Happy New Year folks! I typed up a rules primer for the various mechanics associated with underworld exploration in original Dungeons & Dragons. This was something I did for players in my current games. I like my players to be aware of the game rules so that they can make well-informed decisions during play. I thought others out there may find such a document helpful. Or not. Of course, this document will contain nothing new or exciting for those who have played the original game extensively.
Here is a link to a PDF of the document. It can also be found in my Links & Resources.
Peace & Happy New Year!
RC