8 hard positions from the Chest database

Discussion of anything and everything relating to chess playing software and machines.

Moderators: hgm, Rebel, chrisw

peter
Posts: 3188
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: 8 hard positions from the Chest database

Post by peter »

Dann Corbit wrote: Fri Mar 29, 2024 7:39 pm These are the only 8 positions for which I have not found a checkmate solution:
[d]2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - acd 44; bm Kf4; ce 630; c2 "#23;"; pm Kf4; pv Kf4; id "ChestDB.06301";
Having many positions in one thread always makes it difficult to follow all the postings to different single ones of them.
Haven't seen anybody dealing with this first one nearer, couldn't find another one source but Chest- database so far neither and don't come even near to DTM 23 with some Forward- Backward with Huntsman, Chest and Gustav too seem not to stand a chance with given #23 and the very starting position, tried automatic parameters so far only.

Here's the shortest line to mate I got so far, backward to about 15th move DTM- output can be kept in hash of 32G and 30 threads

[pgn]
[Event "1.Kf4"]
[Site "?"]
[Date "2024.03.22"]
[Round "40"]
[White "Chest, .epd"]
[Black "6301, #23?"]
[Result "1-0"]
[SetUp "1"]
[FEN "2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1"]
[PlyCount "87"]
[EventDate "2024.??.??"]

1. Kf4 Nc1 2. dxc3 a2 3. Bxa2 Ne2+ 4. Kg5 bxc3 5. Bb1 Bd7 6. Qc4 Bxc6 7. Qe6 Rc7 8. Bd3 Bf3 9. Qe3 c2 10. Bxc2 Rxc2 11. Qxf3 Rc3 12. Qh1+ Kd2 13. Qd5+ Rd3 14. Qa5+ Nc3 15. Kg6 Rg3+ 16. Kf7 Kd3 17. b4 Ke4 18. b5 Nd5 19. Qa8 Rb3 20. Kxg7 Rg3+ 21. Kf7 Rb3 22. f6 Rf3 23. Qa4+ Ke5 24. Qa1+ Kd6 25. Qa6+ Ke5 26. Qe6+ Kd4 27. Qg4+ Ke3 28. Qxf3+ Kxf3 29. Kg7 Ke4 30. f7 Nc7 31. b6 Ne6+ 32. Kg8 Nc5 33. f8=Q Kd5 34. Qe8 Kd6 35. Qc8 Ne4 36. Qc7+ Ke6 37. Qf7+ Ke5 38. b7 Nf6+ 39. Kh8 Nd5 40. b8=Q+ Ke4 41. Qe6+ Kf3 42. Qxd5+ Kf2 43. Qd2+ Kg1 44. Qb1# 1-0
[/pgn]
Peter.
acase
Posts: 990
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: 8 hard positions from the Chest database

Post by acase »

The best I could come up with for the mate in 64 was a mate in 66, once again there might be some place where I messed up at but at least we know how it works:

[pgn][Event "Mate in 66"]
[Site "Columbus, Ohio"]
[Date "2023.04.26"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/p1p3Pr/p1p2P2/7p/7k/6p1/p1p3P1/rbK5 w - - 0 1"]
[Time "17:13:57"]
[TimeControl "0"]
[Termination "normal"]
[PlyCount "131"]
[WhiteType "human"]
[BlackType "human"]

1. f7 Rxg7 2. f8=Q Rg5 (2... Rg4 3. Qf6+ Rg5 4. Qe7 a5 5. Qf6 Kg4 6. Qf3+ Kh4 7.
Qf4+ Rg4 8. Qf6+ Rg5 9. Qe7 c5 10. Qf6 Kg4 11. Qf3+ Kh4 12. Qf4+ Rg4 13. Qf6+
Rg5 14. Qe7 c6 15. Qf6 Kg4 16. Qf3+ Kh4 17. Qf4+ Rg4 18. Qf6+ Rg5 19. Qe7 a4 20.
Qf6 Kg4 21. Qf3+ Kh4 22. Qf4+ Rg4 23. Qf6+ Rg5 24. Qe7 a6 25. Qf6 Kg4 26. Qf3+
Kh4 27. Qf4+ Rg4 28. Qf6+ Rg5 29. Qe7 a3 30. Qf6 Kg4 31. Qf3+ Kh4 32. Qf4+ Rg4
33. Qf6+ Rg5 34. Qe7 a5 35. Qf6 Kg4 36. Qf3+ Kh4 37. Qf4+ Rg4 38. Qf6+ Rg5 39.
Qe7 a4 40. Qf8 Kg4 41. Qf3+ Kh4 42. Qf4+ Rg4 43. Qf6+ Rg5 44. Qe7 c4 45. Qf6 Kg4
46. Qf3+ Kh4 47. Qf4+ Rg4 48. Qf6+ Rg5 49. Qe7 c5 50. Qf6 Kg4 51. Qf3+ Kh4 52.
Qf4+ Rg4 53. Qf6+ Rg5 54. Qe7 c3 55. Qf6 Kg4 56. Qf3+ Kh4 57. Qf4+ Rg4 58. Qf6+
Rg5 59. Qe7 c4 60. Qf6 Kg4 61. Qf3+ Kh4 62. Qf4+ Rg4 63. Qf6+ Rg5 64. Qe7 Kg4
65. Qe4#) (2... Rg6 3. Qf4+ Rg4 4. Qf6+ Rg5 5. Qe7 a5 6. Qf6 Kg4 7. Qf3+ Kh4 8.
Qf4+ Rg4 9. Qf6+ Rg5 10. Qe7 c5 11. Qf6 Kg4 12. Qf3+ Kh4 13. Qf4+ Rg4 14. Qf6+
Rg5 15. Qe7 c6 16. Qf6 Kg4 17. Qf3+ Kh4 18. Qf4+ Rg4 19. Qf6+ Rg5 20. Qe7 a4 21.
Qf6 Kg4 22. Qf3+ Kh4 23. Qf4+ Rg4 24. Qf6+ Rg5 25. Qe7 a3 26. Qf6 Kg4 27. Qf3+
Kh4 28. Qf4+ Rg4 29. Qf6+ Rg5 30. Qe7 a6 31. Qf6 Kg4 32. Qf3+ Kh4 33. Qf4+ Rg4
34. Qf6+ Rg5 35. Qe7 a5 36. Qf6 Kg4 37. Qf3+ Kh4 38. Qf4+ Rg4 39. Qf6+ Rg5 40.
Qe7 a4 41. Qf6 Kg4 42. Qf3+ Kh4 43. Qf4+ Rg4 44. Qf6+ Rg5 45. Qe7 c4 46. Qf6 Kg4
47. Qf3+ Kh4 48. Qf4+ Rg4 49. Qf6+ Rg5 50. Qe7 c3 51. Qf6 Kg4 52. Qf3+ Kh4 53.
Qf4+ Rg4 54. Qf6+ Rg5 55. Qe7 c5 56. Qf6 Kg4 57. Qf3+ Kh4 58. Qf4+ Rg4 59. Qf6+
Rg5 60. Qe7 c4 61. Qf6 Kg4 62. Qf3+ Kh4 63. Qf4+ Rg4 64. Qf6+ Rg5 65. Qe7 Kg4
66. Qe4#) (2... Kg5 3. Qxg7+ Kf5 4. Qh6 Kg4 5. Qg6+ Kf4 6.Qxh5 c5 7. Qf3+ Ke5 8. Qxg3+ Kd4 9. Qf3 c4 10. g4 Kc5 11. g5 a5 12. g6 a6 13. g7 a4 14. g8=Q a3 15. Qgf8+ Kd4 16. Qe7 a5 17. Qee3#) 3. Qf4+ Rg4 4. Qf6+ Rg5 5.
Qe7 c5 6. Qf6 Kg4 7. Qf3+ Kh4 8. Qf4+ Rg4 9. Qf6+ Rg5 10. Qe7 c6 11. Qf6 Kg4 12.
Qf3+ Kh4 13. Qf4+ Rg4 14. Qf6+ Rg5 15. Qe7 c4 16. Qf6 Kg4 17. Qf3+ Kh4 18. Qf4+
Rg4 19. Qf6+ Rg5 20. Qe7 c3 21. Qf6 Kg4 22. Qf3+ Kh4 23. Qf4+ Rg4 24. Qf6+ Rg5
25. Qe7 a5 26. Qf6 Kg4 27. Qf3+ Kh4 28. Qf4+ Rg4 29. Qf6+ Rg5 30. Qe7 a4 31. Qf6
Kg4 32. Qf3+ Kh4 33. Qf4+ Rg4 34. Qf6+ Rg5 35. Qe7 a6 36. Qf6 Kg4 37. Qf3+ Kh4
38. Qf4+ Rg4 39. Qf6+ Rg5 40. Qe7 a5 41. Qf6 Kg4 42. Qf3+ Kh4 43. Qf4+ Rg4 44.
Qf6+ Rg5 45. Qe7 a3 46. Qf6 Kg4 47. Qf3+ Kh4 48. Qf4+ Rg4 49. Qf6+ Rg5 50. Qe7
a4 51. Qf6 Kg4 52. Qf3+ Kh4 53. Qf4+ Rg4 54. Qf6+ Rg5 55. Qe7 c5 56. Qf6 Kg4 57.
Qf3+ Kh4 58. Qf4+ Rg4 59. Qf6+ Rg5 60. Qe7 c4 61. Qf6 Kg4 62. Qf3+ Kh4 63. Qf4+
Rg4 64. Qf6+ Rg5 65. Qe7 Kg4 66. Qe4# 1-0[/pgn]
peter
Posts: 3188
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: 8 hard positions from the Chest database

Post by peter »

peter wrote: Sat Mar 30, 2024 12:39 pm
Dann Corbit wrote: Fri Mar 29, 2024 7:39 pm These are the only 8 positions for which I have not found a checkmate solution:
[d]2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - acd 44; bm Kf4; ce 630; c2 "#23;"; pm Kf4; pv Kf4; id "ChestDB.06301";
Maybe not only DTM but bm could be wrong too?
Sting favors 1.Qe6, Huntsman get's this output with some Forward- Backward from and to these first 5 moves

2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1
1. Qe6 Bf7 2. Qxc8 cxd2 3. Bc2 Nc3+ 4. Ke3 d1=Q 5. Bxd1 Kxd1

[d]2Q5/5bp1/2P5/5P2/1p6/pPn1K3/8/3k4 w - - 0 1

Analysis by The Huntsman 1:

