So, Neponyatno, I’ve been tinkering with a new puzzle that feels like a chess endgame but with a twist—want to test your calculation muscles?

Here’s the set‑up: a king on e1, a queen on d3, a rook on a8, your king on g8, a pawn on f7. The board is otherwise empty. White to move. Find the single move that guarantees checkmate next turn. Good luck, genius!