[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
33PointInvasion
44PointJosekis
44Point33Invasion...
33PointInvasionQu...

 

4-4 point 3-3 invasion double hane
  Difficulty: Expert   Keywords: Joseki

The Double Hane (nidan bane nee-dahn bah-neh) Variations

[Diagram]
Double hane (White 10 at 3)

Instead of B3 at W4, Black can also play the more severe move B3 shown here.

In most cases the intention is to get sente, in which Black succeeds in this diagram. W10 is forced; White cannot allow a black capture at that spot.[1] Black in turn should not omit B7 and B9, or White can come out too easily.

Grech: What if White plays W8 at B9? This also ameliorates the threat of capture from B7, and puts White ahead of Black on the third line.



What if White plays W4 at a? Can Black still take the corner back if the left side is not interesting?

[Diagram]
Double hane - Not as efficient for White

lavalyn: If White plays W8 at B9 in the above, Black can take the corner as in the variation below, but also gets a four-stone wall instead of three. W8 becomes close to a wasted move relative to the variation below.


[Diagram]
Taking the corner

Black can take the corner by playing B7 here, but giving White this ponnuki is not good in most cases.


[Diagram]
Continuation

White will most likely continue with these moves. In most cases, when White invades at the 3-3 point, Black has stones on both sides, at or around the places shown here. Black's left side stone has lost much of its value after this sequence.


[Diagram]
Double hane

Black would probably like to play the double hane of B1 in this diagram, but the marked white stones have too much aji for Black to do so. White can retake the corner - or worse.


[Diagram]
White's counter

If Black plays the double hane at B3, Black has to be prepared for this W4. White intends to give up the corner in exchange for a position on the top.


[Diagram]
Joseki

After W6 in the previous diagram, B1 is the joseki move, reaffirming the unity of the black stones. After B5, White can secure a base with a move like a or play tenuki.


[Diagram]
Slightly vulgar

B1 is vulgar[2], and White gets a relatively large corner. Still, if the upper side is important this might be playable. B3 at B7 is sometimes possible, depending on the position on the top side.



[1]

This is too dogmatic: the connection may be honte, but in many pro games not connecting has been tried.


[2] Charles Matthews This comment has gone unchallenged since the initial version of the page; but it's misleading. This atari play is recognised as joseki, but is highly sensitive to stones on the upper side, for example at a or b in this diagram.

[Diagram]
To take the outside

These plays occur in pro games. When Black plays B3, White will eventually have to live at e. Before that White has a chance of pulling out the marked stone with White c, Black d and White continuing on the third line for a while. The books teach that this is good for White if Black has a stone at b, but poor if Black has a stone at a.

If White lives immediately at e and Black tidies up by capturing at c, Black will be thick anyway (possibly slightly overconcentrated).

There's an early example in Chapter 1 of Beauty and the Beast.



This is a copy of the living page "4-4 point 3-3 invasion double hane" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.