EVENT
BOARDSIZE 19
SETUP W D16 C14 R17 R16 R14 S14 D4 D6 K3 
SETUP B F17 K16 Q17 Q16 Q15 P13 R12 F3 N3 Q4 
MARK \t@N3
COM
Problem 128. White to play.  

Black has just played the marked stone. What should White do
? 

[You will find a supplement to this Problem Diagram as "Problem 148"]
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W 1 E3
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should attach with 1 and ...
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  VAR
  W 1 F6
  COM
  Failure.

  White 1 is the wrong direction.
  ENDCOM
  B 2 J4
  COM
  Black plays the shoulder hit of 2 and ...
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  W 3 K4
  B 4 J5
  W 5 K5
  B 6 J6
  W 7 L7
  B 8 J8
  MARK \t@N3
  COM
  ... escapes into the center up to 8. Because of the marked stone,
  White's stones are a bit cramped.
  <=
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  ENDVAR
  VAR
  W 1 H3
  COM
  Failure.

  White 1 is inefficient.
  ENDCOM
  B 2 C3
  COM
  Black invades the corner with 2 and ...
  ENDCOM
  W 3 D3
  B 4 D2
  W 5 E2
  B 6 C2
  W 7 E3
  B 8 B5
  MARK A@K5 1@H3
  COM
  ... lives with the sequence to 8. White's stones are overconcentrated.
  The stone at 1 would be better placed at A.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 D3
  COM
  Failure.

  Defending the corner with 1 loses a tempo.
  ENDCOM
  B 2 J4
  COM
  Black attacks with the shoulder hit of 2.
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  W 3 K4
  B 4 J5
  W 5 J3
  B 6 G4
  W 7 M4
  B 8 L6
  W 9 N4
  B 10 O3
  COM
  The sequence to Black 10 leaves the white stones heavy.
  <=
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  ENDVAR
B 2 F4
COM
... Black will respond with 2.
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W 3 K5
COM
White now jumps out into the open with 3 ...
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B 4 G7
W 5 K7
COM
... and 5. Although White's stones don't have eye shape, neither
do Black's.
<=
ENDCOM