EVENT
BOARDSIZE 19
SETUP W D16 D4 K4 R11 R14 Q14 
SETUP B Q9 Q4 R15 Q16 O16 K16 
MARK 1@R11 \t@Q9
COM
Problem 79. Black to play.  

After White plays 1, the marked stone seems to be a bit thin.
How should Black continue ? 
ENDCOM
B 1 S10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should play 1, a move which attacks White and strengthens
his position on the lower right.
<=
ENDCOM
  VAR
  B 1 Q6
  COM
  Failure.

  Making a corner enclosure with 1 is bad.
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  W 2 S9
  COM
  White slides to 2, settling her stones while eating into Black's
  territory on the lower right side.
  <=
  ENDCOM
  ENDVAR