Tesuji for settling a weak group

Today I learned a tesuji for settling a weak group from Michael Redmond’s commentary on Master(W) and bandari(B).

White has a weak group on the top needs to settle. The combination of 2 and 4 is a common tesuji.

1

What white wants is black to hane on the outside, white is planning to crosscut.

4

If black just extends, white can live on both sides.

2

If black ataris the stone, white can cut through and you can see the marked stone helps form a tiger mouth shape nicely.

3

So in the game black hanes from the inside, but white 2 is another tesuji and still manages to settle his group.

5

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