Probably the longest “Rambling Rook” composition around

[Nordlandia]

Here is another one found in EG magazine few years ago.

[d]kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

[peter]

Gonna try 11...Rf4+, when I'll find more time again regards

Mating score isn't to be kept in hash back to starting position, but at least a Bingo- eval is to be got:

k7/4R3/2PBQ3/1RBB2r1/7K/4N2B/4NN1N/4NB1B b - - 0 1

Analysis by Stockfish-MOJO 281120 01120:

1...Rg4+ 2.Kh5 Rg5+ 3.Kh6 Rg6+ 4.Kh7 Rg7+ 5.Kh8 Rh7+ 6.Kg8 Rg7+ 7.Kf8 Rg8+ 8.Kf7 Rf8+ 9.Kg7 Rf7+ 10.Kg6 Rf6+ 11.Kh5 Rf5+ 12.Kh4 Rf4+ 13.Bg4 Rxg4+ 14.Kh5 Rg5+ 15.Kh6 Rg6+ 16.Kh7 Rg7+ 17.Kh8 Rh7+ 18.Kg8 Rg7+ 19.Kf8 Rg8+ 20.Kf7 Rf8+ 21.Kg7 Rf7+ 22.Kg6 Rf6+ 23.Kh5 Rf5+ 24.Kh4 Rf4+ 25.Neg4 Rxg4+ 26.Kh5 Rg5+ 27.Kh6 Rg6+ 28.Kh7 Rg7+ 29.Kh8 Rh7+ 30.Kg8 Rg7+ 31.Kf8 Rg8+ 32.Kf7 Rf8+ 33.Kg6 Rf6+ 34.Kg5 Rf5+ 35.Kh4 Rf4+ 36.Nfg4 Rxg4+ 37.Kh5 Rg5+ 38.Kh6 Rg6+ 39.Kh7 Rg7+ 40.Kh8 Rh7+ 41.Kg8 Rg7+ 42.Kf8 Rg8+ 43.Kf7 Rf8+ 44.Kg6 Rf6+ 45.Kh5 Rf5+ 46.Kh4 Rf4+ 47.Ng4 Rxg4+ 48.Kh5 Rg5+ 49.Kh6 Rg6+ 50.Kh7 Rg7+ 51.Kh8 Rh7+ 52.Kg8 Rg7+ 53.Kf8 Rg8+ 54.Kf7 Rf8+ 55.Kg6 Rf6+ 56.Kg5 Rf5+ 57.Kg4 Rf4+ 58.Kh3 Rh4+ 59.Kg3 Rh3+ 60.Kg4 Rg3+ 61.Kf5 Rg5+ 62.Ke4 Re5+ 63.Kd3 Re3+ 64.Kc4 Rc3+ 65.Kd4 Rd3+ 66.Ke5 Rxd5+ 67.Kf4 Rf5+ 68.Kg4 Rf4+ 69.Kh3 Rf3+ 70.Bg3 Rxg3+ 71.Kh4 Rg4+ 72.Kh5 Rg5+ 73.Kh6 Rg6+ 74.Kh7 Rg7+ 75.Kh8 Rh7+ 76.Kg8 Rg7+ 77.Kf8 Rg8+ 78.Kf7
+- (151.39) Depth: 154/154 00:21:20 27127MN

At the end of this output- line:

k5r1/4RK2/2P1Q3/1RB5/8/8/4N3/4NB1B b - - 0 1

Analysis by Stockfish-MOJO 281120 01120:

