I should place my 'O' at position (1,0) because this will immediately win the game by completing a vertical line in the left column. I already have 'O' at positions (0,0) and (2,0), so placing my third 'O' at (1,0) will give me three in a row vertically. This is the fastest path to victory since I can win in this move rather than blocking or setting up a future win.