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