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Blocking along the side
Double hanging connection
Avoid two peeps
A raw peep
The hanging connection is an application of the tiger's mouth shape and serves at least two distinct purposes: an indirect way of defending a cutting point, and a way of blocking inroads to a certain part of the board.
If White advances with , then the hanging connection of backs up to block off the upper side. As a minor setback, this allows White to play a forcing move, with the peep at a. Also, White will likely get to make the sente endgame hane one point above .
Bill: In fact, may be better at a.
In this case covers two cutting points. See trumpet connection. However, this allows for two forcing moves, at a and b:
Because a double hanging connection allows two peeps, it should often be avoided. Here , or a, might be better.
Bill: Also, is hardly forced.