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CompromisedDiagonal

 

Compromised diagonals and joseki
  Difficulty: Dan level   Keywords: Joseki, Shape

There are a number of opening plays that are not recognised joseki, that make the compromised diagonal shape. When these are used in games by pros, there are some reasons.

[Diagram]
Not joseki

This play has uses in the Chinese opening with a black stone at one of the marked points.



  • Compromised diagonals and joseki 2?

[Diagram]
Accepted as joseki

This play has become a standard one in the Chinese opening. Black does not actually attack the white stone, but tries to avoid helping it make shape in any way. After this, the white stone is light.


[Diagram]
making shape

Because WC is light, white will often either playing tenuki or jump away lightly, but if white does want to make shape here (immediately or later), this is one standard variation. The choice between B3 here or at a, as well as the position of W6, of course depend on the exact position of the marked black stone.



  • Compromised diagonals and joseki 3?

[Diagram]
Almost joseki

A variant in the 3-4 point high approach two-space high pincer.

W1 is, although rarely, played by professionals. Usually there will be a stone like BC on the left side while the top right corner is black too. It is thus used defensively, intending to make a living group and avoid getting into a fight.



  • Compromised diagonals and joseki 4?

[Diagram]
Joseki?

If Black here comes out with B1 after the unusual pincer WC, what happens?


[Diagram]
Joseki? (black 11 at a, white 12 at b, black 13 at c)

WC is played too rarely to recognise anything as joseki (except for B1 itself), but the sequence here seems to be one of the candidates, being the only one I saw more or less replicated (although in a game with a black stone at the marked point, so a was not played, while b was not answered).

  • Compromised diagonals and joseki 5?

[Diagram]
3-3 point

W1 is only played if white is very strong in this area; positions where BC feels more like an invasion than a kakari. After B2, white will usually play a squeeze play on the top to attack black. Black can run away, or sacrifice BC and B2 to get a position on the left.

  • Compromised diagonals and joseki 6?

[Diagram]
Known in the Chinese

Charles This is also known as a way for Black to play, with the Chinese enclosure.



Charles Matthews, Andre Engels



This is a copy of the living page "Compromised diagonals and joseki" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.