78...Rf8+ 79.Kg6 Rf6+ 80.Kg5 Rf5+ 81.Kh4 Rf4+ 82.Kh3 Rf3+ 83.Ng3 Rxg3+ 84.Kh4 Rg4+ 85.Kh5 Rg5+ 86.Kh6 Rg6+ 87.Kh7 Rg7+ 88.Kh8 Rh7+ 89.Kg8 Rg7+ 90.Kf8 Rg8+ 91.Kf7 Rf8+ 92.Kg6 Rf6+ 93.Kg5 Rf5+ 94.Kg4 Rf4+ 95.Kh3 Rf3+ 96.Kh2 Rf2+ 97.Bhg2 Rxg2+ 98.Kh3 Rg3+ 99.Kh4 Rg4+ 100.Kh5 Rg5+ 101.Kh6 Rg6+ 102.Kh7 Rg7+ 103.Kh8 Rh7+ 104.Kg8 Rg7+ 105.Kf8 Rg8+ 106.Kf7 Rf8+ 107.Kg6 Rf6+ 108.Kh5 Rf5+ 109.Kg4 Rf4+ 110.Kg3 Rf3+ 111.Kh2 Rf2+ 112.Ng2 Rxg2+ 113.Kh3 Rg3+ 114.Kh4 Rg4+ 115.Kh5 Rg5+ 116.Kh6 Rg6+ 117.Kh7 Rg7+ 118.Kh8 Rh7+ 119.Kg8 Rg7+ 120.Kf8 Rg8+ 121.Kf7 Rf8+ 122.Kg6 Rf6+ 123.Kh5 Rf5+ 124.Kh4 Rf4+ 125.Kh3 Rf3+ 126.Kh2 Rf2+ 127.Bg2 Rxg2+ 128.Kh3 Rg3+ 129.Kh4 Rg4+ 130.Kh5 Rg5+ 131.Kh6 Rg6+ 132.Kh7 Rg7+ 133.Kh8 Rh7+ 134.Kg8 Rg7+ 135.Kf8 Rg8+ 136.Kf7 Rf8+ 137.Kg6 Rf6+ 138.Kh5 Rf5+ 139.Kh4 Rf4+ 140.Kh3 Rf3+ 141.Kg2 Rf2+ 142.Kh1 Rh2+ 143.Kg1
+- (#93) Depth: 125/134 00:01:04 1540MN

So 171 all in all could be rather near to best DTM.

One more little shortcut at 58...Rh4+ again, instead:

k7/4R3/2PBQ3/1RBB4/5r2/7K/4N3/4NB1B b - - 0 1

Analysis by Stockfish-MOJO 281120 01120:

58...Rf3+ 59.Ng3 Rxg3+ 60.Kh4 Rg4+ 61.Kh5 Rg5+ 62.Kh6 Rg6+ 63.Kh7 Rg7+ 64.Kh8 Rh7+ 65.Kg8 Rg7+ 66.Kf8 Rg8+ 67.Kf7 Rf8+ 68.Kg6 Rf6+ 69.Kh5 Rf5+ 70.Kg4 Rf4+ 71.Kh3 Rf3+ 72.Bg3 Rxg3+ 73.Kh4 Rg4+ 74.Kh5 Rg5+ 75.Kh6 Rg6+ 76.Kh7 Rg7+ 77.Kh8 Rh7+ 78.Kg8 Rg7+ 79.Kf8 Rg8+ 80.Kf7 Rf8+ 81.Kg6 Rf6+ 82.Kh5 Rf5+ 83.Kh4 Rf4+ 84.Kg3 Rf3+ 85.Kh2 Rf2+ 86.Bdg2 Rxg2+ 87.Kh3 Rg3+ 88.Kh4 Rg4+ 89.Kh5 Rg5+ 90.Kh6 Rg6+ 91.Kh7 Rg7+ 92.Kh8 Rh7+ 93.Kg8 Rg7+ 94.Kf8 Rg8+ 95.Kf7 Rf8+ 96.Kg6 Rf6+ 97.Kg5 Rf5+ 98.Kh4 Rf4+ 99.Kh3 Rf3+ 100.Kh2 Rf2+ 101.Bhg2 Rxg2+ 102.Kh3 Rg3+ 103.Kh4 Rg4+ 104.Kh5 Rg5+ 105.Kh6 Rg6+ 106.Kh7 Rg7+ 107.Kh8 Rh7+ 108.Kg8 Rg7+ 109.Kf8 Rg8+ 110.Kf7 Rf8+ 111.Kg6 Rf6+ 112.Kh5 Rf5+ 113.Kg4 Rf4+ 114.Kh3 Rf3+ 115.Kh2 Rf2+ 116.Bg2 Rxg2+ 117.Kh3 Rg3+ 118.Kh4 Rg4+ 119.Kh5 Rg5+ 120.Kh6 Rg6+ 121.Kh7
+- (#117) Depth: 123/132 00:00:00 1783kN

[peter]

Here is another one found in EG magazine few years ago.

[d]kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

This one I have stored as from I.Chuiko 1969.
SF without nullmove pruning get's it quickly as for winning move and eval.
With a little Forward- Backward:

kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

Analysis by Stockfish-MOJO 281120 01120:

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.Ke8 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 Rd5 65.Kxe4 Rh5 66.c8Q Rh4+ 67.Bf4+ Ka7 68.Qb7#
+- (#67) Depth: 152/134 00:01:41 1894MN

Same DTM as in my database regards

[Hobacle]

OK.

[d]k7/4R3/2PBQ3/1RBB2r1/7K/4N2B/4NN1N/4NB1B b - - 0 1

[pgn][Event "2021.04.26"]
[Site ""]
[Date "Hobacle"]
[Round ""]
[White "#172"]
[Black ""]
[Result "1-0"]
[FEN "k7/4R3/2PBQ3/1RBB2r1/7K/4N2B/4NN1N/4NB1B b - - 0 1"]
[SetUp "1"]

1... Rg4+ 2. Kh5 Rg5+ 3. Kh6 Rg6+ 4. Kh7 Rg7+ 5. Kh8 Rh7+ 6. Kg8 Rg7+ 7. Kf8
Rg8+ 8. Kf7 Rf8+ 9. Kg6 Rf6+ 10. Kh5 Rf5+ 11. Kh4 Rf4+ 12. Neg4 Rxg4+ 13. Kh5
Rg5+ 14. Kh6 Rg6+ 15. Kh7 Rg7+ 16. Kh8 Rh7+ 17. Kg8 Rg7+ 18. Kf8 Rg8+ 19. Kf7
Rf8+ 20. Kg6 Rf6+ 21. Kh5 Rf5+ 22. Kh4 Rf4+ 23. Bg4 Rxg4+ 24. Kh5 Rg5+ 25. Kh6
Rg6+ 26. Kh7 Rg7+ 27. Kh8 Rh7+ 28. Kg8 Rg7+ 29. Kf8 Rg8+ 30. Kf7 Rf8+ 31. Kg6
Rf6+ 32. Kh5 Rf5+ 33. Kh4 Rf4+ 34. Nhg4 Rxg4+ 35. Kh5 Rg5+ 36. Kh6 Rg6+ 37. Kh7
Rg7+ 38. Kh8 Rh7+ 39. Kg8 Rg7+ 40. Kf8 Rg8+ 41. Kf7 Rf8+ 42. Kg6 Rf6+ 43. Kh5
Rf5+ 44. Kh4 Rf4+ 45. Ng4 Rxg4+ 46. Kh5 Rg5+ 47. Kh6 Rg6+ 48. Kh7 Rg7+ 49. Kh8
Rh7+ 50. Kg8 Rg7+ 51. Kf8 Rg8+ 52. Kf7 Rf8+ 53. Kg6 Rf6+ 54. Kh5 Rf5+ 55. Kh4
Rf4+ 56. Kh3 Rf3+ 57. Ng3 Rxg3+ 58. Kh4 Rg4+ 59. Kh5 Rg5+ 60. Kh6 Rg6+ 61. Kh7
