4-5 point 4-3 approach outside contact
Difficulty: Intermediate
Keywords: Joseki
![[Diagram]](../../diagrams/9/0005eeb7a547e4e7082087df271421bf.png) | Outside contact |
is not so often seen now in pro play, because it relies in one major variation on a ladder. Nowadays, joseki involving ladders may be experiencing a decrease in popularity. See ladder strategy discussion.
Deviations from the sequence up to are very rare.[1] Tenuki with is also very rare: see 4-5 point 4-3 approach outside contact, tenuki.
After , it is expected Black will cut at a or b. White will capture the cutting stone and Black takes either territory or influence. at b also.
![[Diagram]](../../diagrams/12/126d3da67eb79b8fcdebea4e4b3ca792.png) | Variation |
On a few occasions in pro games, is played. This continuation is typical: White's position is low, and Black has influence on the left side. By playing this way White does limit Black's choice.
![[Diagram]](../../diagrams/46/c590354aae2830aee7d176463c93e901.png) | Outside contact main line |
This is by far the most common variation, with Black taking the corner. Since does retain some aji, follow-up plays here require careful thought.
![[Diagram]](../../diagrams/30/8b7cccb640a15ed120c45eaa2b3d06d8.png) | Variation - potential ko |
On the other hand Black can still play for influence here, with instead of the cut at a (previous diagram). After it looks like a ko: this is unlikely to be fought out (though it was in a game Rui Naiwei-Pak Chi-eun(B) 2001-02-12).
![[Diagram]](../../diagrams/18/a1b21f776b2ebffe7c1868ddb6e076c0.png) | Continuation |
Assume , elsewhere as ko threat and reply, and recaptures at . Then is acceptable to Black in most cases: seems required locally, and this exchange gains Black influence.
![[Diagram]](../../diagrams/28/5c213f7585ce14a765f858f45ff35b73.png) | Outside contact ladder line |
and to capture in a ladder aren't seen so much, now. After that Black's ladder capture at b, and attempt to force White at a, are important follow-up plays.
See further discussion at Capture the cutting stones in joseki 1.
[1] at is known (Hashimoto Utaro) but in a context where related to a ladder question. at the square-marked point, playing into bad shape (see six kyu noseki) has been played by Sakata. at is known in a game of Go Seigen, and as played by Cho Tae-hyeon.
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"4-5 point 4-3 approach outside contact" at
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