EVENT
BOARDSIZE 19
SETUP W C17 D16 D4 P16 
SETUP B F17 C14 Q4 R16 
MARK 6@P16 1@R16 3@Q4 5@F17 7@C14 2@D16 8@C17 4@D4
COM
Problem 81. Black to play.  

Against the double approach of Black 5 and 7, White anchors her
stones in the corner with 8. What should Black do next ? 
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B 1 E15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should confine White to the corner with 1. Never hesitate
to make such confining moves because they will give you a strategic
advantage.
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  VAR
  B 1 Q14
  COM
  Failure.

  Locally, Black 1 is a good move, but ...
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  W 2 E15
  COM
  ... White takes command of the situation when she moves out into
  the center with 2. Black's two stones on the left can no longer
  play a cohesive strategy.
  <=
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  ENDVAR
W 2 E16
MARK A@D15 1@E15
COM
When Black plays 1, he must expect White to cut through with
2 (Note that White could also play 2 from the other side at A.)
...
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B 3 F16
W 4 F15
COM
... and 4.
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B 5 E14
W 6 G15
COM
In answer to White 6, ...
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B 7 J17
MARK B@B16 B@D18
COM
... Black will extend to 7. Black is now strong on the outside
and he can also harass the white stones in the corner by playing
on one of the points marked B.
<=
ENDCOM