Mate in 3 · No. 414 · Harder

Queen, two rooks and knight

White to play and mate in three.

Position

White
king on g8, queen on e6, rooks on c1 and f8, knight on c5, pawns on a2, a3, c3, g2 and h2
Black
king on a7, rook on c7, pawns on a4, c6, d5 and d7