You can use chess engines

Let me guess... they won't help wil they? There's also one too many pieces/pawns for the 6 piece tablebases to help.

Well ...

If nowbody answers I go to bed in 10 minutes

I looked at Nh2+ Kg3 and this does not seem to prevent black from queening the pawn, at least when white follows with Nf1+.  Black does need to sac. his bishop to save his pawn, prevent mate and get the queen in this scenario.

Nh2+ Ke3 looks to work out even better for black.

The idea is a fortress right?  Something like this may hold

Oops, forgot about Kg3.  Black wins easily there.

So I don't see a save for white.

1.Nh2+ Kg3 2.Bf7 a1=Q 3.Nf1+

Oh, and if king takes there's a mate.  I'm no good at spotting these weird mating nets :)

There is no mate

There is no forced mate, but the point is Kxh3 gets black mated and any other move fails to win because of that fortress.

and after 1.Nh2+ Kg3 2.Bf7 a1=Q 3.Nf1+ Kg4

?

Seems to be a language barrier (or you're not reading what I've said twice now).  I'll try a diagram.

5 ... Qd4+ 6 Kh2 Bf6, with the idea of eventually playing ...Bf6-e5+-b8-a7 and setting up a mating threat at g1, is a chance against that set-up.  Can't say I've analyzed it out to a win, though.

I dunno, at a glance it seems because the knights hit all the dark squares around white's king, black can't do anything useful.

Seems black has some good options with Bf6 or Qe1.  Black getting his King to h6 also puts more pressure on white since it eliminates any checks.