(;
GM[1]
SZ[19]
AW[ja][jb][jc][kc][ld][me][od][pc][qc]
AB[dc][ce][ic][ib][kb][lb][mc][md][rc][qd][re][pf]
LB[ja:2][ib:1]
C[Problem 43. Black to play.  

White stops Black from linking up by descending to 2. What should Black do ? ]
;B[ne]
TE[2]
C[Correct Answer.  

Black should play 1, isolating the three white stones on the right. ]
;W[nd]
C[If White cuts with 2, ... ]
;B[nb]
C[... Black makes shape with 3. ]
;W[le]
C[White must defend with 4, but, ... ]
;B[oe]
C[... after 5, the four white stones on the right are dead. <= ]
)
)