Shimamura Formation
Shimamura Formation is the result of ,
and
in the diagram, first used in modern professional play by Shimamura Toshihiro in 1978. It is discussed in Charles Matthews
Fuseki on Your Side Part 7.
See also 4-4 point low approach low extension, slide, 3-3.
John F. It was played much earlier, by Sugiuchi Masao, in 1963, and even Shimamura played it earlier in 1975.