Some of the oldest chess advice : "If you find a good move, look for a better one."
In a Red Hot Pawn correspondence game, I won Black's f-pawn and looked forward to a winning ending here. I could follow all kinds of traditional advice, develop pieces, push passed pawns, rooks to open files, etc., etc.
I must admit the best move did not occur to me at all before the position had been reached, and not even then until at least 10 minutes of mentally trying out various possibilities. So no points for searing advanced tactical vision, but full points for finding it in the end.
What is it?