Mate in 3 · No. 438 · Harder

Queen, rook and two knights

White to play and mate in three.

Position

White
king on a5, queen on e5, rook on a8, knights on b2 and h1, pawns on e2 and h3
Black
king on c6, rook on f2, knight on f4, pawns on d6 and e4