Oshitsubushi

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  Difficulty: Beginner   Keywords: Life & Death, Go term

Chinese: 胀牯牛, (zhang4 gu3 niu2)
Chinese: 胀死牛 (zhang4 si3 niu2)
Japanese: 押し潰し (oshitsubushi)
Korean:

Oshitsubushi 押し潰し is the Japanese term that 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 W1. If Black captures the three stones, White at W1 again, holding Black to one eye.


[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. :)

NickGeorge: "Oshitsubushi" also mean that you have noticed your opponent has caught you in a subushi.

Anonymous: In Kiseido books, "Oshitsubushi" seems to be regularly translated as "crush" or "crushing X's stones".

Bob Myers: I recommend squash.


See also:


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This is a copy of the living page "Oshitsubushi" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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