First Line Ogeima Connection

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    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.




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This is a copy of the living page "First Line Ogeima Connection" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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