Dungeons & Dragons started out as a game with such an adaptable and open-ended set of rules that early adopters questioned whether any further published RPG systems were even necessary: DMs could make D&D into anything they wanted it to be, after all. But once the Blacow model took hold, and people began to understand system design through its lens, more attention was paid to how different designs could potentially yield results for players aligned to Blacow's "forms" (wargaming, role-playin...