6.c7 Kc2 7.Qb7 a2 8.Qa6 Kb2 9.c8Q a1Q 10.Qxa1+ Kxa1 11.Qf8 Bh5 12.Kd3 Kb2 13.Qxb4 Na2 14.Qb7 Nc1+ 15.Kd2 Nxb3+ 16.Kd3 Be2+ 17.Kxe2 Kc3 18.Qxg7+ Kc4 19.Ke3 Nc5 20.Qd4+ Kb5 21.Qd5 Kb6 22.f6 Na6 23.f7 Nc7 24.Qd6+ Kb5 25.Qxc7 Ka4 26.f8Q Kb3 27.Qfb8+ Ka3 28.Qca7#
Depth: 63/46 00:00:00 13858kN
Peter.
peter
Posts: 3188
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: 8 hard positions from the Chest database

Post by peter »

peter wrote: Sat Mar 30, 2024 3:08 pm
peter wrote: Sat Mar 30, 2024 12:39 pm
Dann Corbit wrote: Fri Mar 29, 2024 7:39 pm These are the only 8 positions for which I have not found a checkmate solution:
[d]2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - acd 44; bm Kf4; ce 630; c2 "#23;"; pm Kf4; pv Kf4; id "ChestDB.06301";
Maybe not only DTM but bm could be wrong too?
Sting favors 1.Qe6, Huntsman get's this output with some Forward- Backward from and to these first 5 moves

2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1
1. Qe6 Bf7 2. Qxc8 cxd2 3. Bc2 Nc3+ 4. Ke3 d1=Q 5. Bxd1 Kxd1

[d]2Q5/5bp1/2P5/5P2/1p6/pPn1K3/8/3k4 w - - 0 1

Analysis by The Huntsman 1:

6.c7 Kc2 7.Qb7 a2 8.Qa6 Kb2 9.c8Q a1Q 10.Qxa1+ Kxa1 11.Qf8 Bh5 12.Kd3 Kb2 13.Qxb4 Na2 14.Qb7 Nc1+ 15.Kd2 Nxb3+ 16.Kd3 Be2+ 17.Kxe2 Kc3 18.Qxg7+ Kc4 19.Ke3 Nc5 20.Qd4+ Kb5 21.Qd5 Kb6 22.f6 Na6 23.f7 Nc7 24.Qd6+ Kb5 25.Qxc7 Ka4 26.f8Q Kb3 27.Qfb8+ Ka3 28.Qca7#
Depth: 63/46 00:00:00 13858kN
After 1.Qe6 Bf7:

[d]2r5/5bp1/2P1Q3/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1

Analysis by The Huntsman 1:

2.Qxc8 cxd2 3.Bc2 Nc3+ 4.Ke3 a2 5.Qa6 Be8 6.c7 Bd7 7.Qa8 d1N+ 8.Bxd1 Nxd1+ 9.Kd4 Nc3 10.Kc5 Kd2 11.Kxb4 Bxf5 12.Qg2+ Ne2 13.Qxg7 Bc8 14.Qb2+ Ke3 15.Qxa2 Bg4 16.Qa6 Ng3 17.Kc5 Ne2 18.c8Q Bxc8 19.Qxc8 Kf4 20.Kc4 Kf3 21.Qf5+ Ke3 22.Qg5+ Kf3 23.b4 Ng3 24.b5 Ne4 25.Qd5 Ke3 26.Qd4+ Kf3 27.b6 Ng3 28.Qd3+ Kg4 29.b7 Kh4 30.b8Q Nh5 31.Qe4+ Kh3 32.Qf3+ Kh4 33.Qh2+ Kg5 34.Qhxh5#
Depth: 60/66 00:01:00 2992MN

Output with even shorter DTM I get after 1...Bxc6, 1...Rxc6, 1...Kd1, 1...Bh5 but to keep all these and other alternatives at 1st move of Black's in 32G hash in reasonable hardware- time together with 1st move of White's I gave up trying. One more full move backward to original starting position I'm leaving for good, regards
Last edited by peter on Sat Mar 30, 2024 8:37 pm, edited 2 times in total.
Peter.
Dann Corbit
Posts: 12576
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: 8 hard positions from the Chest database

Post by Dann Corbit »

I would not be surprised if there were many errors.
Thanks for all the efforts.
For the first two problems addressed, I analyzed the following positions, mostly to fill the hash:

