http://playingattheworld.blogspot.no/20 ... nmail.htmlJon Peterson talks about an AC-like system for Chainmail, even using the term Armor Class, that appeared in an issue of International Wargamer. OTOH, the system starts at 1 and goes up to 8, sort of reversed from the AC system in OD&D.
From what I have heard from elsewhere, Dave Arneson was the one who introduced the descending AC system used in OD&D, which he borrowed from a naval game? It is sort of ironic if the whole AC thing came full circle with 3rd Edition....
-Havard