public class GridCell extends SGGroup {
 
      // ... Enum and other instance variables ... //
      private SGShape rectangle;
 
      // ... Constructor and other getters, setters ... //
 
      public SGShape getRectangle() {
         return rectangle;
      }
 
      public void setRectangle(SGShape rectangle) {
         this.rectangle = rectangle;
      }
   }

public class GridCellMouseListener extends SGMouseAdapter {
 
 
   // The background color for winning grid cells.
   private static final Color WINNERS_COLOR = new Color(195, 217, 255);
 
   // The music string to play when a winner is found.
   private static final String WINNERS_MUSIC =
      "I[64] T160 C6s*3:1+E5s*3:1 C6s*3:1+E5s*3:1 C6s*3:1+E5s*3:1 C6q+E5q G#5q+Db5q A#5q+Eb5q C6i*3:1+F5i*3:1 Ri*3:1 A#5s*3:1+Eb5s*3:1 C6h.+F5h.";
 
   // ... Constructor, instance variables and mouseClicked method ... //
 
   private void solve(GridCell gridCell) {
 
      // ... //
 
      SGGroup winnersNode = null;
      SGGroup losersNode = null;
 
      if ((rowCounts[row] == 3) && (Math.abs(rowValues[row]) == 3)) {
 
         // there's 3 values at this row and the value is either 3 or -3
         // we have a winnerFound.
         winnerFound = true;
         System.out.println("Winner " + gridCell.getValue() + " at row[" + (row + 1) + "]");
         winnersNode = new SGGroup();
         losersNode = new SGGroup();
 
         // Add all the images from GridCells in the same row to the winners node.
         for (GridCell[] rows : grid.getGridCells()) {
 
            for (GridCell sibling : rows) {
 
               if (sibling.getRow() == row) {
                  winnersNode.add(externalizeGridCellImage(sibling));
                  sibling.getRectangle().setFillPaint(WINNERS_COLOR);
               } else {
                  losersNode.add(externalizeGridCellImage(sibling));
               }
            }
         }
      }
 
      // ... Basically same thing for columns and diagonals ... //
 
      // if a winner was found, the winners node will not be null.
      if (winnersNode != null) {
 
         // add it to the gameScene.
         TicTacToe.gameScene.add(winnersNode);
         TicTacToe.gameScene.add(losersNode);
 
         // Start up the player in a separate thread so it won't freeze the UI.
         new Thread(new Runnable() {
               public void run() {
 
                  // Play the winners music.
                  Player player = new Player();
                  player.play(WINNERS_MUSIC);
               }
            }).start();
 
         final SGNode finalLosersNode = losersNode;
         SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                  // ... create blur ... //
                  blurEffect.setChild(finalLosersNode);
                  TicTacToe.gameScene.add(blurEffect);
 
                  // start an animation to blur the loser's node.
                  Clip.create(1000, gaussianBlur, "radius", 2f, 4f, 6f, 8f, 10f).start();
               }
            });
 
      }
   }
 
   // ... Update row, column and diagonal counts and values ... //
}