This was fun. I’m looking forward to the “A” episodes. I’m glad you’re using the Knuth port, as it’s more authentic to the original experience than many of the others.
But make sure you’ve got a recent-ish build to ensure you have all the bug fixes. The advent.w source that your links lead to appears to be up to date, but the nicely typeset code on Knuth’s site still has some of the bugs that have since been fixed. (And even the errata for the latest printing of the book doesn’t mention one of the fixes that was made to the sources.)
Anyway, Knuth’s is one of the more authentic ports. I say this begrudgingly. The other widely distributed ports made most of the same changes that Knuth did (dropping cave hours, using lowercase text, adding an input prompt), but they also tend to break or omit navigation features.
Then again, Knuth didn’t port the save feature (which actually wasn’t much of a feature of the program but of the operating environment), so good luck completing the game.