Update: Discussion has moved on to a new thread.
The hiatus is over with today's publication of chapter 73, and the previous thread is approaching the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it.
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. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, 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Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).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.
He's Quirrell. I more or less assume Quirrell can deduce at least a cynical caricature of any player's motives, resources and actions with a glance or two. Snape trying to double agent Quirrell and Dumbledore just seems absurd!
I'm also not sure I would quite have assigned Quirrell as the guy who needs to know about Snape's loyalties. It seems like it is Lucious who is going to be the Death Eater Lord in this one. Quirrell has a whole other game. This means that Snape still has a chance to be a double agent, so long as Quirrell doesn't meddle for fun and/or profit.
He may still be able to be a double agent in Quirrel's organization.
In canon, Voldemort knew Snape reported to Dumbledore, how could he not when Snape was spared Azkaban on Dumbledore's word that Snape was a spy. Voldemort however thought that Snape reported to Dumbledore only for the advantages it gave him, personally and in the form of information to be used for the Death Eaters, and not from any true loyalty to the Light or opposition to the Death Eaters.
Similarly, Quirrelmort knows Snape serves Dumbledore, but thinks (perhaps even correctly) that Snape... (read more)