Hex (19×19)
Hex (19×19) — maximum standard size
The largest standard board size with 361 cells (matching Go’s 19×19 intersection count). Games can run well over an hour and develop extraordinary complexity. Rarely used in competitive play due to time constraints, but available for those seeking maximum strategic depth.
Differences from Standard
Same rules as 11×11 Hex (including swap rule). At this scale, local fights can be completely independent of each other for long stretches, and whole-board reading becomes impractical without deep experience. The swap rule is less decisive since even strong-looking openings leave vast unexplored territory.