It is White to play and win, but his first priority is to avoid losing: Black threatens mate in two with 1 . . . c1=N+ 2. Ka1 Ndb3. None of White's pawn promotions helps, so he must begin with a check. Having worked out that 1. Nef6+ or 1. Ndf6+ get nowhere after 1 . . . Kh4] we have only one more check left to look at, so the solution is ready to roll.
After 1. Nf4+ Black does not want the white d-pawn to queen with check. 1 . . . Kh4
2. d8=Q+ Kg3 3. Ne2+ and 4. Qxd2 or 1 . . . Kg5 2. d8=Q+ Kxf4 3. Qxd2+ win easily for White, so it has to be 1 . . . Kh6.
White must check again (2. Ne2 loses to 2 . . . Bf7+ 3. Ka1 Bd4+ with mate to follow), so it has to be 2. g8=N+, when Kh7 is forced.
Now White's horses must tread carefully to avoid each other's hoofs. The wrong way is 3. Nef6+ Kg7 4. Ne6+ Kh8 and the checks run out. So the right path must be 3. Ngf6+ Kh6 (3 . . . Kh8 4. Nxg6 is mate) 4. Nxg4+ Kh7 and only now 5. Nef6+. Now the back rank is cleared, so after 5 . . . Kg7 6. Ne6+ Black cannot retreat to h8 without allowing a fatal promotion to a queen.
So it has to be 6 . . . Kf7 when you should be able, by a process of extrapolation if nothing else, to work out the final two moves. (Solution tomorrow.)Reuse content