[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Paths
InvasionItinerary

 

Fourth Line Invasion With One Space On Both Sides
Path: InvasionItinerary   · Prev: KeshiIsWorthAsMuchAsAnInvasion   · Next: PlaysAgainstLowChineseOpening
   

[Diagram]
Diag.: White invades

This invasion often occurs in handicap games. The most aggressive answer is one of the a points. The contact play at b will establish a connection underneath and the contact play at c will connect on top of the invading stone. Those connections are good if Black is not strong enough to attack the invasion. The one-space jump of d is a flexible answer, attacking while defending. Many players make the mistake of playing c with the intention of connecting underneath, leading to the infamous Bermuda Triangle.

A search in gobase shows that in professional games, the flexible answer at e and the territorial move at f are most often played. f has a follow-up at c, aiming at the connection underneath, wihtout getting into the Bermuda triangle.



1. The aggressive approach

[Diagram]
Diag.: Joseki

As a reference, let's look at this joseki. Black attacks from his weak side. White cuts with 4, then plays tesuji at 6. With 7, Black blocks off his larger side (typically in handicap games). After White's atari at 10 ...


[Diagram]
Diag.: Continuation

... she will live locally while Black builds magnificent outward influence. Knowing this sequence and all possible variations is usually good enough to reduce the handicap.



2. Connecting underneath

[Diagram]
Diag.: Joseki

If Black wants to connect underneath, the line of play is to play 1 on top first. The ensuing hane and cuts are all natural. White gets a ponnuki and sente. In general this is regarded as a good result for White because of the influence of the ponnuki. Black's single-mindedness in keeping his territory is usually discouraged. but, it takes a skilful player with White to use the ponnuki effectively, especially since it is in atari.



2. Connecting on top

[Diagram]
Diag.: Joseki

After White's hane Black must cut at 3 and not fall into the Bermuda triangle. After the connection at 7, White can fill at 1, leaving the extensions of a miai. Black can than fix up his shape at b. If he doesn't, b becomes an interesting point for White to attack the shape.



Authors



Path: InvasionItinerary   · Prev: KeshiIsWorthAsMuchAsAnInvasion   · Next: PlaysAgainstLowChineseOpening
This is a copy of the living page "Fourth Line Invasion With One Space On Both Sides" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.