Rde7# should work.
Mate from game-easy
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If you're talking about move 1, after Rde7+ Kf5 should work ;)
Sorry guess I flaked. How about 1...f5 followed by 2...Rde7#
Edit: I didn't realize you had it set up where I could move the pieces. You must think I am a bit weird to need you to tell me if I "got it". I just finished visiting "16 novelties" and "Quick Puzzle", both which strained reality.
I was glancing through some old blitz games I had saved for some reason and found this position. Can you find Black's best move? It's not hard, but it's a mating net I can't remember seeing before.