Beginner Exercise 195 / Solution

Sub-page of BeginnerExercise195
[Diagram]

The vital point

After W1, a and b are miai to kill (?) (If B2 at one, W3 at the other.) [1]

[Diagram]

Remove outside liberties

If B4 and B6 go at two of the circled points, then W5 and W7 at the squared points. B8 at the remaining circled point captures, but...

[Diagram]

The vital point (again)

W1 here kills the black group.

Notice that W1 in the first diagram at a or b allows B2 at W1 there, which costs white an additional move in connecting and black can either retake the vital point (making eyes) or push outwards through the remaining outside liberty. [2]


[1]

[Diagram]

Seki

unkx80: After B2 and W3, Black will tenuki. Isn't this a seki?

JoelR: Indeed. White can't threaten to kill without making a capturable live shape. On the other hand,

[Diagram]

Better

This W1 takes away Black's option, and now even if Black makes no more plays, White can play at the squares for atari, with a bulky five dead shape inside.


[2]

[Diagram]

Black throws in

JoelR: The throw-in doesn't help Black---after closing off the outside, White can play at the square to make atari and a dead shape. If Black tries to push out with 'a', then 'b' keeps him in.

unkx80: Yes, this is what I am looking for. =)


[Diagram]

Another way?

mgelo Doesn't this W1 work too?

[Diagram]

Black makes a seki.

fractic: Black answers with B2 and the result is a seki again.



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