Mate in 3 · No. 408 · Harder

Queen, rook, bishop and knight

White to play and mate in three.

Position

White
king on h3, queen on h2, rook on e7, bishop on g5, knight on g4, pawns on a4, b3, e2, f4 and h4
Black
king on g6, rooks on a3 and d5, knight on g2, pawns on e3 and h7