John Clerk was a Scottish businessman who studied many things, among them, naval warfare. His book, “An Essay on Naval Tactics,” changed how the British Navy fought Napoleon, and contributed to his defeat.
It was written without naval experience, but with a good understanding of how ships can move and damage each other. So: accurate movement restrictions, realistic measurements of giving and taking damage– it’s a game. It changed the world.
Google Books has an original edition of the book, as a PDF, free for download, at : books.google.com/books?id=LsdPpUcYxD4C. This version was printed in 1827.