Shusaku opening

The Shusaku opening, or Shusaku fuseki (秀策流布石), is a traditional fuseki for black stones in the game of Go. It was developed to perfection (but not invented) by Honinbo Shusaku.

With its variants, it constituted the basis of the major theories of fuseki for nearly a century, until the 1930s, at which point the introduction of komidashi and major innovations under the shinfuseki opening occurred. However, as a testimony to its effectiveness, this type of opening is still played by professionals when playing no-komi games.

The orthodox Shusaku fuseki is as follows: