Record for longest PV I've seen (LOL)

[AdminX]

[d]8/3k1p2/5p1p/2K1p2P/4P1P1/5P2/8/8 b - - 0 41



https://en.chessbase.com/post/larissa-w ... wn-endgame

[Dann Corbit]

Here is my longest:

[d]N7/8/7k/8/4p3/4N1K1/8/8 b - - acd 127; acs 0; bm Kg5; ce -32641; dm -63; pm Kg5; pv Kg5 Nc7 Kg6 Kg4 Kf6 Kf4 Kg6 Nb5 Kh5 Nd4 Kg6 Ke5 Kf7 Kd5 Ke7 Kc6 Kf7 Kd7 Kf6 Kd6 Kf7 Ke5 Ke7 Nc6+ Kd7 Kd5 Kc7 Ne5 Kb6 Kc4 Ka5 Kc5 Ka6 N5c4 Kb7 Kd6 Kc8 Na5 Kd8 Nb7+ Ke8 Ke6 Kf8 Nd6 Kg7 Kf5 Kh7 Kf6 Kh6 Nb5 Kh5 Nc3 Kh4 Ne2 Kh5 Kf5 Kh6 Nf4 Kg7 Ke6 Kf8 Nh5 Ke8 Ng7+ Kd8 Kd6 Kc8 Ne6 Kb7 Kc5 Ka6 Kc6 Ka5 Nd4 Kb4 Nb5 Ka4 Kc5 Kb3 Kd4 Kb4 Nc7 Kb3 Ncd5 Ka4 Kc5 Ka5 Nb4 Ka4 Nc6 Ka3 Kd5 Kb3 Kd4 Ka3 Kc3 Ka4 Kc4 Ka3 Nd4 Ka4 Nb3 Ka3 Nc5 Ka2 Kb4 Ka1 Kb3 Kb1 Na6 Kc1 Kc3 Kb1 Nb4 Ka1 Kb3 Kb1 Na2 Ka1 Nc2+ Kb1 Na3+ Ka1 Nc3 e3 Nc2+;

[Dann Corbit]

I don't have any longer ones because the length of the pv string in my database is only 512 characters

[tpoppins]

Here is my longest:

[d]N7/8/7k/8/4p3/4N1K1/8/8 b - - acd 127; acs 0; bm Kg5; ce -32641; dm -63; pm Kg5; pv Kg5 Nc7 Kg6 Kg4 Kf6 Kf4 Kg6 Nb5 Kh5 Nd4 Kg6 Ke5 Kf7 Kd5 Ke7 Kc6 Kf7 Kd7 Kf6 Kd6 Kf7 Ke5 Ke7 Nc6+ Kd7 Kd5 Kc7 Ne5 Kb6 Kc4 Ka5 Kc5 Ka6 N5c4 Kb7 Kd6 Kc8 Na5 Kd8 Nb7+ Ke8 Ke6 Kf8 Nd6 Kg7 Kf5 Kh7 Kf6 Kh6 Nb5 Kh5 Nc3 Kh4 Ne2 Kh5 Kf5 Kh6 Nf4 Kg7 Ke6 Kf8 Nh5 Ke8 Ng7+ Kd8 Kd6 Kc8 Ne6 Kb7 Kc5 Ka6 Kc6 Ka5 Nd4 Kb4 Nb5 Ka4 Kc5 Kb3 Kd4 Kb4 Nc7 Kb3 Ncd5 Ka4 Kc5 Ka5 Nb4 Ka4 Nc6 Ka3 Kd5 Kb3 Kd4 Ka3 Kc3 Ka4 Kc4 Ka3 Nd4 Ka4 Nb3 Ka3 Nc5 Ka2 Kb4 Ka1 Kb3 Kb1 Na6 Kc1 Kc3 Kb1 Nb4 Ka1 Kb3 Kb1 Na2 Ka1 Nc2+ Kb1 Na3+ Ka1 Nc3 e3 Nc2+;

In plain Eng... err, I mean, SAN ;) :

