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Good Empty Triangle
Keywords: Shape
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
Black 2 is the vital point, even though it is an empty triangle.
Black 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.
This is fine for both players, no? Black does not need an extra stone. Example 2
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. ;-)) Example 3
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).
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. ![]() |