White to move and force mate in 81

[acase]

The thread's title is self explanatory here:

[pgn][Event "?"]
[Site "#81"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - - 0 1"]
[Termination "normal"]
[PlyCount "161"]
[WhiteType "program"]
[BlackType "program"]
[/pgn]


let me know which engines get this, thank you.

[peter]

The thread's title is self explanatory here:

[pgn][Event "?"]
[Site "#81"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - - 0 1"]
[Termination "normal"]
[PlyCount "161"]
[WhiteType "program"]
[BlackType "program"]
[/pgn]
let me know which engines get this

SF11 manages to keep a probably not quite wrong line in hash and output after Backward of interactive trying together with HekaStockfish and SlowChess
DTM yet gets lost again and again at further Backward than to position after first 2 moves:

1. Ke2 Kc2 2. Bg2 Kc1

8/1p1p2p1/5p1p/5P1P/1p1p1P2/pP1P1P2/P3K1B1/2k5 w - - 0 1

Analysis by Stockfish 11 64 POPCNT:

3.Bh3 Kc2 4.Bf1 Kc1 5.Ke1 Kc2 6.Be2 Kc1 7.Bd1 Kb2 8.Kd2 Kb1 9.Bc2+ Kb2 10.Kd1 Ka1 11.Kc1 Kxa2 12.Bd1 Ka1 13.Kc2 Ka2 14.Be2 Ka1 15.Bf1 Ka2 16.Bg2 Ka1 17.Bh3 Ka2 18.Bf1 Ka1 19.Be2 Ka2 20.Bd1 Ka1 21.Kc1 Ka2 22.Bc2 Ka1 23.Bb1 b6 24.Bc2 Ka2 25.Bd1 Ka1 26.Kc2 Ka2 27.Be2 Ka1 28.Bf1 Ka2 29.Bg2 Ka1 30.Bh3 Ka2 31.Bf1 Ka1 32.Be2 Ka2 33.Bd1 Ka1 34.Kc1 Ka2 35.Bc2 Ka1 36.Bb1 d6 37.Bc2 Ka2 38.Bd1 Ka1 39.Be2 Ka2 40.Kc2 Ka1 41.Bf1 Ka2
+- (#79) Depth: 77/78 00:03:02 17082MN

Stopped for now having to leave, probably after longer waiting the 32G hash with 30 threads of 16x3.5GH yet will be enough to get a full DTM- line from very starting position too, regards

[peter]

After Forward- Backward again:

8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - -

Engine: ShashChess 33.10 (32768 MB)
von K. Kiniama, A. Manzo and Stockfish deve


75/77 0:01 +M81 1.Ke2 Kc2 2.Lg2 Kc3 3.Lh3 Kc2 4.Lf1 Kc1
5.Ke1 Kc2 6.Le2 Kc3 7.Kd1 Kb2 8.Kd2 Kb1
9.Ld1 Kb2 10.Lc2 Ka1 11.Kc1 Kxa2
12.Ld1 Ka1 13.Kc2 Ka2 14.Le2 (186.155.053) 97514

Full line of ShashChess' output, pasted to GUI part by part:

[pgn]
[Event "?"]
[Site "?"]
[Date "2023.07.04"]
[Round "?"]
[White "#81"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - -"]

