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Oshitsubushi
Path: GiveMeLiberties   · Prev: ConnectAndDie   · Next: ThrowIn
  Difficulty: Beginner   Keywords: Life & Death, Go term

Chinese: 胀牯牛, 胀死牛

This Japanese term describes a way of countering nakade.

[Diagram]
Black lives

B1 here lives. Black will get two eyes by playing the 1-1 point, eventually, and there is nothing White can do to prevent that. B1 prevents White from forming a killing shape by connecting the WC stones because this would be suicide, which either is forbidden or includes self-capture.

B1 is an example of oshitsubushi, pressing the opponent's stones so closely together that connection is illegal or self-capturing.


[Diagram]
Black dies

White to play can kill Black by connecting. Now White can kill Black by nakade at the 1-1 point, even if Black captures the three stones.



[Diagram]
Black dies

If Black instead captures immediately, White plays at W2 and Black will die. White shouldn't regard this as a ko fight in the corner and try to recapture: Black then gets a second chance at oshitsubushi.


[Diagram]
Black dies (continued)

B3 to capture is useless.


[Diagram]
Black dies (continued)

White throws in and Black only has a false eye here.



[Diagram]
Typical problem

W3 here doesn't understand the position. Now Black can live.


[Diagram]
Black 4 lives

Black lives with the sacrifice B4 and oshitsubushi at B6.

White should have recognised that this is a bent four in the corner position and played at B4 herself.



exswoo: Here's a fun fact. Oitsubushi literally means "chase and destroy" :)

fhayashi: Oshitsubushi is "push and smash". Oitsubushi would be "chase and smash". Maybe "squish" instead of "smash".

patrickb: "push and squish"... Hmm, I like that translation. :)


See also:



Path: GiveMeLiberties   · Prev: ConnectAndDie   · Next: ThrowIn
This is a copy of the living page "Oshitsubushi" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.