[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Paths
ConnectingTechniques

Sub-pages
Solution1

Referenced by
ShapesAndConnections
DontPlayOnThePoin...

 

First Line Ogeima Connection
Path: ConnectingTechniques   · Prev: FirstLineConnection   · Next: TigerShape
    Keywords: Shape, Tactics

A standard way to link stones on the second line that are three points apart is to play kosumi on the first line from either:

[Diagram]
White's turn



[Diagram]
Failure



[Diagram]
Success from left



[Diagram]
Success from right

W9 connects at B2.




Although both moves connect, Sakata points out in Tesuji and Anti-Suji of Go, that b in the first diagram is clearly preferable to a.

The analysis is based on the worst case where White is forced to allow Black to play twice in a row (most likely because of a ko fight). For instance :

[Diagram]
Wasted move

(W2 elsewhere, resolves a ko)

The marked white stone is a wasted move.



[Diagram]
OK




A little problem:

[Diagram]
Can White connect unconditionally?

Solution.





Path: ConnectingTechniques   · Prev: FirstLineConnection   · Next: TigerShape
This is a copy of the living page "First Line Ogeima Connection" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.