I'm choosing the top-left corner (0,0) as my first move. The opponent has placed their mark in the center (1,1), which is typically a strong starting position. By taking a corner, I'm setting up potential diagonal and edge winning opportunities. The top-left corner gives me flexibility to create multiple pathways to victory, either along the top row, the left column, or the top-left to bottom-right diagonal. This is a standard counter to a center opening move in Tic-Tac-Toe strategy.