(;
GM[1]
SZ[19]
AW[jd][lc][nd]
AB[dd][hc][ld][pd][pf]
LB[lc:1]
C[Problem 6. Black to play.  

White attaches underneath with 1. How should  Black answer ? ]
;B[kc]
TE[2]
C[Correct Answer.  

Black should hane at 1. ]
;W[kd];B[mc]
(;W[lb];B[md];W[mb];B[nc]
LB[jc:A]
C[A sharp exchange takes place up to 7. Black now threatens A. <= ]
)
(;W[le]
LB[mc:3]
C[Variation.  

If White answers 3 with 4, ... ]
;B[lb]
C[... Black captures with 5. ]
;W[md];B[lc]
LB[me:B][ke:A]
C[After connecting at 7, Black will aim at A or B. <= ]
)
)