the version of this I've seen before every one has blue eyes (except maybe the guru). day one some body with blue eyes looks around and knows there's at least o

the version of this I've seen before every one has blue eyes (except maybe the guru). day one some body with blue eyes looks around and knows there's at least one other person with blue eyes, so maybe the guru was talking about that person. day two no one has left so they know there's at least two people with blue eyes or else the blue eyed would have figured it out day one. of course they can still see at least two people with blue eyes, so no problem. Etc... day N hits and they come to the inescapable conclusion that they all have blue eyes and they all leave. I'm not sure how that translates to two eye colors though. I'd guess basically the same, but I'd need to think some more.