Taking the center position is the optimal first move for me. Since my opponent (X) placed their mark in the middle-left position (1,0), I should take the center (1,1) for several strategic reasons:

1. The center position controls the most winning lines - both diagonals, the middle row, and the middle column.
2. By occupying the center, I prevent my opponent from using it to create multiple winning threats.
3. This position gives me the maximum flexibility for future moves.
4. It's generally considered the strongest position on the board, especially when it's available after the first move.

Taking the center will force my opponent to play defensively and gives me the best chance to set up multiple winning possibilities in future moves.