Isn't it this? (Score 1)

I didn't see an answer posted yet. I must not have looked hard enough, I suppose. I don't think it's that hard, although I did solve a similar puzzle years ago from William Wu, which means I had already gone through this kind of process (http://www.ocf.berkeley.edu/~wwu/riddles/medium.s html).

It's a cool puzzle, and the steps you have to go through to figure it out are fun to find. The meataphysical implications of the statement kicking off the process, even though everyone knew the statement to be true before it was said, is by far the most interesting part.

On the 100th night, all blue eyed people leave the island.