The hyper-modern opening played 350 years ago Honinbo Dosaku vs. Yasui Santetsu in 1670

Yasui Santetsu Ⅱ plays a hyper-modern opening against Hononbo Dosaku in a Castle game. This kind of opening was radical even in the 20th century when Go Seigen and Kitani started the ShinFuseki movement, so it's just amazing to see this in a game from 1670.

Honinbo Dosaku (1645-1702) was an outstandingly strong player who dominated the Go scene in the 17th century. He is remembered as a theoretician who changed opening theory, but was also extremely strong in tactical fighting. While pro ranks are up to 9-dan, Dosaku has been called a 13-dan because his true strength was never fully tested by his rivals, and seemed to easily give handicaps to the best players of his time.

Yasui Santetsu Ⅱ (1639-1715) was 13 when his father Yasui Santetsu 1 died, and was considered too young to lead the Yasui school. Santetsu had some radical opening ideas that emphasized the center and sides. In this famous game he played the Tengen (center point) as his first move. When Dosaku was declared Meijin in 1678, Santetsu became 7-dan, making him one of the top players of his time. He had an interest in astronomy, and revised the Japanese calendar to become the first official astronomer recognized by the Edo government in 1685 and retired as a Go player, changing his name to Shibukawa Shunkai.

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