Sumo
Officially Sumō (相撲)
The national sport of Japan — two enormous rikishi try to force each other out of a straw-ring dohyō, or make any body part other than the soles of their feet touch the ground.
What is Sumo?
Sumo is an ancient Japanese sport with over 1,500 years of history, wrapped in Shintō ritual and unbroken tradition. Two wrestlers ('rikishi') collide in a circular clay dohyō barely 4.55 metres across. The bout is usually over in seconds. Modern professional sumo is administered by the Japan Sumo Association; six 15-day 'basho' tournaments are held each year and the sport crowns its yokozuna — grand champions — for life. Weight, mass and the perfect first-second stance decide most matches.
Quick facts
Category
Combat Sports
Type
Individual
Players
1 vs 1. Bouts are single-elimination within a match — no rounds.
Duration
~1 min
Where played
indoor
Field / court
dohyō
Country of origin
🇯🇵 Japan
Estimated origin
c. 3rd century (earliest written references in the Nihon Shoki)
Olympic
No
Popularity
regional
How it works
Objective
Force your opponent to either (a) step out of the dohyō, or (b) touch the ground inside the ring with any part of their body other than the soles of their feet.
Match structure
Two rikishi enter the dohyō, perform the ritual of purification (salt-throwing, four stamps), squat behind their starting lines, and charge (tachi-ai) the moment both simultaneously touch their fists to the ground. The bout ends the instant one wrestler leaves the ring or touches down.
See how it works
Reading the dohyō
Understand the ring, the starting lines, and how push-outs are judged.
Two rikishi charge from the starting lines; a push-out (yorikiri) is decided the moment one steps outside the tawara.
Rules
Basic rules
Win conditions
Push, throw or trip your opponent out of the ring, or make any part of their body other than the soles of their feet touch the clay inside the ring.
The tachi-ai
The initial charge. Both wrestlers must place both fists on the ground simultaneously; a false start (matta) is called if not synchronised.
Legal techniques
82 formal 'kimarite' (winning techniques) are recognised — pushing, shoving, throwing, tripping and belt-work are all legal.
Illegal actions
No punching with closed fists, no eye-poking, no hair-pulling, no strikes to the groin, no chokes.
Advanced rules
Mawashi grip
The belt is the primary handhold; 'migi-yotsu' (right-inside grip) vs 'hidari-yotsu' (left-inside) define a rikishi's style.
Deshimari
If a wrestler suddenly retreats (henka) at the tachi-ai and their opponent falls, they win — but this is looked down upon and rarely used by ranked wrestlers.
Winning technique announced
After each bout the announcer names the kimarite used, e.g. yorikiri (force-out), oshidashi (push-out), uwatenage (over-arm throw).
Scoring
One point (a win) per bout. A wrestler's tournament record — e.g. 10-5, 8-7 — determines promotion and demotion between ranks after each basho.
Win condition · A wrestler with a majority-winning record (kachi-koshi, 8-7 or better in the top division) is promoted or maintains their rank; a losing record (make-koshi) usually results in demotion.
Playing area
Called
dohyō
Dimensions
Circular ring 4.55 m in diameter, on a raised clay platform 66 cm high and 5.7 m square at the base.
A ring of rice-straw bales (tawara) set into a raised clay platform. The wrestlers face off from two white starting lines (shikiri-sen) 70 cm apart at the centre.
The dohyō
A 4.55 m circle of packed clay bordered by rice-straw bales (tawara), set on a raised platform. Two shikiri-sen white lines mark the starting positions.
Equipment
Mawashi
A 9 m-long silk belt wrapped around the waist and between the legs — the only garment worn, and the only legal handhold.
Dohyō
The clay ring with straw bales, built anew for every tournament.
Positions & roles
Rikishi
×1The wrestler.
Yokozuna
The highest rank — a grand champion held for life once achieved.
Ōzeki
The second-highest rank; two consecutive kachi-koshi are required to hold it.
Sekiwake / Komusubi
Junior sanyaku ranks — the challengers.
Maegashira
The rank-and-file of the top division (Makuuchi).
Officiating
The gyōji is the sole referee in the ring, with a signalling fan (gunbai). Five shimpan sit around the dohyō and can call a mono-ii to overturn a decision after video and consensus.
- Gyōji (referee — in traditional silk robes)
- Five shimpan (judges) around the dohyō
Penalties & fouls
Penalties
Matta (false start)
The gyōji (referee) restarts the bout. Repeat matta can result in a caution.
Kinjite (illegal moves)
Immediate loss and possible sanction from the association.
Fouls
Punching with closed fist
Immediate disqualification.
Hair-pulling
Immediate loss of the bout.
Attacking the groin
Illegal and results in immediate loss.
Strategies
Winning at the tachi-ai
Most bouts are decided in the first second. A lower centre of gravity and a straight-forward drive typically wins the collision.
Yotsu-zumo vs oshi-zumo
'Yotsu' rikishi seek a belt grip and grinding technique; 'oshi' rikishi push with palms and thrusts and try never to grip the belt.
Henka
Sidestepping the tachi-ai — effective but seen as cheap; a yokozuna using it would face intense public criticism.
Terminology
- Dohyō
- The elevated clay ring bordered by rice-straw bales in which bouts take place.
- Mawashi
- The heavy silk belt worn as the sole garment.
- Rikishi
- A sumo wrestler.
- Yokozuna
- The highest sumo rank — held for life once achieved.
- Kimarite
- The winning technique of a bout — 82 are officially recognised.
- Tachi-ai
- The initial simultaneous charge that begins every bout.
- Kachi-koshi / make-koshi
- Winning majority record / losing majority record in a 15-day basho.
- Gyōji
- The referee, dressed in ceremonial silk kimono.
Major competitions
Honbasho
6 tournaments per year (odd months) · Japan
The six grand tournaments: Hatsu, Haru, Natsu, Nagoya, Aki, Kyushu — each 15 days long.
Emperor's Cup
6 per year · Japan
Awarded to the makuuchi division champion of each basho.
Where it is played
Governing bodies
Japan Sumo AssociationJSA / Nihon Sumō Kyōkai
Founded 1925 · Tokyo, Japan
Official site ↗International Sumo FederationIFS
Founded 1992 · Tokyo, Japan
Famous names & records
Famous athletes
- Taihō Kōki
- Chiyonofuji Mitsugu
- Akebono Tarō
- Asashōryū Akinori
- Hakuhō Shō
- Terunofuji Haruo
Records
Most yūshō (basho titles)
Hakuhō Shō (Mongolia) — 45 titles (2021)
Longest yokozuna career
Hakuhō Shō — 14 years at yokozuna (2021)
Learn this sport
beginner
- 1What is sumo?
A one-on-one grappling sport in a 4.55 m clay ring — first to touch outside the ring, or the clay inside it with anything but the feet, loses.
- 2The dohyō and mawashi
The ring and the belt are the two icons of sumo.
- 3How to win
82 kimarite are recognised; force-outs (yorikiri) and push-outs (oshidashi) are the most common.
- 4Ranks
Six divisions; the top is Makuuchi with maegashira, sanyaku and yokozuna at the top.
Frequently asked
How long does a sumo bout last?+
Most last a few seconds. The rituals and staredown before a bout usually take much longer than the bout itself.
How heavy is a sumo wrestler?+
There is no weight class. Modern top-division rikishi typically weigh 120–200 kg; the heaviest have exceeded 275 kg.
Are foreigners allowed in professional sumo?+
Yes, but with strict rules — each stable is limited to one foreign-born wrestler. Mongolians have dominated the highest ranks over the past two decades.
Sources & provenance
- Japan Sumo Association — Official Rules— Nihon Sumō Kyōkai
- Britannica — Sumo— Encyclopaedia Britannica