(;
GM[1]
SZ[19]
AW[jc][lb][nc]
AB[dd][hc][lc][pd][pf]
LB[lb:1]
C[Problem 13. Black to play.  

White attaches with 1. What should Black do ? ]
(;B[mb]
LB[jp:B][kb:A]

TE[2]
C[Correct Answer.  

There are two Correct Answers: Black 1 and A.  

Black might even play elsewhere (B). <= ]
)
(;B[kb]
TE[2]
C[Correct Answer.  

Also correct. <= ]
)
(;B[jp];W[ld]
C[Variation.  

If Black played elsewhere, White might then attach from above with 2. ]
;B[oc]
C[Black forces with 3 ... ]
;W[nd];B[nb]
C[... and 5, ... ]
(;W[mb]
C[... then takes sente again. <= ]
)
(;W[mb]))
)