EVENT
BOARDSIZE 19
SETUP W D16 D4 D6 Q5 P9 O17 K16 
SETUP B F3 K4 Q3 O4 R9 Q16 Q14 
MARK 1@Q5 2@O4 3@P9
COM
Problem 74. Black to play.  

After 2, White strikes at the weak point of the low Chinese opening
by capping at 3. How should Black prevent White from making sabaki
? 
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B 1 R7
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is a sharp move. White has to keep her stones linked,
...
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  VAR
  B 1 Q11
  COM
  Failure.

  The proverb advises us to answer a cap with a knight's move,
  but if Black plays 1, ...
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  W 2 R8
  B 3 S8
  W 4 S9
  B 5 S10
  W 6 Q9
  B 7 R10
  W 8 S7
  COM
  ... White makes sabaki within Black's moyo, ...
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  B 9 T9
  COM
  ... ending in sente.
  <=
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  ENDVAR
W 2 Q8
COM
... so she plays 2 ...
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  VAR
  W 2 P6
  MARK @@Q8
  COM
  Failure for White.

  The forcing move at @ in the Correct Answer is necessary. If
  White simply plays 2 here, ...
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  B 3 P7
  COM
  ... Black will play 3 and, ...
  ENDCOM
  W 4 O7
  B 5 O8
  W 6 P8
  B 7 Q7
  W 8 N7
  COM
  ... after 8, ...
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  B 9 O9
  COM
  ... Black can fight with 9.
  <=
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  ENDVAR
B 3 R8
W 4 Q7
COM
... and 4.
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B 5 Q11
COM
When Black now plays 5, White's stones are rootless, floating
in the center, so Black will be able to gain more profit by attacking
them.
<=
ENDCOM