ahh see the simple game we were playing didnt have structures. it's really a problem that it's impossible to win without using silos or aircraft factories.
what i mean is that any time that your enemy gets to a place where there is one empty squard between him and your base, you just put a block in that square. rinse and repeat. he can't get past. another question we wondered: can you build off anywhere on your fort, or just the first brink that you made?
And what if he has 10 factories, and he's near enough to your base to take it out in a single turn? You can't do anything. And if he has already surrounded his base (12 symbols around it); well, then you use an airfield.