Reversi, or Othello, is a strategy game. There are red and black pieces representing the two players. Making the first move, you must place a red piece on the board, in such a position that there exists at least one straight (horizontal, vertical, or diagonal) line between your new piece and another red piece, and with one or more contiguous black pieces between them. After placing your piece, all black pieces lying on a straight line between the new piece and any anchoring red piece will turn over and are now red. The object of the game is to have a majority of the pieces on the board, by turning over as many of the opponents pieces as possible.