White to move and mate. By going down the main line until crafty saw the mate and then backing up I was able to get a mate score in the starting position. From 1234 Modern Endgame Studies.
[d]8/8/8/3B2K1/8/8/5p1p/2k2Nbr w - - bm Kf6; id "MES.869";
Mat57 1. Kf6 Kc2 2. Ke7 Kd3 3. Ke6 Kc3 4. Kd7 Kb4 5. Kc6 Ka4 6. Bc4 Kb4 7. Be2 Ka5 8. Bb5 Kb4 9. Kb6 Kc3 10. Kc5 Kb3 11. Bc6 Kc3 12. Bd5 Kd3 13. Bf3 Kc3 14. Be2 Kb3 15. Bb5 Kc3 16. Bc4 Kb2 17. Kb4 Kc2 18. Bb5 Kb2 19. Ba4 Ka2 20. Bd1 Kb2 21. Bb3 Ka1 22. Kc3 Kb1 23. Bd5 Ka1 24. Bc4 Kb1 25. Nd2+ Kc1 26. Bf1 Kd1 27. Nf3 Kc1 28. Nd4 Kb1 29. Nb5 Ka1 30. Na3 Ka2 31. Nc4 Kb1 32. Kd2 Ka1 33. Kc1 Ka2 34. Kc2 Ka1 35. Kb3 Kb1 36. Nb2 Kc1 37. Kc3 Kb1 38. Nd3 Ka1 39. Kb4 Ka2 40. Ka4 Ka1 41. Ka3 Kb1
42. Kb3 Ka1 43. Nb4 Kb1 44. Na2 Ka1 45. Ka3 Kb1 46. Bd3+ Ka1 47. Nc1 f1=Q 48. Nb3#
Hard endgame study
Moderator: Ras