Microbadges:

Designer Reiner Knizia Microbadges:
(Buy One)
FAQ:
Q: Can a player finish playing his turn (placing more pieces) even if one of his placements captures the last piece of a type?
A: Yes.
http://www.boardgamegeek.com/thread/22468
Q: If nobody has the most pieces of any type, what happens?
A: It depends on the rules version you have, unfortunately. According to some versions, nobody wins (you must have the most of a type to be able to win), and according to some versions the player with the most total pieces would win. (In any case, note that tying for the most in a type is not sufficient.)
http://www.boardgamegeek.com/thread/76986
Q: Do you have to play a tile without a Japanese symbol in your turn?
A: No, you just have to play at least one tile, period.
http://www.boardgamegeek.com/article/2175611
Q: Can you really play Samurai with 4 players?
A: Yes, but many fans of the game don't recommend it.