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Kosumitsuke Joseki
Path: DiagonalAttachmentPath · Prev: DiagonalAttachmentAsInferiorShape · Next: 44PointLowApproachDiagonalContactThenPincer
Difficulty: Beginner
Keywords: Joseki, Question
There is a well-known pattern, occurring often in handicap games, which starts with a kosumi tsuke.
There are several things worth noting:
Let's have a closer look at the implications, with diagrams
Here, the marked handicap stone in the previous diagram is absent. In this case
The follow-up at a is not at all compulsory, either in amateur handicap or in even pro games. White will often tenuki and leave her options open, including b to d. A pincer to the right of the marked stone can also be expected.
What happens if Black doesn't even grant White her shortest extension?
From pro play, where
If
This is also seen, but there is a ladder issue. White denies the good empty triangle but ends up with a mediocre shape anyway. Examples and counterexamples from pro playDaveSigaty: Generally bad, hmmm... Rare I will grant you. But from time to time the duffers dust off this old chestnut! :-)
Go Seigen - Hashimoto Utaro (Black) Ten Game Match in 1947
Awaji Shuzo - Cho Chikun (Black) 3rd Kisei Preliminaries 1978-07-06
Yi Ch'ang-ho - Yoda Norimoto (Black) 10th TV Asia Championship 1998-08-12
Yu Ch'ang-hyeok - Ma Xiaochun (Black) 1st Toyota & Denso Cup 2002-03-19
Shao Zhenzhong (B) against Cao Dayuan, Chinese team tournament, March 28, 1990.
It seems that professionals do in rare cases play this (pseudo-)joseki, typically when the player playing it is strong on the side. The idea is undoubtedly that a short extension (to a) is overconcentrated, but a longer extension like here leaves black open to an invasion and thus an attack. Prerequisite is that black is strong enough that this invasion must be considered important aji. - Andre Engels
Authors March 2003: rewritten and rereferenced, rather than WME. A.o. material now to be found at BQM82. Dieter
[1] Bill: I'm surprised that the full pattern occurs that often in pro play. In a handicap game, how often will White play
Charles When Black attacks with
What about cutting immediately after the attachment? Guo Juan showed me this variation.
The white move 10 should be at A for good shape, but then black gets B.
White lives in the corner, and next black plays around a to live on the side. In the game it was possible to exchange b for c before a.
In the Guo Juan -diagram a more severe pincer was possible, so the cut might work better than for Sakata (he eventually lost the game).
This position has occurred in some pro games. The most common idea is this
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