Alpha-Beta move generator can look 2 plays (4 plies) ahead on a 4x4 board and blocks every possible attempt by the player to connect 3.

It should be possible to play on larger boards when the computers 'move' is changed from playing a tile to picking the player's next available color.

src/view/TileSelectionPanel.java

@@ -9,9 +9,10 @@ import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.SwingUtilities;
 
+import player.HumanPlayer;
+
 import controller.TSPMouseListener;
 
-import model.HumanPlayer;
 import model.Board.TileColor;
 
 public class TileSelectionPanel extends JPanel {