Gokyo Shumyo, Section 1, Problem 18 / Solution

[Diagram]

Main line

B1 comes in handy when B7 gives atari and threatens to make two eyes. If White connects at B3, Black captures at a and has an eye in the corner and one where he captured four stones.


[Diagram]

Variation 1

W2 takes a vital point, and W4 and W6 reduce the eyespace but still a and b are miai for life.


[Diagram]

Wrong B1 (seki)

B1 creates a long L group, leading to seki. Life with points as in the correct diagram is better than seki.

[Diagram]

Wrong B1 (White mistake)

If White resists at W6, B7 is a tesuji. B9 recaptures at B7 and if White connects underneath at a, Black can give atari at b.

[Diagram]

Wrong B1 and B5 (ten thousand year ko)

Here Black misses the tesuji and ends up with a ten thousand year ko.


[Diagram]

Wrong 2

B1 is badly placed for catching the clamp stone W2.


[Diagram]

Addendum

If the marked stone is present B1 doesn't work anymore. W8 is double atari.

[Diagram]

Addendum

In this case it is better to create a long L group with 1. The marked stone now alters the status from seki to ten thousand year ko. See Long L Group for details.


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