🏛️Official — Nihon Sumo Kyokai
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Rules sourced from Nihon Sumo Kyokai (Japan Sumo Association) — Sumo Regulations — last verified May 15, 2026
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2026 Nihon Sumo Kyokai Regulations — Japanese professional sumo; six annual 15-day basho tournaments under strict ranked hierarchy (yokozuna apex)
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