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 98. The previous thread is at nearly 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, 19, 20, 21, 22, 23, 24, 25, 26.
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Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).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.
Even ignoring the rest of the post, the idea of a Green Slytherin based off of Avada Kedavra is interesting for many reasons.
Let's look at some of the implications:
Avada Kedavra and the Patronus Charm (2.0) are basically mutually exclusive. In order to cast the first, you must want someone dead for the sake of being dead, and in order to cast the latter you must value all life to the point of denying death altogether.
Avada Kedavra and the Patronus Charm (2.0) cancel each other out. We saw this in Azkaban, and at the time we probably assumed it was just a result of Quirrell and Harry's magic going out of control, but on closer inspection it seems that both simply destroy the other, matter and antimatter style, which makes sense considering what type of magic they are created from. A magically created preference for death over life, and a magically created preference for life over death.
They both also follow the political lines, as you mention above. Avada Kedavra is more likely to be known and cast by those desperate for someone to hate, and the True Patronus is more likely to be cast by those who are trying to cooperate, simply because those mindsets are more likely to lead to those specific preferences.
Now that I think about it, the two groups are also the 'Cooperators' and the 'Defectors' in the Prisoner's Dilemma.
The interesting question is if they are going to devolve into standard Green vs Blue political idiocy. If Harry has a controlling power, they may not, but I don't think Draco has progressed enough as a rationalist to be able to avoid all those old lessons yet.
There is probably more here, but I need to sit down and think for five minutes, and do a quick read through of the archives.
It seems likely that many adult wizards (eg Snape) can cast both. Can't remember if this is the case in canon or not.