(;GM[1]FF[4]SZ[19]
GN[the key move]
PC[http://senseis.xmp.net/?GokyoShumyoSection4Problem48/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection4Problem48/Solution

the key move]
PL[B]

AB[gb][bc][cc][fc][gc][dd][ed][ce]
AW[cb][fb][dc][ec][bd][cd][be][cf]
LB[da:c][db:a][eb:b]

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

;LB[da:c][db:a][eb:b]
)
