Glyfair
Explorer
MerricB said:Holmes Basic D&D was a retooling of original D&D plus some ideas from Supplement I: Greyhawk. It has very little in common with later versions of Basic D&D, and a lot in common with Original D&D. It's rather confusing, actually.
Also note that Holmes was designed in parallel with AD&D. It was supposed to lead into AD&D, but the PHB hadn't even been written for AD&D (IIRC, a month or two separate the Monster Manual release and Holmes).