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Opposing 3-4 Points
Keywords: Opening
This formation has been studied over centuries, because first-player advantage is large. (In Japanese these parallel 3-4 points are called mukai komoku.)
This is a normal development. White breaks the symmetry in order not to play into White a, Black b which is an ideal double-purpose play of pincer combined with extension. Now we expect a pincer to be played by Black in the right-hand corner. At c has been well explored, but d and e are played now. Yang Yilun recommends f (in How to Destroy and Preserve). In the background is the press at g for Black.
In Edo period theory the high approach at
This is quite a popular diagonal fuseki in professional Go. Black plays into mukai komoku on the theory that White will take the fourth corner, leaving Black with sente on the left side. This is a copy of the living page "Opposing 3-4 Points" at Sensei's Library. ![]() |