Mate in 3 · No. 468 · Harder

Queen, rook and two bishops

White to play and mate in three.

Position

White
king on b1, queen on g7, rook on d3, bishops on b7 and g1, pawns on b2, c2, d4 and f4
Black
king on e6, rooks on a4 and a8, knight on f1, pawns on c5, d5, d6 and h3