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/model/Move.java

@@ -3,9 +3,19 @@ package model;
 import model.Board.TileColor;
 
 public class Move {
+	/**
+	 * Used when genMove() is called but no valid move exists for that player.
+	 */
+	public static final Move NONE = new Move(TileColor.NONE, -1, -1);
+	
 	private final TileColor color;
 	private final CellPointer cp;
 
+	public Move(TileColor color, int row, int column) {
+		cp = new CellPointer(row,column);
+		this.color = color;
+	}
+	
 	public Move(CellPointer cllPntr, TileColor tlClr) {
 		cp = cllPntr;
 		color = tlClr;