1. Ke2 Kc2 2. Bg2 Kc3 3. Bh3 Kc2 4. Bf1 Kc1 5. Ke1 Kc2
6. Be2 Kc3 7. Kd1 Kb2 8. Kd2 Kb1 9. Bd1 Kb2 10. Bc2 Ka1
11. Kc1 Kxa2 12. Bd1 Ka1 13. Kc2 Ka2 14. Be2 Ka1 15. Bf1
Ka2 16. Bh3 Ka1 17. Bg2 Ka2 18. Bf1 Ka1 19. Be2 Ka2 20. Bd1
Ka1 21. Kc1 Ka2 22. Bc2 Ka1 23. Bb1 d6 24. Bc2 Ka2 25. Bd1
Ka1 26. Kc2 Ka2 27. Be2 Ka1 28. Bf1 Ka2 29. Bh3 Ka1 30. Bg2
Ka2 31. Bf1 Ka1 32. Be2 Ka2 33. Bd1 Ka1 34. Kc1 Ka2 35. Bc2
Ka1 36. Bb1 b6 37. Bc2 Ka2 38. Bd1 Ka1 39. Kc2 Ka2 40. Be2
Ka1 41. Bf1 Ka2 42. Bh3 Ka1 43. Bg2 Ka2 44. Bf1 Ka1 45. Be2
Ka2 46. Bd1 Ka1 47. Kc1 Ka2 48. Bc2 Ka1 49. Bb1 d5 50. Bc2
Ka2 51. Bd1 Ka1 52. Kc2 Ka2 53. Be2 Ka1 54. Bf1 Ka2 55. Bg2
Ka1 56. Bh3 Ka2 57. Bf1 Ka1 58. Be2 Ka2 59. Bd1 Ka1 60. Kc1
Ka2 61. Bc2 Ka1 62. Bb1 b5 63. Bc2 Ka2 64. Bd1 Ka1 65. Kc2
Ka2 66. Be2 Ka1 67. Bf1 Ka2 68. Bh3 Ka1 69. Bg2 Ka2 70. Bf1
Ka1 71. Be2 Ka2 72. Bd1 Ka1 73. Kc1 Ka2 74. Bc2 Ka1 75. Bb1
g5 76. fxg6 a2 77. Bxa2 Kxa2 78. Kc2 Ka3 79. g7 Ka2
80. g8=Q Ka1 81. Qa8# *
[/pgn]

[peter]

Gustav(4.1d) is great here:

1.Kd1-e2 Kc3-c2 2.Lh1-g2 Kc2-c1 3.Lg2-h3 Kc1-c2 4.Lh3-f1 Kc2-c1 5.Ke2-e1 Kc1-b2 6.Ke1-d2 Kb2-b1 7.Lf1-e2 Kb1-b2 8.Le2-d1 Kb2-b1 9.Ld1-c2 Kb1-b2 10.Kd2-d1 Kb2-a1 11.Kd1-c1 Ka1-a2 12.Lc2-d1 Ka2-a1 13.Ld1-e2 Ka1-a2 14.Kc1-c2 Ka2-a1 15.Le2-f1 Ka1-a2 16.Lf1-h3 Ka2-a1 17.Lh3-g2 Ka1-a2 18.Lg2-f1 Ka2-a1 19.Lf1-e2 Ka1-a2 20.Le2-d1 Ka2-a1 21.Kc2-c1 Ka1-a2 22.Ld1-c2 Ka2-a1 23.Lc2-b1 Bb7-b6 24.Lb1-c2 Ka1-a2 25.Lc2-d1 Ka2-a1 26.Ld1-e2 Ka1-a2 27.Kc1-c2 Ka2-a1 28.Le2-f1 Ka1-a2 29.Lf1-h3 Ka2-a1 30.Lh3-g2 Ka1-a2 31.Lg2-f1 Ka2-a1 32.Lf1-e2 Ka1-a2 33.Le2-d1 Ka2-a1 34.Kc2-c1 Ka1-a2 35.Ld1-c2 Ka2-a1 36.Lc2-b1 Bb6-b5 37.Lb1-c2 Ka1-a2 38.Lc2-d1 Ka2-a1 39.Ld1-e2 Ka1-a2 40.Kc1-c2 Ka2-a1 41.Le2-f1 Ka1-a2 42.Lf1-h3 Ka2-a1 43.Lh3-g2 Ka1-a2 44.Lg2-f1 Ka2-a1 45.Lf1-e2 Ka1-a2 46.Le2-d1 Ka2-a1 47.Kc2-c1 Ka1-a2 48.Ld1-c2 Ka2-a1 49.Lc2-b1 Bd7-d6 50.Lb1-c2 Ka1-a2 51.Lc2-d1 Ka2-a1 52.Ld1-e2 Ka1-a2 53.Kc1-c2 Ka2-a1 54.Le2-f1 Ka1-a2 55.Lf1-h3 Ka2-a1 56.Lh3-g2 Ka1-a2 57.Lg2-f1 Ka2-a1 58.Lf1-e2 Ka1-a2 59.Le2-d1 Ka2-a1 60.Kc2-c1 Ka1-a2 61.Ld1-c2 Ka2-a1 62.Lc2-b1 Bd6-d5 63.Lb1-c2 Ka1-a2 64.Lc2-d1 Ka2-a1 65.Ld1-e2 Ka1-a2 66.Kc1-c2 Ka2-a1 67.Le2-f1 Ka1-a2 68.Lf1-h3 Ka2-a1 69.Lh3-g2 Ka1-a2 70.Lg2-f1 Ka2-a1 71.Lf1-e2 Ka1-a2 72.Le2-d1 Ka2-a1 73.Kc2-c1 Ka1-a2 74.Ld1-c2 Ka2-a1 75.Lc2-b1 Ba3-a2 76.Lb1-c2 Bg7-g5 77.Bh5-g6 Bh6-h5 78.Bg6-g7 Bh5-h4 79.g7-g8D Bh4-h3 80.Dg8-d5 Bh3-h2 81.Dd5-d4#

