Thickness arising from a sansan invasion (3)
This is what happens when White immediately makes a 3-3 point invasion. White 7 creates a weakness.
The white stone is captured in a type of net, but some aji remains. White can not run out at a immediately, however. Black is thick.
PathsThicknessExamples
Referenced byEnclosureJosekiDefectInAWall44PointEnclosureJ...