EVENT
BOARDSIZE 19
SETUP W E17 E18 D17 D16 F16 D15 C9 R3 Q3 O3 O2 Q18 O17 M16 L16 L15 D3 
SETUP B C18 D18 C17 C16 F17 C14 M3 N5 Q4 P4 R4 Q10 Q16 Q14 K14 L14 M15 N15 
MARK 7@K14 6@L16 5@L14 4@L15 3@M15 2@M16 1@N15
COM
Problem 168. White to play.  

This position is taken from a game played between Takemiya (Black)
and Otake. Takemiya likes to map out big moyos and that is what
he has done here. Where do you think Otake should play ? 
ENDCOM
W 1 L9
MARK \t@L11 \t@M8 \t@N5 \t@K14 C@Q6 B@N4 A@L5
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

We have marked another line for your convenience. If you were
Otake, would you have entered into the black moyo as far as White
1 ?

Black has a lot of weak point at A, B, and C, so you want to
play within striking distance of these points. This is why Otake
decided to play at 1.
ENDCOM
  VAR
  W 1 M9
  MARK \t@M8 \t@L11
  COM
  Failure.

  A deep invasion with White 1 cannot be dismissed, but ...
  ENDCOM
  B 2 K9
  COM
  ... the cap of Black 2 could be troublesome. White's stone would
  probably live, but with Black's thickness above it, it would
  be hard for White to gain any advantage.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 K9
  MARK \t@M8 \t@L11
  COM
  Failure.

  White 1 is not a good erasing move.
  ENDCOM
  B 2 M9
  MARK B@R10 A@R12
  COM
  Black would answer with 2. There may still be an invasion at
  A, but Black would defend at B and get a lot of territory below.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 L10
  MARK \t@M8 \t@L11
  COM
  Failure.

  White 1 is too near the thick black wall above, so it cannot
  be very good.
  ENDCOM
  B 2 D5
  COM
  For the time being, Black would play at 2, just as in the actual
  game.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 D5
  COM
  Failure.

  White 1 ...
  ENDCOM
  B 2 K9
  MARK \t@M8 \t@L11
  COM
  ... lets Black perfect his moyo with 2. White will make some
  intrusion into it, but Black can expect a large territory around
  here when the game is over.
  =
  ENDCOM
  ENDVAR
B 2 N9
COM
Takemiya was concerned about an invasion. If he played 2, ...
ENDCOM
  VAR
  B 2 J9
  COM
  If Black played a capping move with 2, however, ...
  ENDCOM
  W 3 L7
  COM
  ... White would jump to 3. Black has no follow-up, so the game
  would be easy for White.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 2 D5
  COM
  How the game continued.

  Black switched from the center to the lower left with 2 and ...
  ENDCOM
  W 3 F4
  B 4 D8
  W 5 C8
  B 6 D7
  W 7 E10
  B 8 C3
  W 9 C2
  B 10 C4
  W 11 E2
  B 12 C7
  COM
  ... played the moves to 12.
  ENDCOM
  W 13 C12
  COM
  After exchanging 13 ...
  ENDCOM
  B 14 C13
  COM
  ... for 14, ...
  ENDCOM
  W 15 O10
  COM
  ... White came back to the right and played 15. It is hard to
  say which side has the advantage.
  <=
  ENDCOM
  ENDVAR
W 3 R12
COM
... the invasion at 3 would be very disconcerting.
<=
ENDCOM