Automatic parameters, solution found in 44.26 sec., "Fluchtfelder 4".
Giving the already known param of 4 fields only for the Black King at new start, time to solution is even shorter for the half of it, about 20" only then

[Ajedrecista]

Hello:

The thread's title is self explanatory here:

[pgn][Event "?"]
[Site "#81"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - - 0 1"]
[Termination "normal"]
[PlyCount "161"]
[WhiteType "program"]
[BlackType "program"]
[/pgn]


let me know which engines get this, thank you.

This is a similar problem to two by Karl Faber: YACPDB #191186 (also PDB P1299270) and YACPDB #191941. The first one has been posted several times at TalkChess.

I have tried this problem with Chest 5.2 without success. There must have been good parameters that solve the problem in a blink, though I have not found them. Congratulations to Peter and his analysis with Gustav.

Regards from Spain.

Ajedrecista.

[peter]

This is a similar problem to two by Karl Faber: YACPDB #191186 (also PDB P1299270) and YACPDB #191941.

Thanks for finding that, I had the first one stored on my disk already even, but didn't realize at first sight, shame on me.
With the Fabel's #82 Gustav is about as fast as with the changed position, regards

[towforce]

After Forward- Backward again:

8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - -

Engine: ShashChess 33.10 (32768 MB)
von K. Kiniama, A. Manzo and Stockfish deve


75/77 0:01 +M81 1.Ke2 Kc2 2.Lg2 Kc3 3.Lh3 Kc2 4.Lf1 Kc1
5.Ke1 Kc2 6.Le2 Kc3 7.Kd1 Kb2 8.Kd2 Kb1
9.Ld1 Kb2 10.Lc2 Ka1 11.Kc1 Kxa2
12.Ld1 Ka1 13.Kc2 Ka2 14.Le2 (186.155.053) 97514

Full line of ShashChess' output, pasted to GUI part by part:

[pgn]
[Event "?"]
[Site "?"]
[Date "2023.07.04"]
[Round "?"]
[White "#81"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - -"]

1. Ke2 Kc2 2. Bg2 Kc3 3. Bh3 Kc2 4. Bf1 Kc1 5. Ke1 Kc2
6. Be2 Kc3 7. Kd1 Kb2 8. Kd2 Kb1 9. Bd1 Kb2 10. Bc2 Ka1
11. Kc1 Kxa2 12. Bd1 Ka1 13. Kc2 Ka2 14. Be2 Ka1 15. Bf1
Ka2 16. Bh3 Ka1 17. Bg2 Ka2 18. Bf1 Ka1 19. Be2 Ka2 20. Bd1
Ka1 21. Kc1 Ka2 22. Bc2 Ka1 23. Bb1 d6 24. Bc2 Ka2 25. Bd1
Ka1 26. Kc2 Ka2 27. Be2 Ka1 28. Bf1 Ka2 29. Bh3 Ka1 30. Bg2
Ka2 31. Bf1 Ka1 32. Be2 Ka2 33. Bd1 Ka1 34. Kc1 Ka2 35. Bc2
Ka1 36. Bb1 b6 37. Bc2 Ka2 38. Bd1 Ka1 39. Kc2 Ka2 40. Be2
Ka1 41. Bf1 Ka2 42. Bh3 Ka1 43. Bg2 Ka2 44. Bf1 Ka1 45. Be2
Ka2 46. Bd1 Ka1 47. Kc1 Ka2 48. Bc2 Ka1 49. Bb1 d5 50. Bc2
Ka2 51. Bd1 Ka1 52. Kc2 Ka2 53. Be2 Ka1 54. Bf1 Ka2 55. Bg2
Ka1 56. Bh3 Ka2 57. Bf1 Ka1 58. Be2 Ka2 59. Bd1 Ka1 60. Kc1
Ka2 61. Bc2 Ka1 62. Bb1 b5 63. Bc2 Ka2 64. Bd1 Ka1 65. Kc2
Ka2 66. Be2 Ka1 67. Bf1 Ka2 68. Bh3 Ka1 69. Bg2 Ka2 70. Bf1
Ka1 71. Be2 Ka2 72. Bd1 Ka1 73. Kc1 Ka2 74. Bc2 Ka1 75. Bb1
g5 76. fxg6 a2 77. Bxa2 Kxa2 78. Kc2 Ka3 79. g7 Ka2
80. g8=Q Ka1 81. Qa8# *
[/pgn]

