Clever.  Thank you for the puzzle.

A very clever puzzle

tht was not forced

Rxg4, was not forced?  After looking at it a bit I guess I would have seen it going:

1... Nf3+ 2. Kd1 Nxg1 3. Kc1 Rc8+ 4. Nc2 Rcxc2+ 5. Kd1 Rb2 6. Ke1 Nf3+ 7.

Kd1 Rf1#

But then, I still enjoyed the puzzle.

White 1st move should be Nh3 instead of (Rook captures Knight=g4).That way White can not lose a Rook that way.

cool puzzle!