There was a trick, ... trying to remmeber. Havent played tic tac toe since i was kid.
I dont think its the middle square you want, and ironicly its the most alluring.
Let me see now......
A
_|_|_
_|_|_
_|_|_
B
X|_|_
_|_|_
_|_|_
C
X|_|_
_|O|_
_|_|_
D
X|_|_
_|O|_
_|_|X
E
X|_|O
_|O|_
_|_|X
F
X|_|O
_|O|_
X|_|X <----- here is where you got him, from two different ways.
EDIT:
Alternate game lets rewind, to here (E):
X|_|O
_|O|_
_|_|X
O does this instead:
X|O|_
_|O|_
_|_|X
X|O|_
_|O|_
_|X|X
X|O|_
_|O|_
O|X|X
X|O|X
_|O|_
O|X|X
X|O|X
_|O|O
O|X|X
X|O|X
X|O|O
O|X|X
Now you have a cats game. So the key im guessing is hopeing your opponent doesnt go for the obvious or the easy. But im pretty sure by doing that little strategem, you'll have one of two outcomes. You win, or you break even.
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