Reversi is a board game which was developed in the 19th century. Players use black and white stones, and try to take over as much area of the board as possible. How to Play: Black plays first. The player puts a black stone on the board in a position so that there is a white stone between it and another black stone on the board. The player then turns over all the white stones that exist in straight lines between the new stone and any black stone already on the board. This includes vertical, horizontal, and diagonal lines, in all eight directions.Players continue doing this in turn. If a valid space for a player's stone exists, the player must play it. If there are no spaces to play, he may pass. Passes can be made as many times as necessary, but play goes to the opponent each time. The game is over when the board is completely full, or there are no possible moves left for either player. The player with the more stones on the board is the winner.