EVENT
BOARDSIZE 19
SETUP W D16 C14 C3 B6 C5 D5 E6 D7 E4 E3 H4 Q18 O17 L17 K17 L16 L15 
SETUP B B3 A4 B5 C4 D4 D3 D2 D6 K4 Q5 Q3 Q9 Q14 Q16 R17 K16 J16 K14 
MARK 6@L15 4@L16 2@K17 5@K14 3@J16 1@K16
COM
Problem 155. Black to play.  

Black has reduced White's moyo with the moves 1 to 5. Taking
the overall position into account, how should Black answer White
6 ? 
ENDCOM
B 1 L14
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should block at 1.
ENDCOM
  VAR
  B 1 H13
  COM
  Failure.

  If Black blindly plays the joseki move of 1, ...
  ENDCOM
  W 2 M13
  COM
  ... White jumps out to 2, erasing Black's moyo. Since Black's
  moyo is bigger than White's, the exchange favours White.
  <=
  ENDCOM
  ENDVAR
W 2 K15
COM
If White pushes through with 2 ...
ENDCOM
  VAR
  W 2 R4
  MARK 1@L14
  COM
  The actual game.

  This position was taken from the second game of the 3rd Kisei
  title match, played between Fujisawa Shuko (White) and Ishida
  Yoshio. When Ishida played 1, Fujisawa probed with 2, ...
  ENDCOM
  B 3 Q4
  W 4 L7
  COM
  ... then jumped to 4, thereby avoiding the unfavourable result
  in the Correct Answer.
  <=
  ENDCOM
  ENDVAR
B 3 J14
W 4 J15
COM
... and 4, ...
ENDCOM
B 5 H14
MARK A@C17
COM
... Black builds a huge moyo in the center of the board. Black
is now aiming at the invasion of A.
<=
ENDCOM