Mate in 3 · No. 140 · Harder

Queen, rook and knight

White to play and mate in three.

Position

White
king on g1, queen on e5, rook on h7, knight on d2, pawns on a3, e7, f4, f6 and g2
Black
king on g8, rooks on d7 and e8, bishop on f5, pawns on a6, c4 and g6