Very impressive for a computer to find that!

[peter]

Very impressive for a computer to find that!

Well, yes, but just to be sure, you noticed the first two postings of mine gave output after Forward- Backward of interactively built lines, didn't you?
Really impressive I find Gustav's performance to solve that in 20 sec. with parameter Fluchtfelder 4 (not quite the same as KingSquares in Chest but about that) and even better to me the 40 sec. with automatic parameters.
BTW I had seen Gustav's superiority in the original study from Karl Fabel, when I stored it on disk quite a while ago but didn't remember at once:
Orginal study from Jesus' first YACPD- link:

[fen]8/1p1p2p1/5p1p/5P1P/1p1p1P2/pP1P1P2/P1k1B3/4K3 w - -[/fen]

1.Le2-f1 Kc2-c1 2.Lf1-h3 Kc1-c2 3.Ke1-e2 Kc2-c1 4.Lh3-g2 Kc1-c2 5.Lg2-f1 Kc2-c1 6.Ke2-e1 Kc1-b2 7.Ke1-d2 Kb2-b1 8.Lf1-e2 Kb1-b2 9.Le2-d1 Kb2-b1 10.Ld1-c2 Kb1-b2 11.Kd2-d1 Kb2-a1 12.Kd1-c1 Ka1-a2 13.Lc2-d1 Ka2-a1 14.Ld1-e2 Ka1-a2 15.Kc1-c2 Ka2-a1 16.Le2-f1 Ka1-a2 17.Lf1-h3 Ka2-a1 18.Lh3-g2 Ka1-a2 19.Lg2-f1 Ka2-a1 20.Lf1-e2 Ka1-a2 21.Le2-d1 Ka2-a1 22.Kc2-c1 Ka1-a2 23.Ld1-c2 Ka2-a1 24.Lc2-b1 Bb7-b6 25.Lb1-c2 Ka1-a2 26.Lc2-d1 Ka2-a1 27.Ld1-e2 Ka1-a2 28.Kc1-c2 Ka2-a1 29.Le2-f1 Ka1-a2 30.Lf1-h3 Ka2-a1 31.Lh3-g2 Ka1-a2 32.Lg2-f1 Ka2-a1 33.Lf1-e2 Ka1-a2 34.Le2-d1 Ka2-a1 35.Kc2-c1 Ka1-a2 36.Ld1-c2 Ka2-a1 37.Lc2-b1 Bb6-b5 38.Lb1-c2 Ka1-a2 39.Lc2-d1 Ka2-a1 40.Ld1-e2 Ka1-a2 41.Kc1-c2 Ka2-a1 42.Le2-f1 Ka1-a2 43.Lf1-h3 Ka2-a1 44.Lh3-g2 Ka1-a2 45.Lg2-f1 Ka2-a1 46.Lf1-e2 Ka1-a2 47.Le2-d1 Ka2-a1 48.Kc2-c1 Ka1-a2 49.Ld1-c2 Ka2-a1 50.Lc2-b1 Bd7-d6 51.Lb1-c2 Ka1-a2 52.Lc2-d1 Ka2-a1 53.Ld1-e2 Ka1-a2 54.Kc1-c2 Ka2-a1 55.Le2-f1 Ka1-a2 56.Lf1-h3 Ka2-a1 57.Lh3-g2 Ka1-a2 58.Lg2-f1 Ka2-a1 59.Lf1-e2 Ka1-a2 60.Le2-d1 Ka2-a1 61.Kc2-c1 Ka1-a2 62.Ld1-c2 Ka2-a1 63.Lc2-b1 Bd6-d5 64.Lb1-c2 Ka1-a2 65.Lc2-d1 Ka2-a1 66.Ld1-e2 Ka1-a2 67.Kc1-c2 Ka2-a1 68.Le2-f1 Ka1-a2 69.Lf1-h3 Ka2-a1 70.Lh3-g2 Ka1-a2 71.Lg2-f1 Ka2-a1 72.Lf1-e2 Ka1-a2 73.Le2-d1 Ka2-a1 74.Kc2-c1 Ka1-a2 75.Ld1-c2 Ka2-a1 76.Lc2-b1 Ba3-a2 77.Lb1-c2 Bg7-g5 78.Bh5-g6 Bh6-h5 79.Bg6-g7 Bh5-h4 80.g7-g8D Bh4-h3 81.Dg8-d5 Bh3-h2 82.Dd5-d4#

