Huge work... But it will be done certainly!

[Hobacle]

I was stupid...

[Spliffjiffer]

I was stupid...

...my solution was this one:

[pgn]
[Event "Computer Schach Partie"]
[Site "DESKTOP-F6DA4QS"]
[Date "2022.09.27"]
[Round "?"]
[White "Corchess2_x64_avx2"]
[Black "ChestUCI"]
[Result "*"]
[BlackElo "2000"]
[Time "12:15:57"]
[WhiteElo "2000"]
[SetUp "1"]
[FEN "1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "375"]
[WhiteType "human"]
[BlackType "human"]

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7.
Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13.
Kb2 c4 14. Ka3 Kf3 15. Qe3+ Kg2 16. Qg1+ Kf3 17. Qf1+ Kg4 18. Qe2+ Rf3 19.
Qe6+ Rf5 20. Kxa4 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3
25. Qe6+ Rf5 26. Ka3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+
Rf3 31. Qe6+ Rf5 32. Kb2 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36.
Qe2+ Rf3 37. Qe6+ Rf5 38. Kc1 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4
42. Qe2+ Rf3 43. Qe6+ Rf5 44. Kd1 a4 45. Kc1 Kf3 46. Qe3+ Kg2 47. Qg1+ Kf3
48. Qf1+ Kg4 49. Qe2+ Rf3 50. Qe6+ Rf5 51. Kb2 Kf3 52. Qe3+ Kg2 53. Qg1+
Kf3 54. Qf1+ Kg4 55. Qe2+ Rf3 56. Qe6+ Rf5 57. Ka3 Kf3 58. Qe3+ Kg2 59.
Qg1+ Kf3 60. Qf1+ Kg4 61. Qe2+ Rf3 62. Qe6+ Rf5 63. Kxa4 Kf3 64. Qe3+ Kg2
65. Qg1+ Kf3 66. Qf1+ Kg4 67. Qe2+ Rf3 68. Qe6+ Rf5 69. Ka3 Kf3 70. Qe3+
Kg2 71. Qg1+ Kf3 72. Qf1+ Kg4 73. Qe2+ Rf3 74. Qe6+ Rf5 75. Kb2 Kf3 76.
Qe3+ Kg2 77. Qg1+ Kf3 78. Qf1+ Kg4 79. Qe2+ Rf3 80. Qe6+ Rf5 81. Kc1 a5 82.
Kd1 a4 83. Kc1 Kf3 84. Qe3+ Kg2 85. Qg1+ Kf3 86. Qf1+ Kg4 87. Qe2+ Rf3 88.
Qe6+ Rf5 89. Kd1 a6 90. Kc1 Kf3 91. Qe3+ Kg2 92. Qg1+ Kf3 93. Qf1+ Kg4 94.
Qe2+ Rf3 95. Qe6+ Rf5 96. Kd1 a5 97. Kc1 Kf3 98. Qe3+ Kg2 99. Qg1+ Kf3 100.
Qf1+ Kg4 101. Qe2+ Rf3 102. Qe6+ Rf5 103. Kd1 a3 104. Kc1 Kf3 105. Qe3+ Kg2
106. Qg1+ Kf3 107. Qf1+ Kg4 108. Qe2+ Rf3 109. Qe6+ Rf5 110. Kb1 Kf3 111.
Qe3+ Kg2 112. Qg1+ Kf3 113. Qf1+ Kg4 114. Qe2+ Rf3 115. Qe6+ Rf5 116. Ka2
Kf3 117. Qe3+ Kg2 118. Qg1+ Kf3 119. Qf1+ Kg4 120. Qe2+ Rf3 121. Qe6+ Rf5
122. Kxa3 Kf3 123. Qe3+ Kg2 124. Qg1+ Kf3 125. Qf1+ Kg4 126. Qe2+ Rf3 127.
Qe6+ Rf5 128. Kb2 Kf3 129. Qe3+ Kg2 130. Qg1+ Kf3 131. Qf1+ Kg4 132. Qe2+
Rf3 133. Qe6+ Rf5 134. Kc1 Kf3 135. Qe3+ Kg2 136. Qg1+ Kf3 137. Qf1+ Kg4
138. Qe2+ Rf3 139. Qe6+ Rf5 140. Kd1 a4 141. Kc1 Kf3 142. Qe3+ Kg2 143.
Qg1+ Kf3 144. Qf1+ Kg4 145. Qe2+ Rf3 146. Qe6+ Rf5 147. Kd1 a3 148. Kc1 Kf3
149. Qe3+ Kg2 150. Qg1+ Kf3 151. Qf1+ Kg4 152. Qe2+ Rf3 153. Qe6+ Rf5 154.
Kb1 Kf3 155. Qe3+ Kg2 156. Qg1+ Kf3 157. Qf1+ Kg4 158. Qe2+ Rf3 159. Qe6+
Rf5 160. Ka2 Kf3 161. Qe3+ Kg2 162. Qg1+ Kf3 163. Qf1+ Kg4 164. Qe2+ Rf3
165. Qe6+ Rf5 166. Kxa3 Kf3 167. Qe3+ Kg2 168. Qg1+ Kf3 169. Qf1+ Kg4 170.
Qe2+ Rf3 171. Qe6+ Rf5 172. Kb2 Kf3 173. Qe3+ Kg2 174. Qg1+ Kf3 175. Qf1+
Ke4 176. Qxc4+ Kf3 177. Qf1+ Kg4 178. Qe2+ Rf3 179. Qe6+ Rf5 180. Kc1 Kf3
181. Qe3+ Kg2 182. Qg1+ Kf3 183. Qf1+ Kg4 184. Qe2+ Rf3 185. Qe6+ Rf5 186.
Kd1 Nhf8 187. Nf6+ Kf3 188. Qe2# *

[/pgn]

[Hobacle]

I was stupid...

