(;
GM[1]
SZ[19]
AW[kc][ld][od][qd][oc][bd][cf][ci]
AB[cc][dd][fd][ic][mc][pc]
LB[pc:1][oc:2]
C[Problem 117. Black to play.  

In answer to Black 1, White blocks on the other side with 2. How should Black respond ? ]
;B[pd]
TE[2]
C[Correct Answer.  

Black makes life in the corner ... ]
;W[pe];B[qc]
(;W[qe]
LB[qc:3]
;B[ob];W[nb];B[pb];W[nc];B[rd];W[re];B[rc]
LB[oe:A]
C[... with the moves to 11. White must now defend against the cut at A. <= ]
)
(;W[oe]
C[Variation.  

When Black plays 3, White could connect at 4, ... ]
(;B[re]
C[... but Black 5 becomes a tesuji. <= ]
)
(;B[ob]
C[Black could also play 5 here first, ... ]
;W[nb];B[pb];W[nc];B[re]
C[... then come back and play 9. <= ]
))
)