Rg7+ 62. Kh8 Rh7+ 63. Kg8 Rg7+ 64. Kf8 Rg8+ 65. Kf7 Rf8+ 66. Kg6 Rf6+ 67. Kh5
Rf5+ 68. Kh4 Rf4+ 69. Kh3 Rf3+ 70. Bg3 Rxg3+ 71. Kh4 Rg4+ 72. Kh5 Rg5+ 73. Kh6
Rg6+ 74. Kh7 Rg7+ 75. Kh8 Rh7+ 76. Kg8 Rg7+ 77. Kf8 Rg8+ 78. Kf7 Rf8+ 79. Kg6
Rf6+ 80. Kh5 Rf5+ 81. Kh4 Rf4+ 82. Kh3 Rf3+ 83. Kh2 Rf2+ 84. Bdg2 Rxg2+ 85. Kh3
Rg3+ 86. Kh4 Rg4+ 87. Kh5 Rg5+ 88. Kh6 Rg6+ 89. Kh7 Rg7+ 90. Kh8 Rh7+ 91. Kg8
Rg7+ 92. Kf8 Rg8+ 93. Kf7 Rf8+ 94. Kg6 Rf6+ 95. Kh5 Rf5+ 96. Kh4 Rf4+ 97. Kh3
Rf3+ 98. Kh2 Rf2+ 99. Ng2 Rxg2+ 100. Kh3 Rg3+ 101. Kh4 Rg4+ 102. Kh5 Rg5+ 103.
Kh6 Rg6+ 104. Kh7 Rg7+ 105. Kh8 Rh7+ 106. Kg8 Rg7+ 107. Kf8 Rg8+ 108. Kf7 Rf8+
109. Kg6 Rf6+ 110. Kh5 Rf5+ 111. Kh4 Rf4+ 112. Kh3 Rf3+ 113. Kh2 Rf2+ 114. Bfg2
Rxg2+ 115. Kh3 Rg3+ 116. Kh4 Rg4+ 117. Kh5 Rg5+ 118. Kh6 Rg6+ 119. Kh7 Rg7+
120. Kh8 Rh7+ 121. Kg8 Rg7+ 122. Kf8 Rg8+ 123. Kf7 Rf8+ 124. Kg6 Rf6+ 125. Kh5
Rf5+ 126. Kh4 Rf4+ 127. Kh3 Rf3+ 128. Kh2 Rf2+ 129. Bg2 Rxg2+ 130. Kh3 Rg3+
131. Kh4 Rg4+ 132. Kh5 Rg5+ 133. Kh6 Rg6+ 134. Kh7 Rg7+ 135. Kh8 Rh7+ 136. Kg8
Rg7+ 137. Kf8 Rg8+ 138. Kf7 Rf8+ 139. Kg6 Rf6+ 140. Kh5 Rf5+ 141. Kh4 Rf4+ 142.
Kh3 Rf3+ 143. Kh2 Rf2+ 144. Kh1 Rh2+ 145. Kg1 Rg2+ 146. Kf1 Rf2+ 147. Ke1 Re2+
148. Kd1 Rd2+ 149. Kc1 Rc2+ 150. Kb1 Rb2+ 151. Ka1 Rb1+ 152. Ka2 Rb2+ 153. Ka3
Rb3+ 154. Ka4 Ra3+ 155. Kb4 Ra4+ 156. Kc3 Rc4+ 157. Kd3 Rd4+ 158. Ke2 Re4+ 159.
Kf1 Rf4+ 160. Bf2 Rxf2+ 161. Ke1 Re2+ 162. Kd1 Rd2+ 163. Kc1 Rc2+ 164. Kb1 Rb2+
165. Ka1 Rb1+ 166. Ka2 Rb2+ 167. Ka3 Rb3+ 168. Ka4 Ra3+ 169. Kb4 Rb3+ 170. Kc5
Rc3+ 171. Kb6 Rxc6+ 172. Qxc6+ Kb8 173. Re8# 1-0
[/pgn]

