I'd point to a combination of (2) and (5) as the maximally likely reason we'd fail to build a generalized game playing system. I believe there exists a combina

I'd point to a combination of (2) and (5) as the maximally likely reason we'd fail to build a generalized game playing system. I believe there exists a combination of hardware and software capable of beating humans in all games. However, I also believe victory in a single game gives us minimal information on whether or not the system generalizes to many games (to say nothing of non-game, e.g. more complex, ruleless systems).