Faster Forced Mate

[peter]

Crosswrote
http://www.talkchess.com/forum/viewtopi ... 66&t=64417

I don't think that fine piece to be cooked, Mike, if you yet still think so, give a winning line else than author's solution, no matter how long to mate, that's not a mate in x- study.
Question is simply, if there is a white win after not playing 1.Nf7 at all.
I dont' see any

[peter]

As far as I can see, there are only two not losing moves for White here, both leading to more or less forced draw:

[pgn]
[Event "#55 Classic Triangle"]
[Site "?"]
[Date "2017.07.25"]
[Round "?"]
[White "Krzek, Janusz"]
[Black "Phénix, 1993"]
[Result "1-0"]
[Annotator "Martan,Peter"]
[SetUp "1"]
[FEN "rrk1N2N/pRn3p1/PbBp1pp1/3P4/K1pP3n/2p5/2P3p1/6Bb w - - 0 1"]
[PlyCount "50"]

1. Nxd6+ $2 (1. Nf7 $1 {#55}) 1... Kd8 2. Ndf7+ Ke7 3. d6+ Kf8 4. dxc7 Bxc7 5.
Rxc7 Rb1 6. Bxa8 Rxg1 7. Bc6 Ra1+ 8. Kb5 Rb1+ 9. Kc5 Kg8 10. Ng5 Rb8 11. Nh3 g5
12. Rxa7 g4 13. Ng1 Rb1 14. Be4 f5 15. Nf7 Kh7 (15... fxe4 $2 16. Ng5 g6 17.
Ra8+ Kg7 18. Ne6+ Kf6 19. a7 Ra1 20. Kd6 Rxa7 21. Rxa7 Nf5+ 22. Kd7 e3 23. Ra8
g5 24. d5 e2 25. Nxe2 g1=B 26. Nxg1 Bxd5 27. Ra6 Ne3 28. Ne2 Ke5 29. Ra5 Kf6
30. N6d4 Ke5 31. Nb5 Be6+ 32. Kc6 Bd5+ 33. Kc7 Bf3 34. Nbxc3+ Kf6 35. Nd4 Kg6
36. Kd6 Kh5 37. Ke7 Kg6 38. Re5 Nf1 39. Re6+ Kh5 40. Kf6 Nd2 41. Re5 Kh4 42.
Rxg5 Kg3 43. Kf5 Nf1 44. Ne4+ Kg2 45. Kf4 Bxe4 46. Kxe4 g3 47. Nf5 Kf2 48. Nxg3
Nxg3+ 49. Rxg3 Kxg3 50. Kd4 c3 51. Kxc3 Kg4 52. Kd4 Kf5 53. Kd5 Kf6 54. Kd6 Kg7
55. c4 Kf8 56. Kd7 Kg7 57. c5 Kf6 58. c6 Ke5 59. c7 Kd4 60. c8=Q Ke3 61. Kc6
Kf4 62. Kd5 Kf3 63. Qf5+ Kg2 64. Qg4+ Kf2 65. Ke4 Ke1 66. Qg2 Kd1 67. Kd3 Kc1
68. Qc2#) 16. Ng5+ (16. Bxg2 Bxg2 17. Ne2 Rb2 18. d5 Rxc2 19. Re7 Ng6 20. Re6
Bxd5 21. Ng5+ Kh6 22. Nf7+ Kh7 23. Ng5+ Kh6 24. Nf7+ Kh7 {3f}) (16. Ne2 $2 fxe4
$19) 16... Kg6 17. Rxg7+ Kxg7 18. a7 Ra1 19. a8=Q Rxa8 20. Bxa8 Kf6 $11 21. d5
Ng6 22. Nh7+ Kg7 23. Ng5 Kf6 24. Nh7+ Kg7 25. Ng5 Kf6 {3f} 1-0
[/pgn]

Not giving in to 3 fold there would arise tbs- draw sooner or later I guess, e.g. after 22.Ne6 instead of Nh7+ above:

[d]B7/8/4Nkn1/2KP1p2/2p3p1/2p5/2P3p1/6Nb b - - 0 1

Analysis by Stockfish 140717 64 POPCNT:

22...f4 23.Nd4 f3 24.Ndxf3 gxf3 25.Nxf3 Ne5 26.Ng1 Nd7+ 27.Kd4 Ne5 28.Bc6 Nf7 29.Kxc4 Kf5 30.Kxc3 Ke4 31.d6+ Ke3 32.d7 Kf2 33.Nh3+ Kg3 34.Bd5 Kxh3 35.Bxf7 g1Q 36.d8Q Qg7+ 37.Kd3 Qxf7
= (0.00) Depth: 53/32 00:03:42 4107MN, tb=40686184

[MikeGL]

Thanks for that pgn subvariation for Mate in 55, saved it on my backups.

