8 Nb6 Kg8 Kc7 Kh8 Kb7 Bc3 Nc4 Bd4 Kc6 Kg8 Kd7 Ba7 Kc7 Bd4 Kd8 Bc3 Ke8 Bd4 Na5 Be5 Nc4; move 13a; 
N4b1k/3Kp1p1/4PpPp/b7/8/8/5p1p/5Nbr b - - acd 50; bm Kg8; ce 0; c3 "Kg8"; pm Kg8; pv Kg8 Ke8 f5 Kd7 f4 Kc6 Kh8 Nb6 Kg8; move 12b; 
N4b1k/4p1p1/2K1PpPp/b7/8/8/5p1p/5Nbr w - - acd 50; bm Kd7; ce 0; c3 "Kd7"; pm Kd7; pv Kd7 Kg8 Ke8 f5 Kd7 f4 Kc6 Kh8 Nb6 Kg8 Nc4 Bc3 Kd5 Bf6 Nb6 Kh8 Kc6 Kg8; move 12a; 
N4bk1/4p1p1/2K1PpPp/b7/8/8/5p1p/5Nbr b - - acd 50; bm Bb4; ce 0; c3 "Kh8"; pm Bb4; pv Bb4 Nb6 Bd6 Kd7 Bc5 Kc7 Bb4 Nd7 Ba5+ Kc8 f5 Ne5 Bc3 Nc4 Bf6 Nb6 Bc3; move 11b; 
N4bk1/4p1p1/4PpPp/b1K5/8/8/5p1p/5Nbr w - - acd 50; bm Nb6; ce 1036; c3 "Kc6"; pm Nb6; pv Nb6 Bc3 Kc6 Bb2 Nd7 Be5 Kb7 Bc3 Kc7 Ba5+ Kc8 h5 Kb7 Bc3 Kc7 Ba5+ Kc8 h4 Kb7 Bd2 Kc7 Ba5+ Kc8 h3 Kb7 Bb4 Nb6 Bc5 Na4 Bd4 Kc6 Be5 Kd5 Bc7 Nc5 Be5 Ke4 Bd6 Nd7 f5+ Kxf5 Bg3 Kg4 Bd6 Kxh3 Bf4 Kh4; move 11a; 
N4b1k/4p1p1/4PpPp/b1K5/8/8/5p1p/5Nbr b - - acd 50; bm Bd2; ce -654; c3 "Kg8"; pm Bd2; pv Bd2 Kb5 Kg8 Nc7 Bc3 Na6 Bd4 Kc6 Be5 Kd7 Bd4 Kc7 h5 Kb7 Bc3 Kc6 Bd2 Nc5 Bc3 Na4 Ba5 Kd5 Bd2 Ke4 Bg5 Nc3 Bh6 Ne2 Bd2 Kf3 h4 Kg4 Bg5 Nc3 Kh8 Kh3 Bd2 Na4 Bg5 Nc5 Kg8 Na6 Kh8 Kg4 Kg8 Nb4 Kh8 Nc2 Kg8 Na3; move 10b; 
N4b1k/4p1p1/4PpPp/b2K4/8/8/5p1p/5Nbr w - - acd 50; bm Kc5; ce 899; c3 "Kc5"; pm Kc5; pv Kc5 Bd2 Kb5 Be3 Nc7 Ba7 Na6 Be3 Kc6 Bd4 Nb8 Be5 Nd7 Bd6 Kb7 Bb4 Kb6 Bd6 Kc6 Kg8 Kb7 Bb4 Kc7 Ba5+ Kc8 f5 Kb7 Bb4 Kc7 Ba5+ Kc8 h5 Kb7 Bb4 Nb6 Kh8 Kc6 Ba5 Nc4 Bc3 Kd5 Bf6 Nce3 f4 Nc4 Bg5 Ke4 f3 Nb6 Bc1 Na4 Bg5 Nc5 Bf6 Kxf3 Bd4 Nd7 Bb2 Nb6 Bc1 Ke4 Bg5 Kf5 Bc1 Na4 Bh6 Nc5 Be3 Ne4; move 10a; 
N4bk1/4p1p1/4PpPp/b2K4/8/8/5p1p/5Nbr b - - acd 50; bm Kh8; ce -933; c3 "Kh8"; pm Kh8; pv Kh8 Kc5 Bd2 Kc6 Bc3 Nb6 Ba5 Nd7 Kg8 Kb7 Bb4 Kc7 Ba5+ Kc8 f5 Kb7 Bb4 Kc7 Ba5+ Kc8 f4 Kb7 Be1 Kb6 Bc3 Kb5 Ba1 Kc5 Bf6 Kc6 h5 Kd5 Kh8 Nb6 Bb2 Ke4 f3 Nd7 Bf6 Nc5 Ba1 Na6 Bf6 Kf4 Kg8 Kxf3 Be5 Nb4 Bb2 Kg3 Bf6 Kf4 Bc3 Nc6 Bf6 Nb8 Bh4 Nd7 Kh8 Nb6 Bf6 Nd5 Kg8; move 09b; 