Code: Select all

3k4/KP2p3/2p1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm b8=Q#; ce 32766; dm 1; pm b8=Q#; 
Q1Q5/4p3/1k2P3/6p1/2P3Pp/7P/1p1K4/8 w - - acd 80; bm Qaa6+; ce 32766; dm 1; pm Qaa6+; 
8/1Pk1p3/K1p1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Ka7; ce 32764; dm 2; pm Ka7; c9 "HHdbVI.1156970.063a.57979"; 
Q7/2P1p3/1k2P3/6p1/2P3Pp/1p5P/3K4/8 w - - acd 80; bm c8=Q; ce 32764; dm 2; pm c8=Q; 
1k6/4p3/KPp1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm b7; ce 32762; dm 3; pm b7; c9 "HHdbVI.1156968.062a.57979"; 
8/PkP1p3/1P2P3/6p1/2P3Pp/1p5P/3K4/8 w - - acd 80; bm c8=Q+; ce 32762; dm 3; pm c8=Q+; 
k7/4p3/1Pp1P3/K1P5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Ka6; ce 32760; dm 4; pm Ka6; c9 "HHdbVI.1156966.061a.57979"; 
k7/P3p3/1PP1P3/6p1/2P3Pp/1p5P/3K4/8 w - - acd 80; bm c7; ce 32760; dm 4; pm c7; 
8/Pk2p3/1Pp1P3/K1P5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm a8=Q+ a8=R; ce 32758; dm 5; pm a8=Q+ a8=R; c9 "HHdbVI.1156964.060a.57979"; 
k7/P3p3/1PP1P3/6p1/1p4Pp/2P4P/3K4/8 w - - acd 80; bm c4; ce 32758; dm 5; pm c4; 
k7/P3p3/1P2P3/1pP3p1/6Pp/2P4P/3K4/8 w - - acd 80; bm c6; ce 32756; dm 6; pm c6; 
k7/P3p3/1Pp1P3/2P5/1Kp3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Ka5; ce 32756; dm 6; pm Ka5; c9 "HHdbVI.1156962.059a.57979"; 
8/Pk2p3/1Pp1P3/K1P5/1pp3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Kxb4; ce 32754; dm 7; pm Kxb4; c9 "HHdbVI.1156960.058a.57979"; 
k7/P3p3/1Pp1P3/1PP3p1/6Pp/2P4P/3p4/2K5 w - - acd 80; bm Kxd2; ce 32754; dm 7; pm Kxd2; 
8/Pk2p3/1Pp1P3/1pP5/1Kp3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Ka5; ce 32752; dm 8; pm Ka5; c9 "HHdbVI.1156958.057a.57979"; 
k7/P3p3/1Pp1P3/2P3p1/1P4Pp/2Pp3P/8/2K5 w - - acd 80; bm b5; ce 32752; dm 8; pm b5; 
8/Pk2p3/1Pp1P3/2P3p1/1P4Pp/2pp3P/3P4/2K5 w - - acd 80; bm dxc3; ce 32750; dm 9; pm dxc3; 
k7/P3p3/1Pp1P3/1pP5/2p3p1/K1Pp2Pp/3P3P/8 w - - acd 999; bm Kb4; ce 32750; dm 9; pm Kb4; c9 "HHdbVI.1156956.056a.57979"; 
8/Pk2p3/1Pp1P3/1pP5/2p3p1/2Pp2Pp/1K1P3P/8 w - - acd 999; bm Ka3; ce 32748; dm 10; pm Ka3; c9 "HHdbVI.1156954.055a.57979"; 
8/Pk2p3/1Pp1P3/2P3p1/1pp3Pp/2Pp3P/3P4/2K5 w - - acd 80; bm cxb4; ce 32748; dm 10; pm cxb4; 
k7/P3p3/1Pp1P3/1pP5/2p3p1/2Pp2Pp/K2P3P/8 w - - acd 999; bm Kb2; ce 32746; dm 11; pm Kb2; c9 "HHdbVI.1156952.054a.57979"; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3Pp/2Pp3P/3P4/1K6 w - - acd 80; bm Kc1; ce 32744; dm 12; pm Kc1; 
k7/P3p3/1Pp1P1p1/2P3p1/1P5p/2pp1P1P/3P4/1K6 w - - acd 80; bm Kc1; ce 32744; dm 12; pm Kc1; 
k7/P3p3/1Pp1P1p1/2P3p1/1pp4p/2Pp1P1P/3P4/1K6 w - - acd 80; bm cxb4; ce 32742; dm 13; pm cxb4; 
k7/P3p3/1Pp1P3/1pP3p1/2p3Pp/2Pp3P/1K1P4/8 w - - acd 80; bm Kb1; ce 32742; dm 13; pm Kb1; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3Pp/K1Pp3P/3P4/8 w - - acd 80; bm Kb2; ce 32740; dm 14; pm Kb2; 
8/Pk2p3/1Pp1P3/1pP5/2p3p1/K1Pp2Pp/3P3P/8 w - - acd 999; bm Ka2 Kb2; ce 32740; dm 14; pm Ka2 Kb2; c9 "HHdbVI.1156950.053a.57979"; 
k7/P3p3/1Pp1P3/1pP3p1/1Kp3Pp/2Pp3P/3P4/8 w - - acd 80; bm Ka3; ce 32738; dm 15; pm Ka3; 
k7/P3p3/1Pp1P3/1pP5/1Kp3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Ka3; ce 32738; dm 15; pm Ka3; c9 "HHdbVI.1156948.052a.57979"; 
8/Pk2p3/1Pp1P3/KpP3p1/2p3Pp/2Pp3P/3P4/8 w - - acd 80; bm Kb4; ce 32736; dm 16; pm Kb4; 
8/Pk2p3/1Pp1P3/KpP5/2p3p1/2Pp2Pp/3P3P/8 w - - acd 999; bm Kb4; ce 32736; dm 16; pm Kb4; c9 "HHdbVI.1156946.051a.57979"; 
8/Pk2p3/1Pp1P1p1/KpP5/2p3pp/2Pp1P1P/3P4/8 w - - acd 80; bm fxg4; ce 32734; dm 17; pm fxg4; 
8/Pk2p3/1Pp1P3/KpP3p1/2p5/2Pp2pp/3P1P1P/8 w - - acd 999; bm fxg3; ce 32734; dm 17; pm fxg3; c9 "HHdbVI.1156944.050a.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 w - - acd 80; bm Ka5; ce 32732; dm 18; pm Ka5; 
8/Pk2p3/1Pp1P3/1pP3p1/1Kp3p1/2Pp3p/3P1P1P/8 w - - acd 999; bm Ka5; ce 32732; dm 18; pm Ka5; c9 "HHdbVI.1156942.049a.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/K1Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32730; dm 19; pm Kb4; 
k7/P3p3/1Pp1P3/1pP3p1/2p3p1/K1Pp3p/3P1P1P/8 w - - acd 999; bm Kb4; ce 32730; dm 19; pm Kb4; c9 "HHdbVI.1156940.048a.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 w - - acd 80; bm Ka3; ce 32728; dm 20; pm Ka3; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3p1/2Pp3p/1K1P1P1P/8 w - - acd 999; bm Ka3; ce 32728; dm 20; pm Ka3; c9 "HHdbVI.1156938.047a.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/K2P4/8 w - - acd 80; bm Kb2; ce 32726; dm 21; pm Kb2; 
k7/P3p3/1Pp1P3/1pP3p1/2p3p1/2Pp3p/K2P1P1P/8 w - - acd 999; bm Kb2; ce 32726; dm 21; pm Kb2; c9 "HHdbVI.1156936.046a.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/2p4p/K1Pp1P1P/3P4/8 w - - acd 80; bm Ka2; ce 32724; dm 22; pm Ka2; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3p1/K1Pp3p/3P1P1P/8 w - - acd 70; bm Ka2; ce 32724; dm 22; pm Ka2; c9 "HHdbVI.1156934.045a.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 w - - acd 80; bm Ka3; ce 32722; dm 23; pm Ka3; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 w - - acd 80; bm Kc1; ce 32722; dm 23; pm Kc1; 
k7/P3p3/1Pp1P3/1pP3p1/1Kp3p1/2Pp3p/3P1P1P/8 w - - acd 70; bm Ka3; ce 32722; dm 23; pm Ka3; c9 "HHdbVI.1156932.044a.57979"; 
8/Pk2p3/1Pp1P1p1/KpP3p1/2p4p/2Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32720; dm 24; pm Kb4; 
8/Pk2p3/1Pp1P3/KpP3p1/2p3p1/2Pp3p/3P1P1P/8 w - - acd 70; bm Kb4; ce 32720; dm 24; pm Kb4; c9 "HHdbVI.1156930.043a.57979"; 
8/Pk2p1p1/1Pp1P3/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 w - - acd 80; bm Ka5; ce 32718; dm 25; pm Ka5; 
8/Pk2p3/1Pp1P1p1/1pP3pp/1Kp5/2Pp1P1P/3P4/8 w - - acd 80; bm Ka5; ce 32718; dm 25; pm Ka5; 
8/Pk2p3/1Pp1P3/1pP3p1/1Kp3pp/2Pp4/3P1P1P/8 w - - acd 70; bm Ka5; ce 32718; dm 25; pm Ka5; c9 "HHdbVI.1156928.042a.57979"; 
1Rn4k/n1p5/p2p1N1P/2bP3p/8/p1p1P2p/P1P1PP1P/6K1 w - - acd 70; bm Rb1; ce 32716; dm 26; pm Rb1; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/K1Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32716; dm 26; pm Kb4; 
k7/P3p3/1Pp1P1p1/1pP3pp/2p5/K1Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32716; dm 26; pm Kb4; 
k7/P3p3/1Pp1P3/1pP3p1/2p3pp/K1Pp4/3P1P1P/8 w - - acd 70; bm Kb4; ce 32716; dm 26; pm Kb4; c9 "HHdbVI.1156926.041a.57979"; 
1Rn4k/n1p5/pb1p1N1P/3P3p/8/p1p1P2p/P1P1PP1P/7K w - - acd 70; bm Kg1; ce 32714; dm 27; pm Kg1; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 w - - acd 80; bm Ka3; ce 32714; dm 27; pm Ka3; 
8/Pk2p3/1Pp1P1p1/1pP3pp/2p5/2Pp1P1P/1K1P4/8 w - - acd 80; bm Ka3; ce 32714; dm 27; pm Ka3; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3pp/2Pp4/1K1P1P1P/8 w - - acd 70; bm Ka3; ce 32714; dm 27; pm Ka3; c9 "HHdbVI.1156924.040a.57979"; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/3P4/1K6 w - - acd 80; bm Kb2; ce 32712; dm 28; pm Kb2; 
k7/P3p3/1Pp1P1p1/1pP3pp/2p5/2Pp1P1P/K2P4/8 w - - acd 80; bm Kb2; ce 32712; dm 28; pm Kb2; 
k7/P3p3/1Pp1P3/1pP3p1/2p3pp/2Pp4/K2P1P1P/8 w - - acd 60; bm Kb2; ce 32712; dm 28; pm Kb2; c9 "HHdbVI.1156922.039a.57979"; 
R1n4k/n1p5/pb1p1N1P/3P3p/7p/p1p1P3/P1P1PP1P/7K w - - acd 70; bm Rb8; ce 32712; c7 "No. 309494 (id: P1402334) Rotenberg, Jacques; Loustau, Jean-Marc source 1: Phenix, 1993-1994 stipulation: #34 solution: 1.Tb8! h3 2.Kg1 Lc5 3.Kf1 Lb6 4.Ke1 Lc5 5.Kd1 Lb6 6.Kc1 Lc5 7.Kb1 Lb6 8.Ka1 h4 9.Kb1 Lc5 10.Kc1 Lb6 11.Kd1 Lc5 12.Ke1 Lb6 13.Kf1 Lc5 14.Kg1 Lb6 15.Kh1 a5 16.Kg1 Lc5 17.Kf1 Lb6 18.Ke1 Lc5 19.Kd1 Lb6 20.Kc1 Lc5 21.Kb1 Lb6 22.Ka1 a4 23.Kb1 Lc5 24.Kc1 Lb6 25.Kd1 Lc5 26.Ke1 Lb6 27.Kf1 Lc5 28.Kg1 Lb6 29.Kh1 Lc5! 30.Tb1 Ld4 31.exd4 Se7 32.Tg1 Sg6 33.Txg6 ...34.Tg8#"; dm 28; pm Rb8; id "ChestDB.06430"; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/3P4/2K5 w - - acd 80; bm Kb1; ce 32710; dm 29; pm Kb1; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/K1Pp1P1P/3P4/8 w - - acd 80; bm Ka2; ce 32710; dm 29; pm Ka2; 
8/Pk2p3/1Pp1P1p1/1pP3pp/2p5/K1Pp1P1P/3P4/8 w - - acd 80; bm Ka2; ce 32710; dm 29; pm Ka2; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3pp/K1Pp4/3P1P1P/8 w - - acd 59; bm Ka2; ce 32710; dm 29; pm Ka2; c9 "HHdbVI.1156920.038a.57979"; 
k7/P3p1p1/1Pp1P3/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 w - - acd 80; bm Ka3; ce 32708; dm 30; pm Ka3; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 w - - acd 80; bm Kb1; ce 32708; dm 30; pm Kb1; 
