I expect that the collective effect of 'everyone with more urgent life issues stays out of the effort' shifts the probabilities very little

Perhaps, but it shifts the ability of some of us to participate much more.

We've been waiting months for the latest round of chapters - giving the "final" a couple of weeks would have been more fun for me.

For the best experience, if you have not already been following Internet conversations about recent chapters, I suggest not doing so, trying to complete this exam on your own, not looking at other reviews, and waiting for Ch. 114 to see how you did.

If we wish to win, and not merely play the role of students getting a grade, we will of course collaborate.

It's strange how the student role seems to last and last and last beyond school. I see people doing it at work all the time. Though it's hard to blame them, in an institutional culture where others see your grade on the quiz as more important than getting things done. It's really odd being somewhere that asking someone who knows is considered cheating on your quiz, instead of being productive.