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In the game of Go, the empty triangle is the most fundamental example of the concept of bad shape. Three stones of one color form an empty triangle when they are placed in a triangle arrangement that fits in a 2×2 square, and when one intersection is left empty. If the triangle is filled by a stone of the opponent's at the fourth point of the 2×2, the shape is neutral – not necessarily good or bad. The Empty Triangle is also the name of a popular series of comic panels about the game of Go that features personalities from the KGS Go Server.

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  • In the game of Go, the empty triangle is the most fundamental example of the concept of bad shape. Three stones of one color form an empty triangle when they are placed in a triangle arrangement that fits in a 2×2 square, and when one intersection is left empty. If the triangle is filled by a stone of the opponent's at the fourth point of the 2×2, the shape is neutral – not necessarily good or bad. The deficiencies of the empty triangle are twofold. Three stones in a straight line have eight liberties, while in an empty triangle they have only seven. This can mean the difference between success and failure in a life-and-death struggle. Also the formation lacks efficiency. In the case cited, the diagonally adjacent stones are tactically connected without the third stone, since the opponent can't prevent them from connecting unless they are ignored for a turn. However even though the empty triangle is a prime example of bad shape, creating one could make sense, or even qualify as brilliant, in certain situations. An example of this is the third "ghost move" in the famous blood-vomiting game. The move was played by Hon'inbō Jōwa as white against Akaboshi Intetsu. The move allowed Jowa to launch a splitting attack that would ultimately lead to his victory. The Empty Triangle is also the name of a popular series of comic panels about the game of Go that features personalities from the KGS Go Server. (en)
  • 빈삼각(-三角)은 바둑에서 돌 3개가 직각으로 연달아 이어진 모양새로, 좋지 않은 모양새의 전형적인 예이다. 이 그림을 보면, 위와 같이 3개가 연달아서 이어져 있으면 활로가 8군데가 되지만, 아래와 같이 3개가 직각으로 꺾여 있으면 활로가 7군데로 줄어들게 된다. 마늘모로 연결된 두 돌 사이를 a 또는 b로 연결하는 것은 비효율적일 수 있다. (ko)
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  • 빈삼각(-三角)은 바둑에서 돌 3개가 직각으로 연달아 이어진 모양새로, 좋지 않은 모양새의 전형적인 예이다. 이 그림을 보면, 위와 같이 3개가 연달아서 이어져 있으면 활로가 8군데가 되지만, 아래와 같이 3개가 직각으로 꺾여 있으면 활로가 7군데로 줄어들게 된다. 마늘모로 연결된 두 돌 사이를 a 또는 b로 연결하는 것은 비효율적일 수 있다. (ko)
  • In the game of Go, the empty triangle is the most fundamental example of the concept of bad shape. Three stones of one color form an empty triangle when they are placed in a triangle arrangement that fits in a 2×2 square, and when one intersection is left empty. If the triangle is filled by a stone of the opponent's at the fourth point of the 2×2, the shape is neutral – not necessarily good or bad. The Empty Triangle is also the name of a popular series of comic panels about the game of Go that features personalities from the KGS Go Server. (en)
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  • Empty triangle (en)
  • 빈삼각 (ko)
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