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13.2 Territory, Moyo and Area

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.

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).