Hard Puzzle for Christmas

[peter]

[fen]4n3/2p1b1pk/1pPp1pNp/3P1PP1/3P4/Np5P/bP6/3K4 w - - 0 1[/fen]

My personal final version.

Ok, so to start with Nf8 then and thus come into old ways. BTW, LC0 finds that too, of course not with DTM- score, regards

[peter]

BTW, LC0 finds that too, of course not with DTM- score

As for that, probably something about 70 moves.
After these first 10

4n3/2p1b1pk/1pPp1pNp/3P1PP1/3P4/Np5P/bP6/3K4 w - -

1. Nf8+ Kg8 2. g6 Bxf8 3. Kc1 Be7 4. Nb1 Bd8 5. Nd2 Kf8 6. Kd1 Kg8 7. Ke2 Kf8 8. Kd3 Be7 9. Kc4 Kg8

4n1k1/2p1b1p1/1pPp1pPp/3P1P2/2KP4/1p5P/bP1N4/8 w - -

Engine: SlowChess Blitz 2.9 avx20 (32768 MB)
von Jonathan Kreuzer

86/127 1:49 +M63 10.h4 Lf8 11.Kb5 Le7 12.Ka6 Kf8
13.Kb7 Ld8 14.Kc8 Le7 15.Kd7 h5
16.Kc8 Kg8 17.Kb7 Kf8 18.Ka7 Ld8
19.Ka6 Kg8 20.Kb5 Kf8 21.Kc4 Le7
22.Kd3 Ld8 23.Ke2 (2.486.979.003) 22697

[Hobacle]

I'd really like to be a person who knows what "final" means.

Here're two new ideas on how to improve the original study:

[pgn]
[Date "2023.02.06"]
[Result "1-0"]
[FEN "4n3/2p1b1p1/1pPpkp2/3p2P1/3P1PP1/Np2K3/bP6/8 w - - 0 1"]
[SetUp "1"]

1. f5+ Kf7 2. g6+ Kg8 3. Kd2 Kf8 4. Kc1 Kg8 5. Nb5 Kf8 6. Nc3 Kg8 7. Nd1 Kf8 8. Ne3 Kg8 9. Nf1 Kf8 10. Nd2 Kg8 11. Kd1 Kf8 12. Ke2 Kg8 13. Kd3 Kf8 14. Kc3 Kg8 15. Kb4 Kf8 16. Kb5 Kg8 17. Ka6 Kf8 18. Kb7 Bd8 19. Kb8 Be7 20. Kc8 Kg8 21. Kd7 Kf8 22. Nf3 Bb1 23. Ng1 Bd3 24. Nh3 Be2 25. Nf4 Bxg4 26. Ne6+ $18 1-0
[/pgn]

[pgn]
[Date "2023.02.07"]
[Result "1-0"]
[FEN "4nk2/2p1b1p1/1pPp1pPp/3P1Pp1/3PK3/Np6/bP3P1P/8 w - - 0 1"]
[SetUp "1"]

1. Kd3 Kg8 2. Kd2 Kf8 3. Kc1 Kg8 4. Nb1 Kf8 5. Nd2 Kg8 6. Kd1 Kf8 7. Ke2 Kg8 8.
Kd3 Kf8 9. Kc4 Kg8 10. Kb5 Kf8 11. Ka6 Kg8 12. Kb7 Kf8 13. Kb8 Bd8 14. Kc8 Ke7
15. f3 (15. h3 $2 15... h5 16. f3 h4 $11) 15... h5 16. Kb7 Kf8 17. Ka6 Ke7 18.
Kb5 Kf8 19. Kc4 Ke7 20. Kd3 Kf8 21. Ke2 Ke7 22. Kd1 Kf8 23. Kc1 Ke7 24. Nf1 Kf8
25. Ng3 h4 26. Nf1 Ke7 27. Nd2 Kf8 28. Kd1 Ke7 29. Ke2 Kf8 30. Kd3 Ke7 31. Kc4
Kf8 32. Kb5 Ke7 33. Ka6 Kf8 34. Kb7 Ke7 (34... Be7 $6 35. Kc8 Kg8 36. Kd7 Kf8
37. h3 b5 38. Kc8 $18) 35. Kc8 h3 36. Kb7 Kf8 37. Ka6 Ke7 38. Kb5 Kf8 39. Kc4
Ke7 40. Kd3 Kf8 41. Ke3 Ke7 42. Kf2 Kf8 43. Kg3 Ke7 44. Kxh3 Kf8 45. Kg3 Ke7
46. Kf2 Kf8 47. Ke3 Ke7 48. Kd3 Kf8 49. Kc4 Ke7 50. Kb5 Kf8 51. Ka6 Ke7 52. Kb7
Kf8 53. Kc8 Ke7 54. h3 b5 55. Kb7 Kf8 56. Ka6 b4 57. Kb5 Ke7 58. Kxb4 Kf8 59.
Kc3 Ke7 60. Kd3 Kf8 61. Ke2 Ke7 62. Kd1 Kf8 63. Kc1 Ke7 64. Nb1 Kf8 65. Nc3 Ke7
66. Kd2 Kf8 67. Kd3 Ke7 68. Kc4 Kf8 69. Kb4 Ke7 70. Ka3 Kf8 71. Nxa2 bxa2 72.
Kxa2 g4 73. hxg4 Be7 74. Kb3 Bd8 75. Ka4 Kg8 76. Kb5 Be7 77. Ka6 Bd8 78. Kb7
Kh8 79. Kc8 Be7 80. Kd7 Bf8 81. Kxe8 Kg8 82. Kd7 Kh8 83. Kxc7 Be7 84. Kd7 Bd8
85. Kxd8 Kg8 86. Ke7 Kh8 87. c7 Kg8 88. c8=Q# 1-0
[/pgn]