(;
GM[1]
SZ[19]
AW[dd][dj][dp][pf][md][nc][oc][qb]
AB[jp][jd][pd][pe][nd][ne][pj][pp]
C[Problem 30. Black to play.  

Black has made a sanren-sei on the right side and occupied both star points in the middle of the upper and lower sides. What is Black's best move in this position ? ]
(;B[me]
TR[jd]

TE[2]
C[Correct Answer.  

Black should push along the fifth line, forcing White in the direction of the marked stone. All of Black's stones are now working together harmoniously. ]
;W[ld]
C[If White 2, ... ]
;B[le]
C[... Black continues to press White with 3. ]
;W[nq]
C[If White next approaches with 4, ... ]
;B[no]
LB[kd:C][mb:B][lb:A]
C[... Black 5 builds a magnificent moyo on the right side . Moreover, Black still threatens White with the sequence Black A - White B - Black C. <= ]
)
(;B[np]
C[Failure.  

If Black plays somewhere else, such as at 1, ... ]
;W[me]
C[... White will seize the initiative at the top with 2 ... ]
;B[og];W[gd]
TR[jd]
C[... and 4. The marked black stone is now under a severe attack. <= ]
)
)