From one of my games, Good luck!

I enjoyed it.  Thanks, Decoy.  I figured there was a forced mate but I can't claim I saw it clearly from the beginning.  It was pretty intuitive as I assumed I had to keep black in check or white would experience a similar problem starting with ...Rf2+.    In that sense the puzzle could also be titled, "what a difference a tempo makes!"

edit: I realize now that white has f2 guarded so there's no forced mate on white that I can see.  Good thing I didn't see that earlier.  Thinking that white was probably one tempo away from suffering a forced mate as well helped me solve the puzzle :).  Well done.

You're welcome. And 1 tempo can decide whether you win or lose indeed.