...my solution was this one:

[pgn]
[Event "Computer Schach Partie"]
[Site "DESKTOP-F6DA4QS"]
[Date "2022.09.27"]
[Round "?"]
[White "Corchess2_x64_avx2"]
[Black "ChestUCI"]
[Result "*"]
[BlackElo "2000"]
[Time "12:15:57"]
[WhiteElo "2000"]
[SetUp "1"]
[FEN "1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "375"]
[WhiteType "human"]
[BlackType "human"]

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7.
Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13.
Kb2 c4 14. Ka3 Kf3 15. Qe3+ Kg2 16. Qg1+ Kf3 17. Qf1+ Kg4 18. Qe2+ Rf3 19.
Qe6+ Rf5 20. Kxa4 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3
25. Qe6+ Rf5 26. Ka3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+
Rf3 31. Qe6+ Rf5 32. Kb2 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36.
Qe2+ Rf3 37. Qe6+ Rf5 38. Kc1 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4
42. Qe2+ Rf3 43. Qe6+ Rf5 44. Kd1 a4 45. Kc1 Kf3 46. Qe3+ Kg2 47. Qg1+ Kf3
48. Qf1+ Kg4 49. Qe2+ Rf3 50. Qe6+ Rf5 51. Kb2 Kf3 52. Qe3+ Kg2 53. Qg1+
Kf3 54. Qf1+ Kg4 55. Qe2+ Rf3 56. Qe6+ Rf5 57. Ka3 Kf3 58. Qe3+ Kg2 59.
Qg1+ Kf3 60. Qf1+ Kg4 61. Qe2+ Rf3 62. Qe6+ Rf5 63. Kxa4 Kf3 64. Qe3+ Kg2
65. Qg1+ Kf3 66. Qf1+ Kg4 67. Qe2+ Rf3 68. Qe6+ Rf5 69. Ka3 Kf3 70. Qe3+
Kg2 71. Qg1+ Kf3 72. Qf1+ Kg4 73. Qe2+ Rf3 74. Qe6+ Rf5 75. Kb2 Kf3 76.
Qe3+ Kg2 77. Qg1+ Kf3 78. Qf1+ Kg4 79. Qe2+ Rf3 80. Qe6+ Rf5 81. Kc1 a5 82.
Kd1 a4 83. Kc1 Kf3 84. Qe3+ Kg2 85. Qg1+ Kf3 86. Qf1+ Kg4 87. Qe2+ Rf3 88.
Qe6+ Rf5 89. Kd1 a6 90. Kc1 Kf3 91. Qe3+ Kg2 92. Qg1+ Kf3 93. Qf1+ Kg4 94.
Qe2+ Rf3 95. Qe6+ Rf5 96. Kd1 a5 97. Kc1 Kf3 98. Qe3+ Kg2 99. Qg1+ Kf3 100.
Qf1+ Kg4 101. Qe2+ Rf3 102. Qe6+ Rf5 103. Kd1 a3 104. Kc1 Kf3 105. Qe3+ Kg2
106. Qg1+ Kf3 107. Qf1+ Kg4 108. Qe2+ Rf3 109. Qe6+ Rf5 110. Kb1 Kf3 111.
Qe3+ Kg2 112. Qg1+ Kf3 113. Qf1+ Kg4 114. Qe2+ Rf3 115. Qe6+ Rf5 116. Ka2
Kf3 117. Qe3+ Kg2 118. Qg1+ Kf3 119. Qf1+ Kg4 120. Qe2+ Rf3 121. Qe6+ Rf5
122. Kxa3 Kf3 123. Qe3+ Kg2 124. Qg1+ Kf3 125. Qf1+ Kg4 126. Qe2+ Rf3 127.
Qe6+ Rf5 128. Kb2 Kf3 129. Qe3+ Kg2 130. Qg1+ Kf3 131. Qf1+ Kg4 132. Qe2+
Rf3 133. Qe6+ Rf5 134. Kc1 Kf3 135. Qe3+ Kg2 136. Qg1+ Kf3 137. Qf1+ Kg4
138. Qe2+ Rf3 139. Qe6+ Rf5 140. Kd1 a4 141. Kc1 Kf3 142. Qe3+ Kg2 143.
Qg1+ Kf3 144. Qf1+ Kg4 145. Qe2+ Rf3 146. Qe6+ Rf5 147. Kd1 a3 148. Kc1 Kf3
149. Qe3+ Kg2 150. Qg1+ Kf3 151. Qf1+ Kg4 152. Qe2+ Rf3 153. Qe6+ Rf5 154.
Kb1 Kf3 155. Qe3+ Kg2 156. Qg1+ Kf3 157. Qf1+ Kg4 158. Qe2+ Rf3 159. Qe6+
Rf5 160. Ka2 Kf3 161. Qe3+ Kg2 162. Qg1+ Kf3 163. Qf1+ Kg4 164. Qe2+ Rf3
165. Qe6+ Rf5 166. Kxa3 Kf3 167. Qe3+ Kg2 168. Qg1+ Kf3 169. Qf1+ Kg4 170.
Qe2+ Rf3 171. Qe6+ Rf5 172. Kb2 Kf3 173. Qe3+ Kg2 174. Qg1+ Kf3 175. Qf1+
Ke4 176. Qxc4+ Kf3 177. Qf1+ Kg4 178. Qe2+ Rf3 179. Qe6+ Rf5 180. Kc1 Kf3
181. Qe3+ Kg2 182. Qg1+ Kf3 183. Qf1+ Kg4 184. Qe2+ Rf3 185. Qe6+ Rf5 186.
Kd1 Nhf8 187. Nf6+ Kf3 188. Qe2# *

