public function display()
    {
        $message = '';

        $message .= $this->getLineSeparator();
        foreach ($this->board as $i => $row) {
            $message .= $this->getRow($i, $row);
        }

        $message .= $this->getPlayers();
        $message .= $this->getLastMove();

        $this->writeOutput($message);
    }