I should place my O at the bottom-right corner (2,2) because this will complete a diagonal line from the top-left (0,0) to the bottom-right (2,2). I already have Os at the top-left (0,0) and center (1,1) positions, so placing an O at (2,2) will create a winning diagonal and immediately win the game. This is clearly the best move because it allows me to win in a single move rather than setting up for a future win.