JAPANESE CULTURE, EXPLAINED
碁石
Go stones divide the two players’ pieces into black and white. A traditional Japanese high-grade pairing uses white shell and black Nachiguro stone, while glass and plastic provide other options. Matching playing functions do not require matching production processes.
Stones are placed where board lines cross, rather than inside the squares. Once placed, they do not move around the board like shogi pieces. Nihon Kiin describes a usual set as 181 black and 180 white stones. Bowls hold the supply, and their lids can hold captured stones belonging to the opponent.
Partial board diagram showing placement only, not a move sequence or shape.
Shell can retain visible grain, while black stone presents a dark surface. Common Japanese stones have a rounded, double-convex profile, with different thicknesses producing different side views. Nihon Kiin describes transferring a stone from the bowl to a hold between index and middle fingers before placing it. Shape becomes tangible in that handling.
Kuroki’s process begins by cutting circular blanks from shell and sorting them by thickness. Each face is ground into shape with water used for cooling. Bleaching and drying are followed by barrel polishing, surface finishing and inspection. Grain, thickness, flaws and colour affect selection. This is the maker’s shell process, not a description of bleaching black stones.
This maker’s shell-stone process does not describe black slate.
Nachiguro material comes from Kumano in Mie. Kuroki’s account describes splitting stone into slabs and cutting circular blanks before subsequent processing. It also records bringing some early stages in-house after 2019. The raw-material preparation therefore differs from the shell side of a paired set.
Material-state sequence only; shell bleaching is not assigned to black stones.
Kuroki dates shell-stone making in Hyuga to 1908. As local shell became scarce, much of its production shifted to Mexican shell, with product names distinguishing the source. Made in Hyuga and made from Hyuga shell are consequently different descriptions. A set connects the game to both materials and a local manufacturing history.
No. Shell and rock are one pairing; glass and plastic are also used.
No. They remain until removed under the game’s capture conditions.
No. Shell from Mexico is also processed there; source and manufacture are separate facts.