[/pgn]

Why not 89.Kb2 ?

[Spliffjiffer]

I was stupid...

...my solution was this one:

[pgn]
[Event "Computer Schach Partie"]
[Site "DESKTOP-F6DA4QS"]
[Date "2022.09.27"]
[Round "?"]
[White "Corchess2_x64_avx2"]
[Black "ChestUCI"]
[Result "*"]
[BlackElo "2000"]
[Time "12:15:57"]
[WhiteElo "2000"]
[SetUp "1"]
[FEN "1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "375"]
[WhiteType "human"]
[BlackType "human"]

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7.
Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13.
Kb2 c4 14. Ka3 Kf3 15. Qe3+ Kg2 16. Qg1+ Kf3 17. Qf1+ Kg4 18. Qe2+ Rf3 19.
Qe6+ Rf5 20. Kxa4 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3
25. Qe6+ Rf5 26. Ka3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+
Rf3 31. Qe6+ Rf5 32. Kb2 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36.
Qe2+ Rf3 37. Qe6+ Rf5 38. Kc1 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4
42. Qe2+ Rf3 43. Qe6+ Rf5 44. Kd1 a4 45. Kc1 Kf3 46. Qe3+ Kg2 47. Qg1+ Kf3
48. Qf1+ Kg4 49. Qe2+ Rf3 50. Qe6+ Rf5 51. Kb2 Kf3 52. Qe3+ Kg2 53. Qg1+
Kf3 54. Qf1+ Kg4 55. Qe2+ Rf3 56. Qe6+ Rf5 57. Ka3 Kf3 58. Qe3+ Kg2 59.
Qg1+ Kf3 60. Qf1+ Kg4 61. Qe2+ Rf3 62. Qe6+ Rf5 63. Kxa4 Kf3 64. Qe3+ Kg2
65. Qg1+ Kf3 66. Qf1+ Kg4 67. Qe2+ Rf3 68. Qe6+ Rf5 69. Ka3 Kf3 70. Qe3+
Kg2 71. Qg1+ Kf3 72. Qf1+ Kg4 73. Qe2+ Rf3 74. Qe6+ Rf5 75. Kb2 Kf3 76.
Qe3+ Kg2 77. Qg1+ Kf3 78. Qf1+ Kg4 79. Qe2+ Rf3 80. Qe6+ Rf5 81. Kc1 a5 82.
Kd1 a4 83. Kc1 Kf3 84. Qe3+ Kg2 85. Qg1+ Kf3 86. Qf1+ Kg4 87. Qe2+ Rf3 88.
Qe6+ Rf5 89. Kd1 a6 90. Kc1 Kf3 91. Qe3+ Kg2 92. Qg1+ Kf3 93. Qf1+ Kg4 94.
Qe2+ Rf3 95. Qe6+ Rf5 96. Kd1 a5 97. Kc1 Kf3 98. Qe3+ Kg2 99. Qg1+ Kf3 100.
Qf1+ Kg4 101. Qe2+ Rf3 102. Qe6+ Rf5 103. Kd1 a3 104. Kc1 Kf3 105. Qe3+ Kg2
106. Qg1+ Kf3 107. Qf1+ Kg4 108. Qe2+ Rf3 109. Qe6+ Rf5 110. Kb1 Kf3 111.
Qe3+ Kg2 112. Qg1+ Kf3 113. Qf1+ Kg4 114. Qe2+ Rf3 115. Qe6+ Rf5 116. Ka2
Kf3 117. Qe3+ Kg2 118. Qg1+ Kf3 119. Qf1+ Kg4 120. Qe2+ Rf3 121. Qe6+ Rf5
122. Kxa3 Kf3 123. Qe3+ Kg2 124. Qg1+ Kf3 125. Qf1+ Kg4 126. Qe2+ Rf3 127.
Qe6+ Rf5 128. Kb2 Kf3 129. Qe3+ Kg2 130. Qg1+ Kf3 131. Qf1+ Kg4 132. Qe2+
Rf3 133. Qe6+ Rf5 134. Kc1 Kf3 135. Qe3+ Kg2 136. Qg1+ Kf3 137. Qf1+ Kg4
138. Qe2+ Rf3 139. Qe6+ Rf5 140. Kd1 a4 141. Kc1 Kf3 142. Qe3+ Kg2 143.
Qg1+ Kf3 144. Qf1+ Kg4 145. Qe2+ Rf3 146. Qe6+ Rf5 147. Kd1 a3 148. Kc1 Kf3
149. Qe3+ Kg2 150. Qg1+ Kf3 151. Qf1+ Kg4 152. Qe2+ Rf3 153. Qe6+ Rf5 154.
Kb1 Kf3 155. Qe3+ Kg2 156. Qg1+ Kf3 157. Qf1+ Kg4 158. Qe2+ Rf3 159. Qe6+
Rf5 160. Ka2 Kf3 161. Qe3+ Kg2 162. Qg1+ Kf3 163. Qf1+ Kg4 164. Qe2+ Rf3
165. Qe6+ Rf5 166. Kxa3 Kf3 167. Qe3+ Kg2 168. Qg1+ Kf3 169. Qf1+ Kg4 170.
Qe2+ Rf3 171. Qe6+ Rf5 172. Kb2 Kf3 173. Qe3+ Kg2 174. Qg1+ Kf3 175. Qf1+
Ke4 176. Qxc4+ Kf3 177. Qf1+ Kg4 178. Qe2+ Rf3 179. Qe6+ Rf5 180. Kc1 Kf3
181. Qe3+ Kg2 182. Qg1+ Kf3 183. Qf1+ Kg4 184. Qe2+ Rf3 185. Qe6+ Rf5 186.
Kd1 Nhf8 187. Nf6+ Kf3 188. Qe2# *