Fluchtfelder 4: 20.82 seconds to solution, regards

[acase]

Hello:

The thread's title is self explanatory here:

[pgn][Event "?"]
[Site "#81"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pPkP1P2/P7/3K3B w - - 0 1"]
[Termination "normal"]
[PlyCount "161"]
[WhiteType "program"]
[BlackType "program"]
[/pgn]


let me know which engines get this, thank you.

This is a similar problem to two by Karl Faber: YACPDB #191186 (also PDB P1299270) and YACPDB #191941. The first one has been posted several times at TalkChess.

I have tried this problem with Chest 5.2 without success. There must have been good parameters that solve the problem in a blink, though I have not found them. Congratulations to Peter and his analysis with Gustav.

Regards from Spain.

Ajedrecista.

Hello Jesus, I KNEW you would recognize it, I extended the moves by 10 moves because it was easy to do. If you let Chest look at the position AFTER Black's 10th move in "AutoTurbo" mode it will solve it instantly, but you are absolutely correct that it was based on Fabel's problem (the first one you posted, I was unaware of the second one) which is in the Chest database as a mate in 71.

Here is the similar position in Chest's database:

[pgn][Event "Mate in 71"]
[Site "Columbus, Ohio"]
[Date "2023.07.04"]
[Round "?"]
[White "ChestUCI"]
[Black "?"]
[Result "1-0"]
[Time "16:20:56"]
[WhiteElo "2000"]
[TimeControl "0"]
[SetUp "1"]
[FEN "8/1p1p2p1/5p1p/5P1P/1p1p1P2/pP1P1P2/P1BK4/k7 w - - 0 1"]
[Termination "normal"]
[PlyCount "141"]
[WhiteType "program"]
[BlackType "program"]

1. Kc1 {+M71/71 1 ChestUCI} Kxa2 2. Bd1 Ka1 3. Be2 Ka2 4. Kc2 Ka1 5. Bf1
Ka2 6. Bg2 Ka1 7. Bh3 Ka2 8. Bf1 Ka1 9. Be2 Ka2 10. Bd1 Ka1 11. Kc1 Ka2 12.
Bc2 Ka1 13. Bb1 d6 14. Bc2 Ka2 15. Bd1 Ka1 16. Be2 Ka2 17. Kc2 Ka1 18. Bf1
Ka2 19. Bg2 Ka1 20. Bh3 Ka2 21. Bf1 Ka1 22. Be2 Ka2 23. Bd1 Ka1 24. Kc1 Ka2
25. Bc2 Ka1 26. Bb1 d5 27. Bc2 Ka2 28. Bd1 Ka1 29. Be2 Ka2 30. Kc2 Ka1 31.
Bf1 Ka2 32. Bg2 Ka1 33. Bh3 Ka2 34. Bf1 Ka1 35. Be2 Ka2 36. Bd1 Ka1 37. Kc1
Ka2 38. Bc2 Ka1 39. Bb1 b6 40. Bc2 Ka2 41. Bd1 Ka1 42. Be2 Ka2 43. Kc2 Ka1
44. Bf1 Ka2 45. Bg2 Ka1 46. Bh3 Ka2 47. Bf1 Ka1 48. Be2 Ka2 49. Bd1 Ka1 50.
Kc1 Ka2 51. Bc2 Ka1 52. Bb1 b5 53. Bc2 Ka2 54. Bd1 Ka1 55. Be2 Ka2 56. Kc2
Ka1 57. Bf1 Ka2 58. Bg2 Ka1 59. Bh3 Ka2 60. Bf1 Ka1 61. Be2 Ka2 62. Bd1 Ka1
63. Kc1 Ka2 64. Bc2 Ka1 65. Bb1 g6 66. hxg6 h5 67. g7 a2 68. Bc2 h4 69.
g8=Q h3 70. Qg1 h2 71. Qxd4# 1-0
[/pgn]