N4bk1/4p1p1/4PpPp/b7/2K5/8/5p1p/5Nbr w - - acd 50; bm Kb5; ce 824; c3 "Kd5"; pm Kb5; pv Kb5 Bd8 Kc5 Kh8 Kc6 Kg8 Kd7 Ba5 Ke8 h5 Kd7 h4 Kc6 Kh8 Kc5 Bd2 Kd4 Ba5 Ke4 Be1 Kf5 Bd2 Kg4 Bg5 Nb6 Kg8 Nc4 Kh8 Na3 Bc1 Nb5 Bg5 Nd4 Be3 Nf5 Bg5 Kf3 Kg8 Ke4 Kh8 Kd5 Kg8 Kc6 Kh8 Kd7 h3 Kc6 Bc1 Nd4 Bf4 Kd5 Be5 Nc6 Bc3 Ke4 Bb2 Kf5 Ba1 Kg4 Be5 Kxh3 Kg8; move 09a; 
N4b1k/4p1p1/4PpPp/b7/2K5/8/5p1p/5Nbr b - - acd 50; bm Kg8; ce -844; c3 "Kg8"; pm Kg8; pv Kg8 Kb5 Bd8 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 h5 Kd7 Bd2 Kc6 Be3 Kd5 Bf4 Ke4 Bg5 Kf3 Bd2 Kg2 Bg5 Kg3 Kh8 Nc7 Kg8 Nb5 Kh8 Nc3 Kg8 Ne2 h4+ Kg4 Kh8 Nc3 Kg8 Nd5 Kh8 Nc7 Kg8 Kh3 Bf4 Nd5 Bg3 Kg4 Kh8 Kf3 Kg8 Nde3 Bb8 Nf5 Bg3 Ke4 Kh8 Kd5 Be5 Nxh4; move 08b; 
N4b1k/4p1p1/4PpPp/b7/8/1K6/5p1p/5Nbr w - - acd 50; bm Ka4; ce 876; c3 "Kc4"; pm Ka4; pv Ka4 Bd8 Kb5 Kg8 Kb4 Kh8 Kc5 Ba5 Kb5 Bd8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Bc3 Nc7 Bd4 Na6 Be3 Kc6 Bc1 Kb7 Bd2 Nc5 Bb4 Nd7 Ba5 Kc8 h5 Ne5 Bc3 Nc4 h4 Kd7 Ba1 Nb6 Bd4 Nd5 Kh8 Kc6 Kg8 Kc7 Bf6 Nde3 Bg5 Nc2 Bf4+ Kd7 Bg5 Kc6 Bf6 Kd5 Bb2 Nce3 f4 Nc2 Kh8 Ke4 Bc3 Nd4 Kg8; move 08a; 
N4bk1/4p1p1/4PpPp/b7/8/1K6/5p1p/5Nbr b - - acd 50; bm Bd8; ce -876; c3 "Kh8"; pm Bd8; pv Bd8 Kb4 Kh8 Kc5 Ba5 Kb5 Bd8 Kc6 Kg8 Kd7 Ba5 Ke8 h5 Kd7 Bc3 Kc6 Bd4 Kd5 Be3 Ke4 Bh6 Nb6 Bd2 Kd5 Bh6 Kd4 Bf4 Nd7 Bd6 Kc4 h4 Kb5 Kh8 Kb6 Kg8 Kc6 Bg3 Kb5 f5 Kb6 Bf4 Kc6 Bd6 Nb6 Bf4 Kd7 Bd6 Ke8 Bg3 Nd5 Bd6 Nde3 f4 Nc4 f3 Kd7 Kh8; move 07b; 
N4bk1/4p1p1/4PpPp/b7/8/8/1K3p1p/5Nbr w - - acd 50; bm Kb3; ce 884; c3 "Kb3"; pm Kb3; pv Kb3 Bd8 Kb4 Kh8 Kb5 Kg8 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Bd2 Nb6 Ba5 Kc6 Bc3 Kc5 Ba5 Nd7 Bd2 Kb5 Bc3 Kb6 Bb4 Kc7 Ba5+ Kc8 f4 Kb7 Bc3 Kb6 Bb4 Kc7 Ba5+ Kc8 h5 Kb7 Kh8 Kc6 Kg8 Nb6 Kh8 Nc4 Bc3 Kd5 f3 Nb6 Bf6 Ke4 Bh4 Kf4 Kg8 Nd5 Bf6 Ke4 Bb2 Nf4 h4; move 07a; 
N4b1k/4p1p1/4PpPp/b7/8/8/1K3p1p/5Nbr b - - acd 50; bm Bd8; ce -892; c3 "Kg8"; pm Bd8; pv Bd8 Ka3 Kg8 Ka4 Kh8 Kb4 Kg8 Kb5 f5 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f4 Kd7 Bc3 Kc6 Bd4 Nc7 Bc3 Na6 f3 Nc5 Ba5 Kb7 Bc3 Nd7 Ba5 Kc8 h5 Kb7 Bc3 Kb6 Bb4 Nc5 Kh8 Kc6 Be1 Nd7 Kg8 Ne5 Bb4 Nxf3 Ba3 Kd5 Bc1 Nd4 Bb2 Nf5 Ba3 Ke4 Kh8 Nd4 Bb2 Ne2 Ba1 Kf5 Bb2 Nf4; move 06b; 
