Good afternoon, This is a question for specifically native speakers of Hejazi Arabic ( Jeddah variety) and Syrian Arabic ( Damascus variety). Other native Arabs from these countries who are familiar with either of the two dialects or are in close proximity geographically are more than welcome to offer their expertise. In terms of having a detailed sophisticated conversation on a number of topics between two individuals who respectively speak Hejazi and Syrian Arabic; what level of understanding is their between the two in terms of an approximate percentage (without either having to water down or adjust their dialect in any way - Additionally assuming neither have had exposure to any media/programmes in the others dialect). From what I have read and been informed; the Hejazi variety is different to other Gulf/Saudi dialects and contains many elements of Egyptian/Palestinian and Syrian. Thank you.