(;
GM[1]
SZ[19]
AW[ec][eb][dc][dd][fd][de][ck][qq][pq][nq][nr][pb][nc][ld][kd][ke][dq]
AB[cb][db][cc][cd][fc][cf][lq][mo][pp][op][qp][pj][pd][pf][jf][kf][le][me]
LB[jf:7][kd:6][kf:5][ke:4][le:3][ld:2][me:1]
C[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 ? ]
(;W[kk]
LB[pn:C][mp:B][ko:A]
TR[ki][ll][mo][jf]

TE[2]
C[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. ]
(;B[mk]
C[Takemiya was concerned about an invasion. If he played 2, ... ]
;W[qh]
C[... the invasion at 3 would be very disconcerting. <= ]
)
(;B[ik]
C[If Black played a capping move with 2, however, ... ]
;W[km]
C[... White would jump to 3. Black has no follow-up, so the game would be easy for White. <= ]
)
(;B[do]
C[How the game continued.  

Black switched from the center to the lower left with 2 and ... ]
;W[fp];B[dl];W[cl];B[dm];W[ej];B[cq];W[cr];B[cp];W[er];B[cm]
C[... played the moves to 12. ]
;W[ch]
C[After exchanging 13 ... ]
;B[cg]
C[... for 14, ... ]
;W[nj]
C[... White came back to the right and played 15. It is hard to say which side has the advantage. <= ]
))
(;W[lk]
TR[ll][ki]
C[Failure.  

A deep invasion with White 1 cannot be dismissed, but ... ]
;B[jk]
C[... 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. <= ]
)
(;W[jk]
TR[ll][ki]
C[Failure.  

White 1 is not a good erasing move. ]
;B[lk]
LB[qj:B][qh:A]
C[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. <= ]
)
(;W[kj]
TR[ll][ki]
C[Failure.  

White 1 is too near the thick black wall above, so it cannot be very good. ]
;B[do]
C[For the time being, Black would play at 2, just as in the actual game. <= ]
)
(;W[do]
C[Failure.  

White 1 ... ]
;B[jk]
TR[ll][ki]
C[... 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. = ]
)
)