I need to place my X at the top-right position (0,2) to create a diagonal win. This will form a line from the top-right, through my X in the middle (1,1), to my X at the bottom-left (2,0). This is the only move among the valid options that creates an immediate win. The other options (0,1 and 1,2) don't create winning lines and would allow my opponent to potentially block or create their own winning opportunities.