Here's a puzzles from yacpdb position 67722 published as Mate in #42,
but there seems to be a faster mate in 24.

[d]8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4
Published as Mate in 42 at yacpdb position 67722, but there's a cook? at 24

[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.25"]
[Round "?"]
[White "?"]
[Black "McBrain_2017"]
[Result "*"]
[BlackElo "2400"]
[WhiteElo "2400"]
[TimeControl "7200+30"]
[SetUp "1"]
[FEN "8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4 w - - 0 1"]
[Termination "normal"]
[PlyCount "47"]
[WhiteType "human"]
[BlackType "human"]

1. Kg3 Ka3 2. Ra4+ Kb2 3. Kf2 Kc3 4. Rc4+ Kb2 5. Ke3 Ka3 6. Ra4+ Kb2 7. Kd4
a5 8. Ke3 Kc3 9. Rc4+ Kb2 10. d4 g5 11. Kd3 Ka3 12. Ra4+ Kb2 13. Rxa5 gxf4
14. d5 exd5 15. Ra4 d4 16. Kc4 d3 17. Kd5 Kc3 18. Rc4+ Kb2 19. e6 Ka3 20.
Ra4+ Kb2 21. e7 Kc3 22. e8=Q Rb5+ 23. Qxb5 Qb1 (23. .. Ba3 24. Rxa3#) (23... Bb2 24. Rc4#) 24. Rc4#
[/pgn]

[Ignacio]

Thanks for that pgn subvariation for Mate in 55, saved it on my backups.

Here's a puzzles from yacpdb position 67722 published as Mate in #42,
but there seems to be a faster mate in 24.

[d]8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4
Published as Mate in 42 at yacpdb position 67722, but there's a cook? at 24

[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.25"]
[Round "?"]
[White "?"]
[Black "McBrain_2017"]
[Result "*"]
[BlackElo "2400"]
[WhiteElo "2400"]
[TimeControl "7200+30"]
[SetUp "1"]
[FEN "8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4 w - - 0 1"]
[Termination "normal"]
[PlyCount "47"]
[WhiteType "human"]
[BlackType "human"]

1. Kg3 Ka3 2. Ra4+ Kb2 3. Kf2 Kc3 4. Rc4+ Kb2 5. Ke3 Ka3 6. Ra4+ Kb2 7. Kd4
a5 8. Ke3 Kc3 9. Rc4+ Kb2 10. d4 g5 11. Kd3 Ka3 12. Ra4+ Kb2 13. Rxa5 gxf4
14. d5 exd5 15. Ra4 d4 16. Kc4 d3 17. Kd5 Kc3 18. Rc4+ Kb2 19. e6 Ka3 20.
Ra4+ Kb2 21. e7 Kc3 22. e8=Q Rb5+ 23. Qxb5 Qb1 (23. .. Ba3 24. Rxa3#) (23... Bb2 24. Rc4#) 24. Rc4#
[/pgn]

It's mate in 22 with 11.fg5 (not 11.Kd3).
I have this position as Mate in 20. The best is 8.Kc4. In Chest.epd says Mate in 20.

[MikeGL]

Thanks for that pgn subvariation for Mate in 55, saved it on my backups.

Here's a puzzles from yacpdb position 67722 published as Mate in #42,
but there seems to be a faster mate in 24.

[d]8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4
Published as Mate in 42 at yacpdb position 67722, but there's a cook? at 24

[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.25"]
[Round "?"]
[White "?"]
[Black "McBrain_2017"]
[Result "*"]
[BlackElo "2400"]
[WhiteElo "2400"]
[TimeControl "7200+30"]
[SetUp "1"]
[FEN "8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4 w - - 0 1"]
[Termination "normal"]
[PlyCount "47"]
[WhiteType "human"]
[BlackType "human"]

1. Kg3 Ka3 2. Ra4+ Kb2 3. Kf2 Kc3 4. Rc4+ Kb2 5. Ke3 Ka3 6. Ra4+ Kb2 7. Kd4
a5 8. Ke3 Kc3 9. Rc4+ Kb2 10. d4 g5 11. Kd3 Ka3 12. Ra4+ Kb2 13. Rxa5 gxf4
14. d5 exd5 15. Ra4 d4 16. Kc4 d3 17. Kd5 Kc3 18. Rc4+ Kb2 19. e6 Ka3 20.
Ra4+ Kb2 21. e7 Kc3 22. e8=Q Rb5+ 23. Qxb5 Qb1 (23. .. Ba3 24. Rxa3#) (23... Bb2 24. Rc4#) 24. Rc4#
[/pgn]

It's mate in 22 with 11.fg5 (not 11.Kd3).
I have this position as Mate in 20. The best is 8.Kc4. In Chest.epd says Mate in 20.

You are correct Ignacio, actually I checked this position with
ChestUCI.epd but I scrolled down to Mate in 42 section and
didn't found it there. I should have opened the epd file in text mode
and just do a ctrl+s search of this positions string to confirm if this is
already included in Chest epd file.

It was there at ChestUCI.epd position 6025 with the relevant switches for
chest engine to solve this mate, but really irritating when it was also listed
at yacpdb as mate in #42. I have also noticed at yacpdb where some
were Mate in 80 or 90 but position is actually just a mate in 1, and it was
not a selfmate nor helpmate. It was standard chess puzzle but incorrectly
setup.

Ok enough of my rants and continue with some long puzzles.

Here's Mate in 60 source ChestUCI.epd position 6335
[d]8/p1np1p2/2B4p/2pr3P/3P3R/p1P1K1P1/P3p1kp/4Bbrq w - - 0 1
White to Play, Mate in #60

[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.25"]
[Round "?"]
[White "?"]
[Black "McBrain_2017"]
[Result "1-0"]
[TimeControl "7200+30"]
[SetUp "1"]
[FEN "8/p1np1p2/2B4p/2pr3P/3P3R/p1P1K1P1/P3p1kp/4Bbrq w - - 0 1"]
[Termination "unterminated"]
[PlyCount "119"]
[WhiteType "human"]
[BlackType "human"]

1. Bb7 c4 2. Kd2 Kf3 3. Rf4+ Kg2 4. Kc1 Kh3 5. Rh4+ Kg2 6. Kc2 Kf3 7. Rf4+
Kg2 8. Kd2 Kh3 9. Rh4+ Kg2 10. Ke3 a6 11. Kd2 Kf3 12. Rf4+ Kg2 13. Kc1 Kh3
14. Rh4+ Kg2 15. Kc2 Kf3 16. Rf4+ Kg2 17. Kd2 Kh3 18. Rh4+ Kg2 19. Ke3 a5
20. Kd2 Kf3 21. Rf4+ Kg2 22. Kc1 Kh3 23. Rh4+ Kg2 24. Kc2 Kf3 25. Rf4+ Kg2
26. Kd2 Kh3 27. Rh4+ Kg2 28. Ke3 f6 29. Kd2 Kf3 30. Rf4+ Kg2 31. Kc1 Kh3
32. Rh4+ Kg2 33. Kc2 Kf3 34. Rf4+ Kg2 35. Kd2 Kh3 36. Rh4+ Kg2 37. Ke3 f5
38. Kd2 Kf3 39. Rf4+ Kg2 40. Kc1 Kh3 41. Rh4+ Kg2 42. Kc2 Kf3 43. Rf4+ Kg2
44. Kd2 Kh3 45. Rh4+ Kg2 46. Ke3 a4 47. Kd2 Kf3 48. Rf4+ Kg2 49. Kc1 Kh3
50. Rh4+ Kg2 51. Kc2 f4 52. Rxf4 Kh3 53. Rh4+ Kg2 54. Kd2 Kf3 55. Rf4+ Kg2
56. Ke3 Kh3 57. Rh4+ Kg2 58. g4 d6 59. Bc6 Ne6 60. Bxd5#
[/pgn]
Not found at yacpdb and not included in Arpad's DB which was
posted few pages back.
Didn't find posted solution elsewhere.

regards

[Vinvin]

Distance to mate for the "Brains of Earth challenge" #6 ?

