(;GM[1]FF[4]SZ[19]
GN[B1 protects a problematic cut]
PC[http://senseis.xmp.net/?KyuExercise70/Solution]AP[GoWiki:2009]
DT[2013-03-31]
C[Diagram from http://senseis.xmp.net/?KyuExercise70/Solution

B1 protects a problematic cut]
PL[B]

AB[ha][cb][db][ib][cc][fc][gc][hc][dd][ed][de]
AW[fa][ia][ja][bb][jb][bc][ic][kc][cd][fd][gd][hd][id][ce][ee][fe][bf][df][ef]
LB[ca:a][hb:b]

;B[ec]C[B1]MN[1]

;LB[ca:a][hb:b]
)
