I need to block my opponent from winning with a third "O" in the left column. By placing my "X" at position (2,0), I prevent them from completing three in a row. Additionally, this creates a potential diagonal win opportunity for me in the future, as I would have "X" symbols at (1,1), (2,0), and potentially (0,2) if I can place there in a future move. Blocking the immediate threat is the priority, and this move accomplishes that while setting up future winning possibilities.