[/pgn]

Why not 89.Kb2 ?

good question...i made an inaccurcy !?...feel free to correct my line...the d3 move (whenever its perfect kills all art !!?)

[Hobacle]

I was stupid...

...my solution was this one:

[pgn]
[Event "Computer Schach Partie"]
[Site "DESKTOP-F6DA4QS"]
[Date "2022.09.27"]
[Round "?"]
[White "Corchess2_x64_avx2"]
[Black "ChestUCI"]
[Result "*"]
[BlackElo "2000"]
[Time "12:15:57"]
[WhiteElo "2000"]
[SetUp "1"]
[FEN "1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "375"]
[WhiteType "human"]
[BlackType "human"]

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7.
Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13.
Kb2 c4 14. Ka3 Kf3 15. Qe3+ Kg2 16. Qg1+ Kf3 17. Qf1+ Kg4 18. Qe2+ Rf3 19.
Qe6+ Rf5 20. Kxa4 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3
25. Qe6+ Rf5 26. Ka3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+
Rf3 31. Qe6+ Rf5 32. Kb2 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36.
Qe2+ Rf3 37. Qe6+ Rf5 38. Kc1 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4
42. Qe2+ Rf3 43. Qe6+ Rf5 44. Kd1 a4 45. Kc1 Kf3 46. Qe3+ Kg2 47. Qg1+ Kf3
48. Qf1+ Kg4 49. Qe2+ Rf3 50. Qe6+ Rf5 51. Kb2 Kf3 52. Qe3+ Kg2 53. Qg1+
Kf3 54. Qf1+ Kg4 55. Qe2+ Rf3 56. Qe6+ Rf5 57. Ka3 Kf3 58. Qe3+ Kg2 59.
Qg1+ Kf3 60. Qf1+ Kg4 61. Qe2+ Rf3 62. Qe6+ Rf5 63. Kxa4 Kf3 64. Qe3+ Kg2
65. Qg1+ Kf3 66. Qf1+ Kg4 67. Qe2+ Rf3 68. Qe6+ Rf5 69. Ka3 Kf3 70. Qe3+
Kg2 71. Qg1+ Kf3 72. Qf1+ Kg4 73. Qe2+ Rf3 74. Qe6+ Rf5 75. Kb2 Kf3 76.
Qe3+ Kg2 77. Qg1+ Kf3 78. Qf1+ Kg4 79. Qe2+ Rf3 80. Qe6+ Rf5 81. Kc1 a5 82.
Kd1 a4 83. Kc1 Kf3 84. Qe3+ Kg2 85. Qg1+ Kf3 86. Qf1+ Kg4 87. Qe2+ Rf3 88.
Qe6+ Rf5 89. Kd1 a6 90. Kc1 Kf3 91. Qe3+ Kg2 92. Qg1+ Kf3 93. Qf1+ Kg4 94.
Qe2+ Rf3 95. Qe6+ Rf5 96. Kd1 a5 97. Kc1 Kf3 98. Qe3+ Kg2 99. Qg1+ Kf3 100.
Qf1+ Kg4 101. Qe2+ Rf3 102. Qe6+ Rf5 103. Kd1 a3 104. Kc1 Kf3 105. Qe3+ Kg2
106. Qg1+ Kf3 107. Qf1+ Kg4 108. Qe2+ Rf3 109. Qe6+ Rf5 110. Kb1 Kf3 111.
Qe3+ Kg2 112. Qg1+ Kf3 113. Qf1+ Kg4 114. Qe2+ Rf3 115. Qe6+ Rf5 116. Ka2
Kf3 117. Qe3+ Kg2 118. Qg1+ Kf3 119. Qf1+ Kg4 120. Qe2+ Rf3 121. Qe6+ Rf5
122. Kxa3 Kf3 123. Qe3+ Kg2 124. Qg1+ Kf3 125. Qf1+ Kg4 126. Qe2+ Rf3 127.
Qe6+ Rf5 128. Kb2 Kf3 129. Qe3+ Kg2 130. Qg1+ Kf3 131. Qf1+ Kg4 132. Qe2+
Rf3 133. Qe6+ Rf5 134. Kc1 Kf3 135. Qe3+ Kg2 136. Qg1+ Kf3 137. Qf1+ Kg4
138. Qe2+ Rf3 139. Qe6+ Rf5 140. Kd1 a4 141. Kc1 Kf3 142. Qe3+ Kg2 143.
Qg1+ Kf3 144. Qf1+ Kg4 145. Qe2+ Rf3 146. Qe6+ Rf5 147. Kd1 a3 148. Kc1 Kf3
149. Qe3+ Kg2 150. Qg1+ Kf3 151. Qf1+ Kg4 152. Qe2+ Rf3 153. Qe6+ Rf5 154.
Kb1 Kf3 155. Qe3+ Kg2 156. Qg1+ Kf3 157. Qf1+ Kg4 158. Qe2+ Rf3 159. Qe6+
Rf5 160. Ka2 Kf3 161. Qe3+ Kg2 162. Qg1+ Kf3 163. Qf1+ Kg4 164. Qe2+ Rf3
165. Qe6+ Rf5 166. Kxa3 Kf3 167. Qe3+ Kg2 168. Qg1+ Kf3 169. Qf1+ Kg4 170.
Qe2+ Rf3 171. Qe6+ Rf5 172. Kb2 Kf3 173. Qe3+ Kg2 174. Qg1+ Kf3 175. Qf1+
Ke4 176. Qxc4+ Kf3 177. Qf1+ Kg4 178. Qe2+ Rf3 179. Qe6+ Rf5 180. Kc1 Kf3
181. Qe3+ Kg2 182. Qg1+ Kf3 183. Qf1+ Kg4 184. Qe2+ Rf3 185. Qe6+ Rf5 186.
Kd1 Nhf8 187. Nf6+ Kf3 188. Qe2# *