[acase]

Gustav(4.1d) is great here:

1.Kd1-e2 Kc3-c2 2.Lh1-g2 Kc2-c1 3.Lg2-h3 Kc1-c2 4.Lh3-f1 Kc2-c1 5.Ke2-e1 Kc1-b2 6.Ke1-d2 Kb2-b1 7.Lf1-e2 Kb1-b2 8.Le2-d1 Kb2-b1 9.Ld1-c2 Kb1-b2 10.Kd2-d1 Kb2-a1 11.Kd1-c1 Ka1-a2 12.Lc2-d1 Ka2-a1 13.Ld1-e2 Ka1-a2 14.Kc1-c2 Ka2-a1 15.Le2-f1 Ka1-a2 16.Lf1-h3 Ka2-a1 17.Lh3-g2 Ka1-a2 18.Lg2-f1 Ka2-a1 19.Lf1-e2 Ka1-a2 20.Le2-d1 Ka2-a1 21.Kc2-c1 Ka1-a2 22.Ld1-c2 Ka2-a1 23.Lc2-b1 Bb7-b6 24.Lb1-c2 Ka1-a2 25.Lc2-d1 Ka2-a1 26.Ld1-e2 Ka1-a2 27.Kc1-c2 Ka2-a1 28.Le2-f1 Ka1-a2 29.Lf1-h3 Ka2-a1 30.Lh3-g2 Ka1-a2 31.Lg2-f1 Ka2-a1 32.Lf1-e2 Ka1-a2 33.Le2-d1 Ka2-a1 34.Kc2-c1 Ka1-a2 35.Ld1-c2 Ka2-a1 36.Lc2-b1 Bb6-b5 37.Lb1-c2 Ka1-a2 38.Lc2-d1 Ka2-a1 39.Ld1-e2 Ka1-a2 40.Kc1-c2 Ka2-a1 41.Le2-f1 Ka1-a2 42.Lf1-h3 Ka2-a1 43.Lh3-g2 Ka1-a2 44.Lg2-f1 Ka2-a1 45.Lf1-e2 Ka1-a2 46.Le2-d1 Ka2-a1 47.Kc2-c1 Ka1-a2 48.Ld1-c2 Ka2-a1 49.Lc2-b1 Bd7-d6 50.Lb1-c2 Ka1-a2 51.Lc2-d1 Ka2-a1 52.Ld1-e2 Ka1-a2 53.Kc1-c2 Ka2-a1 54.Le2-f1 Ka1-a2 55.Lf1-h3 Ka2-a1 56.Lh3-g2 Ka1-a2 57.Lg2-f1 Ka2-a1 58.Lf1-e2 Ka1-a2 59.Le2-d1 Ka2-a1 60.Kc2-c1 Ka1-a2 61.Ld1-c2 Ka2-a1 62.Lc2-b1 Bd6-d5 63.Lb1-c2 Ka1-a2 64.Lc2-d1 Ka2-a1 65.Ld1-e2 Ka1-a2 66.Kc1-c2 Ka2-a1 67.Le2-f1 Ka1-a2 68.Lf1-h3 Ka2-a1 69.Lh3-g2 Ka1-a2 70.Lg2-f1 Ka2-a1 71.Lf1-e2 Ka1-a2 72.Le2-d1 Ka2-a1 73.Kc2-c1 Ka1-a2 74.Ld1-c2 Ka2-a1 75.Lc2-b1 Ba3-a2 76.Lb1-c2 Bg7-g5 77.Bh5-g6 Bh6-h5 78.Bg6-g7 Bh5-h4 79.g7-g8D Bh4-h3 80.Dg8-d5 Bh3-h2 81.Dd5-d4#

Automatic parameters, solution found in 44.26 sec., "Fluchtfelder 4".
Giving the already known param of 4 fields only for the Black King at new start, time to solution is even shorter for the half of it, about 20" only then

Gustav is indeed Impressive here Peter, thanks for trying it out.