DSA-Professional was an attempt to offer experienced roleplayers of Das Schwarze Auge a more detailed rules set with more options.
Combat was expanded by maneuvers like series of attacks and parries, dodging, hit locations and more. The system of predefined spells common to older editions of DSA was substituted by one of combining three runes to create whatever spell a player desired.
To set itself apart from earlier editions of Das Schwarze Auge, DSA-Professional also introduced a new setting: The hollow world Tharun.
The game came into existence since the company Droemer Knaur, partner of publisher Schmidt Spiele, had an excess of 8000 sets of runestones and wanted a game to go with it. Schmidt had no interest in deepening the world and game system, so no products were developed beyond two boxes of core rules.
Schmidt France translated the two boxes as "L'Œil Noir - Règles avancées".