That is indeed a good way of hedging your bets, and I agree that it works very well in the context of the world ending. However, I'm not sure Harry can even call it "very likely" that the Death Eaters won't die within the day; the probability that someone ends up killing them is nontrivial. (Of course, I'm aware that your suggestion doesn't include anything about the Death Eaters' well-being; I'm just talking about the statement I originally suggested, more for the sake of argument than anything else.)
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 113.
There is 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.)
IMPORTANT -- From the end of chapter 113: