EVENT
BOARDSIZE 19
SETUP W C11 E11 F2 F3 E3 G3 D4 C4 E5 B5 C6 M3 M5 S4 R6 R9 Q18 P18 O18 O17 P15 Q15 R16 
SETUP B E17 D16 C13 E13 B4 B3 C3 D3 D2 E2 E4 O3 Q4 R3 S3 R11 N18 N17 N16 J17 O16 P16 P17 O15 
COM
Problem 118. White to play.  

How should White attack the lone black stone on the right side
? 
ENDCOM
W 1 P10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

The knight's move of White 1, driving Black into her strong position
above, is a good move.
ENDCOM
  VAR
  W 1 P11
  COM
  Failure.

  White 1 is overly aggressive.
  ENDCOM
  B 2 Q10
  W 3 O9
  B 4 P10
  W 5 O10
  B 6 Q8
  W 7 R8
  B 8 P8
  COM
  Black runs away towards his stones at the bottom with the sequence
  to 8, but ...
  ENDCOM
  W 9 P6
  COM
  ... White keeps him on the run with 9. Next ...
  ENDCOM
  B 10 O8
  W 11 M9
  B 12 N7
  W 13 O5
  B 14 L7
  COM
  Up to 14, Black breaks into White's moyo.
  ENDCOM
  W 15 K9
  COM
  This is extremely risky for White; she now has to kill Black
  to win. But this is not so easy because Black has a lot to room
  to maneuver.
  <=
  ENDCOM
  ENDVAR
B 2 P11
W 3 O11
B 4 P12
W 5 O12
B 6 R13
W 7 O13
COM
After White 7, ...
ENDCOM
B 8 S10
W 9 S9
B 10 S14
W 11 S15
B 12 S12
COM
... Black makes a living group with the sequence to 12, but ...
ENDCOM
W 13 G12
COM
... White's moyo is enormous after she plays 13.
<=
ENDCOM