Mate in 3 · No. 16 · Harder

Queen, rook, bishop and knight

White to play and mate in three.

Position

White
king on d8, queen on h7, rook on g4, bishop on f7, knight on c5, pawns on d3, e3 and f4
Black
king on d6, rook on b3, knight on c8, pawns on a4 and c7