I'm choosing the bottom-left position (2,0) for two key reasons:

1. Defense: My opponent has markers at (1,1) and (2,2), creating a potential diagonal threat. By placing my O at (2,0), I block their diagonal winning opportunity.

2. Offense: This move gives me two potential winning paths:
   - Down the left column (0,0 → 1,0 → 2,0)
   - Across the bottom row (2,0 → 2,1 → 2,2)

While I could have chosen (0,2) to block the same diagonal, the (2,0) position offers me more flexibility for future winning strategies.