Looking at the current board state, I need to both block potential wins for X and create winning opportunities for myself. 

X has placed marks at positions (1,1) and (2,2), forming a diagonal. If X gets position (0,0), they would win with a diagonal line. However, (0,0) is already occupied by my O.

My strategy will be to place an O at position (2,0) (bottom-left). This creates two potential winning paths for me:
1. A vertical line at the left column (0,0)-(1,0)-(2,0) if I can get position (1,0) in my next move
2. A diagonal line from (2,0)-(1,1)-(0,2) if I can get position (0,2) in my next move

This move doesn't directly block any immediate threat from X, but it sets up multiple winning possibilities for me, forcing X to play defensively on their next turn.