Can you block the king if it's on check mate?

I'm pretty sure if you take his king and he doesn't know he is in checkmate, it would spark a fight. Just get someone who knows the game to referee, so the guy would know that he's a loser. Answer The rule of the game is that when a player places another player in a state of checkmate it is announced - so a person should always know that he is in checkmate. By tradition, a king is never taken.

The correct announcement of "Checkmate" ends the game. To actually take the King would be considered rude and insulting in some circles.