You play first. Put an X on the table centre
Your opponent will have to put an O somewhere.
If your opponent puts an O in a corner, you put an O in the opposite
corner. No matter what your opponent plays next, you will have an easy
win on the following move.
If your opponent puts an O on a side, you put an O on the opposite
side. If your opponent now puts either an X or an O in a corner
square, you have to ?????. So your opponent will put an ?????? of the
remaining side squares. You reply by putting an O on the opposite
side. This leaves only corner squares for your opponent and you will
get an easy win on your next move.