I wouldn't say that H&C is necessarily new to the concept of Groundhog Day Attacks. If Quirrell is Voldemort and also H&C, he would not likely have a good mental model of the pure and innocent and good and upright Hermione Granger. It would take him a few tries to find the right levers to push.
But I'm not sure that Hermione isn't simply under the Imperius Curse at this point. When she's fighting Draco, she gives her wand a "mysterious flick" in a very un-Hermione-like feint. I don't know why Eliezer would deliberately place that word "mysterious" there unless he wanted to hint that Hermione isn't fully in control of her faculties.
It just occurred to me that while some artifacts have not surfaced in canon order, there's no reason other artifacts can't surface out of canon order.
What about the diary, which was apparently in the possession of Lucius in canon?
(The HPMOR discussion thread after this one is here.)
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. There haven't been any chapters recently, but it looks like there are a bunch in the pipeline and the old thread is nearing 700 comments. The latest chapter as of 7th March 2012 is Ch. 77.
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.
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.
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: