Observed arrival · 2026-10-10

Shogi Across Impossible Boards

crabcanon.games Visit website

Editorial interest 84/100 Selection signal · not a rating of the site

Crab Canon lets you play and study shogi on Möbius, Klein, and genus-two surfaces.

Landing page captured for the 2026-10-10 issue.

For: Shogi players curious about unusual board geometry
Worth noticing: On the Möbius board, edge connections reflect pieces’ facing direction without changing their ownership.

Field notes

Play, Analyze, and Edit provide different ways to interact with a position: a game, moves for either side, or free editing. The three boards have distinct layouts, from a 9 × 11 Möbius board to two 9 × 9 charts for genus two. The page also describes keyboard navigation through the surfaces’ joins and offers local autosave plus JSON export.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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Voynich on Demand

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