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five-line extension
Keywords: Opening
An extension of five lines on the side is easy to invade, perhaps. But Yang Yilun teaches that it is good as framework (ie with building territory in mind).
This extension may be appropriate if the first black stone doesn't need immediate support.
If Black is able to add the marked stone, this becomes a good 'tent' formation. Bill:
Black can also play at 1 (or even at a), with a good relation to the extension. According to Yang Yilun, as I have understood my son's teaching games: A five-line extension from a corner on an open side of the board is good...it allows the either the building of territory or the creation of two strong positions on the side. A five-line extension is not good if it approaches a strong position of the other player. An open side is a side of the board in which only corner plays have been made resulting in between 9 and 11 lines between the the two corner positions.
This is a copy of the living page "five-line extension" at Sensei's Library. ![]() |