Mate in 1 · No. 259 · Predicted ~800

Queen and rook

White to play and mate in one.

Position

White: king on b2, queen on a7, rook on g1, pawns on a2, a3 and c4
Black: king on g8, queen on b8, rook on h8, knight on b4, pawns on e6, f7, g7, h6 and h7