I need to place my X at position (2,0) to complete a diagonal from top-right to bottom-left. I already have X's at the top-right (0,2) and center (1,1) positions. By placing my X at the bottom-left (2,0), I'll form a diagonal line and win the game immediately. This is the optimal move as it allows me to win in a single move rather than blocking or setting up a future win.