(;
GM[1]
SZ[19]
AW[cd][dg][hd][ie][jf][kf][mg][mf][lg][od][co]
AB[cb][ec][fd][lf][le][ke][je][me][ld][jc][mc][qd][pp]
C[Problem 85. Black to play.  

How should Black play in this position ? ]
;B[if]
TE[2]
C[Correct Answer.  

Black should cut at 1. ]
;W[hf]
C[White ataris with 2 to rescue her stones at the top. ]
;B[ig];W[kg]
C[After White connects with 4, ... ]
;B[eg]
C[... Black leans on the left-side stones by attaching with 5. ]
(;W[hg]
C[White must push out with 6, ... ]
;B[dh]
C[... and Black takes the initiative on the left with 7 ... ]
;W[ch];B[ci]
C[... and 9. ]
;W[cg];B[di];W[ee]
C[White expands her eye space with 12 ... ]
;B[fe];W[ef]
C[... and 14, ... ]
;B[ff];W[ih]
C[... then secures the center with 16. See Problem 129 for Black's continuation. <= ]
)
(;W[dh]
TR[eg]
C[If White defends against the attachment of the marked stone by extending to 6, ... ]
;B[df]
C[... Black will exchange 7 ... ]
;W[cf]
C[... for 8, ... ]
;B[hg];W[gf];B[gg];W[ff];B[ef];W[fg];B[fh];W[eh];B[fe]
C[... then trap the white stones at the top with the sequence to 17. <= ]
)
)