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 88-89. The previous thread has passed 500 comments.
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, 16, 17, 18.
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Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).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.
Although I'm not at all sure it was deliberate (is there a way to submit potential typos?), we may have just gotten some new evidence about the true nature of magic. In Ch 89 Fred/George cast a spell solely from the memory of seeing Dumbledore cast it ("Deligitor prodi"), got the incantation wrong ("Deligitor prodeas"), and yet still achieved an (apparently) identical effect (The summoning of the Sorting Hat). It appears that if this is legitimate evidence rather than a typo, magic has an error bound for the correct pronunciation of spells.
"Prodi" is the imperative ("come forth"), "prodeas" is the subjunctive (here used in supplication, for which there is no precise English translation; perhaps "wouldst thou come forth").
Which itself suggests something quite interesting about the nature of incantations... unless it's not actually an incantation, just talking to Hogwarts in Latin.