[DannoHung]

This reminds me of the Blue/Brown eyed villager puzzle.

The trick is in figuring out what additional information is actually being added by whatever subsequent statements are being made.

It's weird. I usually have a lot of trouble with mathematical word puzzles. Particularly probability. But logic puzzles almost always seem to be pretty easy for me.

Now if you want a really fucking hard one, try your hand at this: http://en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever