(;
GM[1]
SZ[19]
AW[cc][dd][cf][dp][dn][jp][mp][pf][qf][qi]
AB[db][fc][ic][qe][pd][nd][pq][po][qk][ok]
TR[dn]
C[Problem 14. Black to play.  

White has just played the marked stone, leaving her three stones in the upper right to fend for themselves. How should Black attack them ? ]
(;B[oi]
LB[rh:A]

TE[2]
C[Correct Answer.  

Black 1 is the best way to attack in this position. Black now aims at A. ]
;W[nf]
C[White escapes into the center with 2, ... ]
;B[og]
C[... Black peeps with 3, then ... ]
;W[of];B[ld]
C[... defends the territory at the top with 5. This is a basic example of how to secure territory while attacking. White's stones on the right are still vulnerable. <= ]
)
(;B[nf]
C[Failure.  

Attacking with Black 1 and ... ]
;W[oi];B[mi]
C[... 3 is in the wrong direction. Black's aim is to build a moyo towards the left, but ... ]
;W[rk];B[rl];W[rj]
LB[jd:A]
C[... White secures her stones with the sequence to 6, leaving the black stones in the lower right thin. Next, White can aim at the shoulder hit of A to reduce Black's moyo. <= ]
)
)