EVENT
BOARDSIZE 19
SETUP W C12 K17 M17 K15 Q17 R17 R18 R15 R14 
SETUP B D17 C14 H17 O17 O15 Q18 Q16 Q15 
MARK 2@K15 1@O15
COM
Problem 103. Black to play.  

After Black 1, White reinforces her stones in the center with
2. How should Black continue his operations in the top right
? 
ENDCOM
B 1 R16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should push through and ...
ENDCOM
W 2 S16
B 3 S17
MARK 1@R16
COM
... cut with 1 and 3. However White responds, Black will gain
an advantage.
c<=
ENDCOM
  VAR
  B 3 S15
  COM
  Failure.

  Black suffers a loss if he cuts on the other side with 3. The
  reason will become clear in the next few problems.
  ENDCOM
  W 4 S14
  COM
  White ataris with 4.
  <=
  ENDCOM
  ENDVAR