I examined the board for potential ways to force a victory quickly. Placing an X at position 2,1 creates a direct threat on the bottom row (row2) since it results in two X's (at positions 2,0 and 2,1) with an open slot at 2,2 that could give a win in the next move if not blocked. This forces the opponent to respond, setting up further winning opportunities. Hence, the move is 2,1.