gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong
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As the CS saying goes, things happen 0, 1, or indefinitely many times. Why does this Sybil failure happen only twice (as opposed to every night, the prophecy not having gone off on a vacation or anything), and why is it linked with additional characters who were not also linked to the previous incident?
I don't think we should assume that. The end of 85 reads to me like a flailing optimization process that can't 'find' a natural route to changing Harry's future and is pushing absurdly improbable routes.