Don't descend, connect

    Keywords: Tactics
[Diagram]

Black to play

Black to play and settle the top side shape.

This situation comes from the 4-4 point, double low approach.

[Diagram]

Black to play

We commonly play at B1, but this is slow, and, if B3 is necessary, this is gote.

[Diagram]

Black to play

Instead, we play B1, which is sente. White should not omit W2 or a black play there might be sente. The other advantage of playing W2 is that it induces a cutting point at a.

Phelan: This seems to be a case of OneTwoThree.


Arieh Question - The cutting point at a seems to completely undermine the purpose of settling the shape. I'm only a beginner, but it seems to be me that if white plays a here, black is in very bad shape, so the gote play in the previous diagram is preferable. Also, I don't think white has to play 4 immediately. White can cut at a in sente, protect the cutting stone by extending and threatening white's triangle above and then play 4.

[Diagram]

Ladder

Bill: If W1 cuts, B2 can catch it in a ladder. If White tries to escape with W3, B4 continues the ladder. On an empty board White will eventually be captured. (It is possible that a White stone will break the ladder. But unless we see such a stone in a diagram, the convention is that it does not exist.)


This is a copy of the living page "Don't descend, connect" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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