Story : http://www.stmintz.com/ccc/index.php?id=94567
EPD : http://www.stmintz.com/ccc/index.php?id=94438

What's the distance to mate here ?
SF-MF and McBrain seems to lose their memory after some time and forget the mate
[D]8/5p1p/8/6k1/8/6P1/5PP1/7K w - - bm Kh2;

[peter]

What's the distance to mate here ?
SF-MF and McBrain seems to lose their memory after some time and forget the mate
[D]8/5p1p/8/6k1/8/6P1/5PP1/7K w - - bm Kh2;

Lomonosov:

[pgn]
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/5p1p/8/6k1/8/6P1/5PP1/7K w - -"]

1.Kh2 f6 2.Kh1 f5 3.Kg1 Kf6 4.Kf1 Ke5 5.Ke1 Kd5 6.Kd1 Ke5 7.Kc2 Kd4 8.Kd2 h6 9.
Ke2 Ke4 10.Kf1 Kd4 11.Kg1 h5 12.Kh2 Ke5 13.Kh3 Kf6 14.Kh4 Kg6 15.f3 Kh6 16.g4
hxg4 17.fxg4 fxg4 18.Kxg4 Kg6 19.g3 Kf6 20.Kh5 Kg7 21.Kg5 Kh7 22.Kf6 Kh8 23.g4
Kg8 24.Kg6 Kh8 25.g5 Kg8 26.Kh6 Kf7 27.g6+ Kf8 28.Kh7 Ke7 29.g7 Kd6 30.g8Q Kc5
31.Qe8 Kd5 32.Qa4 Kc5 33.Kg7 Kd5 34.Kf7 Kc5 35.Ke6 Kb6 36.Kd6 Kb7 37.Qb4+ Ka7
38.Kc6 Ka6 39.Qa4# 1-0
[/pgn]

[MikeGL]

What's the distance to mate here ?
SF-MF and McBrain seems to lose their memory after some time and forget the mate
[D]8/5p1p/8/6k1/8/6P1/5PP1/7K w - - bm Kh2;

Same output {#M39} shown by 32-bit Critter with 5-men-tb after 8 minutes of crunching.

I think ChestUCI.epd is about to run out of zugzwang long checkmates.
Almost all were already solved, didn't touch those position with exact switches (config settings) for Chest Mate Finder. Lost interest in yacpdb with wrong label and wrong positions. Showing mate in 1 but the label is Mate in 70+

Here's position 6347 from ChestUCI.epd
[d]4n3/2p3p1/1pP1p1P1/1P1bP3/2p1p1N1/1pPkPp2/1P3P2/3NK3 w - - 0 1
White to play, (Published as Mate in 65)
Maybe I have not done optimum defense for black, reason for faster checkmate
[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.26"]
[Round "?"]
[White "McBrain_2017"]
[Black "SF8"]
[Result "1-0"]
[SetUp "1"]
[FEN "4n3/2p3p1/1pP1p1P1/1P1bP3/2p1p1N1/1pPkPp2/1P3P2/3NK3 w - - 0 1"]
[Termination "normal"]
[PlyCount "113"]
[WhiteType "human"]
[BlackType "human"]

1. Nh2 Kc2 2. Nf1 Kd3 3. Ng3 Kc2 4. Nh5 Kd3 5. Nf4+ Kc2 6. Nh3 Kd3 7. Ng5
Kc2 8. Nh7 Kd3 9. Nf8 Kc2 10. Nd7 Kd3 11. Nb8 Kc2 12. Na6 Kb1 (12. .. Kc1?
13. Nb4 Kb1 14. Kd2 Ka1 15. Kc1 Bxc6 16. bxc6 {#M12}) 13. Kd2 Ka1 14. Kc1
Ka2 15. Nb8 Ka1 16. Nd7 Ka2 17. Nf8 Ka1 18. Nh7 Ka2 19. Ng5 Ka1 20. Nh3 Ka2
21. Nf4 Ka1 22. Nh5 Ka2 23. Ng3 Ka1 24. Nf1 Ka2 25. Nd2 Ka1 26. Nb1 Ka2 27.
Na3 Ka1 28. Kd2 Ka2 29. Ke1 Ka1 30. Kf1 Ka2 31. Kg1 Ka1 32. Kh1 Ka2 33. Kh2
Ka1 34. Kg1 Ka2 35. Kf1 Ka1 36. Ke1 Ka2 37. Kd2 Ka1 38. Kc1 Ka2 39. Nb1 Ka1
40. Nd2 Ka2 41. Nf1 Ka1 42. Ng3 Ka2 43. Nh5 Ka1 44. Nf4 Ka2 45. Nh3 Ka1 46.
Ng5 Ka2 47. Nh7 Ka1 48. Nf8 Ka2 49. Nd7 Ka1 50. Nb8 Ka2 51.Na6 Ka1 52. Nb4 Bxc6 53. bxc6 b5 54. Na6 Ka2 55. Nc5 Ka1 56. Nxe6 Ka2 57. Nd4 Ka1 58. Nxb5
Ka2 59. Na3 Ka1 60. Nxc4 Ka2 61. Nd2 Nd6 62. exd6 cxd6 63. c7 d5 64. c8=R
d4 65. Ra8#
[/pgn]

Haven't found any solution for this position online.
Position not found in yacpdb nor in Arpad's DB.
Bring to the corner, return the N back, triangulate, send the N to
field again for the final zugzwang.

Only problem with this Mate puzzle is the 50-move-rule which is reached
because no pawns nor captures would be made within 50 moves.



Edit: Mate in 65 found with a simple edit on move 52.
52... Bxc6 53. bxc6 b5 54. Na6 Ka2 55. Nc5 Ka1 56. Nxe6 Ka2 57. Nd4 Ka1 58. Nxb5
Ka2 59. Na3 Ka1 60. Nxc4 Ka2 61. Nd2 Nd6 62. exd6 cxd6 63. c7 d5 64. c8=R
d4 65. Ra8#

regards

[peter]

Here's position 6347 from ChestUCI.epd
[d]4n3/2p3p1/1pP1p1P1/1P1bP3/2p1p1N1/1pPkPp2/1P3P2/3NK3 w - - 0 1
White to play, (Published as Mate in 65)
Maybe I have not done optimum defense for black, reason for faster checkmate
[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.07.26"]
[Round "?"]
[White "McBrain_2017"]
[Black "SF8"]
[Result "1-0"]
[SetUp "1"]
[FEN "4n3/2p3p1/1pP1p1P1/1P1bP3/2p1p1N1/1pPkPp2/1P3P2/3NK3 w - - 0 1"]
[Termination "normal"]
[PlyCount "113"]
[WhiteType "human"]
[BlackType "human"]

1. Nh2 Kc2 2. Nf1 Kd3 3. Ng3 Kc2 4. Nh5 Kd3 5. Nf4+ Kc2 6. Nh3 Kd3 7. Ng5
Kc2 8. Nh7 Kd3 9. Nf8 Kc2 10. Nd7 Kd3 11. Nb8 Kc2 12. Na6 Kb1 (12. .. Kc1?
13. Nb4 Kb1 14. Kd2 Ka1 15. Kc1 Bxc6 16. bxc6 {#M12}) 13. Kd2 Ka1 14. Kc1
Ka2 15. Nb8 Ka1 16. Nd7 Ka2 17. Nf8 Ka1 18. Nh7 Ka2 19. Ng5 Ka1 20. Nh3 Ka2
21. Nf4 Ka1 22. Nh5 Ka2 23. Ng3 Ka1 24. Nf1 Ka2 25. Nd2 Ka1 26. Nb1 Ka2 27.
Na3 Ka1 28. Kd2 Ka2 29. Ke1 Ka1 30. Kf1 Ka2 31. Kg1 Ka1 32. Kh1 Ka2 33. Kh2
Ka1 34. Kg1 Ka2 35. Kf1 Ka1 36. Ke1 Ka2 37. Kd2 Ka1 38. Kc1 Ka2 39. Nb1 Ka1
40. Nd2 Ka2 41. Nf1 Ka1 42. Ng3 Ka2 43. Nh5 Ka1 44. Nf4 Ka2 45. Nh3 Ka1 46.
Ng5 Ka2 47. Nh7 Ka1 48. Nf8 Ka2 49. Nd7 Ka1 50. Nb8 Ka2 51.Na6 Ka1 52. Nb4 Bxc6 53. bxc6 b5 54. Na6 Ka2 55. Nc5 Ka1 56. Nxe6 Ka2 57. Nd4 Ka1 58. Nxb5
Ka2 59. Na3 Ka1 60. Nxc4 Ka2 61. Nd2 Nd6 62. exd6 cxd6 63. c7 d5 64. c8=R
d4 65. Ra8#
[/pgn]

Haven't found any solution for this position online.
Position not found in yacpdb nor in Arpad's DB.
Bring to the corner, return the N back, triangulate, send the N to
field again for the final zugzwang.

