Xuanxuan Qijing Problem 1 / Solution

[Diagram]

Mainline

Why is B8 forced? See the following variations.

[Diagram]

variation 'a'

Next white plays c to get out.

[Diagram]

variation 'b'

If black plays here instead of B8 in the mainline, the sequence in the previous diagram still works.

[Diagram]

Black can't block with B2 or B4 in the mainline, otherwise white can just push twice and make double atari to break out.


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