Mate in 3 · No. 512 · Harder

Queen, rook and two bishops

White to play and mate in three.

Position

White
king on f3, queen on e4, rook on c6, bishops on a8 and g8, pawns on b3, e2, f2, f4 and g3
Black
king on c3, queen on b8, rook on a3, knight on f1, pawns on a4, b4 and c4