Only problem with this Mate puzzle is the 50-move-rule which is reached
because no pawns nor captures would be made within 50 moves.



Edit: Mate in 65 found with a simple edit on move 52.
52... Bxc6 53. bxc6 b5 54. Na6 Ka2 55. Nc5 Ka1 56. Nxe6 Ka2 57. Nd4 Ka1 58. Nxb5
Ka2 59. Na3 Ka1 60. Nxc4 Ka2 61. Nd2 Nd6 62. exd6 cxd6 63. c7 d5 64. c8=R
d4 65. Ra8#

According to this site,

http://www.arves.org/arves/index.php/en ... -1905-1975

(second puzzle with dia) it's from Karl Fabel. Solution- .pgn there stops just at the point, where 50-moves-boundary could be reached with 52...Nd6, an alternative move which otherwise would be mate in only 7 more moves).

50 moves- boundary is not to be counted as for studies.

[pgn]
[Event "?"]
[Site "?"]
[Date "1947.??.??"]
[Round "?"]
[White "Karl Fabel August=H"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "4n3/2p3p1/1pP1p1P1/1P1bP3/2p1p1N1/1pPkPp2/1P3P2/3NK3 w - - 0 1"]
[PlyCount "105"]
[EventDate "1947.??.??"]

1. Nh2 Kc2 2. Nf1 Kc1 3. Ng3 Kc2 4. Nh5 Kc1 5. Nf4 Kc2 6. Nh3 Kc1 7. Ng5 Kc2 8.
Nh7 Kc1 9. Nf8 Kc2 10. Nd7 Kc1 11. Nb8 Kc2 12. Na6 Kb1 13. Kd2 Ka1 14. Kc1 Ka2
15. Nb8 Ka1 16. Nd7 Ka2 17. Nf8 Ka1 18. Nh7 Ka2 19. Ng5 Ka1 20. Nh3 Ka2 21. Nf4
Ka1 22. Nh5 Ka2 23. Ng3 Ka1 24. Nf1 Ka2 25. Nd2 Ka1 26. Nb1 Ka2 27. Na3 Ka1 28.
Kd2 Ka2 29. Ke1 Ka1 30. Kf1 Ka2 31. Kg1 Ka1 32. Kh1 Ka2 33. Kh2 Ka1 34. Kg1 Ka2
35. Kf1 Ka1 36. Ke1 Ka2 37. Kd2 Ka1 38. Kc1 Ka2 39. Nb1 Ka1 40. Nd2 Ka2 41. Nf1
Ka1 42. Ng3 Ka2 43. Nh5 Ka1 44. Nf4 Ka2 45. Nh3 Ka1 46. Ng5 Ka2 47. Nh7 Ka1 48.
Nf8 Ka2 49. Nd7 Ka1 50. Nb8 Ka2 51. Na6 Ka1 52. Nb4 Bxc6 53. bxc6 1-0
[/pgn]

As you see your line and the one given at the endgame- study- site is identical disregarding the transpositions and the missing end of the latter one.

[MikeGL]

Hi Peter,

This one is beautiful N v B, and solution is almost there,
but I am stumped on the position after 5...Bd4! of
black which seems to hold and avoid mate. Already excited when I notied 5...Be5? is a blunder due to mate announcement of McBrain.

[d]q7/ppn1p2p/Pp2Np2/R6N/Bp1b1r2/kPQ5/1p6/1K6 w - - 0 1
Published as Mate in 44,
Source: ChestUCI.epd position 6290

[pgn]
[Event "Computer chess game"]
[Site "Talkchess"]
[Date "2017.08.19"]
[Round "?"]
[White "?"]
[Black "McBrain_2017"]
[Result "*"]
[WhiteElo "2400"]
[SetUp "1"]
[FEN "q7/ppn1p2p/Pp2Np2/R6N/Bp1b1r2/kPQ5/1p6/1K6 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "10"]
[WhiteType "human"]
[BlackType "human"]

1. Nhxf4 Nxe6 2. Nxe6 Bxc3 3. Nc7 bxa6 4. Nxa8 bxa5 5. Nc7 {(Be5? mate#22)}
Bd4! *
[/pgn]


Is there a win on the final position of above sequence?
Or did the engine already saw a cook with no progress for white?
[d]8/p1N1p2p/p4p2/p7/Bp1b4/kP6/1p6/1K6 w - - 2 6
This is the position after 5...Bd4 of black, is there a win?



.