N4b1k/4p1p1/4PpPp/b7/8/8/5p1p/K4Nbr w - - acd 50; bm Kb2; ce 892; c3 "Kb2"; pm Kb2; pv Kb2 Bd8 Ka3 Ba5 Kb3 Kg8 Kc4 Bd8 Kc5 Kh8 Kc6 Ba5 Kd7 Kg8 Ke8 f5 Kd7 Kh8 Kc6 Bd8 Kb5 Kg8 Kc5 Kh8 Kb4 Kg8 Ka3 h5 Kb4 Kh8 Kb5 f4 Kc6 Ba5 Nb6 Bb4 Nd7 Bd6 Kb7 Kg8 Nb6 Bc5 Kc7 Bd6+ Kc6 Be5 Nd7 Bd4 Kc7 Bc3 Kd8 Bd2 Ke8 h4 Ne5 Bc3 Nf3 h3 Ng5 Bd2 Nh7 Be1 Nxf8 Ba5; move 06a; 
N4bk1/4p1p1/4PpPp/b7/8/8/5p1p/K4Nbr b - - acd 50; bm Bc3+; ce -892; c3 "Kh8"; pm Bc3+; pv Bc3+ Ka2 Bd4 Kb3 Kh8 Kc4 Ba7 Nc7 Bb8 Na6 Bd6 Kb5 Kg8 Kc6 f5 Kb7 Bg3 Nc5 Bd6 Nd7 Bb4 Kc7 Ba5+ Kc8 h5 Kb7 Bd2 Ne5 Be3 Nf3 Kh8 Kc6 Bc1 Kd5 Ba3 Nh4 f4 Ke4 Bb2 Nf3 Kg8 Kd5 Kh8 Ne5 Bc1 Nf7+ Kg8 Ke5 Bd2 Ke4 Be3 Ne5 Bc1 Nc4 Kh8 Kf5 f3; move 05b; 
N4bk1/4p1p1/4PpPp/b7/8/8/1K3p1p/n4Nbr w - - acd 50; bm Kxa1; ce 900; c3 "Kxa1"; pm Kxa1; pv Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Kb4 Ba7 Kb5 Kg8 Kc6 Bd4 Nc7 Be5 Na6 Bd6 Kb7 h5 Kc6 Bf4 Nc5 h4 Nd7 Bg3 Nb6 Bd6 Kb7 Bc5 Nd7 Bd6 Kc8 f5 Nb6 Bc5 Nc4 Bd4 Kd7 Bf6 Na3 Kh8 Kc6 Bc3 Kd5 Ba1 Nc4 Bc3 Nce3 Bd2 Nxf5 Bg5 Ke5 Kg8 Ke4 Bf6 Kf3; move 05a; 
N4b1k/4p1p1/4PpPp/b7/8/8/1K3p1p/n4Nbr b - - acd 50; bm f5; ce -900; c3 "Kg8"; pm f5; pv f5 Kxa1 f4 Kb2 Kg8 Kb3 Bd8 Kb4 Kh8 Kb5 Kg8 Kc5 Kh8 Kc6 Ba5 Kd7 f3 Kc6 Bd2 Kb5 Kg8 Nb6 Bg5 Kc6 Bd2 Nd7 Bf4 Kb5 Bc7 Ka6 Bd6 Kb6 Bf4 Kc6 h5 Kd5 Bc7 Kc5 Bg3 Kd4 Bh4 Ke4 Kh8 Ne5 Kg8 Kf5 Kh8 Nxf3 Bf6 N3d2 Bc3 Nc4 Bf6 Nb6 Bh4; move 04b; 
N4b1k/4p1p1/4PpPp/b7/8/2K5/5p1p/n4Nbr w - - acd 50; bm Kb2; ce 909; c3 "Kb2"; pm Kb2; pv Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Kc4 Be3 Nc7 Bf4 Nd5 Bg5 Kb5 Kg8 Kc6 Kh8 Nb6 Bd2 Nd7 Kg8 Kc7 Ba5+ Kc8 f5 Kb7 Bd8 Kb8 Ba5 Kc8 h5 Kb7 Bd8 Kc6 Ba5 Nb8 Be1 Na6 h4 Nc5 Bb4 Nd7 Bd2 Kc7 Ba5+ Kb7 Bc3 Kc8 Bb4 Ne5 Kh8 Kd8 h3 Nd7 Bd6 Ke8 Kg8 Nxf8 Kh8 Kf7 Bc7 Nd7 Bd6; move 04a; 
N2b1b1k/4p1p1/4PpPp/B7/8/2K5/5p1p/n4Nbr b - - acd 50; bm Bxa5+; ce -909; c3 "Bxa5+"; pm Bxa5+; pv Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Kc4 Be3 Nc7 Bf4 Nd5 Bg5 Kb5 Kg8 Nc7 Kh8 Na6 Bd2 Kc6 Kg8 Nc5 Be3 Nd7 Bf4 Kb7 Bd2 Kc7 Ba5+ Kc8 f5 Kb7 f4 Kc6 f3 Kb5 Bd2 Kb6 Bf4 Kc6 h5 Nb6 Kh8 Kb5 Bb8 Nd5 Bd6 Kc4 Be5 Kd3 h4 Ke4 Bf6 Kf4 Ba1 Kf5 Bf6 Ke4 Bg5 Kd3 Kg8 Nb6; move 03b; 
