A Challenging Mate In 5-Can you find the first move?

I've created this nice mate in 5 problem that has some changed mates. The question is, can you find the the first move, aka the key?

there is mate in 5?

i don't see it can you show?

The point here is for you to solve it, or wait for someone else to! Invite your friends to have a try is you wish.

Alright i might as well find it out using engine lol I really cannot find

That's okay. Learning how to solve chess problems can take time.

engine says mate in 9...

oh at depth 48 engine say mate in 5

How can you have both white bishops on light colored squares?  c8 & f1

promoted(ik it don't make sense)

I am just guessing- Rh6 followed by Rg6 and B×g4# if after Rh6 any random move let say Ne8  , Rg6 B×e7 clearing kings path R×g4 after any blacks move Rf3 or any move on 4th rank is is Checkmate

That's not it. Keep looking!

Edited my post already

now tell what's wrong with my solution

bishop sac

Exactly which move

You leave Black's bishop unpinned and the Black king will soon get away from h3

i said that part in my solution

read it carefully