EVENT
BOARDSIZE 19
SETUP W D17 G17 D12 Q4 
SETUP B F15 C15 D4 Q16 
MARK 1@C15 2@D12 3@F15 4@G17
COM
Problem 53. Black to play.  

Black has played the two corner star points on diagonally opposite
sides of the board. After the sequence from Black 1 to White
4, how should Black continue ? 
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B 1 D9
MARK A@H16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should either make a pincer around 1 or press White at
A.
<=
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  VAR
  B 1 D10
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  A severe one-space against the white stone is also frequently
  played in professional games.
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  W 2 F12
  COM
  After White 2, ...
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  B 3 H15
  COM
  ... Black forces with 3, ...
  ENDCOM
  W 4 K16
  B 5 H12
  COM
  ... then caps at 5.
  ENDCOM
  W 6 E10
  B 7 D9
  W 8 D11
  B 9 E9
  W 10 F10
  B 11 G8
  COM
  The sequence to Black 11 is one possible continuation.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 H16
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Also correct.
  <=
  ENDCOM
  ENDVAR