N2b1b1k/4p1p1/4PpPp/B7/2K5/8/5p1p/n4Nbr w - - acd 50; bm Kc3; ce 909; c3 "Kc3"; pm Kc3; pv Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Kc4 Be3 Kb4 Ba7 Nc7 Bb8 Na6 Be5 Kb5 Bd4 Kc6 Be5 Nc5 Bd6 Nd7 Kg8 Kb7 Bb4 Kc7 Ba5+ Kc8 f5 Kb7 f4 Kc6 f3 Kb5 Bd2 Kb6 Bf4 Kc6 h5 Kb5 Bc1 Kb6 Bd2 Kc5 Kh8 Kc4 Ba5 Kb5 Bd2 Nxf8 Bg5 Kc6 Kg8 Nh7 Bf6 Kd7 h4 Nxf6+ gxf6 Kxe7 Kg7 Kd6 Kxg6 e7; move 03a; 
N2b1b1k/4p1p1/4PpPp/B7/2K5/1n6/5p1p/Q4Nbr b - - acd 50; bm Nxa1; ce -909; c3 "Nxa1"; pm Nxa1; pv Nxa1 Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Ka3 Kg8 Kb4 h5 Kb5 Ba1 Nb6 Bc3 Kc4 Ba5 Nd7 Bd2 Kc5 Ba5 Kc6 h4 Kb7 Bc3 Kc7 Ba5+ Kc8 f5 Kb7 Bc3 Kc6 Ba5 Kd5 Bc3 Nb6 Bf6 Kc6 Be5 Nc4 Bf4 Na3 Bd6 Nc2 Be5 Nce3 f4 Nc2; move 02b; 
N2b1b1k/4p1p1/4PpPp/B1K5/8/1n6/5p1p/Q4Nbr w - - acd 50; bm Kb4; ce 917; c3 "Kc4"; pm Kb4; pv Kb4 Nxa1 Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Ka3 Bc5+ Kb3 Bd4 Kb4 h5 Kc4 Be3 Kc3 Bf4 Nb6 Bc7 Nd7 Bd8 Kc4 Ba5 Kb5 Bc7 Kc6 Bf4 Kb7 Bd2 Kc7 Ba5+ Kc8 f5 Kb8 Kh8 Kb7 Kg8 Kc6 Bd2 Nb6 Bf4 Kd5 Be3 Nc4 Bf4 Na3 Kh8 Nc2 Bd2 Nd4 f4 Ke4 Bc3 Nc6 Ba1 Kxf4 Bf6 Nd8 Kg8 Nf7 Bc3; move 02a; 
N2b1b1k/4p1p1/4PpPp/B1K5/8/8/3n1p1p/Q4Nbr b - - acd 50; bm Nb3+; ce -917; c3 "Nb3+"; pm Nb3+; pv Nb3+ Kb4 Nxa1 Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Kb3 Kh8 Kb4 Ba7 Kc4 Be3 Kb5 Bd4 Nc7 h5 Kb4 Bb6 Na8 Be3 Kc4 Ba7 Kd5 Bb8 Nb6 Kg8 Nd7 Bd6 Kc6 Bf4 Kb6 f5 Kc6 Bd2 Kc7 Ba5+ Kc8 h4 Kb7 Be1 Kc6 Bb4 Nb6 Bd6 Nd5 Bb8 Kb5 Be5 Nde3 f4 Nd5 Bd6 Kc4 Be5 Nb6; move 01b; 
N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - acd 50; bm Qxa1; ce 901; c3 "Qxa1"; pm Qxa1; pv Qxa1 Nb3+ Kc4 Nxa1 Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Ka3 Bc5+ Kb3 Bd4 Kb4 h5 Kb3 Be3 Kc3 Bf4 Kd4 Bd2 Nb6 Bf4 Nd7 Bg3 Kc3 Bc7 Kc4 Bg3 Kb5 h4 Kc4 Bc7 Kc5 Ba5 Kd4 Bb4 Kd3 Kh8 Kc4 Bd6 Kb5 Kg8 Kc6 Be5 Kb7 Bc3 Kc7 Ba5+ Kc8 f5 Kb7 Bc3 Kc7 Ba5+ Kc8; move 01a; 

