Astrial (星逐) is an online Go variant played on the surface of a sphere. The board is a subdivided snub dodecahedron — an Archimedean solid — giving 302 intersections connected as a closed spherical graph. No edges, no corners, every direction is equivalent.
The topology creates a mix of 3-, 4-, and 5-degree vertices, so each point has a different number of liberties. 5-degree points border more (and larger) faces, making them the most valuable territory; 3-degree points are the easiest to surround. Scoring is area-based: the sphere's 300 quadrilateral faces are allocated proportionally to surrounding stones, with a 2.5% komi for White.
Standard Go rules apply — alternating play, capture when no liberties, no suicide, and positional Superko. The game ends on two consecutive passes.
Show HN: Astrial – Spherical Go on a Snub Dodecahedron
astrial.app