Reversi rules
Start of the game
The game is started in the position shown below on a Reversi
board consisting of 64 squares in an 8x8 grid. Squares are notated from A1 to
H8. Initial position has placed four discs. Each disc has white and black sides
and can be flipped to change top color.
To start a game, Black always moves first.
Moves
You
can play a disc when you flank one or more opponents’ discs between your new
disc and any other of your own discs, in the same horizontal, vertical or
diagonal line. The opponents discs that are flanked will be turned upside-down
and change color. This turning is called flipping.
The below picture
demonstrates situation when player performs move the first move f4 then white
disc e4 is flipped.

When discs are flanked in
multiple directions, these have to be flipped as well. The below example
demonstrates situation when white disc may be placed on e2.

Then black disks will be flipped
on c4, d3 (diagonally) and e5, e4, e3 (vertically).Â

When
there is no possible legal move, the turn is given back to the opponent. This
is called a pass. In the bellow
example white is not able to play
because he cannot flank any of the black discs with a new disc. White passes
and black will move again. After that move, white has to move. If white is
still not able to move, he will have to pass again.

If
both players need to pass because there is no possible move for any of them,
the board game has ended. Usually, this will occur when there are no more empty
squares. In some situations, one or more squares remain empty and none of the
players have perform move.
Aim of the game
The object of the game is to own
more discs than your opponent when the game is over. The game is over when
neither player has a move. Then the discs are
counted. Whoever has the most discs wins the board game. If the result is
32-32, the board game is a draw. The game also ends when the players agree to
finish the game.