Since my opponent has played in the center (1,1), I'll take the top-left corner (0,0). This is a strong strategic response to a center opening move. Playing in a corner gives me potential winning opportunities along the top row, the left column, and the diagonal from top-left to bottom-right. If my opponent doesn't block one of these potential lines, I can set up a fork that will lead to a win. Corner play also maximizes my options for future moves.