1... Kg5 2. Nc7 Kg6 3. Kg4 Kf6 4. Kf4 Kg6 5. Nb5 Kh5 6. Nd4 Kg6 7. Ke5
Kf7 8. Kd5 Ke7 9. Kc6 Kf7 10. Kd7 Kf6 11. Kd6 Kf7 12. Ke5 Ke7 13. Nc6+ Kd7 14.
Kd5 Kc7 15. Ne5 Kb6 16. Kc4 Ka5 17. Kc5 Ka6 18. N5c4 Kb7 19. Kd6 Kc8 20. Na5
Kd8 21. Nb7+ Ke8 22. Ke6 Kf8 23. Nd6 Kg7 24. Kf5 Kh7 25. Kf6 Kh6 26. Nb5 Kh5
27. Nc3 Kh4 28. Ne2 Kh5 29. Kf5 Kh6 30. Nf4 Kg7 31. Ke6 Kf8 32. Nh5 Ke8 33.
Ng7+ Kd8 34. Kd6 Kc8 35. Ne6 Kb7 36. Kc5 Ka6 37. Kc6 Ka5 38. Nd4 Kb4 39. Nb5
Ka4 40. Kc5 Kb3 41. Kd4 Kb4 42. Nc7 Kb3 43. Ncd5 Ka4 44. Kc5 Ka5 45. Nb4 Ka4
46. Nc6 Ka3 47. Kd5 Kb3 48. Kd4 Ka3 49. Kc3 Ka4 50. Kc4 Ka3 51. Nd4 Ka4 52. Nb3
Ka3 53. Nc5 Ka2 54. Kb4 Ka1 55. Kb3 Kb1 56. Na6 Kc1 57. Kc3 Kb1 58. Nb4 Ka1 59.
Kb3 Kb1 60. Na2 Ka1 61. Nc2+ Kb1 62. Na3+ Ka1 63. Nc3 e3 64. Nc2# *

At 126 plies it's incidentally exactly as long Ted's. The longest I can find in my archive (after only a quick look) is a mere 94 plies:

Spassky,B - Byrne,R, Candidates qf3 1974
[d]2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - 0 50

Code: Select all

50.c5 bxc5 51.Be1 Kc7 52.Ba5+ Kb8 53.Kc4 Be7 54.Kc3 Bf6+ 55.Kd3 Bd4 56.Bd8 Bf2 57.Be7 c4+ 58.Kc3 Be1+ 59.Kxc4 Kc7 60.Bg5 Bg3 61.Bf6 Bf2 62.Bc3 Kb6 63.Bb2 Bc5 64.Bf6 Kc7 65.Bc3 Bf2 66.Ba5+ Kc8 67.Kb3 Bg3 68.Bd2 Bf2 69.Kc2 Kc7 70.Ba5+ Bb6 71.Be1 Bg1 72.Kc3 Kb6 73.Kb4 Bc5+ 74.Ka4 Be3 75.Ba5+ Kc5 76.b6 axb6 77.a7 bxa5 78.a8Q Kd4 79.Qxa5 Bxf4 80.Qb4+ Ke5 81.Kb5 Bg3 82.Kc6 Kf6 83.Qd4+ Kg5 84.Qe3+ Kg6 85.Qe7 Kh5 86.Qe8+ Kg5 87.Qd8+ Kh5 88.Qf6 f4 89.Qf7+ Kg5 90.Qe7+ Kf5 91.Qe6+ Kg5 92.Qxd6 f3 93.Qe7+ Kg6 94.Qe4+ Kf6 95.Qxf3+ Ke7 96.Qe3+ Kf8 
  +-  (50.56)   Depth: 73/112   08:51:26  730553MN, tb=2147483647

BTW, Ted: how do you make the PV line wrap around? All Chessbase GUIs I ever used display them in a single line, IIRC.