I think that Nb6 instead of Kc6 may be pivotal here (which, in itself, makes this position an exquisite problem):
[d]N4bk1/4p1p1/4PpPp/b1K5/8/8/5p1p/5Nbr w - - acd 50; bm Nb6; ce 1036; c3 "Kc6"; pm Nb6; pv Nb6 Bc3 Kc6 Bb2 Nd7 Be5 Kb7 Bc3 Kc7 Ba5+ Kc8 h5 Kb7 Bc3 Kc7 Ba5+ Kc8 h4 Kb7 Bd2 Kc7 Ba5+ Kc8 h3 Kb7 Bb4 Nb6 Bc5 Na4 Bd4 Kc6 Be5 Kd5 Bc7 Nc5 Be5 Ke4 Bd6 Nd7 f5+ Kxf5 Bg3 Kg4 Bd6 Kxh3 Bf4 Kh4; move 11a;

And with enough coaxing, SF sees a win for the start position of the problem:
[d]N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - acd 50; bm Qxa1; ce 901; c3 "Qxa1"; pm Qxa1; pv Qxa1 Nb3+ Kc4 Nxa1 Kc3 Bxa5+ Kb2 Kg8 Kxa1 Bc3+ Ka2 Bd4 Ka3 Bc5+ Kb3 Bd4 Kb4 h5 Kb3 Be3 Kc3 Bf4 Kd4 Bd2 Nb6 Bf4 Nd7 Bg3 Kc3 Bc7 Kc4 Bg3 Kb5 h4 Kc4 Bc7 Kc5 Ba5 Kd4 Bb4 Kd3 Kh8 Kc4 Bd6 Kb5 Kg8 Kc6 Be5 Kb7 Bc3 Kc7 Ba5+ Kc8 f5 Kb7 Bc3 Kc7 Ba5+ Kc8; move 01a;

