SOLUTION
White: 5 pieces (Kg7, Ni5, Bf9, Wh9, Ph6) Black: 3 pieces (Kj9, Ph7, Pj8) White to move and mate in three.
1.Ww3+ Ki9 (if 1...Kxw3 2.Bh7#) 2.Nj7 Ki8, 3.Bh7# (or 1...Ki8, 2.Bh7# Ki9, 3.Nj7#