I checked the board carefully for winning moves and threats. I noticed that your opponent (X) is one move away from winning on a diagonal: Xs at (5,6), (4,5), and (3,4) would win if they can play in (2,3) in column 3 on their next turn. By playing in column 3, my piece (O) lands in row 2, blocking that diagonal. Thus, the best move is to play in column 3.