Dark moves first. Play alternates, with one move per player, per
go. Pieces may only be moved one square forward, one square diagonally
forward, or one square sideways. At no stage of the game may a piece
be moved backwards, or diagonally backwards. Pieces may not jump
over other pieces, or occupy the same square as another piece. As
soon as play commences, the unoccupied goal squares may be played
(moved on) in the same way as all the other squares.