EVENT
BOARDSIZE 19
SETUP W F17 R6 R10 P17 O17 N17 N16 N15 M15 
SETUP B D16 D4 C6 D10 Q4 O3 Q16 Q17 O16 O15 Q14 N14 L16 M18 
MARK \t@M15
COM
Problem 136. White to play.  

In Variation 1 of Problem 30, White extended with the marked
stone. How should Black continue at the top ? 
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B 1 G16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

The shoulder hit of Black 1, a leaning attack, is a move that
would not occur to many players, but, in this position, it is
quite severe.
<=
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W 2 E15
COM
White tries to break out into the center with 2 ...
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  VAR
  W 2 F16
  COM
  If White pushes with 2 ...
  ENDCOM
  B 3 F15
  W 4 E15
  COM
  ... and 4, ...
  ENDCOM
  B 5 F14
  COM
  ... Black extends to 5.
  ENDCOM
  W 6 E16
  COM
  After White connects with 6, 
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  B 7 L13
  COM
  ... Black attacks the stones on the right with 7.
  ENDCOM
  W 8 L15
  B 9 K16
  W 10 K15
  B 11 J16
  W 12 K13
  B 13 K12
  W 14 J13
  B 15 J15
  W 16 J14
  B 17 L12
  W 18 J12
  COM
  White manages to get out into the center with the sequence to
  18, but ...
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  B 19 D17
  COM
  ... Black switches back to the left and ...
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  W 20 D15
  B 21 B15
  W 22 B14
  B 23 B16
  W 24 D13
  B 25 F12
  COM
  ... traps the white stones with the sequence to 25. White is
  unable to live.
  <=
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  ENDVAR
B 3 D15
W 4 G15
COM
... and 4, but ...
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B 5 H15
W 6 G14
B 7 H14
MARK 5@H15
COM
... Black plays 5 and 7. These last two moves attack the six
white stones in the right, so ...
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W 8 M14
COM
... White must get into the center with 8.
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B 9 G17
COM
Black now takes the initiative on the left with 9 ...
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W 10 F16
B 11 G13
COM
... and 11. The white stones there are now in trouble.
<=
ENDCOM