I need to block my opponent's immediate winning threat. The opponent has "O" in positions (0,0) and (0,2) - the top-left and top-right corners. If they place an "O" in position (0,1), they would win by completing the top row. 

While I don't have an immediate winning move available, blocking this threat is crucial. After this move, I can work on forming my own winning strategy, potentially through the middle column (where I'll have two positions filled) or developing other patterns. This defensive move is the highest priority to prevent an immediate loss.