Double hane example 1

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    Keywords: Shape, Tactics

aLegendWai: A sgf file for this example is provided by me. It has more variations and comments. I hope it can illustrate better for all of the following.
Click on [ext] http://hk.geocities.com/wai_wai_sir/my_go_q/stop_en_run.zip to download.
To know how to open and view sgf file, see: [ext] http://hk.geocities.com/wai_wai_sir/htm_sub/frameset.htm (click on FAQ)


[Diagram]

Double hane on the 3rd line

Black 3 is a powerful play as it shuts White into the corner. White cannot counter Black 3.

mat But what about White a, Black b, White c? Ahhh I see (first think, then edit...): White captures 3 and Black captures the three white stones!
[Diagram]

The counter fails

Black captures the marked stones and kills the corner as well. As Black 3 in the diagram above is such a powerful play, White has actually made a mistake before and should have extended to Black 1 above herself.

Add more examples if you feel like it :o) --ArnoHollosi


aLegendWai (9k? KGS): The above is just part of the story.

[Diagram]

The counter works

It depends on the situation.
If a ladder is favorable to B, playing at b will be observed. Otherwise, a.

Even if the ladder is favorable to B, it doesn't mean W should not play in this way. W1 is used as a threat to B. When a W ladder breaker occurs, B has to capture the W stone. Otherwise you should know what to do ^^


Scartol: Well, I tried to play through the possibilities for the following question, but because of my difficulty reading, I couldn't sort it out.

[Diagram]

White lives?

Suppose White plays at 1 here, instead of a. Can Black still kill the corner?

aLegendWai(9K? KGS): W should play at [squared point] instead. Playing at 1 leaves B a chance to play useful atari.
W already live without W1.

Jan: I think the idea of the original double hane is not to kill White, but to prevent White from escaping. If Black omits 3 in the original diagram, White could later play 4 or a in the following one, for a substantial gain in territory. Your White 1 lets Black make a trumpet connection with very good thickness.

Hans: Depending on the white stones in the neighbourhood normally black should connect at a in the diagram above. Since the six white stones are very strong white cannot cut and white has only one point for playing a peep. Opinions?

[Diagram]

Single hane (3 tenuki)


aLegendWai(9K? KGS): It is my little opinion. Solid connection or trumpet connection is possible depending on whole-board situation.

[Diagram]

Solid Connection

The weakness at "a" occurs when W has a ladder breaker. Then 2 groups are separate. It doesn't automatically mean the solid connection is very wrong however. In my opinion, I think it is genereally better than the trumpet connection


The weaknesses of peep at "a" and "b" can force B in lump shape. However it is not necessarily mean B must connect when there's a peep.


[Diagram]

W's peep at A

If whole board situation favors, when W's peep at A, black may choose to play at B2 for a trick play. And force W into confusing fight. At that time, B can keep W running and build another strong wall or influence
Note: The line of play may not be optimal. It is just to show you roughly about the idea.

[Diagram]

W's peep at B

If whole board situation favors, when W's peep at B, black may choose to play at D. Even if W cut at W3, B will treat BS lightly and force W to capture it. A more horrendous wall is built.
However W is able to escape. But as I said previously, the whole-board situation may justify B to play like that (eg there're some B stones around before W peeps, so W can't really gain much from the escape).

Any comment is welcome.


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This is a copy of the living page "Double hane example 1" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.
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