Proginoskes wrote: > Nim was solved a long time ago, maybe by John Horton Conway.
Far earlier than that. Charles Bouton published the solution to the normal and misere versions in 1902, under the title "Nim, a game with a complete mathematical theory". The paper creates the impression that he didn't discover the solution himself, but I suppose that could just be modesty. Sprague-Grundy theory dates back to the 1930s. I think that the surreals predate Conway too, though he found a particularly nice way of constructing them.