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Good Empty Triangle
Efficiency is one aspect of shape. Late in the game, especially, it can be obviously correct to make an empty triangle. Example 1
B 2 is the vital point, even though it is an empty triangle.
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.
This is fine for both players, no? Black does not need an extra stone. :-) Example 2
This problem comes from the Tesuji Dictionary, by Segoshi Kensaku and Go Seigen. They say that if you get this one right, you are 5 dan. (OC, you have a big hint. ;-)) Example 3
The sequence of white 1 to 5 is one of the best way of escaping the lone white stone at the top. After white 5 makes the empty triangle, he has a rather clear exit, while aiming for the cutting point at a (at the correct time).
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. |