Empty triangle
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
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.[1] 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.[2] 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.[3] 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.[4]
See also
- International Go Federation
References
External links
- "Empty triangle" from Sensei's Library
- "The empty triangle is bad" from Sensei's Library
- "Full triangle" from Sensei's Library
- "Good Empty Triangle" from Sensei's Library
- v
- t
- e
- Handicaps
- Komi
- Rules
- Bowls
- Goban
- Katsura
- Kaya
- Stones
- Clamshell
- Slate
- Yunzi
- Aji
- Atari
- Board positions
- Dame
- Divine move
- Double hane
- Eyes
- Gote, sente and tenuki
- Hane
- Hayago
- Jigo
- Joseki
- Kakari
- Keima
- Kiai
- Kikashi
- Ko
- Komi
- Korigatachi
- Kosumi
- Ladder
- Liberty
- Miai
- Monkey jump
- Moyo
- Myoushu
- Nakade
- Nerai
- Myoushu
- Peep
- Pincer
- Probe
- Sabaki
- Seki
- Sente
- Shape
- Shoulder hit
- Tesuji
- Thickness
- Yose
- Capturing race
- Fuseki
- Jōseki
- Nadare
- Taisha
- Ko fight
- Ladder
- Life and death
- Mirror Go
- Opening theory
- Proverbs
- Shape
- Empty triangle
- Ponnuki
- Tenuki
- Tsumego
- Classic of Arts
- Dunhuang Go Manual
- Emperor Yao
- Four Go houses
- Four arts
- Hoensha
- 9 Pin Zhi
- Oskar Korschelt
- Oshirogo
- Players
- Professional handicaps
- Go professional
- Ranks and ratings
- Dan
- Kyū
- Honorary titles
- Jubango
- Title holders
- Tournaments
- AlphaGo
- The Divine Move
- The Girl Who Played Go
- The Go Master
- The Go Player
- Go World
- Hikaru no Go
- Igo Hatsuyōron
- Long Ode to Watching Weiqi
- The MANIAC
- The Master of Go
- Ranka
- Sensei's Library
- Shibumi
- The Surrounding Game
- The Weiqi Devil
- Benson's algorithm
- Game record (kifu)
- Games played with Go equipment
- Go and mathematics
- Variants
- Batoo
- Capture go
- Sygo
Go portal
- Category