The Shimamura Formation is the combination of the left Black shape with . The common nature of - joseki (see 4-4 point low approach low extension, slide, 3-3) allows for the formation to be easily made, thereby leading many professionals to research the position.
The first use in modern professional play was by Sugiuchi Masao, in 1963. Several years later, in 1975, Shimamura Toshihiro played it in a game with Kudo Norio. In 1978, he played it once more, and since then it has become known as the Shimamura Formation