EVENT
BOARDSIZE 19
SETUP W D16 D14 D10 C4 E3 S4 S3 R3 Q3 O3 N3 R6 M17 M15 P18 Q18 S18 R19 
SETUP B K4 N4 P4 O4 Q4 R4 R5 S5 Q10 F17 K17 K16 R18 R17 Q17 S17 Q16 Q14 
MARK \t@M15 \t@M17 \t@P18 \t@Q18 \t@R19 \t@S18
COM
Problem 38. Black to play.  

White's marked stones in the top right are without eyes. How
should Black attack them ? 
ENDCOM
B 1 N13
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should attack with 1 ...
ENDCOM
  VAR
  B 1 K14
  COM
  Failure.

  Black 1 ...
  ENDCOM
  W 2 M13
  B 3 K12
  COM
  ... and 3 drive White in the wrong direction. Black's thickness
  at the bottom is now neutralised and the space here is so big
  that White will have no trouble living.
  <=
  ENDCOM
  ENDVAR
W 2 L14
B 3 L12
COM
... and 3, thereby mapping out an enormous moyo below.
<=
ENDCOM