The goal is to have the most pieces on the board when the game ends.
Pieces move like chess rooks - vertically or horizontally any distance
without jumping over any other pieces.
Capturing is a variation on the custodial version: after player A moves a piece,
any piece of player B which borders it (vertically or horizontally) and
which has 2 or more of player A's pieces as neighbors is removed from the board.
The other move possible is birth: pieces can be born on the white square at the each
player's near right. The birthing square are particular to each player,
e.g. player A cannot birth his pieces on player B's birthing square.
Passing is allowed, and the game ends with consecutive passes.