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Prevent a square



Suppose there are nine points located at (0,0) ; (1,0) ; (2,0) ; (0,1) ; (1,1) ; (2,1) ; (0,2) ; (1,2); (2,2)

Your opponent lets you move first.  You are to remove the fewest amount of points necessary to prevent your opponent from forming a square.  On their turn, they will be adding two points at a location of their choosing to build a square (if they can).

What is the least amount of points, and which ones are they, that you should remove.

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