Copyright (c) 1990 Fred Horn
The game starts on an empty Go board.
There are enough 2x1 stones (like dominoes) of two colors.
- CELL CONTROL - A cell is controlled by a player if that cell
is empty and is orthogonally adjacent only to, at least, one of that
- This means that any empty cell not adjacent to any stone or adjacent
to both player's stones, is not controlled by anyone.
- TURN - A player drops a
friendly stone on two orthogonal adjacent empty cells provided that
those are not (orthogonally or diagonally) adjacent to any other piece
(of either color).
- GOAL - The
player that controls more cells wins the game.
In this diagram (using a 9x9 sample
board) we see some of the
cells controlled by each player. Notice, however,
that only cells a7, a5 and g5 are permanently controlled.