cross-cut, diagonal away

  Difficulty: Advanced   Keywords: Shape
[Diagram]

Not 'correct' shape



After a cross-cut in the centre of the board, W1 isn't a recognised good shape. One can give some reasons.



Supposing Black simply answers with black+circle. Then this is similar to the position in diagonal play reference positions?: White is at some disadvantage for influence. You could also say that black+circle threatens a good play at a.

[Diagram]

Different order



With this order of moves W3 may also appear a little unreasonable.

[Diagram]

'Wrong' way to cut



The same position arises here, though with Black to play. The 'correct' way to cut here is with W1 at B2 (strike at the waist of the knight's move).

Tapir: I disagree. 1 and 2 are both the "waist" of the keima - afaik. However, if 1 at 2, 2 at 1, 3 cuts at the point left to 1, than 4 can capture the cutting stone in a ladder. It may be bad shape, but here without any other stones, it is not the wrong cut, but the only one.


For all these reasons this is a relatively rare shape.

An example can be see at Attach-crosscut corner patterns, in the 4-4 point case.

Another is in this difficult joseki:

[Diagram]

Joseki

This was played by Shinohara Masami against Go Seigen in 1935; it is hard to know how current B4 is.

Charles Matthews


This is a copy of the living page "cross-cut, diagonal away" at Sensei's Library.
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