Sumo is a wrestling sport in which each competitor tries to make the other touch the ground outside the ring, or touch it inside with something other than the soles of the feet. Professional ōzumō combines these contests with ranked tournaments and ceremonial practices; amateur and women’s sumo have their own competitions.
Modern Ryōgoku Kokugikan: spectator seating surrounds the ring beneath a suspended roof.
4.55 metres in diameterProfessional ring
Six, from jonokuchi to makuuchiProfessional divisions
Six, each lasting 15 daysAnnual major tournaments
01
What decides a bout?
A bout in progress; the straw bales mark the ring boundary.
The point of contact matters
A wrestler normally loses by touching the ground outside the ring first, or by touching inside with a body part other than the soles. Simply leaning beyond the edge is not the same as touching outside. Referees judge close finishes and exceptional situations at the boundary.
Straw bales mark the circle
The professional dohyō is a clay platform with a thin layer of sand on its surface. Partly buried rice-straw bales, tawara, define a circle 4.55 metres across. A foot on a bale has not necessarily touched the ground outside it.
Match mawashi: a wrapped belt
A push is different from a prohibited blow
Open-handed pushes are allowed, while closed-fist punching, hair pulling, eye poking, throat grabbing and kicking the chest or abdomen are among the prohibited actions. Winning requires an allowed technique as well as forcing the decisive contact.
Oshidashi: pushing the opponent out with hands against the chest or underarms.Yorikiri: forcing the opponent out with close body contact.Uwatenage: an overarm belt grip used to throw the opponent.
Pushing, forcing out and throwing
Oshidashi pushes an opponent out with the hands against the chest or under the arms. Yorikiri forces the opponent out through close body contact. Uwatenage is a throw made with an outside grip on the mawashi. The official list distinguishes 82 winning techniques from five non-technique outcomes.
02
Clothing, preparation and ceremony
Ceremonial aprons worn for the ring entrance differ from the mawashi used in a bout.
One belt for wrestling, another for ceremony
For a bout, a wrestler wears a long mawashi wrapped around the waist and between the legs. The decorated keshō-mawashi belongs to ring-entering ceremonies, not the match itself. A yokozuna also wears a thick ceremonial rope for a separate ring entrance.
Salt: purification ritual
The wrestlers prepare for the initial charge
During shikiri, the wrestlers face one another and prepare to start. Lowering their fists and coordinating the tachiai brings them into the bout. Shiko leg-stamping and salt scattering are part of the surrounding practice and ceremony; they do not earn points.
Toyokuni III depicts the referee and caller announcing the following day’s bouts, 1854.
Several jobs keep the event running
The gyōji conducts the bout and indicates the winner with a gunbai fan. Ringside judges can call a monoii conference, reverse the decision or order a rematch. Yobidashi announce wrestlers and help build and maintain the ring; tokoyama dress the wrestlers’ hair.
From lowest to highest, the divisions are jonokuchi, jonidan, sandanme, makushita, jūryō and makuuchi. Yokozuna, ōzeki, sekiwake, komusubi and maegashira are ranks within makuuchi. Wrestlers in jūryō and makuuchi are called sekitori. Professional ōzumō has no weight classes.
January, May, September: Tokyo
March: Osaka · July: Nagoya · November: Fukuoka
Honbasho affects ranking; tours promote the sport
Six major tournaments through the year
The January, May and September honbasho take place in Tokyo; March is in Osaka, July in Nagoya and November in Fukuoka. Each lasts 15 days. The upper two divisions normally wrestle daily, while wrestlers in the lower four usually have seven bouts. Results help determine the next banzuke ranking sheet.
A regional tour is a different event
Jungyō tours bring sumo to regional audiences outside the six honbasho. They offer demonstrations and opportunities to see the wrestlers, rather than forming another ranking tournament in the same annual series.
04
Training in a sumo stable
Training at Musashigawa stable: two wrestlers face one another on the practice ring.
Basic movements lead into practice bouts
A heya, or stable, is a base for wrestlers’ training and daily life. Musashigawa stable’s routine includes shiko leg-stamping, sliding-foot practice, winner-stays-on bouts called mōshiai, and attacking-and-receiving drills called butsukari. The schedule varies by stable. Chanko means food prepared by wrestlers, including dishes other than hotpot.
05
From court events to public entertainment
Kawanabe Kyōsai’s nineteenth-century depiction of the legendary Sukune–Kehaya contest.
Stories and court records describe earlier contests
The Kojiki of 712 and Nihon Shoki of 720 preserve stories of contests of strength, including the legendary match between Nomi no Sukune and Taima no Kehaya. Nara- and Heian-period courts held sumai no sechie events. These accounts concern earlier contests whose practices differed from the present professional sport.
A later depiction of sumo before Oda Nobunaga; the image’s creation date is not specified.
Warriors and lords also practised and watched
From the Kamakura through the Warring States periods, warriors practised sumo as training, while lords sponsored contests. Oda Nobunaga gathered wrestlers from different regions for bouts held before him, including at Azuchi Castle.
Hiroshige’s view of sumo and spectator stands at Ryōgoku Ekōin, c. 1847–1852.
Professional wrestlers and regular events
Professional wrestling and kanjin sumo fundraising events developed during the Edo period. Regular events became established, and Ekōin in Edo served as a fixed venue from 1833. Hiroshige’s view from around 1847–1852 shows the crowded viewing areas and temporary arena.
06
The modern arena took shape gradually
1927: Tokyo and Osaka organisations merge
1928: starting lines and time limits
1931: ring enlarged to 4.55 m
1985: present Ryōgoku Kokugikan opens
Organisations and starting rules change
The association was founded in 1925, and the Tokyo and Osaka organisations merged in 1927. Shikiri time limits and starting lines were introduced in 1928. These changes helped shape the organisation of the modern professional bout.
Interior of the original Ryōgoku Kokugikan at completion in 1909; pillars support the canopy over the ring.
A wider ring and a roof without posts
The first Ryōgoku Kokugikan opened in 1909. In 1931 the ring expanded from 13 to 15 shaku, the present 4.55-metre diameter, and its double bale boundary became a single row. In 1952 the four supporting posts were replaced by a suspended roof and coloured tassels. The Kuramae arena opened in 1954; the present Ryōgoku Kokugikan followed in 1985.
07
Sumo beyond the men’s professional system
Women’s sumo attire: a mawashi worn over sports clothing.
Women compete in organised amateur sumo
Women’s sumo includes weight-class competitions, with a mawashi worn over sports clothing. Japan’s women’s federation dates its first national tournament in Osaka to 1997. Its rules and participation show why the professional men’s system does not describe every form of sumo.
What can you now explain?
Does leaning outside the ring automatically mean losing?
No. Ground contact and the circumstances of the finish matter.
What marks the edge of the professional ring?
Partly buried rice-straw bales called tawara.
Can a wrestler punch with a closed fist?
No. Closed-fist punching is prohibited, unlike allowed open-handed pushing.
Is keshō-mawashi worn for the bout?
No. It is ceremonial clothing for ring entrances.
Who can question the gyōji’s decision?
The ringside judges, through a monoii conference.
Are yokozuna and ōzeki separate divisions?
No. They are ranks within the top makuuchi division.
How often do the lower four divisions normally wrestle at a honbasho?
Usually seven bouts over the tournament.
What is the difference between honbasho and jungyō?
Honbasho are the six major ranking tournaments; jungyō are regional tours.
Has the professional ring always been today’s size?
No. Its current 4.55-metre diameter dates from the 1931 enlargement.
Does all sumo lack weight classes?
No. Professional ōzumō does, but amateur competitions, including women’s sumo, can use weight classes.