k7/P3p3/1Pp1P1p1/1pP3pp/1Kp5/2Pp1P1P/3P4/8 w - - acd 80; bm Ka3; ce 32708; dm 30; pm Ka3; 
k7/P3p3/1Pp1P3/1pP3p1/1Kp3pp/2Pp4/3P1P1P/8 w - - acd 61; bm Ka3; ce 32708; dm 30; pm Ka3; c9 "HHdbVI.1156918.037a.57979"; 
8/Pk2p1p1/1Pp1P3/KpP3p1/2p4p/2Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32706; dm 31; pm Kb4; 
8/Pk2p3/1Pp1P1p1/KpP3pp/2p5/2Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32706; dm 31; pm Kb4; 
8/Pk2p3/1Pp1P3/KpP3p1/2p3pp/2Pp4/3P1P1P/8 w - - acd 63; bm Kb4; ce 32706; dm 31; pm Kb4; c9 "HHdbVI.1156916.036a.57979"; 
8/Pk2p1p1/1Pp1P3/1pP3pp/1Kp5/2Pp1P1P/3P4/8 w - - acd 80; bm Ka5; ce 32704; dm 32; pm Ka5; 
8/Pk2p1p1/1Pp1P3/KpP3pp/2p5/2Pp1P2/3P3P/8 w - - acd 80; bm h3; ce 32704; dm 32; pm h3; 
8/Pk2p3/1Pp1P3/1pP3pp/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 65; bm Ka5; ce 32704; dm 32; pm Ka5; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/1Kp5/2Pp1P2/3P3P/8 w - - acd 80; bm Ka5; ce 32702; dm 33; pm Ka5; 
k7/P3p1p1/1Pp1P3/1pP3pp/2p5/K1Pp1P1P/3P4/8 w - - acd 80; bm Kb4; ce 32702; dm 33; pm Kb4; 
k7/P3p3/1Pp1P3/1pP3pp/2p3p1/K1Pp4/3P1P1P/8 w - - acd 67; bm Kb4; ce 32702; dm 33; pm Kb4; 
8/Pk2p1p1/1Pp1P3/1pP3pp/2p5/K1Pp1P2/3P3P/8 w - - acd 80; bm h3; ce 32700; dm 34; pm h3; 
8/Pk2p3/1Pp1P3/1pP3pp/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 69; bm Ka3; ce 32700; dm 34; pm Ka3; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/K1Pp1P2/3P3P/8 w - - acd 80; bm Kb4; ce 32700; dm 34; pm Kb4; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/1K1P3P/8 w - - acd 80; bm Ka3; ce 32698; dm 35; pm Ka3; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/3P3P/1K6 w - - acd 80; bm Kb2; ce 32696; dm 36; pm Kb2; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/K2P3P/8 w - - acd 80; bm Kb2; ce 32696; dm 36; pm Kb2; 
k7/P3p3/1Pp1P3/1pP3pp/2p3p1/2Pp4/K2P1P1P/8 w - - acd 73; bm Kb2; ce 32696; dm 36; pm Kb2; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/3P3P/2K5 w - - acd 75; bm Kb1; ce 32694; dm 37; pm Kb1; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/K1Pp1P2/3P3P/8 w - - acd 80; bm Ka2; ce 32694; dm 37; pm Ka2; 
8/Pk2p3/1Pp1P3/1pP3pp/2p3p1/K1Pp4/3P1P1P/8 w - - acd 75; bm Ka2; ce 32694; dm 37; pm Ka2; 
8/Pk2p3/1Pp1P3/KpP3pp/2p3p1/2Pp4/3P1P1P/8 w - - acd 77; bm Kb4; ce 32692; dm 38; pm Kb4; 
k7/P3p1p1/1Pp1P2p/1pP3p1/1Kp5/2Pp1P2/3P3P/8 w - - acd 80; bm Ka3; ce 32692; dm 38; pm Ka3; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/1K1P3P/8 w - - acd 77; bm Kc1; ce 32692; dm 38; pm Kc1; 
8/Pk2p1p1/1Pp1P2p/KpP3p1/2p5/2Pp1P2/3P3P/8 w - - acd 80; bm Kb4; ce 32690; dm 39; pm Kb4; 
8/Pk2p3/1Pp1P2p/1pP3p1/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 79; bm Ka5; ce 32690; dm 39; pm Ka5; 
k7/P3p3/1Pp1P3/1pP3pp/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 79; bm Ka3; ce 32690; dm 39; pm Ka3; 
8/Pk2p1pp/1Pp1P3/1pP3p1/1Kp5/2Pp1P2/3P3P/8 w - - acd 81; bm Ka5; ce 32688; dm 40; pm Ka5; 
k7/P3p3/1Pp1P2p/1pP3p1/2p3p1/K1Pp4/3P1P1P/8 w - - acd 81; bm Kb4; ce 32688; dm 40; pm Kb4; 
8/Pk2p3/1Pp1P2p/1pP3p1/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 83; bm Ka3; ce 32686; dm 41; pm Ka3; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/K1Pp1P2/3P3P/8 w - - acd 83; bm Kb4; ce 32686; dm 41; pm Kb4; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/1K1P3P/8 w - - acd 85; bm Ka3; ce 32684; dm 42; pm Ka3; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/2K5 w - - acd 87; bm Kb2; ce 32682; dm 43; pm Kb2; 
k7/P3p3/1Pp1P2p/1pP3p1/2p3p1/2Pp4/K2P1P1P/8 w - - acd 87; bm Kb2; ce 32682; dm 43; pm Kb2; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/3K4 w - - acd 89; bm Kc1; ce 32680; dm 44; pm Kc1; 
8/Pk2p3/1Pp1P2p/1pP3p1/2p3p1/K1Pp4/3P1P1P/8 w - - acd 91; bm Ka2; ce 32678; dm 45; pm Ka2; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/4K3 w - - acd 91; bm Kd1; ce 32678; dm 45; pm Kd1; 
k7/P3p3/1Pp1P2p/1pP3p1/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 91; bm Ka3; ce 32678; dm 45; pm Ka3; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P1K1P/8 w - - acd 93; bm Ke1; ce 32676; dm 46; pm Ke1; 
8/Pk2p3/1Pp1P2p/KpP3p1/2p3p1/2Pp4/3P1P1P/8 w - - acd 95; bm Kb4; ce 32674; dm 47; pm Kb4; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/5K2 w - - acd 95; bm Ke1; ce 32674; dm 47; pm Ke1; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1P1P/5K2 w - - acd 97; bm f3; ce 32672; dm 48; pm f3; 
8/Pk2p3/1Pp1P1pp/1pP5/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 99; bm Ka5; ce 32670; dm 49; pm Ka5; 
k7/P3p3/1Pp1P1pp/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 101; bm Kb4; ce 32668; dm 50; pm Kb4; 
8/Pk2p3/1Pp1P1pp/1pP5/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 103; bm Ka3; ce 32666; dm 51; pm Ka3; 
8/Pk2p3/1Pp1P1pp/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 105; bm Ka2; ce 32664; dm 52; pm Ka2; 
k7/P3p3/1Pp1P1pp/1pP5/2p3p1/2Pp4/K2P1P1P/8 w - - acd 105; bm Kb2; ce 32664; dm 52; pm Kb2; 
k7/P3p3/1Pp1P1pp/1pP5/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 107; bm Ka3; ce 32662; dm 53; pm Ka3; 
8/Pk2p3/1Pp1P1pp/KpP5/2p3p1/2Pp4/3P1P1P/8 w - - acd 109; bm Kb4; ce 32660; dm 54; pm Kb4; 
k7/P3p1p1/1Pp1P2p/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 117; bm Kb4; ce 32652; dm 58; pm Kb4; c9 "HHdbVI.1156870.013a.57979"; 
8/Pk2p1p1/1Pp1P2p/1pP5/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 119; bm Ka5; ce 32650; dm 59; pm Ka5; c9 "HHdbVI.1156872.014a.57979"; 
8/Pk2p1p1/1Pp1P2p/1pP5/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 119; bm Ka3; ce 32650; dm 59; pm Ka3; c9 "HHdbVI.1156868.012a.57979"; 
8/Pk2p1p1/1Pp1P2p/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 133; bm Ka2; ce 32636; dm 66; pm Ka2; c9 "HHdbVI.1156864.010a.57979"; 
k7/P3p1p1/1Pp1P2p/1pP5/2p3p1/2Pp4/K2P1P1P/8 w - - acd 133; bm Kb2; ce 32636; dm 66; pm Kb2; c9 "HHdbVI.1156866.011a.57979"; 
k7/P3p1p1/1Pp1P2p/1pP5/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 135; bm Ka3; ce 32634; dm 67; pm Ka3; c9 "HHdbVI.1156862.009a.57979"; 
8/Pk2p1p1/1Pp1P2p/KpP5/2p3p1/2Pp4/3P1P1P/8 w - - acd 137; bm Kb4; ce 32632; dm 68; pm Kb4; c9 "HHdbVI.1156860.008a.57979"; 
8/Pk2p1pp/1Pp1P3/1pP5/1Kp3p1/2Pp4/3P1P1P/8 w - - acd 139; bm Ka5; ce 32630; dm 69; pm Ka5; c9 "HHdbVI.1156858.007a.57979"; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 141; bm Kb4; ce 32628; dm 70; pm Kb4; c9 "HHdbVI.1156856.006a.57979"; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 143; bm Ka3; ce 32626; dm 71; pm Ka3; c9 "HHdbVI.1156854.005a.57979"; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/2K5 w - - acd 149; bm Kb1; ce 32620; dm 74; pm Kb1; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/K1Pp4/3P1P1P/8 w - - acd 149; bm Ka2; ce 32620; dm 74; pm Ka2; c9 "HHdbVI.1156850.003a.57979"; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/1K1P1P1P/8 w - - acd 151; bm Ka3; ce 32618; dm 75; pm Ka3; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/4K3 w - - acd 155; bm Kd1; ce 32614; dm 77; pm Kd1; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/K2P1P1P/8 w - - acd 155; bm Kb1; ce 32614; dm 77; pm Kb1; c9 "HHdbVI.1156852.004a.57979"; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1P1P/7K w - - acd 70; bm Kg2; ce 9615; pm Kg2; id "ChestDB.06542"; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1PKP/8 w - - acd 70; bm Kf1; ce 9615; pm Kf1; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/3K4 w - - acd 70; bm Kc1; ce 9615; pm Kc1; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/5K2 w - - acd 70; bm Ke1; ce 9615; pm Ke1; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1PKP/8 w - - acd 70; bm Kf1; ce 1384; pm Kf1; 
8/Pk2p1p1/1Pp1P2p/1pP5/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 70; bm Ka8; ce 0; pm Ka8; c9 "HHdbVI.1156861.008b.57979"; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1P1P/5K2 b - - acd 73; bm g4; ce -500; pm g4; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1PKP/8 b - - acd 70; bm g4; ce -1161; pm g4; 
8/Pk2p1p1/1Pp1P2p/1pP5/2p3p1/2Pp4/K2P1P1P/8 b - - acd 70; bm Ka8; ce -9615; pm Ka8; c9 "HHdbVI.1156865.010b.57979"; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 70; bm Ka8; ce -9615; pm Ka8; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/3K4 b - - acd 70; bm g6; ce -9615; pm g6; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/5K2 b - - acd 70; bm h6; ce -9615; pm h6; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/K2P1P1P/8 b - - acd 70; bm Ka8; ce -9615; pm Ka8; c9 "HHdbVI.1156851.003b.57979"; 
8/Pk2p1pp/1Pp1P3/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 70; bm Ka8; ce -9615; pm Ka8; c9 "HHdbVI.1156855.005b.57979"; 
8/Pk2p1pp/1Pp1P3/KpP5/2p3p1/2Pp4/3P1P1P/8 b - - acd 70; bm h6; ce -9615; c7 "No. 295654 (id: P1299269) Kn oppel, Jan Heribert source 1: S oslanger, No. 4, 1969 source 2: Springaren, 1962 stipulation: #66 solution: 1.Kb4 Ka8 2.Ka3 Kb7 3.Ka2 Ka8 4.Kb2 Kb7 5.Ka3 Ka8 6.Kb4 Kb7 7.Ka5 g6 8.Kb4 Ka8 9.Ka3 Kb7 10.Ka2 Ka8 11.Kb2 Kb7 12.Ka3 Ka8 13.Kb4 Kb7 14.Ka5 g5 15.Kb4 Ka8 16.Ka3 Kb7 17.Ka2 Ka8 18.Kb2 Kb7 19.Ka3 Ka8 20.Kb4 Kb7 21.Ka5 h6 22.Kb4 Ka8 23.Ka3 Kb7 24.Ka2 Ka8 25.Kb2 Kb7 26.Ka3 Ka8 27.Kb4 Kb7 28.Ka5 h5 29.Kb4 Ka8 30.Ka3 Kb7 31.Ka2 Ka8 32.Kb2 Kb7 33.Ka3 Ka8 34.Kb4 Kb7 35.Ka5 h4 36.Kb4 Ka8 37.Ka3 Kb7 38.Ka2 Ka8 39.Kb2 Kb7 40.Ka3 Ka8 41.Kb4 Kb7 42.Ka5 h3 43.Kb4 Ka8 44.Ka3 Kb7 45.Ka2 Ka8 46.Kb2 Kb7 47.Ka3 Ka8 48.Kb4 Kb7 49.Ka5 g3 50.fxg3 g4 51.Kb4 Ka8 52.Ka3 Kb7 53.Kb2 Ka8 54.Kb1 b4 55.cxb4 c3 56.Kc1 cxd2+ 57.Kxd2 Kb7 58.Kxd3 Ka8 59.b5 Kb7 60.bxc6+ Kxc6 61.a8=D+ Kxc5 62.b7 Kd5 63.b8=D+ Kxe6 64.Ke4 Kf6 65.Dh8+ Kg6 66.Dag8#"; pm h6; c9 "HHdbVI.1156859.007b.57979"; 
k7/P3p1p1/1Pp1P2p/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -9615; pm Kb7; c9 "HHdbVI.1156863.009b.57979"; 
k7/P3p1pp/1Pp1P3/1pP5/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -9615; pm Kb7; c9 "HHdbVI.1156857.006b.57979"; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 70; bm Kb7; ce -9615; pm Kb7; c9 "HHdbVI.1156853.004b.57979"; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/2K5 b - - acd 70; bm Kb7; ce -9615; pm Kb7; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/2Pp4/3P1P1P/4K3 b - - acd 70; bm g6; ce -9615; pm g6; 
k7/P3p1pp/1Pp1P3/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -9615; pm Kb7; c9 "HHdbVI.1156849.002b.57979"; 
k7/P3p1p1/1Pp1P2p/1pP5/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 143; bm Kb7; ce -32625; dm -71; pm Kb7; c9 "HHdbVI.1156867.011b.57979"; 
k7/P3p1p1/1Pp1P2p/1pP5/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 119; bm Kb7; ce -32649; dm -59; pm Kb7; c9 "HHdbVI.1156871.013b.57979"; 
8/Pk2p1p1/1Pp1P2p/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 117; bm Ka8; ce -32651; dm -58; pm Ka8; c9 "HHdbVI.1156869.012b.57979"; 
8/Pk2p1p1/1Pp1P2p/KpP5/2p3p1/2Pp4/3P1P1P/8 b - - acd 113; bm g6; ce -32655; dm -56; pm g6; c9 "HHdbVI.1156873.014b.57979"; 
8/Pk2p3/1Pp1P1pp/1pP5/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 107; bm Ka8; ce -32661; dm -53; pm Ka8; 
8/Pk2p3/1Pp1P1pp/1pP5/2p3p1/2Pp4/K2P1P1P/8 b - - acd 105; bm Ka8; ce -32663; dm -52; pm Ka8; 
k7/P3p3/1Pp1P1pp/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 105; bm Kb7; ce -32663; dm -52; pm Kb7; 
k7/P3p3/1Pp1P1pp/1pP5/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 103; bm Kb7; ce -32665; dm -51; pm Kb7; 
8/Pk2p3/1Pp1P1pp/1pP5/2p3p1/K1Pp4/3P1P1P/8 b - - acd 101; bm Ka8; ce -32667; dm -50; pm Ka8; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/5K2 b - - acd 99; bm Ka8; ce -32669; dm -49; pm Ka8; 
k7/P3p3/1Pp1P1pp/1pP5/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 99; bm Kb7; ce -32669; dm -49; pm Kb7; 
8/Pk2p3/1Pp1P1pp/KpP5/2p3p1/2Pp4/3P1P1P/8 b - - acd 97; bm h5; ce -32671; dm -48; pm h5; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P1K1P/8 b - - acd 97; bm Kb7; ce -32671; dm -48; pm Kb7; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/4K3 b - - acd 95; bm Ka8; ce -32673; dm -47; pm Ka8; 
8/Pk2p3/1Pp1P2p/1pP3p1/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 95; bm Ka8; ce -32673; dm -47; pm Ka8; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/1K1P3P/8 b - - acd 93; bm Kb7; ce -32675; dm -46; pm Kb7; 
k7/P3p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/3K4 b - - acd 93; bm Kb7; ce -32675; dm -46; pm Kb7; 
k7/P3p3/1Pp1P2p/1pP3p1/2p3p1/K1Pp4/3P1P1P/8 b - - acd 93; bm Kb7; ce -32675; dm -46; pm Kb7; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp1P2/3P3P/2K5 b - - acd 91; bm Ka8; ce -32677; dm -45; pm Ka8; 
8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/K1Pp1P2/3P3P/8 b - - acd 91; bm Ka8; ce -32677; dm -45; pm Ka8; 
8/Pk2p3/1Pp1P2p/1pP3p1/2p3p1/2Pp4/K2P1P1P/8 b - - acd 91; bm Ka8; ce -32677; dm -45; pm Ka8; 
k7/P3p1pp/1Pp1P3/1pP3p1/1Kp5/2Pp1P2/3P3P/8 b - - acd 89; bm Kb7; ce -32679; dm -44; pm Kb7; 
k7/P3p3/1Pp1P2p/1pP3p1/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 89; bm Kb7; ce -32679; dm -44; pm Kb7; 
8/Pk2p3/1Pp1P2p/1pP3p1/2p3p1/K1Pp4/3P1P1P/8 b - - acd 87; bm Ka8; ce -32681; dm -43; pm Ka8; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/1Kp5/2Pp1P2/3P3P/8 b - - acd 81; bm h5; ce -32687; dm -40; pm h5; 
8/Pk2p1pp/1Pp1P3/KpP3p1/2p5/2Pp1P2/3P3P/8 b - - acd 81; bm g6; ce -32687; dm -40; pm g6; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/K1Pp1P2/3P3P/8 b - - acd 80; bm h5; ce -32687; dm -37; pm h5; 
k7/P3p3/1Pp1P2p/1pP3p1/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 81; bm Kb7; ce -32687; dm -40; pm Kb7; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/1K1P3P/8 b - - acd 80; bm Ka8; ce -32689; dm -39; pm Ka8; 
8/Pk2p3/1Pp1P2p/KpP3p1/2p3p1/2Pp4/3P1P1P/8 b - - acd 79; bm h5; ce -32689; dm -39; pm h5; 
8/Pk2p3/1Pp1P3/1pP3pp/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 77; bm Ka8; ce -32691; dm -38; pm Ka8; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/3P3P/2K5 b - - acd 80; bm h5; ce -32691; dm -38; pm h5; 
k7/P3p3/1Pp1P3/1pP3pp/2p3p1/K1Pp4/3P1P1P/8 b - - acd 75; bm Kb7; ce -32693; dm -37; pm Kb7; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/3P3P/1K6 b - - acd 80; bm h5; ce -32695; dm -36; pm h5; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/K2P3P/8 b - - acd 80; bm Ka8; ce -32695; dm -36; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP3pp/2p3p1/2Pp4/K2P1P1P/8 b - - acd 73; bm Ka8; ce -32695; dm -36; pm Ka8; 
k7/P3p1p1/1Pp1P2p/1pP3p1/2p5/2Pp1P2/1K1P3P/8 b - - acd 80; bm Kb7; ce -32697; dm -35; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3pp/2p3p1/2Pp4/1K1P1P1P/8 b - - acd 71; bm Kb7; ce -32697; dm -35; pm Kb7; 
8/Pk2p1p1/1Pp1P2p/1pP3p1/2p5/K1Pp1P2/3P3P/8 b - - acd 80; bm h5; ce -32699; dm -34; pm h5; 
8/Pk2p3/1Pp1P3/1pP3pp/2p3p1/K1Pp4/3P1P1P/8 b - - acd 70; bm Ka8; ce -32699; dm -34; pm Ka8; 
8/Pk2p1p1/1Pp1P3/1pP3pp/2p5/K1Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32701; dm -33; pm Ka8; 
k7/P3p1p1/1Pp1P2p/1pP3p1/1Kp5/2Pp1P2/3P3P/8 b - - acd 80; bm Kb7; ce -32701; dm -33; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3pp/1Kp3p1/2Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -32701; dm -33; pm Kb7; 
8/Pk2p1p1/1Pp1P2p/KpP3p1/2p5/2Pp1P2/3P3P/8 b - - acd 80; bm g6; ce -32703; dm -32; pm g6; 
8/Pk2p3/1Pp1P3/KpP3pp/2p3p1/2Pp4/3P1P1P/8 b - - acd 70; bm h4; ce -32703; dm -32; pm h4; 
k7/P3p1p1/1Pp1P3/1pP3pp/1Kp5/2Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32703; dm -32; pm Kb7; 
8/Pk2p1p1/1Pp1P3/KpP3pp/2p5/2Pp1P1P/3P4/8 b - - acd 80; bm g6; ce -32705; dm -31; pm g6; 
8/Pk2p3/1Pp1P3/1pP3p1/1Kp3pp/2Pp4/3P1P1P/8 b - - acd 70; bm Ka8; ce -32705; dm -31; pm Ka8; c9 "HHdbVI.1156917.036b.57979"; 
8/Pk2p1p1/1Pp1P3/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32707; dm -30; pm Ka8; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 b - - acd 80; bm Ka8; ce -32707; dm -30; pm Ka8; 
8/Pk2p3/1Pp1P1p1/1pP3pp/1Kp5/2Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32707; dm -30; pm Ka8; 
k7/P3p3/1Pp1P3/1pP3p1/2p3pp/K1Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -32707; dm -30; pm Kb7; c9 "HHdbVI.1156919.037b.57979"; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3pp/2Pp4/K2P1P1P/8 b - - acd 70; bm Ka8; ce -32709; dm -29; pm Ka8; c9 "HHdbVI.1156921.038b.57979"; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/3P4/2K5 b - - acd 80; bm Kb7; ce -32709; dm -29; pm Kb7; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/K1Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32709; dm -29; pm Kb7; 
