Nine Mens Morris (Also known as Morabaraba) is a well known strategy board game played since roman times. It consists of 2 players moving their men to form mills. Mills are 3 men in a row vertically or horizontally. After forming a mill you can remove one of your opponents men. The Game is either drawn or you win by removing enough men from your opponent that he cannot create a mill.
Players try to form what is called mills, three of their own men lined up horizontally or vertically, letting a player remove an opponents man from the game. A player wins by removing all but 2 of the other players men (where he could no longer form mills and thus be unable to win), or by leaving him without a move.