I need to block my opponent's immediate winning threat. Currently, they have X's at positions (2,0) and (2,2) in the bottom row. If they place their X at (2,1), they would complete a horizontal row and win. Additionally, placing my O at (2,1) maintains my vertical alignment in the leftmost column (0,0 and 1,0), potentially setting up a future winning move if I can somehow get to position (2,0) (though that's currently blocked). Blocking this immediate threat is my priority.