(;GM[1]
FF[4]
AP[Hibiscus:2.1]
SZ[19]
ST[3]
;C[How to prevent the connection? (Part 4)]
PL[B]
AB[cc][dd][df][jd][pd][pj]
AW[cb][db][fc][hc][ld]
(;B[ic]
MN[1]
(;W[hd]
;B[jf]
LB[jf:3]SQ[cb]TR[hd][ic]C[Because White was already alive
because of the squared stone, the
marked exchange doesn't really help
White here.
RIGHT]
)(;W[lf]
;B[hb]
(;W[gb]
;B[hd]
;W[gc]
;B[jb]
;W[bb]
;B[mc]
)(;W[hd]
;B[gb]
;W[ed]
;B[ee]
;W[dc]
;B[fd]
;W[ec]
;B[gc]
;W[gd]
;B[fe]
;W[cd]
;B[de]
)))(;B[jb]
C[Too passive, too low.]
)(;B[jc]
C[Too slow as White is already alive in
the top left.]
)(;B[ie]
C[Not effective as White is alive in the
top left.]
))