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TheEmptyTriangleI...
EmptyTriangle

 

Good Empty Triangle
   

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

Example 1:


[Diagram]
Diag.: Joseki

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


[Diagram]
Diag.: Fred Seki

If B 2 makes "good shape", he becomes overconcentrated.

unkx80: I don't thinks it's so much about overconcentration. I believe that it's more got 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 SegoshiKensaku? and GoSeiGen. They say that if you get this one right, you are 5 dan. (OC, you have a big hint. ;-))

Solution



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.