(;
GM[1]
SZ[19]
AW[dd][cc][df][nc][dp][pb][qb][qc][qd][qf][pf][og][ph]
AB[db][fc][fe][lc][pd][ob][oc][pc][pe][pp][qh][of][nf]
LB[qh:A][pf:B][of:C][og:D][nf:E][ph:F]
C[Problem 104. Black to play.  

The position in the top left arose from a popular joseki. Black attacked with A and the sequence continues to White F. How should Black continue to press White ? ]
;B[pi]
TE[2]
C[Correct Answer.  

The hane of Black 1 is the correct continuation. Next, ... ]
(;W[oi]
C[White 2 ... ]
;B[pj];W[oj]
C[... and 4 are not good. ]
;B[pk]
LB[pj:3]
C[Black makes territory along the fourth line with 3 and 5, while White gains nothing for her efforts. <= ]
)
(;W[qi]
C[White might cut with 1, ... ]
;B[qj]
C[... but Black plays 3 ... ]
;W[ri];B[pj]
C[... and 5 in sente. ]
(;W[rh];B[oh]
C[He then confines White's stones to the upper right with 7 ... ]
;W[qg];B[ng]
C[... and 9. This result is also good for Black. <= ]
)
(;W[ng]
C[If White pushes up with 2, ... ]
;B[mg]
C[... Black must hane at 3. ]
;W[mf]
C[White cuts with 4, ... ]
;B[nd];W[oi];B[pj];W[oj];B[pk];W[ok]
LB[oj:8][oi:6]
C[... reinforces her stones with 6 to 10, ... ]
;B[pl];W[me]
C[... then switches to the top ... ]
;B[md];W[kf]
LB[lg:A]
C[... with the sequence to 14. With all of his stones secure, Black can now fight by extending to A. <= ]
)
(;W[rj]
LB[rh:@]
C[Variation.  

Instead of 6 at @, Black should not turn at 6 here. If he does, ... ]
;B[oh];W[pg];B[ng]
C[... Black 9 will become sente, ... ]
;W[rg];B[fg]
LB[ql:A]
C[... so Black can expand his moyo with 11, while attacking White's position an the left side. If Black later comes back to defend the lower right, the shape move is A. <= ]
))
)