The new thread, discussion 13, is here.
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. With three chapters recently the previous thread has very quickly reached 1000 comments. The latest chapter as of 25th March 2012 is Ch 80.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author's Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight, nine, ten, eleven.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it's fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that "Eliezer said X is true" unless you use rot13.
A lot of the previous speculation was colored by the fact that H&C #2 was insufficiently clever to be Quirrell and insufficiently efficient to be a legilimens, but since then we have found out that legilimency can be detected months later so legilimens are back on the table, and the apparent lack of cleverness could be explained as an artifact of Eliezer trying to help the reader understand what was going on in that confusing passage.
Everyone is back on the table IMO. Here's my speculation that H&C is Snape.
I find that theory extremely persuasive.
It fully explains his lack of skill in the dictionary attack, and the desperation, and sheds new light on the Quirrell/Snape forest conversation earlier.
If Quirrell knows that he has Snape as an ally (as Harry lost him given the speculation RE: Lily), and has removed Draco and Hermione from the picture (and he does seem very guilty) this seems like a relatively good time for him to come out of hiding, which also explains his behavior RE: the interrogation.