[/pgn]

Why not 89.Kb2 ?

good question...i made an inaccurcy !?...feel free to correct my line...the d3 move (whenever its perfect kills all art !!?)

The composer of this composition claimed it was a mate in 226 without any dual. But I wanted to cook it. So we just need to find a shorter solution after 13...Kf3 because
1) it's the move from the author's solution
2) 13...c4 shortens the solution doubtlessly

[Spliffjiffer]

I was stupid...

...my solution was this one:

[pgn]
[Event "Computer Schach Partie"]
[Site "DESKTOP-F6DA4QS"]
[Date "2022.09.27"]
[Round "?"]
[White "Corchess2_x64_avx2"]
[Black "ChestUCI"]
[Result "*"]
[BlackElo "2000"]
[Time "12:15:57"]
[WhiteElo "2000"]
[SetUp "1"]
[FEN "1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "375"]
[WhiteType "human"]
[BlackType "human"]

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7.
Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13.
Kb2 c4 14. Ka3 Kf3 15. Qe3+ Kg2 16. Qg1+ Kf3 17. Qf1+ Kg4 18. Qe2+ Rf3 19.
Qe6+ Rf5 20. Kxa4 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3
25. Qe6+ Rf5 26. Ka3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+
Rf3 31. Qe6+ Rf5 32. Kb2 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36.
Qe2+ Rf3 37. Qe6+ Rf5 38. Kc1 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4
42. Qe2+ Rf3 43. Qe6+ Rf5 44. Kd1 a4 45. Kc1 Kf3 46. Qe3+ Kg2 47. Qg1+ Kf3
48. Qf1+ Kg4 49. Qe2+ Rf3 50. Qe6+ Rf5 51. Kb2 Kf3 52. Qe3+ Kg2 53. Qg1+
Kf3 54. Qf1+ Kg4 55. Qe2+ Rf3 56. Qe6+ Rf5 57. Ka3 Kf3 58. Qe3+ Kg2 59.
Qg1+ Kf3 60. Qf1+ Kg4 61. Qe2+ Rf3 62. Qe6+ Rf5 63. Kxa4 Kf3 64. Qe3+ Kg2
65. Qg1+ Kf3 66. Qf1+ Kg4 67. Qe2+ Rf3 68. Qe6+ Rf5 69. Ka3 Kf3 70. Qe3+
Kg2 71. Qg1+ Kf3 72. Qf1+ Kg4 73. Qe2+ Rf3 74. Qe6+ Rf5 75. Kb2 Kf3 76.
Qe3+ Kg2 77. Qg1+ Kf3 78. Qf1+ Kg4 79. Qe2+ Rf3 80. Qe6+ Rf5 81. Kc1 a5 82.
Kd1 a4 83. Kc1 Kf3 84. Qe3+ Kg2 85. Qg1+ Kf3 86. Qf1+ Kg4 87. Qe2+ Rf3 88.
Qe6+ Rf5 89. Kd1 a6 90. Kc1 Kf3 91. Qe3+ Kg2 92. Qg1+ Kf3 93. Qf1+ Kg4 94.
Qe2+ Rf3 95. Qe6+ Rf5 96. Kd1 a5 97. Kc1 Kf3 98. Qe3+ Kg2 99. Qg1+ Kf3 100.
Qf1+ Kg4 101. Qe2+ Rf3 102. Qe6+ Rf5 103. Kd1 a3 104. Kc1 Kf3 105. Qe3+ Kg2
106. Qg1+ Kf3 107. Qf1+ Kg4 108. Qe2+ Rf3 109. Qe6+ Rf5 110. Kb1 Kf3 111.
Qe3+ Kg2 112. Qg1+ Kf3 113. Qf1+ Kg4 114. Qe2+ Rf3 115. Qe6+ Rf5 116. Ka2
Kf3 117. Qe3+ Kg2 118. Qg1+ Kf3 119. Qf1+ Kg4 120. Qe2+ Rf3 121. Qe6+ Rf5
122. Kxa3 Kf3 123. Qe3+ Kg2 124. Qg1+ Kf3 125. Qf1+ Kg4 126. Qe2+ Rf3 127.
Qe6+ Rf5 128. Kb2 Kf3 129. Qe3+ Kg2 130. Qg1+ Kf3 131. Qf1+ Kg4 132. Qe2+
Rf3 133. Qe6+ Rf5 134. Kc1 Kf3 135. Qe3+ Kg2 136. Qg1+ Kf3 137. Qf1+ Kg4
