Mate in 1 · No. 17 · Predicted ~500

Rook and knight

White to play and mate in one.

Position

White
king on g1, rook on h3, knight on a3, pawns on a4, e2 and e3
Black
king on f8, rook on b8, bishop on c7, pawns on b7, e7, f7, g6 and g7