[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
ShapesAndConnections
TigerShape
DoubleHane
EyeSpace
EyePotential

 

Trumpet Connection
    Keywords: Go term

[Diagram]
Diag.: Black looks vulnerable

A white cut at 'a' looks like a good possiblity, but black can't patch up both holes in one move, or can he?


[Diagram]
Diag.: Black is secure

By playing 1, black creates a trumpet connection, which protects both possible sites for a cut.

The trumpet connection is also called the lion's mouth, and is related to the tiger shape, though the trumpet connection is much much stronger (it cannot be attacked the same way as the tiger shape).

-author: FCS

Moved groups to the third line. -- HolIgor
And I did some cleanup. --ArnoHollosi


[Diagram]
Diag.: Black is really vulnerable.

A drawback with this shape is that it still leaves a peep at 'a' or 'b'. In many situations, the solid connection (either of the circles) may be better. Also, if white cut in one place, she'd be caught in a shicho. The peeps will also rob black of eye potential, which may be relevant in other situations. In the example on the left, I think it will be a right struggle for black to stay alive.

--MortenPahle

DaveSigaty: In the case where there are 3 B stones as marked the peep will not work. B has time to answer a peep at 'd'. If there are only 2 stones, B must answer the peep by connecting. Similar shapes but a very different result.



Shape problem for illustration.

[Diagram]
Diag.: White to move

SolutionToTrumpetConnectionShapeProblem



This is a copy of the living page "Trumpet Connection" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.