EVENT
BOARDSIZE 19
SETUP W D16 K16 O17 D4 Q5 R3 O5 Q2 
SETUP B Q16 Q14 Q9 Q3 K4 O4 N5 R2 
MARK 1@O5 2@N5 3@R3 4@R2 5@Q2
COM
Problem 35. Black to play.  

This time Black has played the high Chinese opening. How should
Black counter White's attempt to make sabaki with the sequence
to 5 ? 
ENDCOM
B 1 P3
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Drawing back with 1 is a powerful move here.
ENDCOM
  VAR
  B 1 P2
  COM
  Failure.

  The atari of Black 1 is just what White wants.
  ENDCOM
  W 2 P3
  COM
  White will respond with 2 ...
  ENDCOM
  B 3 Q1
  W 4 O3
  COM
  ... and 4.
  ENDCOM
  B 5 P4
  COM
  If Black next plays 5, ...
  ENDCOM
  W 6 Q4
  MARK \t@O5 \t@N5
  COM
  ... White plays 6. The exchange of the marked stones has now
  become bad for Black.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 R4
  COM
  Failure.

  Playing atari from the other side with Black 1 is also bad.
  ENDCOM
  W 2 P3
  B 3 S3
  W 4 Q4
  B 5 R3
  W 6 P4
  COM
  After the sequence to White 6, Black's moyo has been ripped apart.
  <=
  ENDCOM
  ENDVAR
W 2 S2
B 3 R4
W 4 S3
B 5 Q4
W 6 P2
B 7 O2
W 8 N3
B 9 O3
W 10 S4
B 11 R5
COM
The sequence to Black 11 will follow. Black gets a thick position
in the center, while White gets some territory in the corner.
<=
ENDCOM