Xuanxuan Qijing Problem 1 / Solution

[Diagram]

Mainline

Why is W8 forced? See the following variations.

[Diagram]

variation 'a'

Next black plays c to get out.

[Diagram]

variation 'b'

If white plays here instead of W8 in the mainline, the sequence in the previous diagram still works.

[Diagram]

White can't block with W2 or W4 in the mainline, otherwise black can just push twice and make double atari to break out.


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