Three times:
And I daresay that most wizards would be hard-pressed to name a single Dark Lady besides Baba Yaga.
(Chapter 70)
That said, I think Baba Yaga's just a shout out like Harold Shea, not an actual character in this story.
Baba Yaga has "been dead for six hundred years," and a quick Wikipedia search suggests the historical myth is first recorded in 1755, nor can I find anything particularly relating her to being from around ~1400. Nicholas Flamel is six centuries old (canonically, he was born in 1327), which means the Philosopher's Stone, if it exists, is around the same age.
Not sure what kind of coherent theory you can come up with to put it all together, though... Voldemort = Baba Yaga seems a little... silly, especially given Quirrell talking about female wiza...
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 93. The previous thread has passed 300 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.
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: