Xuanxuan Qijing Problem 1 / Solution
![[Diagram]](../../diagrams/33/0bdfde21197333848cd901f5678055aa.png)
Main line
Why would black choose
here? See the following variations.
![[Diagram]](../../diagrams/33/25e71246239e274c9d97b11cee928acc.png)
variation 'a'
If black plays this
instead of
in the previous diagram, white replies with
through
. Next white plays c to get out.
![[Diagram]](../../diagrams/9/01732779acb01bbd13f67eba9087dc16.png)
variation 'b'
If black plays here instead of
in the main line, the sequence in the previous diagram still works.
Black can't block with
in the main line, otherwise white can just push twice and make double atari to break out. If black blocks with
in the main line, white can break out in a similar way.