def pgn
      pgn = Chess::Pgn.new
      pgn.moves = self.moves
      pgn.result = self.result
      return pgn
    end
def pgn
      pgn = Chess::Pgn.new
      pgn.moves = self.moves
      pgn.result = self.result
      return pgn
    end
Returns the PGN rappresenting the game.
 @return [String]