Xuanxuan Qijing Problem 1 / Solution
![[Diagram]](../../diagrams/9/54176c6bf24bbd3d5c64de89572a56db.png)
Mainline
Why is
forced? See the following variations.
![[Diagram]](../../diagrams/11/80ecc68a3730d2d4117f3f0637963a47.png)
variation 'a'
Next black plays c to get out.
![[Diagram]](../../diagrams/19/a6932711d30c7466fc9c1d076572e6e9.png)
variation 'b'
If white plays here instead of
in the mainline, the sequence in the previous diagram still works.
White can't block with
or
in the mainline, otherwise black can just push twice and make double atari to break out.