![]() StartingPoints Aliases (info) Paths Referenced by
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two-space extension
Difficulty: Beginner
Keywords: Opening
A two-space or two-point extension (two-space jump along the third line) is often used to create a base for a group, and is the minimal base required to have a hope of creating two eyes on the edge. This is one of the most common formations in go. Because of the proximity of the edge, a two-space extension on the third line cannot be cut apart by the opponent, without other stones nearby.
After Black approaches at Extending two spaces like this isn't quite as stable as the one-point jump, but it expands further, and may create enough potential eye space for White to live.
Black cannot cut the two-point extension in this situation (should White choose to connect below).
These other two-point extensions with one stone or both on the fourth line are also useful for developing groups with a base; but they are less stable than the two-point extension on the third line, in fighting positions. See also two-space extension - unobvious answers. This is a copy of the living page "two-space extension" at Sensei's Library. ![]() |