[peter]

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1"]
[PlyCount "117"]

1. Qxa1 Nb3+ 2. Kc4 Nxa1 3. Kc3 Bxa5+ 4. Kb2 Kg8 5. Kxa1 Kh8 6. Kb2 Kg8 7. Kb3
Kh8 8. Kc4 Kg8 9. Kd5 Kh8 10. Kc5 Kg8 11. Kc6 Kh8 12. Kd7 Kg8 13. Ke8 h5 14.
Kd7 Kh8 15. Kc6 Kg8 16. Kd5 Kh8 17. Ke4 Kg8 18. Kf4 Kh8 19. Kg3 Kg8 20. Kh4 Kh8
21. Kxh5 Kg8 22. Kg4 ({God of Chess:} 22. Kg4 Bd8 23. Kf4 Ba5 24. Ke4 Bd8 25.
Kd5 Ba5 26. Kc6 Kh8 27. Kd7 Kg8 28. Ke8 f5 29. Kd7 Kh8 30. Kc6 Bd8 31. Kd5 Ba5
32. Ke5 Bc3+ 33. Kxf5 Bd4 34. Ke4 Bc5 35. Kd5 Ba7 36. Kc6 Bd4 37. Nc7 Bc3 38.
Na6 Kg8 39. Nc5 Bd2 40. Kd7 Be3 41. Ne4 Kh8 42. Kd8 Kg8 43. Ke8 Bd4 44. Ng5 Bb2
45. Nh7 Be5 46. Nxf8 Bd6 47. Nd7 Bc7 48. Kxe7 Ba5 49. Ke8 Bc7 50. e7 Bf4 51.
Nf6+ gxf6 52. Kd7 Kg7 53. e8=Q Kh6 54. Ke6 Kg5 55. g7 Kg4 56. g8=Q+ Kh4 57.
Qh7+ Bh6 58. Qxh6+ Kg4 59. Qeh5# {#38/80}) 22... Kh8 23. Kf5 Kg8 24. Ke4 Kh8
25. Kd5 Kg8 26. Kc6 Kh8 27. Kd7 Kg8 28. Ke8 f5 29. Kd7 Kh8 30. Kc6 Kg8 31. Kd5
f4 32. Ke4 Bd2 33. Nb6 Bc1 34. Nc4 Be3 35. Kd5 Bc1 36. Kc6 Be3
37. Kd7 Bd4 38. Ke8 f3 39. Ncd2 Be5 40. Nxf3 Bf4 41. Kd8 Kh8
42. Kd7 Kg8 43. Ke8 Bg3 44. Ng5 Bd6 45. Nh7 Ba3 46. Nxf8 Bd6 47. Nh7 Bc5 48.
Ng5 Ba3 49. Nf7 Bb2 50. Nd8 Bc3 51. Nc6 Bb2 52. Nxe7+ Kh8 53. Kf7 Bc3 54. Nf5
Bb4 55. Nxg7 Be7 56. Nf5 Bf6 57. e7 Bxe7 58. g7+ Kh7 59. g8=Q# *

[/pgn]

All I can do.

Can't find any hole.
That the triangle maneuvre of the white King takes so many moves, that it seems even not to cost DTM to chase the black f- and h- pawn, was another one suprise to me. After the pawn march, Black has only choice between leaving alone f-Bishop with the King or leaving a5- field with Bishop thus setting white a8- Knight free.

