This is the optimal move because it creates two possible winning scenarios at once (a fork). By placing my X in the bottom-right corner (2,2), I'm creating a potential winning line diagonally from top-left to bottom-right (I already have X at position 1,1). At the same time, I'm creating another potential winning line from top-right to bottom-right (I already have X at position 0,2). This forces my opponent to block one of these threats, allowing me to win with my next move on the other line. This is a winning strategy in Tic-Tac-Toe called creating a "fork" - where I establish two threats simultaneously.