(;
GM[1]
SZ[19]
AW[dd][df][dk][cm][cn][dq][dp][do][er][fq][jp][mp]
AB[db][fc][fe][bn][co][cp][cq][cr][dr][po][pq][qk][pd]
LB[fg:B][nc:A][bm:C][mm:D]
C[Problem 145. White to play.  

Black has a lot of profit, while White has thickness in the center. However, Black is also threatening to build a moyo in the center. Where should White play in this position ? ]
(;W[fg]
TE[2]
C[Correct Answer.  

Capping with 1 is the biggest move. ]
;B[nd]
C[If Black defends the upper right with 2, ... ]
;W[lk]
C[... White will stake out a vast moyo and wait for Black to try to invade. <= ]
)
(;W[nc]
C[Failure.  

Against White 1, ... ]
;B[lc]
C[... Black pincers with 2 and ... ]
;W[qc]
C[... White must invade with 3. ]
;B[pc];W[qd];B[pe];W[pb];B[ob];W[qb];B[oc];W[qf]
C[But, after 11, ... ]
;B[fg]
LB[dh:A]
C[... Black jumps to 12, aiming at A, so White must defend. <= ]
)
(;W[bm]
C[Failure.  

White 1 here is big, but gote. <= ]
)
(;W[mm]
C[Failure.  

White 1 is another moyo focal point, but ... ]
;B[fg]
C[... Black 2 leaves White's moyo wide open. <= ]
)
)