Harry Potter and the Methods of Rationality discussion thread, part 13, chapter 81

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 81, which should be pub­lished later to­day. The pre­vi­ous thread passed 400 com­ments as of the time of this writ­ing, so it will pass 500 com­ments soon af­ter the next chap­ter is posted, if not be­fore. I sug­gest re­frain­ing from com­ment­ing here un­til chap­ter 81 is posted; com­ment in the 12th thread un­til you read chap­ter 81. After chap­ter 81 is posted, I sug­gest all dis­cus­sion of pre­vi­ous guesses be kept here, with links to com­ments in the pre­vi­ous thread.

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.) When posted, chap­ter 81 should ap­pear here.

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, ten, eleven, twelve.

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.