138. Qe2+ Rf3 139. Qe6+ Rf5 140. Kd1 a4 141. Kc1 Kf3 142. Qe3+ Kg2 143.
Qg1+ Kf3 144. Qf1+ Kg4 145. Qe2+ Rf3 146. Qe6+ Rf5 147. Kd1 a3 148. Kc1 Kf3
149. Qe3+ Kg2 150. Qg1+ Kf3 151. Qf1+ Kg4 152. Qe2+ Rf3 153. Qe6+ Rf5 154.
Kb1 Kf3 155. Qe3+ Kg2 156. Qg1+ Kf3 157. Qf1+ Kg4 158. Qe2+ Rf3 159. Qe6+
Rf5 160. Ka2 Kf3 161. Qe3+ Kg2 162. Qg1+ Kf3 163. Qf1+ Kg4 164. Qe2+ Rf3
165. Qe6+ Rf5 166. Kxa3 Kf3 167. Qe3+ Kg2 168. Qg1+ Kf3 169. Qf1+ Kg4 170.
Qe2+ Rf3 171. Qe6+ Rf5 172. Kb2 Kf3 173. Qe3+ Kg2 174. Qg1+ Kf3 175. Qf1+
Ke4 176. Qxc4+ Kf3 177. Qf1+ Kg4 178. Qe2+ Rf3 179. Qe6+ Rf5 180. Kc1 Kf3
181. Qe3+ Kg2 182. Qg1+ Kf3 183. Qf1+ Kg4 184. Qe2+ Rf3 185. Qe6+ Rf5 186.
Kd1 Nhf8 187. Nf6+ Kf3 188. Qe2# *

[/pgn]

Why not 89.Kb2 ?

good question...i made an inaccurcy !?...feel free to correct my line...the d3 move (whenever its perfect kills all art !!?)

The composer of this composition claimed it was a mate in 226 without any dual. But I wanted to cook it. So we just need to find a shorter solution after 13...Kf3 because
1) it's the move from the author's solution
2) 13...c4 shortens the solution doubtlessly

ok!...currently i believe that 13..Kf3?! is just worse than# 126 !?

[Hobacle]

ok!...currently i believe that 13..Kf3?! is just worse than# 126 !?

So do I.

[Hobacle]

Version 2, 19 positions in all. But it's a bit easier than the 17-position version. All of these positions are similar, so... You know what to do?

Code: Select all

1. 8/3N3n/6n1/2p2Qpb/2P4r/1KPPk2p/7B/8 b - - 0 1
2. 8/3N3n/6n1/2p2Qpb/K1P4r/2PPk2p/7B/8 b - - 0 1
3. 8/3N3n/6n1/K1p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
4. 8/3N3n/K5n1/2p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
5. 8/K2N3n/6n1/2p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
6. 8/p2N3n/K5n1/2p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
7. 8/3N3n/p5n1/K1p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
8. 8/p2N3n/6n1/K1p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
9. 8/p2N3n/p5n1/K1p2Qpb/2P4r/2PPk2p/7B/8 b - - 0 1
10. 8/3N3n/p5n1/p1p2Qpb/K1P4r/2PPk2p/7B/8 b - - 0 1
11. 8/p2N3n/6n1/p1p2Qpb/K1P4r/2PPk2p/7B/8 b - - 0 1
12. 8/p2N3n/p5n1/2p2Qpb/K1P4r/2PPk2p/7B/8 b - - 0 1
13. 8/p2N3n/p5n1/p1p2Qpb/K1P4r/2PPk2p/7B/8 b - - 0 1
14. 8/3N3n/p5n1/p1p2Qpb/p1P4r/K1PPk2p/7B/8 b - - 0 1
15. 8/p2N3n/6n1/p1p2Qpb/p1P4r/K1PPk2p/7B/8 b - - 0 1
16. 8/p2N3n/p5n1/2p2Qpb/p1P4r/K1PPk2p/7B/8 b - - 0 1
17. 8/p2N3n/p5n1/p1p2Qpb/2P4r/K1PPk2p/7B/8 b - - 0 1
18. 8/p2N3n/p5n1/p1p2Qpb/2P4r/p1PPk2p/K6B/8 b - - 0 1
19. 8/p2N3n/p5n1/p1p2Qpb/p1P4r/2PPk2p/1K5B/8 b - - 0 1

And, here's my main line of the 13...Kf3 variation:
[pgn][Event "?"]
[Site "?"]
[Date "2022.10.02"]
[Round "?"]
[White ""]
[Black ""]
[Result "*"]
[FEN "8/p2N3n/p3Q1n1/p1p2rpb/p5kr/2P4p/1KPP3B/8 b - - 25 13"]
[SetUp "1"]

13... Kf3 14. Qe3+ Kg2 15. Qg1+ Kf3 16. Qf1+ Kg4 17. Qe2+ Rf3 18. Qe6+ Rf5 19.
c4 a3+ 20. Ka2 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3 25. Qe6+
Rf5 26. c3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+ Rf3 31. Qe6+ Rf5
32. Kxa3 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36. Qe2+ Rf3 37. Qe6+ Rf5
38. Ka4 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4 42. Qe2+ Rf3 43. Qe6+ Rf5
44. Kxa5 Kf3 45. Qe3+ Kg2 46. Qg1+ Kf3 47. Qf1+ Kg4 48. Qe2+ Rf3 49. Qe6+ Rf5
50. Kxa6 Kf3 51. Qe3+ Kg2 52. Qg1+ Kf3 53. Qf1+ Kg4 54. Qe2+ Rf3 55. Qe6+ Rf5
56. Kxa7 Kf3 57. Qe3+ Kg2 58. Qg1+ Kf3 59. Qf1+ Kg4 60. Qe2+ Rf3 61. Qe6+ Rf5
62. Ka6 Kf3 63. Qe3+ Kg2 64. Qg1+ Kf3 65. Qf1+ Kg4 66. Qe2+ Rf3 67. Qe6+ Rf5
68. Ka5 Kf3 69. Qe3+ Kg2 70. Qg1+ Kf3 71. Qf1+ Kg4 72. Qe2+ Rf3 73. Qe6+ Rf5
74. Ka4 Kf3 75. Qe3+ Kg2 76. Qg1+ Kf3 77. Qf1+ Kg4 78. Qe2+ Rf3 79. Qe6+ Rf5
80. Kb3 Kf3 81. Qe3+ Kg2 82. Qg1+ Kf3 83. Qf1+ *

[/pgn]

We just need to finish the 19 positions above to prove this line.

[peter]

And, here's my main line of the 13...Kf3 variation:
[pgn][Event "?"]
[Site "?"]
[Date "2022.10.02"]
[Round "?"]
[White ""]
[Black ""]
[Result "*"]
[FEN "8/p2N3n/p3Q1n1/p1p2rpb/p5kr/2P4p/1KPP3B/8 b - - 25 13"]
[SetUp "1"]

13... Kf3 14. Qe3+ Kg2 15. Qg1+ Kf3 16. Qf1+ Kg4 17. Qe2+ Rf3 18. Qe6+ Rf5 19.
c4 a3+ 20. Ka2 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3 25. Qe6+
Rf5 26. c3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+ Rf3 31. Qe6+ Rf5
32. Kxa3 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36. Qe2+ Rf3 37. Qe6+ Rf5
38. Ka4 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4 42. Qe2+ Rf3 43. Qe6+ Rf5
44. Kxa5 Kf3 45. Qe3+ Kg2 46. Qg1+ Kf3 47. Qf1+ Kg4 48. Qe2+ Rf3 49. Qe6+ Rf5
50. Kxa6 Kf3 51. Qe3+ Kg2 52. Qg1+ Kf3 53. Qf1+ Kg4 54. Qe2+ Rf3 55. Qe6+ Rf5
56. Kxa7 Kf3 57. Qe3+ Kg2 58. Qg1+ Kf3 59. Qf1+ Kg4 60. Qe2+ Rf3 61. Qe6+ Rf5
62. Ka6 Kf3 63. Qe3+ Kg2 64. Qg1+ Kf3 65. Qf1+ Kg4 66. Qe2+ Rf3 67. Qe6+ Rf5
68. Ka5 Kf3 69. Qe3+ Kg2 70. Qg1+ Kf3 71. Qf1+ Kg4 72. Qe2+ Rf3 73. Qe6+ Rf5
74. Ka4 Kf3 75. Qe3+ Kg2 76. Qg1+ Kf3 77. Qf1+ Kg4 78. Qe2+ Rf3 79. Qe6+ Rf5
80. Kb3 Kf3 81. Qe3+ Kg2 82. Qg1+ Kf3 83. Qf1+ *
[/pgn]

Before I beliefe in this one line, that takes > 100 moves to mate, I'd like to see this one denied, we had already way back then:

forum3/viewtopic.php?p=920375#p920375

As Ajedrecista showed, it was too long for one move even, yet DTM could be kept in hash backward to about move nr.40 with DTM 73 all in all. >100 now after a White deviation at 32nd move. Old line transposes to the new one at 32., why should Kxa3 be better there than d4 in old line was, sparing about 40,50 moves to mate?

