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Using the influence code, empty regions of the board are partitioned
in three ways. A vertex may be described as White or Black's
territory, moyo or area. The functions
whose_territory()
, whose_moyo()
and whose_area()
will return a color, or EMPTY if it belongs to one player or the
other in one of these classifications.
Those parts of the board which are expected to materialize as actual points for one player or the other at the end of the game are considered territory.
Those parts of the board which are either already territory or more generally places where a territory can easily materialize if the opponent neglects to reduce are considered moyo. moyo.
Those parts of the board where one player or the other has a stronger influence than his opponent are considered area.
Generally territory is moyo and moyo is area. To get a feeling for these concepts, load an sgf file in a middle game position with the option -m 0x0180 and examine the resulting diagrams (see Influential Display).