Actually, that was suggested a while ago. :) It was one of the wilder theories; I don't think I bothered to record a prediction for it.
(IMO, I don't think it works. Consider Voldemort: he was destroyed by an Avada Kedavra and became a wandering spirit anchored by his physical Horcruxes, yes? So what would happen if he and Harry were mutual Horcruxes? You Avada Voldemort; he becomes a wandering spirit anchored by the physical living Harry; then you Avada Harry so Harry becomes a wandering spirit - but wait, there is no physical Horcrux, it was already destroyed! And with Harry now gone, so is Voldemort.)
In canon, Dumbledore claims that Voldemort's soul latched onto Harry's soul, which means that this would work. Dumbledore is very smart and knows much more about magic than I do, so I think that it would probably work.
Souls might not exist in HPMOR. But I think they very well might. Otherwise:
The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
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: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
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: