I analyzed the board and noticed that in column 4 the opponent already has two discs (at row5 and row4). If left unchecked, dropping another piece there would allow them to build a vertical three‐in-a-row and eventually force a win. By playing in column 4, I block that potential vertical threat and secure control of a central area. This defensive move prevents my opponent from setting up an easy win while keeping my own threats alive for future moves.