public void declareWinner() {
        int white, black;
        white = black = 0;
        String string;

        for(int i = 0 ; i < board_row; i++) {
            for(int j = 0; j < board_col; j++) {
                ChipColor color = board_array[i][j].getChipColor();

                if(color == ChipColor.WHITE)
                    white++;
                else if(color == ChipColor.BLACK)
                    black++;
            }
        }
        if(white > black)
           this.winner_string = "You win";
        else
            this.winner_string = "You lose";
        this.winner = true;
        this.repaint();
    }