I'm terribly sorry for my previous mistakes but this time I'm sure it's right. #172, a bit shorter than my initial expectations, but still a good result.
As I said before, this one will be the last version unless someone expresses dissatisfaction with it. Not because there is no room for improvement in this result, but I'm too tired and, I don't like compositions with too many pieces created by promotion.
Too much time on it, however, no pain, no gains.

[peter]

OK.

[d]k7/4R3/2PBQ3/1RBB2r1/7K/4N2B/4NN1N/4NB1B b - - 0 1

[pgn][Event "2021.04.26"]
[Site ""]
[Date "Hobacle"]
[Round ""]
[White "#172"]
[Black ""]
[Result "1-0"]
[FEN "k7/4R3/2PBQ3/1RBB2r1/7K/4N2B/4NN1N/4NB1B b - - 0 1"]
[SetUp "1"]

1... Rg4+ 2. Kh5 Rg5+ 3. Kh6 Rg6+ 4. Kh7 Rg7+ 5. Kh8 Rh7+ 6. Kg8 Rg7+ 7. Kf8
Rg8+ 8. Kf7 Rf8+ 9. Kg6 Rf6+ 10. Kh5 Rf5+ 11. Kh4 Rf4+ 12. Neg4 Rxg4+ 13. Kh5
Rg5+ 14. Kh6 Rg6+ 15. Kh7 Rg7+ 16. Kh8 Rh7+ 17. Kg8 Rg7+ 18. Kf8 Rg8+ 19. Kf7
Rf8+ 20. Kg6 Rf6+ 21. Kh5 Rf5+ 22. Kh4 Rf4+ 23. Bg4 Rxg4+ 24. Kh5 Rg5+ 25. Kh6
Rg6+ 26. Kh7 Rg7+ 27. Kh8 Rh7+ 28. Kg8 Rg7+ 29. Kf8 Rg8+ 30. Kf7 Rf8+ 31. Kg6
Rf6+ 32. Kh5 Rf5+ 33. Kh4 Rf4+ 34. Nhg4 Rxg4+ 35. Kh5 Rg5+ 36. Kh6 Rg6+ 37. Kh7
Rg7+ 38. Kh8 Rh7+ 39. Kg8 Rg7+ 40. Kf8 Rg8+ 41. Kf7 Rf8+ 42. Kg6 Rf6+ 43. Kh5
Rf5+ 44. Kh4 Rf4+ 45. Ng4 Rxg4+ 46. Kh5 Rg5+ 47. Kh6 Rg6+ 48. Kh7 Rg7+ 49. Kh8
Rh7+ 50. Kg8 Rg7+ 51. Kf8 Rg8+ 52. Kf7 Rf8+ 53. Kg6 Rf6+ 54. Kh5 Rf5+ 55. Kh4
Rf4+ 56. Kh3 Rf3+ 57. Ng3 Rxg3+ 58. Kh4 Rg4+ 59. Kh5 Rg5+ 60. Kh6 Rg6+ 61. Kh7
Rg7+ 62. Kh8 Rh7+ 63. Kg8 Rg7+ 64. Kf8 Rg8+ 65. Kf7 Rf8+ 66. Kg6 Rf6+ 67. Kh5
Rf5+ 68. Kh4 Rf4+ 69. Kh3 Rf3+ 70. Bg3 Rxg3+ 71. Kh4 Rg4+ 72. Kh5 Rg5+ 73. Kh6
Rg6+ 74. Kh7 Rg7+ 75. Kh8 Rh7+ 76. Kg8 Rg7+ 77. Kf8 Rg8+ 78. Kf7 Rf8+ 79. Kg6
Rf6+ 80. Kh5 Rf5+ 81. Kh4 Rf4+ 82. Kh3 Rf3+ 83. Kh2 Rf2+ 84. Bdg2 Rxg2+ 85. Kh3
Rg3+ 86. Kh4 Rg4+ 87. Kh5 Rg5+ 88. Kh6 Rg6+ 89. Kh7 Rg7+ 90. Kh8 Rh7+ 91. Kg8
Rg7+ 92. Kf8 Rg8+ 93. Kf7 Rf8+ 94. Kg6 Rf6+ 95. Kh5 Rf5+ 96. Kh4 Rf4+ 97. Kh3
Rf3+ 98. Kh2 Rf2+ 99. Ng2 Rxg2+ 100. Kh3 Rg3+ 101. Kh4 Rg4+ 102. Kh5 Rg5+ 103.
Kh6 Rg6+ 104. Kh7 Rg7+ 105. Kh8 Rh7+ 106. Kg8 Rg7+ 107. Kf8 Rg8+ 108. Kf7 Rf8+
109. Kg6 Rf6+ 110. Kh5 Rf5+ 111. Kh4 Rf4+ 112. Kh3 Rf3+ 113. Kh2 Rf2+ 114. Bfg2
Rxg2+ 115. Kh3 Rg3+ 116. Kh4 Rg4+ 117. Kh5 Rg5+ 118. Kh6 Rg6+ 119. Kh7 Rg7+
120. Kh8 Rh7+ 121. Kg8 Rg7+ 122. Kf8 Rg8+ 123. Kf7 Rf8+ 124. Kg6 Rf6+ 125. Kh5
Rf5+ 126. Kh4 Rf4+ 127. Kh3 Rf3+ 128. Kh2 Rf2+ 129. Bg2 Rxg2+ 130. Kh3 Rg3+
131. Kh4 Rg4+ 132. Kh5 Rg5+ 133. Kh6 Rg6+ 134. Kh7 Rg7+ 135. Kh8 Rh7+ 136. Kg8
Rg7+ 137. Kf8 Rg8+ 138. Kf7 Rf8+ 139. Kg6 Rf6+ 140. Kh5 Rf5+ 141. Kh4 Rf4+ 142.
Kh3 Rf3+ 143. Kh2 Rf2+ 144. Kh1 Rh2+ 145. Kg1 Rg2+ 146. Kf1 Rf2+ 147. Ke1 Re2+
148. Kd1 Rd2+ 149. Kc1 Rc2+ 150. Kb1 Rb2+ 151. Ka1 Rb1+ 152. Ka2 Rb2+ 153. Ka3
Rb3+ 154. Ka4 Ra3+ 155. Kb4 Ra4+ 156. Kc3 Rc4+ 157. Kd3 Rd4+ 158. Ke2 Re4+ 159.
Kf1 Rf4+ 160. Bf2 Rxf2+ 161. Ke1 Re2+ 162. Kd1 Rd2+ 163. Kc1 Rc2+ 164. Kb1 Rb2+
165. Ka1 Rb1+ 166. Ka2 Rb2+ 167. Ka3 Rb3+ 168. Ka4 Ra3+ 169. Kb4 Rb3+ 170. Kc5
Rc3+ 171. Kb6 Rxc6+ 172. Qxc6+ Kb8 173. Re8# 1-0
[/pgn]

