EVENT
BOARDSIZE 19
SETUP W D16 R14 R11 S6 R4 R3 P2 D2 E2 E3 F2 B7 C7 D6 C5 D4 B4 C4 E7 
SETUP B R16 P17 Q8 Q4 Q5 N4 B3 C3 D3 F3 G3 E4 E5 E6 D7 D8 D9 C8 B8 
MARK \t@R14
COM
Problem 103. Black to play.  

White has just made the checking extension with the marked stone.
What should Black do ? 
ENDCOM
B 1 Q10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should make a shoulder hit with 1 and build a moyo in the
center.
ENDCOM
  VAR
  B 1 P11
  COM
  Failure.

  Capping with Black 1 is thin.
  ENDCOM
  W 2 P14
  MARK A@P10
  COM
  After 2, White can aim at the attachment of A.
  <=
  ENDCOM
  ENDVAR
W 2 Q11
COM
 If White pushes up with 2, ...
ENDCOM
  VAR
  W 2 P12
  COM
  If White plays the knight's move of 2, ...
  ENDCOM
  B 3 O11
  W 4 O12
  B 5 N11
  W 6 N12
  B 7 M11
  COM
  ... Black maps out a moyo with the sequence to 7.
  ENDCOM
  W 8 E12
  COM
  In the game from which this problem was taken, White plays 8
  to cut down on the scale of this moyo.
  <=
  ENDCOM
  ENDVAR
B 3 P11
COM
... Black plays a two-step hane with 3 ...
ENDCOM
W 4 P12
B 5 O12
COM
... and 5.
ENDCOM
W 6 P10
COM
If White ataris with 6, ...
ENDCOM
B 7 O11
COM
... Black connects with 7 and ...
ENDCOM
W 8 Q9
B 9 P9
W 10 R10
B 11 O10
COM
... the sequence continues up to 11. Black has mapped out a huge
moyo in the center.
<=
ENDCOM