How to use your 17 or 19 or 100 positions? For an endgame- database you need about 40000 for the KQK endgame only

[peter]

And, here's my main line of the 13...Kf3 variation:
[pgn][Event "?"]
[Site "?"]
[Date "2022.10.02"]
[Round "?"]
[White ""]
[Black ""]
[Result "*"]
[FEN "8/p2N3n/p3Q1n1/p1p2rpb/p5kr/2P4p/1KPP3B/8 b - - 25 13"]
[SetUp "1"]

13... Kf3 14. Qe3+ Kg2 15. Qg1+ Kf3 16. Qf1+ Kg4 17. Qe2+ Rf3 18. Qe6+ Rf5 19.
c4 a3+ 20. Ka2 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3 25. Qe6+
Rf5 26. c3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+ Rf3 31. Qe6+ Rf5
32. Kxa3 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36. Qe2+ Rf3 37. Qe6+ Rf5
38. Ka4 Kf3 39. Qe3+ Kg2 40. Qg1+ Kf3 41. Qf1+ Kg4 42. Qe2+ Rf3 43. Qe6+ Rf5
44. Kxa5 Kf3 45. Qe3+ Kg2 46. Qg1+ Kf3 47. Qf1+ Kg4 48. Qe2+ Rf3 49. Qe6+ Rf5
50. Kxa6 Kf3 51. Qe3+ Kg2 52. Qg1+ Kf3 53. Qf1+ Kg4 54. Qe2+ Rf3 55. Qe6+ Rf5
56. Kxa7 Kf3 57. Qe3+ Kg2 58. Qg1+ Kf3 59. Qf1+ Kg4 60. Qe2+ Rf3 61. Qe6+ Rf5
62. Ka6 Kf3 63. Qe3+ Kg2 64. Qg1+ Kf3 65. Qf1+ Kg4 66. Qe2+ Rf3 67. Qe6+ Rf5
68. Ka5 Kf3 69. Qe3+ Kg2 70. Qg1+ Kf3 71. Qf1+ Kg4 72. Qe2+ Rf3 73. Qe6+ Rf5
74. Ka4 Kf3 75. Qe3+ Kg2 76. Qg1+ Kf3 77. Qf1+ Kg4 78. Qe2+ Rf3 79. Qe6+ Rf5
80. Kb3 Kf3 81. Qe3+ Kg2 82. Qg1+ Kf3 83. Qf1+ *
[/pgn]

Before I beliefe in this one line,

Started a new Backward of it, deviating with 38.Qe2+ from Ka4 I get this one output after move nr. 45:

8/p2N3n/p7/3P2pb/p1P2n1r/K6p/4k2B/6Q1 w - - 0 1

Analysis by HekaStockfishNNUE 280920F:

46.Se5 Sd3 47.Sxd3 Kxd3 48.Db1+ Kd2 49.Dxh7 Ld1 50.Df5 Td4 51.Df2+ Kd3 52.d6 Lg4 53.Lg1 Tf4 54.De3+ Kxc4 55.Dc5+ Kd3 56.Dxg5 Ke4 57.De7+ Kd5 58.d7 Lxd7 59.Dxd7+ Ke4 60.De6+ Kf3 61.Dxh3+ Ke4 62.De6+ Kf3 63.Le3 Th4 64.Df6+ Ke2 65.Dxh4 Kxe3 66.Dxa4 a5 67.Kb3 Kd3 68.Dc4+ Ke3 69.Kc3 a6 70.Dd4+ Kf3 71.Kd3 a4 72.Df6+ Kg4 73.Ke3 a3 74.Dg6+ Kh4 75.Kf3 a2 76.Dg4#
+- (#31) Depth: 56/62 00:03:32 18436MN
White mates

taking these first 45 moves:

1N2Q3/p6n/p5n1/p1p2rpb/p4k1r/K1P4p/2PP4/6B1 w - - 0 1

1. Bh2+ Kf3 2. Qe3+ Kg2 3. Qg1+ Kf3 4. Qf1+ Kg4 5. Qe2+ Rf3 6. Qe6+ Rf5 7. Nd7 Kf3 8. Qe3+ Kg2 9. Qg1+ Kf3 10. Qf1+ Kg4 11. Qe2+ Rf3 12. Qe6+ Rf5 13. Kb2 Kf3 14. Qe3+ Kg2 15. Qg1+ Kf3 16. Qf1+ Kg4 17. Qe2+ Rf3 18. Qe6+ Rf5 19. c4 a3+ 20. Ka2 Kf3 21. Qe3+ Kg2 22. Qg1+ Kf3 23. Qf1+ Kg4 24. Qe2+ Rf3 25. Qe6+ Rf5 26. c3 Kf3 27. Qe3+ Kg2 28. Qg1+ Kf3 29. Qf1+ Kg4 30. Qe2+ Rf3 31. Qe6+ Rf5 32. Kxa3 Kf3 33. Qe3+ Kg2 34. Qg1+ Kf3 35. Qf1+ Kg4 36. Qe2+ Rf3 37. Qe6+ Rf5

38. Qe2+ Rf3 39. Qe6+ Rf5 40. d4 cxd4 41. cxd4 a4 42. d5 Kf3 43. Qxf5+ Nf4 44. Qb1 Kf2 45. Qg1+ Ke2

Problem still is, even with some better hardware than mine, there won't be any way of keeping DTM in hash further backward than to maybe 35th, 30th move, assuming full DTM yet was something at least clearly <100.
If not with any SF- branch I tried, neither with SlowChess, that works quite well here too, I don't think it would work with Chest or Gustav neither.
And what does it help to solve any position after about 30 moves from starting one?
You'll have to find another one definition of "prove" for the DTM you assume to be the correct one