grodog
Hero
The "flavor" of play is usually what makes folks distinguish x.5 editions, and I tend to agree with those distinctions. To me there's a big difference between various editions as new printings (with errata incorporated, new illustrations, or just simple reprints) vs. new editions (with substantive new content). So, FWIW, here's my chronological list:
So, by my reckoning, 5.0 would be the 12th edition, unless of course the April AD&D reprints count as a new edition (and I don't think they should). And I don't count Chainmail as D&D---it's Chainmail, and useful if you're running OD&D, but on its own it's not D&D.
- OD&D
- OD&D + Greyhawk
- OD&D + Greyhawk + Other Supplements
- Holmes Basic
- AD&D 1.0 (MM through FF)
- AD&D 1.5 (UA+)
- AD&D 2.0
- AD&D 2.5 (Skills & Powers)
- D&D 3.0
- D&D 3.5
- D&D 4.0
- D&D 5.0
So, by my reckoning, 5.0 would be the 12th edition, unless of course the April AD&D reprints count as a new edition (and I don't think they should). And I don't count Chainmail as D&D---it's Chainmail, and useful if you're running OD&D, but on its own it's not D&D.