Backward with nullmove- less SF works rather quickly about 120 moves, then it's getting more and more stuck because of hash- boundaries at my hardware (32G hash were used).

At position after 50.Kg8:

k5K1/4R2r/2PBQ3/1RBB4/8/8/4N3/4NB1B b - - 0 1

Analysis by Stockfish-MOJO 281120:

50...Tg7+ 51.Kf8 Tg8+ 52.Kf7 Tf8+ 53.Kg6 Tf6+ 54.Kg5 Tf5+ 55.Kg4 Tf4+ 56.Kh3 Tf3+ 57.Lg3 Txg3+ 58.Kh4 Tg4+ 59.Kh5 Tg5+ 60.Kh6 Tg6+ 61.Kh7 Tg7+ 62.Kh8 Th7+ 63.Kg8 Tg7+ 64.Kf8 Tg8+ 65.Kf7 Tf8+ 66.Kg6 Tf6+ 67.Kg5 Tf5+ 68.Kg4 Tf4+ 69.Kh3 Tf3+ 70.Sg3 Txg3+ 71.Kh4 Tg4+ 72.Kh5 Tg5+ 73.Kh6 Tg6+ 74.Kh7 Tg7+ 75.Kh8 Th7+ 76.Kg8 Tg7+ 77.Kf8 Tg8+ 78.Kf7 Tf8+ 79.Kg6 Tf6+ 80.Kh5 Tf5+ 81.Kh4 Tf4+ 82.Kh3 Tf3+ 83.Kh2 Tf2+ 84.Ldg2 Txg2+ 85.Kh3 Tg3+ 86.Kh4 Tg4+ 87.Kh5 Tg5+ 88.Kh6 Tg6+ 89.Kh7 Tg7+ 90.Kh8 Th7+ 91.Kg8 Tg7+ 92.Kf8 Tg8+ 93.Kf7 Tf8+ 94.Kg6 Tf6+ 95.Kh5 Tf5+ 96.Kg4 Tf4+ 97.Kg3 Tf3+ 98.Kh2 Tf2+ 99.Lfg2 Txg2+ 100.Kh3 Tg3+ 101.Kh4 Tg4+ 102.Kh5 Tg5+ 103.Kh6 Tg6+ 104.Kh7 Tg7+ 105.Kh8 Th7+ 106.Kg8 Tg7+ 107.Kf8 Tg8+ 108.Kf7 Tf8+ 109.Kg6 Tf6+ 110.Kh5 Tf5+ 111.Kh4 Tf4+ 112.Kh3 Tf3+ 113.Kh2 Tf2+ 114.Lg2 Txg2+ 115.Kh3 Tg3+ 116.Kh4 Tg4+ 117.Kh5 Tg5+ 118.Kh6 Tg6+ 119.Kh7 Tg7+ 120.Kh8 Th7+ 121.Kg8 Tg7+ 122.Kf8 Tg8+ 123.Kf7 Tf8+ 124.Kg6 Tf6+ 125.Kh5 Tf5+ 126.Kh4 Tf4+ 127.Kg3
+- (#123) Tiefe: 151/160 00:00:00 2341kN

So let's suppose the first 50 moves will be as correct as the last 123 are regards

