Section 4: Players & Officials
- Two rikishi per match (1-on-1)
- No weight classes — all rikishi within a division compete open-weight
- Divisions (highest to lowest): Makuuchi, Juryo, Makushita, Sandanme, Jonidan, Jonokuchi, Maezumo
- Within Makuuchi: ranks include Yokozuna (grand champion), Ozeki, Sekiwake, Komusubi, Maegashira
- Officials: Gyoji (referee in ceremonial robes), 5 shimpan (ringside judges who can overrule the gyoji), yobidashi (announcer + ring keeper)
- All rikishi are men in professional sumo; women are not permitted to enter the dohyo per Nihon Sumo Kyokai tradition (a controversial historic rule)