(;
GM[1]
SZ[19]
AW[dd][dp][qf][od][nc][oc][pc][qc][ne][nf][ng]
AB[jp][pp][pj][pg][qg][pe][oe][pd][qd][nd][md][le]
C[Problem 152. White to play.  

Both White and Black have weak stones in the center. How should White continue ? ]
(;W[lg]
TE[2]
C[Correct Answer.  

White should force once with 1, ... ]
(;B[je];W[mj]
C[... then jump to 3, reducing the potential of Black's moyo at the bottom. White's stones are now in no danger. <= ]
)
(;B[mc]
C[Black could also play 2 here, but White's stones in the corner are safe, so she could just ignore it. <= ]
))
(;W[dj]
C[Failure.  

White must defend her stones on the right. If she makes a sanren-sei on the left with 1, ... ]
;B[lg]
C[... Black will go on the offensive with the sequence from 2 ... ]
;W[ni];B[li];W[nk];B[lk];W[nm];B[pm]
C[... to 8. Black has secured territory on the right, made influence in the center, and White's stones are in big trouble. <= ]
)
)