Yet it's very hard to keep a mating score in hash backwarding the line, even with engines of lesser nullmove- pruning like Sting or Matefinder or others having option of disabling it.
Here's HekaStockfish with UCI option Find Mate after Backward to position after these 18 moves

N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1

1. Qxa1 Nb3+ 2. Kc4 Nxa1 3. Kc3 Bxa5+ 4. Kb2 Kg8 5. Kxa1 Kh8 6. Kb2 Kg8 7. Kb3
Kh8 8. Kc4 Kg8 9. Kc5 Kh8 10. Kd5 Kg8 11. Kc6 Kh8 12. Kd7 Kg8 13. Ke8 h5 14.
Kd7 Kh8 15. Kc6 Kg8 16. Kd5 Kh8 17. Ke4 Kg8 18. Kf4 Kh8

N4b1k/4p1p1/4PpP1/b6p/5K2/8/5p1p/5Nbr w - - 0 1

Analysis by HekaStockfishNNUE 280920:

19.Kg3 Bd8 20.Kh4 Kg8 21.Kxh5 Ba5 22.Kg4 Bd8 23.Kf5 Kh8 24.Ke4 Ba5 25.Kd5 Kg8 26.Kc6 Kh8 27.Kd7 Kg8 28.Ke8 f5 29.Kd7 Kh8 30.Kc6 Kg8 31.Kd5 Kh8 32.Ke5 Bc3+ 33.Kxf5 Bd4 34.Ke4 Bc5 35.Nc7 Bb4 36.Na6 Bc3 37.Kd5 Kg8 38.Kc6 Bd2 39.Kb7 Bc3 40.Nb8 Ba5 41.Nd7 Bb4 42.Kc7 Ba5+ 43.Kc8 Bc3 44.Kd8 Ba5+ 45.Ke8 Bc7 46.Nxf8 Ba5 47.Nh7 Bb4 48.Ng5 Bc3 49.Nf7 Be1 50.Nd8 Bb4 51.Nc6 Bd6 52.Nxe7+ Kh8 53.Nf5 Ba3 54.Kf7 Bb4 55.Nxg7 Be7 56.Nf5 Bf8 57.e7 Bh6 58.e8Q+ Bf8 59.Qxf8#
+- (#41) Depth: 107/82 00:01:07 2413MN

No change of output since 10 minutes, will let Backward run overnight onwards and see, if there's some more to be got.

[peter]

I think that Nb6 instead of Kc6 may be pivotal here (which, in itself, makes this position an exquisite problem):
[d]N4bk1/4p1p1/4PpPp/b1K5/8/8/5p1p/5Nbr w - - acd 50; bm Nb6; ce 1036; c3 "Kc6"; pm Nb6; pv Nb6 Bc3 Kc6 Bb2 Nd7 Be5 Kb7 Bc3 Kc7 Ba5+ Kc8 h5 Kb7 Bc3 Kc7 Ba5+ Kc8 h4 Kb7 Bd2 Kc7 Ba5+ Kc8 h3 Kb7 Bb4 Nb6 Bc5 Na4 Bd4 Kc6 Be5 Kd5 Bc7 Nc5 Be5 Ke4 Bd6 Nd7 f5+ Kxf5 Bg3 Kg4 Bd6 Kxh3 Bf4 Kh4; move 11a;

I have the white King at d5 after 10 moves of Hobacle's line, not at c5 like in your position, so 11.Nb6 wouldn't work, King cannot recapture.
And then I don't see how it works anyhow with exchange of free white Knight against free black Bishop. Black had thus only King left to capture Bishop at f8 which after march of pawns was stalemate.

[peter]

It looks like if white times it right, Ke8 and black is in Zugzwang.

So it is. Real problem is, before that works, white Knight at a8 has to be set free with cyclic zugzwang maneuvres of its own, because capturing Bishop f8 after single one free black Bishop is exchanged to soon against this one Knight, there are no more figures to move, if free black pawns at f- und h- line are blocked or taken. Capturing at f8 with white King then finally would end up stalemate. f8- Bishop has to be taken by the white Knight, not by the white King, when there are no more black figures left to move.
This one point having got, I just didn't see the way to set Knight at a8 free without exchanging it against a5- Bishop, shame on me.

