I need to block my opponent's potential diagonal win. Currently, "X" has pieces at positions 1,1 (center) and 2,0 (bottom-left). If they place an "X" at 0,2 (top-right), they would complete a diagonal from bottom-left to top-right and win the game.

Additionally, placing my "O" at 0,2 gives me two possible ways to win in my next turn:
1. If I can later place at 0,1, I would complete the top row
2. If I can later place at 1,2 and 2,2 (though 2,2 is already taken by "X"), I could create a diagonal

This move is both defensive (blocking opponent's win) and sets up potential winning opportunities for me.