The game can be played on a range of board sizes.
9x9 should be the minimum. 11x11 allows for plenty
of rounds of attack and
counter-attack. 13x13 is professional size.
Two players take turns to
place a marble of their colour on the board shown above, initially on
the grid lines, or stacked higher when there is a base of
supporting marbles. Black goes
of Margo. Players aim to capture their
opponent's marbles and to have the majority of marbles at the
end. Marbles that are hidden
under a stack are included in the count. The game ends when a
player has no legal move.
Rule. As in the game of Go, the ko rule applies
to Margo. Positions cannot be repeated. Marbles
that are hidden underneath a stack are also considered to be an element
of the position.
Capture. As in the game of Go, self-capture is
not permitted. You may not stack a
marble unless it is connected to a live group.
You may capture an opponent group only if it has no
board-level liberties. When a group is captured all the
opponent's marbles in the stacked group that can be lifted freely are
removed. Marbles that are trapped are to remain in place. Trapped
marbles may still have an influence
later in the game.
Marbles are connected if they touch on a visible level or if
there is is no visible break in colour when viewed from above. Groups
of marbles that are
connected by a path hidden underneath a stack are counted as separate
Passing at Margo is not permitted.
The second player ( White
) has the option to swap colours immediately after the first
player has made
his first move. The first player will take the
white pieces and will play against his own first
move. The second player is given a swap option in order to
the first play advantage that the first player would otherwise have.