I'm placing my O in the middle-left position (1,0) for several strategic reasons:

1. This creates a potential winning opportunity along the left vertical column. I already have an O at (0,0), so if I can later place a third O at (2,0), I'll win.

2. It blocks a potential strategy where my opponent might try to control the left column.

3. It gives me more control of the board by occupying a second side position, which tends to create more winning opportunities than corner-only strategies.

4. While my opponent has started a diagonal from top-right to bottom-left with their X at (1,1) and (2,2), I don't need to block it immediately since they would need a third move to complete it, and I can focus on building my own winning path.