Gokyo Shumyo, Section 1, Problem 87 / Solution

variations: unkx80 and Dieter

Solution

[Diagram]

Main line

After B9, White can't play at a because of the snapback.

[Diagram]

Continuation

So Black captures and can connect at B3 if White ataris at W2.

[Diagram]

Variation 1

If White connects at W6, B7 and B9 captures the three stones including W8 (White a, Black b).

[Diagram]

Variation 2

White can not play this way because the marked black stone assures the second eye at the circled point.


Failures

[Diagram]

Failure at 7

The order of play is important here. If Black tries to get a stone at B7 first, then gives atari, White's shortage of liberties has vanished. She plays W10 to make miai of cutting at a or saving the cutting stones at b.

[Diagram]

Failure at 7 (ii)

Here, White simply connects and has one liberty more than the 4 stones in atari.


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