(;
GM[1]
SZ[19]
AW[eq][dc][oc][qo]
AB[cp][qd][pe][pq]
LB[eq:1]
TR[pe]
C[Problem 16. Black to play.  

After Black plays the marked stone, the approach move of White 1 is not good. How should Black take advantage of this mistake ? ]
;B[qk]
TR[qo]

TE[2]
C[Correct Answer.  

Black should take this opportunity to pincer the marked white stone with 1. This move makes a nice extension from Black's two stones above. Black has now taken the initiative on the right side. <= ]
)
)