4-4 point low approach, high extension, invasion

    Keywords: Joseki
[Diagram]
4-4 point low approach, high extension, invasion  

White has three standard answers to deal with the invasion: contain B1 immediately by attaching at a, or reinforce first by attaching at b or, as surfaced from the AI revolution by forcing at c.

Other options to investigate are d, attacking B1, e dodging the invastion and f jumping out.



Attach and contain

[Diagram]
Wedge and settle  

The wedge variation usually results in White influence, while Black will settle at the , by continuing to push or jump at some point, depending on stones present to the right.

[Diagram]
Wedge and ladder issue  

White can also atari from below, resulting in a variation which can result in ko at W10 and ladder at a.



Attach and take corner

[Diagram]
Corner  

This attachment turns into a variation of the 4-4 point, low approach. With the marked stones present, White may choose to take the corner at W7 instead of connecting at B10.



Force

[Diagram]
Force  

Forcing with W1 is an AI novelty. We get a wedge variation next.



Invading

[Diagram]
Invasion  

Aside from local responses, immediately seeking compensation in the corner is possible. However, Black may turn here and confine White into the corner, especially if Black has a stone at the circled spot. After B8, White's marked stone is oddly placed.


In pro games

[Diagram]
Stretch  

From Lee Sedol's Go invasion and reduction?: White can live in Black's moyo.

[Diagram]
AI move  

When analyzing this position, LZ prefers W4 here, taking the corner and some centre influence in sente to then play W10.

[Diagram]
Clamping and sacrifice tactics  

From Takagi Kato invasion clamp and sacrifice

[Diagram]
AI likes sente  

4-4 point low approach, high extension, invasion last edited by Dieter on April 23, 2020 - 17:28
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