4-4, double low approach, attach-extend, 3-3 invasion
The 3-3 invasion of
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.
When
enters the 3-3 point,
and
is a common joseki for controlling the upper side.
If Black has support at
or a, then
will be played here instead of b to avoid overconcentration.
may also choose to connect, in which
and
are sort of a tesuji. After
, 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
is played at
, then Black c takes the corner.
The hane at
here is rare in professional games, because
and
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.
The block on the left side is usually played when there the left approach stone is also being pincered by
or Black a.
Blocking the 3-3 stone this way is rarely good. While White is settled on the left side,
did not put any pressure on the
stones. Now, the
stones are light and can easily be sacrificed.
See also:
![[Diagram]](../../diagrams/38/5f09bc5d4c54645322a9a9b2feced836.png)
![[Diagram]](../../diagrams/24/450239db81cf8c76e90d041455458c80.png)
![[Diagram]](../../diagrams/20/2b3857512b11e9eeca6d031cef60ebbe.png)
![[Diagram]](../../diagrams/5/10ea1df65db4f024175b91753d51ba57.png)
![[Diagram]](../../diagrams/24/f7e1337de428ed4245ec5652118ff324.png)
and
are ![[Diagram]](../../diagrams/24/f8f04d2af5dad2ddacbb5954e22fff07.png)
![[Diagram]](../../diagrams/43/e06b7cc93415efb0005284d8615bbe49.png)
![[Diagram]](../../diagrams/25/08fe0d9fc6898d610037a0214f96002b.png)
cuts and
puts pressure on the three-stone White chain.
![[Diagram]](../../diagrams/1/8dc4374c7b70398ca70a1275532b3955.png)
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published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)