3-4 point low approach two-space low pincer, tenuki

White's tenuki  

If White ignores Black's pincer here, Black can continue with a or b. There are not many examples in contemporary pro games: but the variations are interesting.

Black attaches  

When is played, White has answers at a, b and c. The wedge at a depends on a good ladder for White, otherwise Black at c may be strong.

White's answer at 'a'  

This line is seen in Edo period games. The hanging connection to the second line of is typical good shape. The plays and are interesting: once White has the answer , rather than d, she stops worrying about cutting at the circled point. In the corresponding line for the one-space pincer, White is recommended to play at e, rather than the atari , accepting gote rather than give Black a thick outside position.

White's answer at 'b'  

After , leads to some tactics, pretty much a one-way street.

White's answer at 'b', continued  

This has followed, in numerous pro games. Other tries are at and at .

White's answer at 'b', continued  

This is the expected result, with Black having strong influence but White taking the corner.

White's answer at 'c'  

This is the third way to play, Black building a wall with an obvious gap.

Diagonal attachment  

If is played instead, is the normal shape to threaten on both sides.

Go-Rin  

The game Rin Kaiho-Go Seigen 1963-11-18 continued this way (colours reversed). If is at , White a Black b then at starts a difficult fight. The and combination is interesting, though it is going back to patch up.