I agree that the conflict was implausible, but then the magnitude and speed of growth of the main character's intelligence was already magical enough that I'd already put the whole thing into the "stories that should be judged based on the aesthetic, not anything remotely resembling plausibility" category.
http://www.infinityplus.co.uk/stories/under.htm?2. 15-30 min read time, rated "pretty good" by me.
There are a couple of interesting features of this story that I would like to discuss - but I don't want to introduce any spoilers, so I'll just leave this here for now.