Net

PageType: Path   Difficulty: Introductory   Keywords: Tesuji, Tactics, Go term

Chinese: 枷/枷吃 (jia1/jia1 chi1)
Japanese: 下駄 ゲタ (geta)
Korean: 장문 (jang moon)

A net (also frequently called geta) is a technique where one or more stones are captured by enclosing them, as it were, in a net of stones which has holes in it, all of which the attacker can, however, block.

Table of contents Table of diagrams
Basic net
Capturing two stones
Atari and net
three stones
Knight’s move (__not__ problem 2083!)

[Diagram]
Basic net  

The basic form of a net is B1 in this diagram. The marked white stone now cannot escape: If White plays a, Black answers at b; if White c, then d.

[Diagram]
Capturing two stones  

Capturing two stones in a net. a and b are miai and so are c and d.

[Diagram]
Atari and net  

In this diagram, White captures the cutting stones with the combination of W1 and W3 in this diagram.



[Diagram]
three stones  

From three stones onward, the common technique of W1 for one or two stones does not work anymore. However, if white+circle were at a, then we have a position known as the crane's nest tesuji and Black's stones are captured.


Further reading

Path content

Discussion

[Diagram]
Knight’s move (not problem 2083!)  

PJTraill: How about the position in [ext] Go Problems # 2083? (Not sure if I am allowed to reproduce it here): many complain that it is a (short) ladder / shicho rather than a “geta”, which the setter calls it as of 2018-05-28. In fact it also involves a throw-in + squeezing, so I feel that “geta” is wrong. And what about the keima tesuji? on the cover of the book Tesuji by James Davies? But maybe there is no hard and fast definition of a net (and is that identical with “geta”?), and in some edge cases it is just a matter of feel.

tapir: I read this neat definition: in a ladder you increase liberties by 1, but they always get taken away again, while in a net you never get additional liberties. The Go problem #2083 is a ladder. The keima above does not fit, but looks like a net nonetheless.


Net last edited by tapir on May 29, 2018 - 22:21
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