Update: Discussion has moved on to a new thread.
The load more comments links are getting annoying (at least if you're not logged in), so it's time for a new Harry Potter and the Methods of Rationality discussion thread. We're also approaching the traditional 500-comment mark, but I think that hidden comments provide more appropriate joints to carve these threads at. So as of chapter 67, this is the place to share your thoughts about Eliezer Yudkowsky's Harry Potter fanfic.
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. The fanfiction.net author page is the central author-controlled HPMOR clearinghouse with links to the RSS feed, pdf version, TV Tropes pages, fan art, and more, and AdeleneDawner has kept an archive of Author's Notes.
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Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).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.
Is the Half-Blood, Legilimens, Snape sending a message to Quirrell with the SPHEW setup? Harry's use of Slytherin messaging and Margaret Bulstrode's Time-turner declare a Slytherin confederate, if Snape has looked. [Snape requested the check of Harry's time turner after Azkaban (para 62.99)]
"a successful Legilimens was extremely rare, rarer than a perfect Occlumens, because almost no one had enough mental discipline." (Dumbledore, Snape, Mr Bester, presumably Quirrel)
"Harry noticed that he was confused. And his threat estimate of the Head of House Slytherin shot up astronomically."
[Rianne being memory-charmed would be required for information security if she was part of the SPHEW setup using Bulstrode's time-turner, perhaps also in tuning Jaime Astorga's fall to Daphne's Most Ancient Blade.
If Hermione or another SPHEW member, (Tracey?) remembers that Quirrel has permission to teach the Killing Curse, the dynamics change.]