(;
GM[1]
SZ[19]
AW[db][fc][ic][qj][qc][pc][ob]
AB[cc][dd][df][cj][nb][oc][mc][pd][qd]
LB[oc:1][ob:2][nb:3]
C[Problem 71. White to play.  

Black blocks with 1 and 3. What should White do now ? ]
(;W[od]
TE[2]
C[Correct Answer.  

White should cut with 1. ]
;B[nc];W[rd];B[re];W[rc];B[qf];W[pb]
C[She can then live in the corner in sente with the moves to 7. ]
;B[oe]
C[<= ]
)
(;W[rd]
C[Failure.  

If White simply plays 1 ... ]
;B[re];W[rc]
C[... and 3, ... ]
;B[od]
C[... Black connects with 4. ]
;W[pb]
C[White lives with 5, but she ends in gote. <= ]
)
)