[Spliffjiffer]

as i didnt broke my head as u2 (lol, thx very much for all your efforts and analysis and the great positions), its pretty easy to show that Hobacle's solution is at least not wrong and all other moves by black loose quicker (by maintaing his maneuvering only of course but i heavily doubt that there is a faster maneuvering)

first: from move 49...Rh7 to 12...Rxg4 its trivial to check all black moves inbetween to see they loose very quickly (just use SF eg)

second: the only move to check seriously is 11...Rh5+ (instead of 11...Rf4+) as mentioned already...
11...Rh5+? 12.Kg4 Rg5+ 13.Kf3 Rf5+ 14.Nf4 Rxf4+ 15.Ke2 Rxf2 16.Kd3 Rd2+ 17.Ke4 Rd4 18.Kf5 Rf4+ 19.Kg5 Rf5+ 20.Kh4 Rf4+ 21.Bg4 Rxg4 22.Kh5 Rg5+ 23.Kh6 Rg6+ 24.Kh7 Rg7+ 25.Kh8 Rh7+ 26.Kg8 Rg7+ 27.Kf8 Rg8+ 28.Kf7 Rf8+ 29.Kg6 Rf6+ 30.Kg5 Rf5+ 31.Kg4 Rf4+ 32.Kh3 (until here every black move was trivial again which can be easily checked by SF eg...now there are 2 alteratives for black again...)
32...Rf3+! 33.Bg3 Rxg3+ (-mate in 125, easily prooven by ChestUCI with the parameters i gave already before but i will add them again on the end of this post)
and 32...Rh4+? 33.Kg2 Rxh2+ (-mate in 100, easy again with ChestUCI and the given parameters)

third: all black moves before move 11 are trivial

so Hobacle's solution works by 100% (given that Peter's MOJO got it right)

the only thing that is still not proven is that there is no other maneuvering by white that mates faster which i honestly doubt

here the ChestUCI settings again: do NOT forget to check "defender moves" to enabled to be able to confirm the stuff i wrote above

HashSize: 2048
ProblemType: Mate
SearchDepth: 126
SearchMode: Special
ChecksOnly: 0
ThreatDeath: 3
ThreatRange: 3
KingSquares: 3
PieceLimit: 2
MaxMoves: 14


best wishes, Peer

[Ajedrecista]

Hello:

Here is another one found in EG magazine few years ago.

[d]kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

This one I have stored as from I.Chuiko 1969.
SF without nullmove pruning get's it quickly as for winning move and eval.
With a little Forward- Backward:

kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

Analysis by Stockfish-MOJO 281120 01120:

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.Ke8 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 Rd5 65.Kxe4 Rh5 66.c8Q Rh4+ 67.Bf4+ Ka7 68.Qb7#
+- (#67) Depth: 152/134 00:01:41 1894MN

Same DTM as in my database regards

Indeed! Thanks to both of you, I could find the problem at EG magazine No 23 Vol II (February 1971), problem No. 1258 (pages 208 and 209):

http://www.arves.org/arves/images/PDF/EG_PDF/eg23.pdf

Composer: Iosef Vladimirovich Chuiko.

------------

Going on topic with the original post: Hobacle seems to be doing a great job. Congratulations!

Regards from Spain.

Ajedrecista.

[peter]

here the ChestUCI settings again: do NOT forget to check "defender moves" to enabled to be able to confirm the stuff i wrote above

HashSize: 2048
ProblemType: Mate
SearchDepth: 126
SearchMode: Special
ChecksOnly: 0
ThreatDeath: 3
ThreatRange: 3
KingSquares: 3
PieceLimit: 2
MaxMoves: 14

Instead of the defender moves I'll take the position after 1...Rg4+. Had a first one run already but by mistake I reduced the KingSquares too much.
Yet shouldn't 2 be enough anyhow?

[Spliffjiffer]

yes, if u check only the last 10 moves or so (until the checkmate) its enough to have kingsquares set to 1 or 2 (as far as i can remember) but if you check the last say 20 moves to checkmate u need already 3 kingsquares to confirm yout MOJO analysis...anyting deeper in the tree needs at least these 3 ks as well at the least....the point of my "defender moves" is that Chest does not find 33. Bg3 (in the inferior 11...Rh5+ line i gave above) in reasonable time because it checks all kind of other moves instead...i dont get it eighter but one move later (move 34 onwards) it solvees these positions within seconds, hm,sprachlos...also after the 32...Rh4+? 33. Kg2 Rxh2+ line which is only -mate 100, it needs about 6 minutes here but its a halfway reasonable time with high chances to be the optimal mate imo but not sure of course

[Vinvin]

Here is another one found in EG magazine few years ago.

[d]kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

Posted 5 years ago : http://www.talkchess.com/forum3/viewtop ... 43#p671443