I need to block my opponent's immediate threat in the left column, where they already have two Os (0,0 and 1,0). If I don't place my X at 2,0, they would win on their next move. Additionally, this move creates a potential diagonal winning opportunity for me, as I already have Xs at 0,2 (top-right) and 1,1 (center). By placing at 2,0 (bottom-left), I'm both defending against a loss and setting up a potential diagonal win on my next move.