Oshirogo
Encyclopedia
A castle game , in relation to high-level go played in Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 during the Edo period
Edo period
The , or , is a division of Japanese history which was ruled by the shoguns of the Tokugawa family, running from 1603 to 1868. The political entity of this period was the Tokugawa shogunate....

, was an official match played by representatives of the four go houses
Four go houses
In the history of go in Japan, the Four go houses were the four academies of Go instituted, supported, and controlled by the state, at the beginning of the Tokugawa shogunate. At roughly the same time shogi was organised into three houses. Here 'house' implies institution run on the recognised...

 in the castle of the shogun
Shogun
A was one of the hereditary military dictators of Japan from 1192 to 1867. In this period, the shoguns, or their shikken regents , were the de facto rulers of Japan though they were nominally appointed by the emperor...

. In its original intention, the two players would play in the shogun's presence.

With the passage of the years, this became a formality: the players would replay a game that had already been played, and the shogun would often be represented by an official, rather than attend himself. The games themselves were, though, bitterly contested, since the castle games had a major effect on the prestige of the four houses. Throughout the Tokugawa shogunate
Tokugawa shogunate
The Tokugawa shogunate, also known as the and the , was a feudal regime of Japan established by Tokugawa Ieyasu and ruled by the shoguns of the Tokugawa family. This period is known as the Edo period and gets its name from the capital city, Edo, which is now called Tokyo, after the name was...

 there was an ongoing struggle to take control of the official positions of Meijin
Meijin
Meijin , literally translated, means "Brilliant Man." It is the name of the second most prestigious Japanese Go Tournament. It also refers to a traditional Japanese title given to the strongest player of the day during the Edo period.- The tournament :...

and godokoro
Godokoro
is a title that was given in Japan from the beginning of the Edo period until the Meiji Restoration. In that period it was the highest official standing that could be attained by a go player. Literally it is a metonym, meaning the 'go office'....

.

Hundreds of game records
Kifu
Kifu is the Japanese term for a game record for a game of Go or shogi. Kifu is traditionally used to record games on a grid diagram, marking the plays on the points by numbers....

 of the castle games survive; a large collection was edited by Segoe Kensaku.

The game series was suspended in 1862 as the political situation became tense. Apart from one 1863 game between Hayashi Hakuei and Yasui Sanei, it was never resumed.
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