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LionSMouth

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ConnectingTechniques

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ShapesAndConnections
HangingConnection
TigerShape
EyePotential
EyeShapeEyeSpaceD...
HowTheCutIsProtected
Honeycomb
ReasonsForPlaying...
DoubleHaneExample1
CounterAtari
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Trumpet connection
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    Keywords: Go term

[Diagram]
Black looks vulnerable

A white cut at a looks like a good possibility, but Black can't patch up both weaknesses in one move ... or can Black?


[Diagram]
Black is secure

By playing B1, Black creates a trumpet connection, which protects both possible sites against 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 stronger.

FCS

[Diagram]
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, a solid connection in one place would mean a White cut in the other place would be caught in a ladder. 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 real struggle for Black to stay alive.

-- Morten Pahle

Dave Sigaty: In the case where there are three BC stones the peep will not work. Black has time to answer a peep by playing at d. If there are only two BC stones, Black must answer the peep by connecting. Similar shapes but a very different result.



See also Hanging connection and Trumpet connection shape problem



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This is a copy of the living page "Trumpet connection" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.