(;
GM[1]
SZ[19]
AW[fq][lp][pm][nj][qf][ko][ln][mo][ch][eh]
AB[jp][jd][pj][dj][dp][pd][pp][dd][dn][np][nf][nd][lq][kp][mp][cf]
LB[cf:1][eh:2]
C[Problem 16. Black to play.  

This is the continuation of the game in Problem 12. Black exchanged 1 for White 2. How should he continue ? ]
(;B[cj]
TE[2]
C[Correct Answer.  

Black 1 defends the territory on the lower left, preventing any white countermeasures there. ]
;W[fd]
C[If White switches to the top with 2, ... ]
;B[fe]
C[... Black can attach with 3. ]
;W[ge];B[ff];W[ed];B[de]
C[After the sequence to Black 7, the prospects for White's stones on the left area bleak. <= ]
)
(;B[fd]
C[How the game continued.  

Reinforcing the top with Black 1 ... ]
;W[dl]
C[... gave White the chance to play on the left side with 2. See Problem 20 for the continuation of this game. ]
)
)