Original Edition Delta is my set of modifications (house rules) to the OD&D game,
with selected additions from the Greyhawk supplement included.
These include: (a) replacing Clerics with Thieves (that's right -- no clerics),
(b) simplified variant weapon damage and effects,
(c) lightweight "stone" encumbrance system,
(d) clarification to the combat sequence, and
(e) other mechanical streamlining (called "Target 20").
The OED house rules download is now hosted at my dedicated gaming site,
You can also get other add-ons (like a player aid card and ODT file with sidebar comments)