EVENT
BOARDSIZE 19
SETUP W E16 F17 G16 D14 B15 P17 R4 P3 
SETUP B B16 C16 D17 E17 R16 Q15 R10 D4 
COM
Problem 104. Black to play.  

Even though only one stone has been played in the lower left
corner, there is no hurry for Black to play in this part of the
board; the upper right takes precedence. Where should Black play
? 
ENDCOM
B 1 O16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

It is important for Black to inhibit White's expansion in the
upper right with 1 ...
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  VAR
  B 1 R6
  COM
  Failure.

  The checking extension of Black 1 is a big move, but ...
  ENDCOM
  W 2 N16
  COM
  ... White will play 2, making it hard for Black to take measures
  against White at the top.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 L17
  COM
  Black 1 here is greedy:
  ENDCOM
  W 2 P15
  COM
  White would take the initiative by attaching at 2.
  <=
  ENDCOM
  ENDVAR
W 2 N17
B 3 M16
COM
... and 3. With these moves, a black moyo emerges and White is
prevented from making one for herself.
<=
ENDCOM