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Osho (王将, Ōshō) is one of the seven titles in Japanese professional shogi. The tournament is co-sponsored by Sports Nippon and the Mainichi Shimbun with additional support received from the Igo & Shogi Channel. The tournament was first held in 1950 and was elevated to major title status the following year in 1951.
Contents
There is a separate tournament held each year for amateurs called the "Amateur Osho Tournament which is sponsored by the Japan Shogi Association with support from the Igo & Shogi Channel. The winner is awarded the title "Amateur Osho" (アマ王将, Ama Ōshō).
The word also refers to the piece called the "King" in shogi.
Format
The tournament is open to all shogi professionals (正棋士, Seikishi) and takes place in four stages. The first and second preliminary rounds consist of multiple single-elimination tournaments in which the first round winners advance to compete against each other in the second round. The three winners of the second round tournaments then advance to a round-robin league called the "challenger league (挑戦者決定リーグ戦, Chōsensha Kettei Rīgusen)" along with four seeded players. The winner of the challenger league then advances to a best-of-seven championship match against the reigning Osho title holder. If two players or more finish tied for first in the challenger league, a single-game playoff between the two highest seeded players is held to determine the challenger. The time controls are three hours per player for the two preliminary rounds, four hours per player for the challenger league, and eight hours per player for the championship match. The championship match is held from January to March.
Winners
The following is a list of the winners and runners-up for past Osho matches.
Records
Lifetime Osho
"Lifetime Osho" (永世王将, Eisei Ōshō) is the title given to a player who has won the championship ten times. An active player may qualify for the title, but it is only official awarded upon retirement or death. Yasuharu Oyama and Yoshiharu Habu are the only players who have qualified for this title: Oyama qualified in 1973 and Habu qualified for the title in 2007.