(;
GM[1]
SZ[19]
AW[db][dc][dd][cg][ch][ci][df][ef][ee][fd][hc][dq][do]
AB[cc][cd][de][ce][cf][bg][bh][ed][ec][eb][fb][pd][pq]
LB[jp:C][pk:A][po:B]
C[Problem 125. Black to play.  

In the upper left corner, Black got profit while White made thickness. What is the best way for Black to counter this thickness ? ]
(;B[jp]
TE[2]
C[Correct Answer.  

Black 1 reduces the power of White's thickness. ]
;W[po]
C[If White approaches with 2, ... ]
;B[qo];W[qn];B[qp];W[pn];B[np]
C[... Black plays the joseki to 7, taking profit in the lower right. ]
;W[pj];B[ph]
C[After 9, Black is ahead in territory. <= ]
)
(;B[pk]
C[Failure.  

Black makes the Chinese-opening formation with 1, but ... ]
;W[jp]
C[... White gets a chance to take the vital point of 2. ]
;B[lp]
C[If Black now plays 3, ... ]
;W[kn]
C[... White plays 4 and a huge moyo emerges in the center. <= ]
)
)