It might have been possible for Quirrellmort to win the war in a few days, but I think the implication is supposed to be that he could do so by superior inventiveness and planning ability, rather than by superior dueling power. Indeed, going by his demonstrated methods, he might have been able to defeat Dumbledore in the war in spite of dramatically less dueling power.
Minerva has apparently survived skirmishes with Voldemort where Moody or Dumbledore were at her side on different occasions, and if Voldemort could have overcome his opponents in those encounters with no risk to himself, I think he'd have had a hard time rationalizing passing up the chance.
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 109.
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.)
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: