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A lead=yes, or Grand Sumo Tournament in English, is an official professional sumo tournament. Only honbasho results matter in determining promotion and relegation for rikishi (sumo wrestlers) on the banzuke ranking. The number of honbasho held every year and their length has varied; since 1958 there are six tournaments held over 15 consecutive days in four locations every year. Since 1926 the honbasho are organized by the Japan Sumo Association, after the merger of the Tokyo and Osaka sumo associations.
In 1926, the newly formed Japan Sumo Association increased the number of honbasho held each year from two to four. In 1928, they introduced rules such as marking uncontested bouts as forfeitures ( fusenshō) to help guarantee tournaments end with a clear winner. A playoff structure was implemented in 1947 to decide a champion in the case of tied records. In 1949, the length of the tournaments was extended from 10 days to 15. In 1958, the number of honbasho held each year increased again, this time to six.
Before the 19th century, a wrestler's record at a tournament was of little consequence, and promotion through the banzuke ranks was more closely tied to popularity. In 1884, the Yomiuri Shimbun began publishing rudimentary summaries of honbasho results in their newspaper. The newspaper Jiji Shinpō began offering the first award for performances in 1889, giving it to any wrestler who finished a tournament undefeated. Other newspapers quickly followed with their own awards. However, these prizes went unclaimed if no rikishi finished undefeated. Wanting a way to decide a definite winner each tournament, by 1900 daily newspapers such as the Osaka Mainichi Shimbun had begun bestowing awards on the wrestler with the best record of a honbasho. The term yūshō emerged to indicate a wrestler who had finished with a perfect record, but has since come to denote the tournament champion regardless of his record. Each division has a championship prize for the wrestler with the most wins. The winner of the top makuuchi division's honbasho receives a plethora of trophies and prizes from various organizations, regions and countries, but most notable is the 30kg sterling silver Emperor's Cup. Since 1947, three special prizes called sanshō may be awarded to wrestlers in the makuuchi division for exceptional performances during a honbasho.
Unless a playoff is required, two wrestlers will fight each other no more than once in a whole tournament. The bout schedule is set by a committee of toshiyori a day or two in advance of a tournament day and may be announced from the dohyō the day prior by a senior gyōji. Although there is no fixed method, for the first half of a tournament the top makuuchi division will generally see its higher-ranked wrestlers ( san'yaku) paired against its lower-ranked wrestlers ( maegashira), with the rest of the maegashira fighting among ranks closer in strength. The schedule for the second half of the tournament will have mainly san'yaku fighting each other, with the remainder of the ranks determined by their win–loss records up to that point. One consideration is to minimize the necessity for a tie-breaking bout, particularly if a contender for the championship is lower-ranked and has thus far faced only other lower-ranked wrestlers. In the last day, wrestlers with 7-7 records are scheduled to face each other if possible, to avoid any possibility of match-fixing where wrestlers will allow another wrestler on the border of a winning and losing record to win and achieve a kachi-koshi; wrestlers with top records will also face each other to increase the possibility of a decisive bout.
Matchmaking in the second-highest jūryō division works somewhat similarly to the top division, although there are no san'yaku. In the third-highest makushita division and below, wrestlers are matched against those with the same record almost without exception, with ranks kept as close as possible. Outside playoff bouts, neither wrestlers from the same heya (stable) nor wrestlers related by blood are scheduled to fight each other in any division.
If a wrestler has withdrawn due to injury or retirement from a scheduled bout, his opponent wins by default ( fusenshō). A loss by default is known as fusenpai. Any remaining bouts that a wrestler misses will be regarded as losses when drawing up the next tournament's rankings. If a withdrawal results in an odd number of wrestlers in one division, the schedule is filled in by pairing a lower-ranked wrestler against a higher-ranked wrestler from the next-lowest division.
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The Ryōgoku Kokugikan is owned by the Japan Sumo Association and is therefore the only venue set up for sumo all year round. Preparing the other venues for their respective honbasho begins a week in advance. 2020's July and November tournaments and the March 2021 tournament were all held at the Ryōgoku Kokugikan in Tokyo to avoid unnecessary travel during the COVID-19 pandemic in Japan.
From 1958 to 1964, the July honbasho was held at Kanayama Gymnasium. As a converted aircraft hangar, the inside became very hot, so pillars of ice would be placed in the aisles. This earned the honbasho the nickname the 熱帯場所. The following year the Nagoya tournament switched to Aichi Prefectural Gymnasium, where it stayed until 2024.
The March 2020 tournament was conducted without spectators due to the recent COVID-19 pandemic in Japan and surrounding areas. It was the first time since World War II that a basho had been closed to the general public. The move followed a request from the Japanese Government that major public events be cancelled, postponed or scaled down in order to control the spread of the virus. The Sumo Association added that if any of the wrestlers during the tournament were found to be infected with COVID-19, the rest of the tournament would have been cancelled. The May tournament that year was cancelled as the pandemic continued in Japan.
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