k7/P3p3/1Pp1P1p1/1pP3pp/2p5/K1Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32709; dm -29; pm Kb7; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/3P4/1K6 b - - acd 80; bm Ka8; ce -32711; dm -28; pm Ka8; 
8/Pk2p3/1Pp1P1p1/1pP3pp/2p5/2Pp1P1P/K2P4/8 b - - acd 80; bm Ka8; ce -32711; dm -28; pm Ka8; 
1Rn4k/n1p5/pb1p1N1P/3P3p/7p/p1p1P3/P1P1PP1P/7K b - - acd 70; bm h3; ce -32713; dm -27; pm h3; 
k7/P3p1p1/1Pp1P3/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 b - - acd 80; bm Kb7; ce -32713; dm -27; pm Kb7; 
k7/P3p3/1Pp1P1p1/1pP3pp/2p5/2Pp1P1P/1K1P4/8 b - - acd 80; bm Kb7; ce -32713; dm -27; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3p1/2p3pp/2Pp4/1K1P1P1P/8 b - - acd 70; bm Kb7; ce -32713; dm -27; pm Kb7; c9 "HHdbVI.1156923.039b.57979"; 
1Rn4k/n1p5/pb1p1N1P/3P3p/8/p1p1P2p/P1P1PP1P/6K1 b - - acd 70; bm Bc5; ce -32715; dm -26; pm Bc5; 
8/Pk2p1p1/1Pp1P3/1pP3p1/2p4p/K1Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32715; dm -26; pm Ka8; 
8/Pk2p3/1Pp1P1p1/1pP3pp/2p5/K1Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32715; dm -26; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3pp/K1Pp4/3P1P1P/8 b - - acd 70; bm Ka8; ce -32715; dm -26; pm Ka8; c9 "HHdbVI.1156925.040b.57979"; 
k7/P3p1p1/1Pp1P3/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32717; dm -25; pm Kb7; 
k7/P3p3/1Pp1P1p1/1pP3pp/1Kp5/2Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32717; dm -25; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3p1/1Kp3pp/2Pp4/3P1P1P/8 b - - acd 70; bm Kb7; ce -32717; dm -25; pm Kb7; c9 "HHdbVI.1156927.041b.57979"; 
8/Pk2p1p1/1Pp1P3/KpP3p1/2p4p/2Pp1P1P/3P4/8 b - - acd 80; bm g6; ce -32719; dm -24; pm g6; 
8/Pk2p3/1Pp1P1p1/KpP3pp/2p5/2Pp1P1P/3P4/8 b - - acd 80; bm h4; ce -32719; dm -24; pm h4; 
8/Pk2p3/1Pp1P3/KpP3p1/2p3pp/2Pp4/3P1P1P/8 b - - acd 70; bm h3; ce -32719; dm -24; pm h3; c9 "HHdbVI.1156929.042b.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32721; dm -23; pm Ka8; 
8/Pk2p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 b - - acd 80; bm Ka8; ce -32721; dm -23; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP3p1/1Kp3p1/2Pp3p/3P1P1P/8 b - - acd 70; bm Ka8; ce -32721; dm -23; pm Ka8; c9 "HHdbVI.1156931.043b.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/3P4/1K6 b - - acd 80; bm Kb7; ce -32723; dm -22; pm Kb7; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/K1Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32723; dm -22; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3p1/2p3p1/K1Pp3p/3P1P1P/8 b - - acd 70; bm Kb7; ce -32723; dm -22; pm Kb7; c9 "HHdbVI.1156933.044b.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/K2P4/8 b - - acd 80; bm Ka8; ce -32725; dm -21; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3p1/2Pp3p/K2P1P1P/8 b - - acd 70; bm Ka8; ce -32725; dm -21; pm Ka8; c9 "HHdbVI.1156935.045b.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/2p4p/2Pp1P1P/1K1P4/8 b - - acd 80; bm Kb7; ce -32727; dm -20; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3p1/2p3p1/2Pp3p/1K1P1P1P/8 b - - acd 70; bm Kb7; ce -32727; dm -20; pm Kb7; c9 "HHdbVI.1156937.046b.57979"; 
8/Pk2p3/1Pp1P1p1/1pP3p1/2p4p/K1Pp1P1P/3P4/8 b - - acd 80; bm Ka8; ce -32729; dm -19; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3p1/K1Pp3p/3P1P1P/8 b - - acd 70; bm Ka8; ce -32729; dm -19; pm Ka8; c9 "HHdbVI.1156939.047b.57979"; 
k7/P3p3/1Pp1P1p1/1pP3p1/1Kp4p/2Pp1P1P/3P4/8 b - - acd 80; bm Kb7; ce -32731; dm -18; pm Kb7; 
k7/P3p3/1Pp1P3/1pP3p1/1Kp3p1/2Pp3p/3P1P1P/8 b - - acd 70; bm Kb7; ce -32731; dm -18; pm Kb7; c9 "HHdbVI.1156941.048b.57979"; 
8/Pk2p3/1Pp1P1p1/KpP3p1/2p4p/2Pp1P1P/3P4/8 b - - acd 80; bm g4; ce -32733; dm -17; pm g4; 
8/Pk2p3/1Pp1P3/KpP3p1/2p3p1/2Pp3p/3P1P1P/8 b - - acd 84; bm g3; ce -32733; dm -17; pm g3; c9 "HHdbVI.1156943.049b.57979"; 
8/Pk2p3/1Pp1P1p1/KpP5/2p3Pp/2Pp3P/3P4/8 b - - acd 80; bm g5; ce -32735; dm -16; pm g5; 
8/Pk2p3/1Pp1P3/KpP3p1/2p5/2Pp2Pp/3P3P/8 b - - acd 73; bm g4; ce -32735; dm -16; pm g4; c9 "HHdbVI.1156945.050b.57979"; 
8/Pk2p3/1Pp1P3/1pP3p1/1Kp3Pp/2Pp3P/3P4/8 b - - acd 80; bm Ka8; ce -32737; dm -15; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP5/1Kp3p1/2Pp2Pp/3P3P/8 b - - acd 70; bm Ka8; ce -32737; dm -15; pm Ka8; c9 "HHdbVI.1156947.051b.57979"; 
k7/P3p3/1Pp1P3/1pP3p1/2p3Pp/K1Pp3P/3P4/8 b - - acd 80; bm Kb7; ce -32739; dm -14; pm Kb7; 
k7/P3p3/1Pp1P3/1pP5/2p3p1/K1Pp2Pp/3P3P/8 b - - acd 70; bm Kb7; ce -32739; dm -14; pm Kb7; c9 "HHdbVI.1156949.052b.57979"; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3Pp/2Pp3P/1K1P4/8 b - - acd 80; bm Ka8; ce -32741; dm -13; pm Ka8; 
8/Pk2p3/1Pp1P3/1pP5/2p3p1/2Pp2Pp/K2P3P/8 b - - acd 70; bm b4; ce -32741; dm -13; pm b4; c9 "HHdbVI.1156951.053b.57979"; 
k7/P3p3/1Pp1P1p1/2P3p1/1Pp4p/3p1P1P/3P4/1K6 b - - acd 80; bm g4; ce -32743; dm -12; pm g4; 
k7/P3p3/1Pp1P3/1pP3p1/2p3Pp/2Pp3P/3P4/1K6 b - - acd 80; bm Kb7; ce -32743; dm -12; pm Kb7; 
8/Pk2p3/1Pp1P3/1pP3p1/2p3Pp/2Pp3P/3P4/2K5 b - - acd 80; bm Ka8; ce -32745; dm -11; pm Ka8; 
k7/P3p3/1Pp1P3/1pP5/2p3p1/2Pp2Pp/1K1P3P/8 b - - acd 199; bm Kb7; ce -32747; dm -10; pm Kb7; c9 "HHdbVI.1156953.054b.57979"; 
8/Pk2p3/1Pp1P3/1pP5/2p3p1/K1Pp2Pp/3P3P/8 b - - acd 211; bm Ka8; ce -32749; dm -9; pm Ka8; c9 "HHdbVI.1156955.055b.57979"; 
8/Pk2p3/1Pp1P3/2P3p1/1Pp3Pp/3p3P/3P4/2K5 b - - acd 80; bm Ka8; ce -32749; dm -9; pm Ka8; 
8/Pk2p3/1Pp1P3/2P3p1/1P4Pp/2Pp3P/8/2K5 b - - acd 80; bm d2+; ce -32751; dm -8; pm d2+; 
k7/P3p3/1Pp1P3/1pP5/1Kp3p1/2Pp2Pp/3P3P/8 b - - acd 204; bm Kb7; ce -32751; dm -8; pm Kb7; c9 "HHdbVI.1156957.056b.57979"; 
8/Pk2p3/1Pp1P3/KpP5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 70; bm b4; ce -32753; dm -7; pm b4; c9 "HHdbVI.1156959.057b.57979"; 
k7/P3p3/1Pp1P3/1PP3p1/6Pp/2Pp3P/8/2K5 b - - acd 80; bm Kb7; ce -32753; dm -7; pm Kb7; 
8/Pk2p3/1Pp1P3/2P5/1Kp3p1/2Pp2Pp/3P3P/8 b - - acd 245; bm Ka8; ce -32755; dm -6; pm Ka8; c9 "HHdbVI.1156961.058b.57979"; 
k7/P3p3/1Pp1P3/1PP3p1/6Pp/2P4P/3K4/8 b - - acd 80; bm Kb7; ce -32755; dm -6; pm Kb7; 
k7/P3p3/1PP1P3/1p4p1/6Pp/2P4P/3K4/8 b - - acd 80; bm b4; ce -32757; dm -5; pm b4; 
k7/P3p3/1Pp1P3/K1P5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 70; bm Kb7; ce -32757; dm -5; pm Kb7; c9 "HHdbVI.1156963.059b.57979"; 
k7/P3p3/1PP1P3/6p1/1pP3Pp/7P/3K4/8 b - - acd 80; bm b3; ce -32759; dm -4; pm b3; 
Q7/1k2p3/1Pp1P3/K1P5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 999; bm Kxa8; ce -32759; dm -4; pm Kxa8; c9 "HHdbVI.1156965.060b.57979"; 
k7/4p3/KPp1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 999; bm Kb8; ce -32761; dm -3; pm Kb8; c9 "HHdbVI.1156967.061b.57979"; 
k7/P1P1p3/1P2P3/6p1/2P3Pp/1p5P/3K4/8 b - - acd 80; bm Kb7; ce -32761; dm -3; pm Kb7; 
1k6/1P2p3/K1p1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 999; bm Kc7; ce -32763; dm -2; pm Kc7; c9 "HHdbVI.1156969.062b.57979"; 
Q7/1kP1p3/1P2P3/6p1/2P3Pp/1p5P/3K4/8 b - - acd 80; bm Kxb6; ce -32763; dm -2; pm Kxb6; 
8/KPk1p3/2p1P3/2P5/2p3p1/2Pp2Pp/3P3P/8 b - - acd 999; bm Kd8; ce -32765; dm -1; pm Kd8; c9 "HHdbVI.1156971.063b.57979"; 
Q1Q5/4p3/1k2P3/6p1/2P3Pp/1p5P/3K4/8 b - - acd 80; bm b2; ce -32765; dm -1; pm b2; 
However, I was only able to find a mate solution for this one:
[d]R1n4k/n1p5/pb1p1N1P/3P3p/7p/p1p1P3/P1P1PP1P/7K w - - acd 70; bm Rb8; ce 32712; c7 "No. 309494 (id: P1402334) Rotenberg, Jacques; Loustau, Jean-Marc source 1: Phenix, 1993-1994 stipulation: #34 solution: 1.Tb8! h3 2.Kg1 Lc5 3.Kf1 Lb6 4.Ke1 Lc5 5.Kd1 Lb6 6.Kc1 Lc5 7.Kb1 Lb6 8.Ka1 h4 9.Kb1 Lc5 10.Kc1 Lb6 11.Kd1 Lc5 12.Ke1 Lb6 13.Kf1 Lc5 14.Kg1 Lb6 15.Kh1 a5 16.Kg1 Lc5 17.Kf1 Lb6 18.Ke1 Lc5 19.Kd1 Lb6 20.Kc1 Lc5 21.Kb1 Lb6 22.Ka1 a4 23.Kb1 Lc5 24.Kc1 Lb6 25.Kd1 Lc5 26.Ke1 Lb6 27.Kf1 Lc5 28.Kg1 Lb6 29.Kh1 Lc5! 30.Tb1 Ld4 31.exd4 Se7 32.Tg1 Sg6 33.Txg6 ...34.Tg8#"; dm 28; pm Rb8; pv Rb8 h3 Kg1 Bc5 Rb1 Nb6 Kh1 Nd7 Nxd7 Kh7 Nxc5 Nc8 Nxa6 Nb6 Nxc7 Nd7 f3 Ne5 Ne6 Kxh6 Rb3 Kg6 Rxc3 Nd7 Rxa3 Kf6 e4 Nb6 Rb3 Nc4 a4 h4 Rc3 Nd2 a5 Nf1 a6 Ng3+ hxg3 hxg3 a7 Kg6 a8=Q g2+ Kg1 h2+ Kxg2 h1=Q+ Kxh1 Kf7 Qf8+ Kg6 Qg7+ Kh5 Qg5+; id "ChestDB.06430";

