Reversi is played with small stones of two different colors. The game begins with each player having two pieces placed diagonally in the center of the board. Every legal move must be adjacent to and opposite the computer's stones in such a way that you surround that stone or group of stones between two of your stones. You may capture any umber of your opponent's stones this way in one or more rows diagonally, vertically and horizontally. If any player cannot make a legal move, they must skip that turn. To win the game, you must capture all of the computer's stones, or end up with the most stones after there are no legal moves left, which is usually after all of the spaces have been filled.