Preventing the bamboo joint
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Abstract form
In its abstract form, the technique is about preventing a Black bamboo joint. The technique is illustrated in the following diagrams
The technique in action
After , a possible sequence is Black a, White b, Black c, attacking the entire White group.
As a cutting technique
From Rescue and Capture by Yang Yilun. The move captures at least five white stones, killing the white group at the edge. In this case the move is also a warikomi.
Naming
James Davies calls this the Slapping Tesuji. There is also a well-known proverb that says "grab the fourth point of a bamboo joint". This tesuji is also often a clamping tesuji as well, as it can be particularly devastating in conjunction with a stone at the circled point, aiming at the wedge of a.