Three Pawns, One Problem

(1 + 2)

h=3

No White King

pd4 = Royal piece

Well, maybe "problem" is a pompous word for this simple puzzle of mine, but the position is nice, I think. Here it is the easy solution: 1. rpd3, h7 2. rpd2, h8=B 3. rpd1=rN, Bd4=.