[tpoppins]

124 plies is the longest I can find in my logs:

[d]2b5/4k3/p1p1p3/P1P1P3/1PBpPK2/8/8/8 b - - 0 14

Code: Select all

Analysis by Stockfish 220117 64 POPCNT ASM:

14...Kf7 15.Kf3 Kg6 16.Ke2 Kg5 17.Kd3 Kg6 18.Ba2 Kf7 19.Bb3 Bb7 20.Kxd4 Bc8 21.Bc4 Bb7 22.Ke3 Bc8 23.Kf3 Kg6 24.Bd3 Kf7 25.Bc2 Bd7 26.Bb3 Bc8 27.Bd1 Kg6 28.Ke3 Bb7 29.Kd4 Kf7 30.Kc4 Ke7 31.Bb3 Kf7 32.Kd3 Bc8 33.Bc4 Bb7 34.Kd4 Bc8 35.Be2 Bb7 36.Ke3 Kg6 37.Kf4 Bc8 38.Bc4 Kf7 39.Bb3 Kg6 40.Ke3 Kf7 41.Bd1 Bb7 42.Bc2 Kg6 43.Bb1 Kg5 44.Kd4 Kg6 45.Kd3 Kf7 46.Kc4 Bc8 47.Kb3 Bb7 48.Bd3 Ke7 49.Kc3 Kf7 50.Kd2 Bc8 51.Be2 Ke7 52.Kc2 Kf7 53.Bc4 Bb7 54.Kd3 Bc8 55.Ba2 Ke7 56.Ke3 Kf7 57.Bb1 Ke7 58.Bc2 Kd7 59.Kd4 Ke7 60.Bd1 Kf7 61.Kc4 Kg6 62.Bg4 Kf7 63.Kd3 Kg6 64.Bh3 Kh7 65.Kd4 Kg7 66.Kc3 Kf7 67.Kd3 Kg6 68.Kc4 Kh6 69.Kc3 Bd7 70.b5 cxb5 71.c6 Bxc6 72.Bxe6 Bxe4 73.Bc8 Bc6 74.Be6 Kg6 75.Kd4 Kg5 76.Kc5 
  +- (2.92)  Depth: 119/128   13:16:13  1264803MN, tb=2147483647

[petero2]

124 plies is the longest I can find in my logs:

Longer PVs are reported here.

[MikeB]

Here is my longest:

[d]N7/8/7k/8/4p3/4N1K1/8/8 b - - acd 127; acs 0; bm Kg5; ce -32641; dm -63; pm Kg5; pv Kg5 Nc7 Kg6 Kg4 Kf6 Kf4 Kg6 Nb5 Kh5 Nd4 Kg6 Ke5 Kf7 Kd5 Ke7 Kc6 Kf7 Kd7 Kf6 Kd6 Kf7 Ke5 Ke7 Nc6+ Kd7 Kd5 Kc7 Ne5 Kb6 Kc4 Ka5 Kc5 Ka6 N5c4 Kb7 Kd6 Kc8 Na5 Kd8 Nb7+ Ke8 Ke6 Kf8 Nd6 Kg7 Kf5 Kh7 Kf6 Kh6 Nb5 Kh5 Nc3 Kh4 Ne2 Kh5 Kf5 Kh6 Nf4 Kg7 Ke6 Kf8 Nh5 Ke8 Ng7+ Kd8 Kd6 Kc8 Ne6 Kb7 Kc5 Ka6 Kc6 Ka5 Nd4 Kb4 Nb5 Ka4 Kc5 Kb3 Kd4 Kb4 Nc7 Kb3 Ncd5 Ka4 Kc5 Ka5 Nb4 Ka4 Nc6 Ka3 Kd5 Kb3 Kd4 Ka3 Kc3 Ka4 Kc4 Ka3 Nd4 Ka4 Nb3 Ka3 Nc5 Ka2 Kb4 Ka1 Kb3 Kb1 Na6 Kc1 Kc3 Kb1 Nb4 Ka1 Kb3 Kb1 Na2 Ka1 Nc2+ Kb1 Na3+ Ka1 Nc3 e3 Nc2+;

Is the ce correct?- both McB and K11.2 show this as draw using syzygy.

edit: ok - it's mate when there is no 50 move rule in play.

[Colin-G]

5 man Nalimov tablebases report this position as mate in 63

[MikeB]

5 man Nalimov tablebases report this position as mate in 63

Nalimivo by itself does not know the 50 move rule so the engine would have to account for the 50 move rule usually. That is if you want the 50 move rule to be in effect.