4-4, double low approach, attach-extend, 3-3 invasion

    Keywords: Joseki
[Diagram]
4-4 point, double low approach, attach-extend, 3-3 invasion  

The 3-3 invasion of W4 is a variation of the 4-4 point, double low approach, attach-extend joseki. The typical Black responses are a and b. Black c is rarely a good choice.


[Diagram]
Block on the top side  

When W1 enters the 3-3 point, B2 and B4 is a common joseki for controlling the upper side.

[Diagram]
Block on the top side  

If Black has support at black+circle or a, then B4 will be played here instead of b to avoid overconcentration.

[Diagram]
Block on the top side  

W3 may also choose to connect, in which B4 and B6 are sort of a tesuji. After B8, if White a then Black b, and if White b then Black a, so Black may have an opportunity to attack the White stones at the top.

If W7 is played at B8, then Black c takes the corner.

[Diagram]
Block on the top side  

B6 at the 2-2 point? is also a common tesuji. Subsequently, W9 and B10 are miai.

[Diagram]
Block on the top side  

The hane at B5 here is rare in professional games, because W6 and W8 connects the corner to the top side, acquiring a sizable amount of territory and possible expansion along the top side. In compensation, Black gets a wall on the left side, but it appears inferior to White's territory.

This sequence is seen in a game between Huang Dexun (White) and Jiang Zhujiu (Black), colours reversed. The game took place in China, 1981, with Black winning by resignation.


[Diagram]
Block on the left side  

The block on the left side is usually played when there the left approach stone is also being pincered by black+circle or Black a.

[Diagram]
Block on the left side  

W6 can also choose to connect, then B7 cuts and B9 puts pressure on the three-stone White chain.


[Diagram]
Wrong block  

Blocking the 3-3 stone this way is rarely good. While White is settled on the left side, B1 did not put any pressure on the white+circle stones. Now, the white+circle stones are light and can easily be sacrificed.


See also:


4-4, double low approach, attach-extend, 3-3 invasion last edited by Unkx80 on April 18, 2009 - 20:22
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