Chess Nightmare

Here is the solution

1.Ne6 Kg8 2.Nc7 Kh8 3.Na8 Kg8 4.Ne7+ Kh8 5.Nc6 Kg8 6.Nd8 Kh8 7.Ra7 Kg8 8.Rff7 Kh8
9.Nb7 Kg8 10.Ra6 Kh8 11.Be1 Kg8 12.Bd2 Kh8 13.Bc1 Kg8 14.Bb2 Kh8 15.Ba1 Kg8 16.Qf5 Kh8 17.Qe6 Kg8 18.Kf2 Kh8 19.Kf3 Kg8 20.Kf4 Kh8 21.Kf5 Kg8 22.Qg6+ Kh8 23.Qf6+ Kg8
24.Rg7+ Kh8 25.Rg6+ Kh7 26.Qf7+ Kh8 27.Qf8+ Kh7 28.Rg7+ Kh6 29.Qf6+ Kh5 30.Qg6+ Kh4 31.Qg5+ Kh3 32.Qg4+ Kh2 33.Qg3+ Kh1 34.Qf3+ Kh2 35.Rg2+ Kh1 36.Re2+ Kg1 37.Qf2+ Kh1 38.Qh4+ Kg1 39.Qh2+ Kf1 40.Rg2+ Ke1 41.Qg3+ Kd1 42.Qf3+ Ke1 43.Qf2+ Kd1 44.Qe2+ Kc1 45.Rh2 Kb1 46.c4+!! Kc1 47.Qb2+ Kd1 48.Qc2+ Ke1 49.Re2+ Kf1 50.Re3+ Kg1 51.Qd1+ Kh2
[or 51...Kf2 52.Qe2+ Kg1] 52.Qe2+ Kh1 [or 52...Kg1 53.Qf1+ Kh2] 53.Qf1+ Kh2 54.Re2+ Kg3 55.Rg2+ Kh4 56.Qf4+ Kh5 57.Qf3+ Kh4 58.Qg3+ Kh5 59.Qg4+ Kh6 60.Qg5+ Kh7 61.Qg6+ Kh8 62.Qf6+ Kh7 63.Rh2+ Kg8 64.Qg6+ Kf8 65.Rh8+ Ke7 66.Re8+ Kd7 67.Qe6+ Kc6 68.c5!! Kxb7 69.Qd7+ Kxa6 70.c6 Ka5 71.Re7 Ka6 72.Nc7+ Ka5 73.Ne6 Ka6 74.Nd8 Ka5 75.Nb7+ Ka6 76.Rf7 Ka7 77.Nc5+ Kb8 78.Ne6 Ka8 79.Re7 Kb8 80.Qa7+ Kc8 81.Qa6+ Kb8 82.c7#