After HekaStockfish with its Find Mate got stuck with mating score in Backward at move nr. 18, I changed to SF MOJO (Modification by Jörg Oster), a branch nullmove pruning can be switched off for.
With this one it worked back to 13th move:

N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1

1. Qxa1 Nb3+ 2. Kc4 Nxa1 3. Kc3 Bxa5+ 4. Kb2 Kg8 5. Kxa1 Kh8 6. Kb2 Kg8 7. Kb3
Kh8 8. Kc4 Kg8 9. Kc5 Kh8 10. Kd5 Kg8 11. Kc6 Kh8 12. Kd7 Kg8 13. Ke8 h5

[d]N3Kbk1/4p1p1/4PpP1/b6p/8/8/5p1p/5Nbr w - - 0 1
Analysis by Stockfish-MOJO 281120:
14.Kd7 Kh8 15.Kc6 h4 16.Kd5 Bd8 17.Ke4 Kg8 18.Kf4 h3 19.Kg3 Ba5 20.Kxh3 Bd8 21.Kg3 Ba5 22.Kf4 Kh8 23.Ke4 Kg8 24.Kd4 Bd8 25.Kc5 Ba5 26.Kc6 Kh8 27.Kd7 Kg8 28.Ke8 f5 29.Kd7 Kh8 30.Kc6 Kg8 31.Kd5 Kh8 32.Ke5 Bc3+ 33.Kxf5 Bd4 34.Ke4 Ba7 35.Nc7 Kg8 36.Na6 Kh8 37.Kd5 Kg8 38.Kc6 Bd4 39.Nb8 Be5 40.Nd7 Bd6 41.Nb6 Be5 42.Kb7 Bd4 43.Nd7 Bc3 44.Kb6 Kh8 45.Nxf8 Kg8 46.Nh7 Bb4 47.Kc7 Bd6+ 48.Kd7 Bb4
+- (#50) Depth: 68/71 00:01:01 2343MN

About 2 to 5 moves to much DTM, I guess (at the end of the output- line 13 missing, so 61 all in all, I'm not sure about Hobacle's 59, maybe there are a few to be spared yet still) but yet rather quick Backward, best engine for keeping mate score in hash so far at my trials with this one position. Classical eval was used, 12x3GHz Xeon X5670 CPU (SSE4.1 popcnt) 32G hash.

Over night mating score got lost, here's the output afterwards at starting position:

]N2b1b1k/4p1p1/4PpPp/B1K5/3Q4/8/3n1p1p/r4Nbr w - - 0 1

Analysis by Stockfish-MOJO 281120:

1.Qxa1 Nb3+ 2.Kb4 Nxa1 3.Kc3 Bxa5+ 4.Kb2 Bd2 5.Kxa1 Bc3+ 6.Kb1 Bd2 7.Nb6 Be3 8.Nd7 Bd2 9.Ka1 Bc1 10.Nb6 Bg5 11.Kb2 Bd2 12.Ka2 Kg8 13.Kb3 Ba5 14.Nd7 f5 15.Kc2 Bb4 16.Kb2 Ba5 17.Nb8 Kh8 18.Kc2 Bc7 19.Nd7 Bd6 20.Kb1 Ba3 21.Ka1 Bc1 22.Ka2 Bg5 23.Kb3 Kg8 24.Nb8 Kh8 25.Kb2 Bd2 26.Kc2 Ba5 27.Nd7 Bb4 28.Kb3 Ba5 29.Ka4 Bc7 30.Ka3 Bg3 31.Ka2 Bf4 32.Kb2 Bg3 33.Kc3 Bf4 34.Nb6 Be3 35.Na8 Ba7 36.Kb4 Bd4 37.Kb3 Be5 38.Kc4 Bb8 39.Kb5 Ba7 40.Nc7
+- (137.72) Depth: 76/80 00:10:41 14601MN

Pity progress to mate isn't really to be seen there.

Anyhow a very fine study of cyclic zugzwang and one of the best april 1st. jokes I ever fell for completely regards

[Hobacle]

So this puzzle is much more difficult than I thought.

I got a #59 by myself at first, then I tried to use some of my engines to verified my solution but they all failed to solve the puzzle. Then, I posted it here and...

[peter]

So this puzzle is much more difficult than I thought.

I got a #59 by myself at first, then I tried to use some of my engines to verified my solution but they all failed to solve the puzzle. Then, I posted it here and...

I shouldn't have doubted it from the very start to work at all, maybe if you wouldn't have posted it just on April 1st, who knows...

But if you once are convinced it's not correct, it's just not so easy to prove the opposite, as you said truly, for engines the long cyclic zugwang- problems get of of their search- horizon again and again.

Very fine piece indeed, thanks for it and Happy Easter!
And so to Each and Everyone!