Mate in 3 · No. 422 · Harder

Queen, two rooks and bishop

White to play and mate in three.

Position

White
king on b1, queen on h1, rooks on b7 and e7, bishop on b3, pawns on a2, a3 and e4
Black
king on g4, rooks on c7 and f6, pawns on d5, d6 and f4