A , 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. Etymology The term honbasho means "main (or real) tournament", and is used to distinguish these tournaments from unofficial tournaments which are held as part of sumo tours, between the six major tournaments. Such display tournaments may have prize money attached but a wrestler's performance has no effect on his ranking. This type of sumo is often called hana-sumo ( flower-sumo) as it is not taken as seriously by the wrestlers. History In the Edo period, the locations of sumo tournaments and the rikishi (sumo wrestlers) who competed in them varied. Sumo was particularly popular in the cities of Edo, Kyoto, and Osaka; with tournaments held twice a year in Edo, and once a year in both Kyoto and Osaka. The tournaments lasted 10 days each. 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