Which appears to be a mate in 28 or less (though the key move in the original problem is correct).

For this one, despite all the helpful precursor positions to analyze, I have not yet driven to mate:
[d]8/Pk2p1pp/1Pp1P3/1pP3p1/2p5/2Pp4/3P1P1P/7K w - - acd 70; bm Kg2; ce 9615; pm Kg2; pv Kg2 Ka8 Kf1 Kb7 f3 Ka8 Kf2 Kb7 Ke1 Ka8 Kd1 Kb7 Kc1 Ka8 Kb2 Kb7 Ka3 Ka8 Kb4 Kb7 Ka5 h6 Kb4 Ka8 Ka3 Kb7 Kb2 Ka8 Kc1 Kb7 Kb1 Ka8 Kb2 Kb7 Ka3 Ka8 Kb4 Kb7 Ka5 h5 h3 h4 Kb4 Ka8 Ka3 Kb7 Kb2 Ka8 Kc1 Kb7 Kb1 Ka8 Kb2 Kb7 Ka3 Ka8 Kb4 Kb7 Ka5 g6 Kb4 Ka8 Ka3 Kb7 Kb2 Ka8 Kb1 b4 cxb4 c3; id "ChestDB.06542";

However, I think in a couple days the solution will fall out. It is currently hung analyzing on ply 72 (two plies from the start of the problem), failing high over and over. It seems that the first two or three moves are by far the most difficult. Analysis powers through all the other child positions very quickly.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
acase
Posts: 990
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: 8 hard positions from the Chest database

Post by acase »

peter wrote: Sat Mar 30, 2024 8:29 pm
peter wrote: Sat Mar 30, 2024 3:08 pm
peter wrote: Sat Mar 30, 2024 12:39 pm
Dann Corbit wrote: Fri Mar 29, 2024 7:39 pm These are the only 8 positions for which I have not found a checkmate solution:
[d]2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - acd 44; bm Kf4; ce 630; c2 "#23;"; pm Kf4; pv Kf4; id "ChestDB.06301";
Maybe not only DTM but bm could be wrong too?
Sting favors 1.Qe6, Huntsman get's this output with some Forward- Backward from and to these first 5 moves

2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1
1. Qe6 Bf7 2. Qxc8 cxd2 3. Bc2 Nc3+ 4. Ke3 d1=Q 5. Bxd1 Kxd1

[d]2Q5/5bp1/2P5/5P2/1p6/pPn1K3/8/3k4 w - - 0 1

Analysis by The Huntsman 1:

6.c7 Kc2 7.Qb7 a2 8.Qa6 Kb2 9.c8Q a1Q 10.Qxa1+ Kxa1 11.Qf8 Bh5 12.Kd3 Kb2 13.Qxb4 Na2 14.Qb7 Nc1+ 15.Kd2 Nxb3+ 16.Kd3 Be2+ 17.Kxe2 Kc3 18.Qxg7+ Kc4 19.Ke3 Nc5 20.Qd4+ Kb5 21.Qd5 Kb6 22.f6 Na6 23.f7 Nc7 24.Qd6+ Kb5 25.Qxc7 Ka4 26.f8Q Kb3 27.Qfb8+ Ka3 28.Qca7#
Depth: 63/46 00:00:00 13858kN
After 1.Qe6 Bf7:

[d]2r5/5bp1/2P1Q3/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1

Analysis by The Huntsman 1:

2.Qxc8 cxd2 3.Bc2 Nc3+ 4.Ke3 a2 5.Qa6 Be8 6.c7 Bd7 7.Qa8 d1N+ 8.Bxd1 Nxd1+ 9.Kd4 Nc3 10.Kc5 Kd2 11.Kxb4 Bxf5 12.Qg2+ Ne2 13.Qxg7 Bc8 14.Qb2+ Ke3 15.Qxa2 Bg4 16.Qa6 Ng3 17.Kc5 Ne2 18.c8Q Bxc8 19.Qxc8 Kf4 20.Kc4 Kf3 21.Qf5+ Ke3 22.Qg5+ Kf3 23.b4 Ng3 24.b5 Ne4 25.Qd5 Ke3 26.Qd4+ Kf3 27.b6 Ng3 28.Qd3+ Kg4 29.b7 Kh4 30.b8Q Nh5 31.Qe4+ Kh3 32.Qf3+ Kh4 33.Qh2+ Kg5 34.Qhxh5#
Depth: 60/66 00:01:00 2992MN

Output with even shorter DTM I get after 1...Bxc6, 1...Rxc6, 1...Kd1, 1...Bh5 but to keep all these and other alternatives at 1st move of Black's in 32G hash in reasonable hardware- time together with 1st move of White's I gave up trying. One more full move backward to original starting position I'm leaving for good, regards
Excellent analysis as usual Peter, I did a forward-backwards myself with several different engines on this position and came up with something similar to yours:

[pgn][Event "1.Kf4"]
[Site "?"]
[Date "2024.03.22"]
[Round "40"]
[White "Chest, .epd"]
[Black "6301, #23?"]
[Result "1-0"]
[BlackElo "2000"]
[WhiteElo "2000"]
[TimeControl "0"]
[SetUp "1"]
[FEN "2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1"]
[Termination "normal"]
[PlyCount "67"]
[WhiteType "program"]
[BlackType "program"]

1. Qe6 {+M34/66 23} Bf7 2. Qxc8 cxd2 3. Bc2 Nc3+ 4. Ke3 a2 5. Qa6 Be8 6. c7
Bd7 7. Qd6 d1=N+ 8. Bxd1 Nxd1+ 9. Kf3 a1=Q 10. Qe7+ Kd2 11. Qxd7+ Kc2 12.
c8=Q+ Nc3 13. Qc4 Qh1+ 14. Kg4 Qg1+ 15. Kh5 Qh2+ 16. Kg6 Qh6+ 17. Kf7 Qh5+
18. Kg8 Qf3 19. Qxb4 Qa8+ 20. Kf7 Qf3 21. Qbd4 Qh5+ 22. Kg8 Qf3 23. Qd2+
Kb1 24. Qe1+ Kb2 25. Qdd2+ Kxb3 26. Qe6+ Qd5 27. Qdxd5+ Nxd5 28. Qxd5+ Kc2
29. Kxg7 Kc3 30. f6 Kc2 31. f7 Kc1 32. f8=Q Kb2 33. Qd2+ Kb3 34. Qfb4# 1-0
[/pgn]

The thing that makes this one so tough is that there are SEVERAL different moves (duals) that lead to the same outcome, about a mate in 34 for the 1.Qe6 variation, and I'm sure there are several different duals for the 1.Kf4 variation.
peter
Posts: 3188
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: 8 hard positions from the Chest database

Post by peter »

acase wrote: Sat Mar 30, 2024 11:25 pm I did a forward-backwards myself with several different engines on this position and came up with something similar to yours:

[pgn][Event "1.Kf4"]
[Site "?"]
[Date "2024.03.22"]
[Round "40"]
[White "Chest, .epd"]
[Black "6301, #23?"]
[Result "1-0"]
[BlackElo "2000"]
[WhiteElo "2000"]
[TimeControl "0"]
[SetUp "1"]
[FEN "2r1b1Q1/6p1/2P5/5P2/1p2K3/pPp5/n2P4/1B2k3 w - - 0 1"]
[Termination "normal"]
[PlyCount "67"]
[WhiteType "program"]
[BlackType "program"]

1. Qe6 {+M34/66 23} Bf7 2. Qxc8 cxd2 3. Bc2 Nc3+ 4. Ke3 a2 5. Qa6 Be8 6. c7
Bd7 7. Qd6 d1=N+ 8. Bxd1 Nxd1+ 9. Kf3 a1=Q 10. Qe7+ Kd2 11. Qxd7+ Kc2 12.
c8=Q+ Nc3 13. Qc4 Qh1+ 14. Kg4 Qg1+ 15. Kh5 Qh2+ 16. Kg6 Qh6+ 17. Kf7 Qh5+
18. Kg8 Qf3 19. Qxb4 Qa8+ 20. Kf7 Qf3 21. Qbd4 Qh5+ 22. Kg8 Qf3 23. Qd2+
Kb1 24. Qe1+ Kb2 25. Qdd2+ Kxb3 26. Qe6+ Qd5 27. Qdxd5+ Nxd5 28. Qxd5+ Kc2
29. Kxg7 Kc3 30. f6 Kc2 31. f7 Kc1 32. f8=Q Kb2 33. Qd2+ Kb3 34. Qfb4# 1-0
[/pgn]

The thing that makes this one so tough is that there are SEVERAL different moves (duals) that lead to the same outcome, about a mate in 34 for the 1.Qe6 variation, and I'm sure there are several different duals for the 1.Kf4 variation.
Yet I don't see 1.Kf4 giving nearly as short DTM as 1.Qe6 does, as far as I saw about ten moves more for the originally (in Chest.epd) given solution, anyhow #23 seems unrealistic at all. Would be interesting to know any source, if it was a study (don't think so) author could have a thematic reason to prefer Kf4 without caring for exact DTM and maybe I completely missed such a point and for 20 moves (Kf4) differing tactical hot shots that even Huntsman doesn't get on its own neither, that seems rather unlikely to me.
As long as I don't have any other sources or much shorter variants than ours, I'd say as well best move as DTM in Chest.epd is simply wrong, regards
Peter.
acase
Posts: 990
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: 8 hard positions from the Chest database

