I am not sure what the problem is here. I tested this position a hundred times against multiple opponents and never saw a loss or draw by any program for the winning side. The knight is captured well before the 50 move rule limit with optimal play (here is Crafty's output from the starting position:Laskos wrote:I am worried about my tests here with egtbs, but that it's showing mate in 62 doesn't mean it actually converts it. My tests were Houdini/Shredder Nalimov versus Komodo/Stockfish Syzygy with 5 men at the root.velmarin wrote:It seems you have a configuration problem, at least in the Fritz GUI having loaded the Nalimov all engines see the mate in 62.Laskos wrote: An example:
[D]8/4K3/8/4B1n1/B7/8/5k2/8 w - - 0 1
It's a win in 62. If I am not doing anything wrong, Nalimov 3-4-5 men EGTB, at least in their implementation, fail to convert it. I checked with Houdini 4 and Shredder 12.
Nalimov online does not have a problem with any of the positions.
http://www.k4it.de/?topic=egtb&lang=en
White(1): 8/4K3/8/4B1n1/B7/8/5k2/8 w - - 0 1
White(1): egtb
1. Bf4! Nh3 2. Bh6 Ng1! 3. Kf6 Nf3! 4. Kf5! Ne1 5. Bf8 Nd3 6. Ke4!
Ne1! 7. Bc5+ Kg3! 8. Bb6 Ng2! 9. Bd1! Ne1 10. Ke3! Ng2+! 11. Kd2!
Kf4! 12. Ke2! Kf5! 13. Bc2+! Ke6! 14. Bb3+! Kf5 15. Kf3! Nh4+! 16.
Kf2! Ng6! 17. Bc2+! Kf6! 18. Bd8+! Kf7! 19. Ke3! Ne7! 20. Bb3+! Ke8!
21. Bc7! Kd7! 22. Bf4! Kc6! 23. Kd4! Nf5+ 24. Ke5! Nd6! 25. Bd5+!
Kd7! 26. Bg3! Ke7! 27. Bb3! Nf7+! 28. Ke4! Nd6+! 29. Kd5! Ne8! 30.
Ke5! Nd6! 31. Bh4+! Kd7! 32. Kd5! Nf7! 33. Ba4+! Kc7! 34. Kc5! Kc8!
35. Bg3 Kd8! 36. Kd5! Ke7! 37. Bh4+! Kf8! 38. Bf6 Nh6 39. Ke6! Ng4
40. Bb2! Nh6! 41. Bd1! Ng8! 42. Bh5! Nh6! 43. Kf6! Ng8+! 44. Kg6!
Ke7 45. Kg7! Nf6 46. Bxf6+! Ke6! 47. Bg6 Kd5 48. Kf7! Kc5 49. Be4
Kb4 50. Bd3! Ka3 51. Bc3 Ka2 52. Bc4+ Kb1 53. Bb3! Kc1 54. Ke7 Kb1
55. Kd6! Kc1 56. Kc5! Kb1 57. Kb4! Kc1 58. Ka3! Kb1 59. Bd2! Ka1
60. Bg8 Kb1 61. Bh7+! Ka1 62. Bc3#). Move 46 resets the counter.