Compromised diagonals and joseki 1
Difficulty: Dan level
Keywords: Opening, Joseki, Shape, Tactics
![[Diagram]](../../diagrams/7/f275045e203268be8cedc230512fd2b6.png) | Not joseki |
Without a stone at one of the marked points, this is certainly not joseki.
![[Diagram]](../../diagrams/6/700a372b4c145b9939439e385b3e1910.png) | White's shape is better |
If White is free to extend alone the upper side, then the exchange of and is in principle good for White. For one thing, playing at is joseki (3-4 point high approach outside contact).
![[Diagram]](../../diagrams/41/3e46197624eca698274f02af00aeab01.png) | Chinese formation case |
Given a black stone at (or at the marked point), the exchange / is some improvement for Black: it possibly makes White heavier. Black now at a leaves White's stones floating.
![[Diagram]](../../diagrams/12/0aa1a245826046ed879f40cd9288b1ad.png) | Ladder question |
White's other natural resource is at here. There is a ladder question involved. In pro games may only be played when the ladder is good for Black: for example if White invades late and Black has some central influence.
![[Diagram]](../../diagrams/4/4a779c577552fcfb339f010271347634.png) | The ladder in question |
If the ladder with is bad for White, here is possible after .
![[Diagram]](../../diagrams/45/4128caca83127edb0a666ec81b66ff09.png) | A second ladder |
A second ladder (Black at a) can occur if White rejects the chance to live small here after (with at ). This position comes from an Oteai game Yoda Norimoto-Komatsu Hideki (B) 1983-06-29.
Charles Matthews
BobMcGuigan I don't think I'd want to play in the first diagram above without some support to the right or, perhaps in a Chinese Opening type of situation, but I wondered how bad this move could be even if the ladders favor white.
For example, if things went as in the next diagram, it is clearly a bad result for Black since the marked stone is in the wrong place (it should be at a or b).
![[Diagram]](../../diagrams/48/07dba031ea457c2d9190c3b2a8841e76.png) | Bad for Black |
But what about this?
![[Diagram]](../../diagrams/8/4b520e8d80e9e59b4281922e1bbc3471.png) | More or less equal? |
Andre Engels: I assume this is more or less equal, given that - - is a joseki, (although both a and b are clearly more common than ). The joseki is discussed in 3-4 point high approach, double contact, wall
This is a copy of the living page
"Compromised diagonals and joseki 1" at
Sensei's Library.
2003 the Authors, published under the OpenContent License V1.0.
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