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EmptyTriangle

 

Good Empty Triangle
   

Efficiency is one aspect of shape. Late in the game, especially, it can be obviously correct to make an empty triangle and making an empty triangle can also be the vital point.

Example 1

[Diagram]
Diag.: Joseki

Black 2 is the vital point, even though it is an empty triangle.


[Diagram]
Diag.: Related joseki

B 2 makes "good shape" but becomes overconcentrated.

unkx80: I don't think it's so much about overconcentration. I believe that it's got more to do with destroying White's eye shape. :-)

Bill: Well, it is a question of emphasis, isn't it? Anyway, let's take away the marked black stone.


[Diagram]
Diag.: Mutual good shape

This is fine for both players, no? Black does not need an extra stone. :-)



Example 2

[Diagram]
Diag.: Black to play

This problem comes from the Tesuji Dictionary, by Segoe Kensaku and Go Seigen. They say that if you get this one right, you are 5 dan. (Of course, you have a big hint. ;-))

Solution



Example 3

[Diagram]
Diag.: Good empty triangle

The sequence of White 1 to 5 is one of the best ways of escaping with the lone white stone at the top. 5 makes the empty triangle and then White has a rather clear exit, while aiming for the cutting point at a (at the correct time).


[Diagram]
Diag.: Bad empty triangle

White 3 here would be a mistake. Black 4 plays at the vital point, destroying White's eye shape, and forcing White 5 to connect with a bad empty triangle.



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