EVENT
BOARDSIZE 19
SETUP W R17 D16 D14 D10 D4 H3 H5 K5 R3 R4 S3 T4 S5 Q6 R6 S6 S7 T6 O7 
SETUP B Q16 Q14 K16 F17 K3 M4 Q3 Q4 Q5 R5 P6 P7 P8 Q7 R7 S8 R8 
MARK \t@R17
COM
Problem 92. Black to play.  

White has invaded the corner with the marked stone. How should
Black respond ? 
ENDCOM
B 1 Q17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is the correct direction.
ENDCOM
  VAR
  B 1 R16
  COM
  Failure.

  Black 1 is in the wrong direction.
  ENDCOM
  W 2 Q17
  B 3 P17
  W 4 P18
  B 5 O17
  W 6 O18
  B 7 N17
  W 8 S16
  B 9 S15
  W 10 S17
  MARK B@T15 A@R14
  COM
  White gets more territory in the corner than she should and Black's
  moyo at the top is not as large. Moreover, the marked stone
  is misplaced: it would be better positioned at A. White now has
  a good endgame move at B.
  <=
  ENDCOM
  ENDVAR
W 2 S16
COM
When White plays 2, ...
ENDCOM
B 3 S14
COM
... Black can jump down to 3 and White is completely confined
to the corner.
ENDCOM
W 4 Q18
B 5 P18
W 6 R18
B 7 O17
COM
After Black defends at 7, he has a vast moyo in the upper right
sector.
<=
ENDCOM