EVENT
BOARDSIZE 19
SETUP W C14 H15 H17 O17 Q17 R18 
SETUP B D16 F16 F14 L17 R17 Q16 Q14 R10 
MARK 1@R18
COM
Problem 44. Black to play.  

How should Black answer White 1 ? 
ENDCOM
B 1 P17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black must not passively play as in Problem 41. Instead he should
take the initiative by playing 1.
ENDCOM
W 2 Q18
B 3 P16
COM
If Black wants thickness, he can play the joseki from 3 to ...
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  VAR
  B 3 P18
  COM
  Variation.

  If Black wants profit in the corner, he will block at 3.
  ENDCOM
  W 4 P16
  B 5 O18
  W 6 O16
  B 7 N18
  W 8 Q15
  B 9 R16
  W 10 R15
  B 11 S15
  W 12 R14
  B 13 S14
  W 14 R13
  B 15 S18
  COM
  The moves to 15 are also joseki. Black can make a deep invasion
  if  he knows these josekis.
  <=
  ENDCOM
  ENDVAR
W 4 P18
B 5 O16
W 6 N17
B 7 M15
COM
7.
<=
ENDCOM