EVENT
BOARDSIZE 19
SETUP W D3 C5 M5 N8 P8 P7 Q8 P6 P5 R5 S5 O15 N16 P16 R17 
SETUP B D16 Q3 R4 O4 O5 N6 M6 Q7 R7 R8 Q9 S17 R16 Q15 P15 
COM
Problem 127. White to play.  

The white stones in the lower right don't have eyes. What should
White do ? 
ENDCOM
W 1 P11
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should attack with 1.
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  VAR
  W 1 Q11
  COM
  Failure.

  White 1 looks like a tesuji. Players who have studied this move
  in joseki books would be tempted to play it. But ...
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  B 2 P10
  MARK 1@Q11
  COM
  ... Black will answer White 1 with the diagonal move of 2.
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    VAR
    B 2 P9
    COM
    If Black follows the usual sequence of 2 ...
    ENDCOM
    W 3 O9
    B 4 P10
    COM
    ... and 4, his stones are in trouble ...
    ENDCOM
    W 5 O12
    B 6 R10
    W 7 R11
    MARK A@S9 5@O12
    COM
    ... after White 5 and 7. Next, White A is a deadly move.
    <=
    ENDCOM
    ENDVAR
  W 3 P11
  COM
  If White plays the normal moves of 3 ...
  ENDCOM
    VAR
    W 3 M10
    COM
    If White 3 here, ...
    ENDCOM
    B 4 P11
    MARK 1@Q11
    COM
    ... Black quells the white stone at 1 by playing at 4.
    <=
    ENDCOM
    ENDVAR
  B 4 O10
  W 5 N12
  COM
  ... and 5, ...
  ENDCOM
  B 6 M10
  COM
  ... her eight stones below are in serious trouble.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 O10
  COM
  Failure.

  White 1 is crude.
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  B 2 Q11
  COM
  It just provokes Black to defend his territory on the fourth
  line with 2.
  <=
  ENDCOM
  ENDVAR
B 2 R11
COM
Black is forced to submissively defend on the third line with
2. 
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W 3 O10
MARK A@R12
COM
Next, White 3 threatens to attach at A, ...
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B 4 Q12
COM
... so Black defends with 4.
ENDCOM
W 5 O13
COM
White can now build influence throughout the center with 5.
<=
ENDCOM