 This began the professional PBM industry in the United States.Professional game moderation started in 1971 at Flying Buffalo which added games such as "Battleplan", "Heroic Fantasy", "Starweb", and others, which by the late 1980s were all computer moderated.For approximately five years, Flying Buffalo was the single dominant company in the US PBM industry until Schubel & Son entered the field in "roughly" 1976 with the human-moderated "Tribes of Crane" game.