Post by acase »

For the "mate in 125" by Otto Blathy, here is the INTENDED solution for that one courtesy of Jon (Nordlandia):

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "Q1b4q/2Pp2p1/3P1k1b/6pP/3p1pPp/3P1pBK/5P2/8 w - - 0 1"]
[Setup "1"]
[Plycount "249"]
[TimeControl "300+5"]

1. Qe4 Kf7 2. Qe7+ Kg8 3. Qe8+ Kh7 4. Qg6+ Kg8 5. Bh2 Kf8 6. Qf5+ Kg8 7. Qd5+
Kf8 8. Qe5 Kf7 9. Qe7+ Kg8 10. Qe8+ Kh7 11. Qg6+ Kg8 12. Bg1 Kf8 13. Qf5+ Kg8
14. Qd5+ Kf8 15. Qe5 Kf7 16. Qe7+ Kg8 17. Qe8+ Kh7 18. Qg6+ Kg8 19. Kh2 Kf8 20.
Qf5+ Kg8 21. Qd5+ Kf8 22. Qe5 Kf7 23. Qe7+ Kg8 24. Qe8+ Kh7 25. Qg6+ Kg8 26. Kh1
Kf8 27. Qf5+ Kg8 28. Qd5+ Kf8 29. Qe5 Kf7 30. Qe7+ Kg8 31. Qe8+ Kh7 32. Qg6+ Kg8
33. Bh2 Kf8 34. Qf5+ Kg8 35. Qd5+ Kf8 36. Qe5 Kf7 37. Qe7+ Kg8 38. Qe8+ Kh7 39.
Qg6+ Kg8 40. Kg1 Kf8 41. Qf5+ Kg8 42. Qd5+ Kf8 43. Qe5 Kf7 44. Qe7+ Kg8 45. Qe8+
Kh7 46. Qg6+ Kg8 47. Kf1 Kf8 48. Qf5+ Kg8 49. Qd5+ Kf8 50. Qe5 Kf7 51. Qe7+ Kg8
52. Qe8+ Kh7 53. Qg6+ Kg8 54. Ke1 Kf8 55. Qf5+ Kg8 56. Qd5+ Kf8 57. Qe5 Kf7 58.
Qe7+ Kg8 59. Qe8+ Kh7 60. Qg6+ Kg8 61. Kd2 Kf8 62. Qf5+ Kg8 63. Qd5+ Kf8 64. Qe5
Kf7 65. Qe7+ Kg8 66. Qe8+ Kh7 67. Qg6+ Kg8 68. Kc2 Kf8 69. Qf5+ Kg8 70. Qd5+ Kf8
71. Qe5 Kf7 72. Qe7+ Kg8 73. Qe8+ Kh7 74. Qg6+ Kg8 75. Kb2 (75. Kb3 {0} 75...
Kf8 76. Qf5+ Kg8 77. Qd5+ Kf8 78. Qe5 Qg8+ $1 {[%c_effect
g8;square;g8;type;GreatFind;persistent;true]}) 75... Kf8 76. Qf5+ Kg8 77. Qd5+
Kf8 78. Qe5 Kf7 79. Qe7+ Kg8 80. Qe8+ Kh7 81. Qg6+ Kg8 82. Ka3 Kf8 83. Qf5+ Kg8
84. Qd5+ Kf8 85. Qe5 Kf7 86. Qe7+ Kg8 87. Qe8+ Kh7 88. Qg6+ Kg8 89. Ka4 Kf8 90.
Qf5+ Kg8 91. Qd5+ Kf8 92. Qe5 Kf7 93. Qe7+ Kg8 94. Qe8+ Kh7 95. Qg6+ Kg8 96. Ka5
Kf8 97. Qf5+ Kg8 98. Qd5+ Kf8 99. Qe5 Kf7 100. Qe7+ Kg8 101. Qe8+ Kh7 102. Qg6+
Kg8 103. Kb6 Kf8 104. Qf5+ Kg8 105. Qd5+ Kf8 106. Qe5 Kf7 107. Qe7+ Kg8 108.
Qe8+ Kh7 109. Qg6+ Kg8 110. Ka7 Kf8 111. Qf5+ Kg8 112. Qd5+ Kf8 113. Qe5 Kf7
114. Qe7+ Kg8 115. Qe8+ Kh7 116. Qg6+ Kg8 117. Kb8 Kf8 118. Kxc8 Qg8 119. Kxd7
Qf7+ 120. Qxf7+ Kxf7 121. c8=Q g6 122. Qe8+ Kg7 123. hxg6 h3 124. Qf7+ Kh8 125.
Qh7# 1-0[/pgn]

BUT, This one is COOKED BIG TIME and ends up being a mate in 55-59 as our very good friend Vincent pointed out YEARS ago that at some point White plays Bxf4 or Bxh4 and then more than cuts the mate in half, In my pgn I am showing a mate in 55, but as usual there may be better moves than I am showing, but I firmly believe that this mate CAN be shortened to NO MORE than 59 moves:

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[BlackElo "0"]
[WhiteElo "0"]
[TimeControl "0"]
[SetUp "1"]
[FEN "Q1b4q/2Pp2p1/3P1k1b/6pP/3p1pPp/3P1pBK/5P2/8 w - - 0 1"]
[Termination "normal"]
[PlyCount "109"]
[WhiteType "program"]
[BlackType "program"]

1. Qe4 Kf7 2. Qe7+ Kg8 3. Qe8+ Kh7 4. Qg6+ Kg8 5. Bxh4 gxh4 6. Kxh4 Kf8 7.
g5 {+M49/69 444 ShashChess34.6-x86-64-bmi2} Bxg5+ 8. Qxg5 Kg8 9. Kg4 Qh6
10. Qd8+ Kh7 11. Qxc8 Qe6+ 12. Kxf3 Qh3+ 13. Ke4 Qh1+ 14. Ke5 Qe1+ 15. Kf5
Qe6+ 16. Kxf4 Qxd6+ 17. Ke4 Qe7+ (17. .. Qc6+ 18. Kxd4 {+M33/123 19491
Stockfish_24021118_x64_bmi2} Qa4+ 19. Ke3 Qc6 20. Kd2 Qh6+ 21. Kc3 Qf6+ 22.
Kb4 Qb6+ 23. Ka4 Qd4+ 24. Ka5 Qxd3 25. Kb6 Qf3 26. Ka6 Qf6+ 27. Kb7 Qb2+
28. Ka8 Qa2+ 29. Kb8 Qxf2 30. Qa6 Qh2 31. Qd3+ Kh8 32. Qd5 Qf4 33. Kc8 Qh4
34. h6 gxh6 35. Kxd7 Qg4+ 36. Kd6 h5 37. Qe5+ Kh7 38. Qe7+ Kh8 39. Qf8+ Kh7
40. c8=Q Qd4+ 41. Ke7 Qb4+ 42. Ke8 Qxf8+ 43. Kxf8 Kg6 44. Qc5 Kf6 45. Qxh5
Ke6 46. Qc5 Kf6 47. Qd5 Kg6 48. Qe5 Kh6 49. Kf7 Kh7 50. Qh2#) 18. Kd5 Qe6+
19. Kxd4 Qf5 20. f4 Qxf4+ (20. .. Qf6+ 21. Kc5 {+M31/80 560
Stockfish_24021118_x64_bmi2} Qc6+ 22. Kb4 Qb6+ 23. Ka4 Qd4+ 24. Ka5 Qxd3
25. Kb6 Qf3 26. Ka7 Qxf4 27. Qb7 Qd4+ 28. Qb6 Qa1+ 29. Kb7 Qh1+ 30. Kb8 Qh2
31. Qd4 Kg8 32. Qd5+ Kh7 33. Kb7 Qb2+ 34. Kc8 Qb4 35. Kd8 Qb6 36. Kxd7 Qa7
37. Qe4+ Kg8 38. Qb4 Kf7 39. Qc4+ Kf8 40. Qg4 Qb7 41. Qf5+ Kg8 42. Qe6+ Kh7
43. Kd8 Qg2 44. c8=Q Qg5+ 45. Ke8 Qb5+ 46. Kf7 Qxh5+ 47. Kf8 Qf3+ 48. Qf5+
Qxf5+ 49. Qxf5+ Kh6 50. Kf7 g6 51. Qxg6#) (20. .. g6 21. Qd8 {+M25/80 438
Stockfish_24021118_x64_bmi2} Qxf4+ 22. Kc5 Qe3+ 23. d4 Qc3+ 24. Kb5 Qd3+
25. Ka5 Qa3+ 26. Kb6 Qb4+ 27. Ka6 Qa3+ 28. Kb7 Qb4+ 29. Kc8 gxh5 30. Qf6 d6
31. Kd7 Qb5+ 32. Ke7 Qc6 33. Qxd6 Qc4 34. Qd7 Kg6 35. Qe6+ Qxe6+ 36. Kxe6
Kg5 37. c8=Q Kg4 38. d5 h4 39. d6 h3 40. d7 h2 41. Qg8+ Kf4 42. d8=Q h1=Q
43. Qgg5+ Kf3 44. Qd3+ Kf2 45. Qgg3#) 21. Kc5 Qe3+ 22. d4 Qc3+ 23. Kb6
Qxd4+ 24. Kb7 Qb4+ 25. Ka8 Qa5+ 26. Kb8 Qxh5 27. Qb7 Qe5 28. Qb4 Kh8 29.
Kb7 Qd5+ 30. Ka7 Qa2+ 31. Kb8 Qh2 32. Qf8+ Kh7 33. Qf5+ Kh8 34. Qg5 Kg8 35.
Qd5+ Kf8 36. Qc4 Ke8 37. Qg8+ Ke7 38. Qxg7+ Ke6 39. Kb7 Qh1+ 40. Ka7 Qc1
41. Qg8+ Kf5 42. c8=Q Qe3+ 43. Kb8 Qe5+ 44. Qc7 Qb5+ 45. Kc8 Qc6 46. Qh7+
Kg4 47. Qxd7+ Qxd7+ 48. Kxd7 Kf3 49. Qc3+ Kf2 50. Ke6 Kf1 51. Ke5 Kf2 52.
Kf4 Ke2 53. Qc2+ Kf1 54. Kf3 Kg1 55. Qg2# 1-0
[/pgn]

As usual if anyone sees any improvements for either side in my pgn than please post them.