Object:
Standard Reversi, except that each cram square (i.e; a1/A1 to h8/H8) accepts two playing pieces. When single disks are to be placed, they must initially form a sandwich in accordance with their side of the 'cram' squares. All enemy disks that co-exist within those in-between cram squares will then be switched over.
Black and White alternate dropping single disks. Each disk must be placed (directly aligned) so that it sandwiches one or more enemy pieces between itself and another friendly piece, with no empty half-squares intervening. The sandwiched enemy pieces are flipped, changing colour. If one player can't move, he must pass his turn.
The game ends when neither side can move, usually when the whole board is filled. The winner is the player with the most on-board pieces of his colour.