Why not just stick it in the Room of Requirement or some hidden room that only the Headmaster can access (and use proper security)?
Because then (from Flamel's perspective) the Dark Lord would use the Crown of the Serpent and find that the Stone was not, in fact, at the end of the dungeon crawl, which would then nullify the purpose of the trap: to lure the Dark Lord there. (Presumably the Dark Lord would see no point in traipsing past all of those obstacles if the Stone wasn't there.)
Flamel would then insist upon the Stone being placed under Dumbledore's "best protections", meaning... huh. Is this series of obstacles really the best Dumbledore can do? For that matter, if Flamel taught Dumbledore so much of his powerful magic, presumably he/she knows much more powerful magic ("more" in terms of quantity, at least--not necessarily strength) that he/she hasn't seen fit to teach yet. Why not just protect the Stone himself?
New long chapter! Since I expect its discussion to generate more than 160 comments (which would push the previous thread over the 500 comment limit) before the next chapter is posted, here is a new thread.
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 108
(and chapter 109, once it comes out on Monday).EDIT: There have now been two separate calls for having one thread per chapter, along with a poll in this thread. If the poll in this thread indicates a majority preference for one thread per chapter by Monday, I will edit this post to make it for chapter 108 only. In that case a new thread for chapter 109 should be posted by whoever gets a chance and wants to after the chapter is released.
EDIT 2: The poll indicates a large majority (currently 78%) in favor of one thread per chapter. This post has been edited accordingly.
There is 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.)
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: