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Hane

 

Answers To The Hane Discussion
   

This page is fired off by the BasicInstinct page, in which the statement Answer the hane with an extension was criticized.

1. Answering the hane with an extension ?

[Diagram]
Diag.: hane -> nobi


Reasons:

  • Increases liberties
  • Threatens to cut the hane next

Exceptions:


2. Rather HaneKaeshi or CrossCut

Of course, the surrounding conditions make a big difference, but in general I think that the extension is not so good. It gives the opponent the opportunity to make good shape.

[Diagram]
Diag.: hane -> nobi? Not!

If Black continues with B 3, the shape is the same as if Black had played hane at the head of 2 stones. (See BasicInstinct 4.)

The first think I think about is a CrossCut. True, that give the opponent a chance to extend. (See BasicInstinct 3.) However, that is not so bad. You were cut, anyway. :-)

But perhaps the counter-hane should be the first thing to think about.


[Diagram]
Diag.: counter hane

[Diagram]
Diag.: counter hane (ii)

The most tempting response is to play atari-atari, but then Black has to protect his weakness with B 5. Now W 6 captures the Black stone in geta.


[Diagram]
Diag.: counter hane (ii a)

KarlKnechtel: How about this atari-atari? If black is protected on either side (e.g. by a stone at any of the marked points, or some other ladder breaker) then there is time to protect on the other, and it's like one giant crosscut. Otherwise probably not good for black overall, though.


[Diagram]
Diag.: counter hane (iii)

B 1 can atari with sente, but then Black has two cutting points at a and b to worry about.


[Diagram]
Diag.: counter hane (iv)

If Black protects, White can do the same.


[Diagram]
Diag.: counter hane (v)

If Black extends, White can play kikashi with W 2 - B 3, and then protect with the hanging connection of W 4. White treats the marked stone lightly.



[Diagram]
Diag.: Different conditions

When the marked stone is present, the nobi is a good response. One of the reasons is that if Black plays at A, he reduces his own liberties.



Statement by DieterVerhofstadt (admitting he is wrong); critics by BillSpight.



This is a copy of the living page "Answers To The Hane Discussion" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.