> Also, it's kind of silly to count something not have being reinvented against it, because things almost by definition cannot be reinvented.

Well, they can, but the opportunities are limited to cultures where the game has not been introduced yet.

I would also point out that we don't know that Go was never invented independently on earth, just that it was never invented and popularized in a manner that left a cultural or historic record of which we are aware. If Go were played by a small clan of prehistoric people using different color berries and a grid scratched out in the dirt, what evidence would be left?

So that REALLY limits the opportunities to cultures that left a significant historic record but had no cultural exchange with china.