Xuanxuan Qijing Problem 1 / Solution

[Diagram]

Main line

Why would black choose B8 here? See the following variations.

[Diagram]

variation 'a'

If black plays this B1 instead of B8 in the previous diagram, white replies with W2 through W8. Next white plays c to get out.

[Diagram]

variation 'b'

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

[Diagram]

Black can't block with B2 in the main line, otherwise white can just push twice and make double atari to break out. If black blocks with B4 in the main line, white can break out in a similar way.


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