Geodesics
drag to rotate · wheel to zoom · hover any dotted term, then right-click (or long-press) for the mathematics · plate readouts are click-editable before move 1

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This code encodes the board spec and every move. Send it; your opponent loads it, plays, and sends the new code back — correspondence Go on any topology, no server needed.

Or as a file: standard SGF on the classical board, generalized gSGF (readable by the python package) on every other topology.

Load a game from a code, shared URL, or pasted SGF/gSGF text: