Mate in 3 · No. 424 · Harder

Queen, two rooks and bishop

White to play and mate in three.

Position

White
king on d8, queen on g1, rooks on a2 and d6, bishop on e5, pawns on a4 and f3
Black
king on a5, rooks on a6 and e4, pawns on a7, b6, c5 and c6