(;
GM[1]
SZ[19]
AW[md][nc][oc][pc][qb][cn][gd][dg]
AB[jp][jd][pj][dj][dp][pd][pp][dd][od][nd][ne][qc][cl][rc]
LB[gd:2][cl:1]
TR[cn]
C[Problem 7. Black to play.  

This is a continuation of Problem 3. Black 1 restricted the movement of the marked stone, so White plays elsewhere, making an approach with 2. How should Black answer ? ]
(;B[ef]
TE[2]
C[Correct Answer.  

Black 1 keeps the two white stones separated. ]
;W[eg]
C[White first pushes up with 2, ... ]
;B[ff];W[dc]
C[... then counterattacks by attaching with 4. ]
;B[ec]
C[Black hanes with 5, ... ]
;W[ed]
C[... but White responds strongly by crosscutting with 6. ]
;B[fd];W[fc];B[eb];W[fe];B[ee]
C[After Black 11, ... ]
;W[fd]
C[... White connects with 12 and ... ]
;B[cc];W[de];B[cd];W[fb];B[db];W[df]
C[... the sequence to 18 is inevitable, but Black is alive in the corner and, ... ]
;B[gf]
C[... when he extends to 19, White is in trouble. ]
(;W[ie]
C[If White goes for the top with 20 ... ]
;B[gh];W[je]
C[... and 22, ... ]
;B[ei]
LB[gh:21]
C[... Black will secure the upper left side with 21 and 23. Moreover, White still needs another move to secure the top. <= ]
)
(;W[ei]
C[On the other hand, if White plays 20 here, ... ]
;B[ie]
C[Black will play 21 and the six white stones at the top left are in trouble. <= ]
))
(;B[lc]
C[How the game continued.  

Black attacked the stones in the upper right with 1 ... ]
;W[mc];B[lb]
C[... and 3, ... ]
;W[ld]
C[... but White forced with 4, ... ]
;B[jc];W[lf]
C[... then jumped to 6. Black's moyo on the right was no longer impressive and his stones at the top become heavy. See Problem 11 for the continuation. <= ]
)
(;B[me]
TR[jd]
C[Variation.  

In Black wants to play on the right, driving White towards the marked stone with 1 ... ]
;W[ld];B[le]
C[... and 3 is the right direction. Black's moyo on the right is huge. ]
(;W[kd]
C[White must not play 4 ... ]
;B[ke]
C[... because she will be short of liberties after Black 5. <= ]
)
(;W[ke]
C[If White hanes at 4, ... ]
;B[kd]
C[... White's stones at the top are in danger after Black 5. <= ]
))
)