(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem73/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem73/Solution

Main line]
PL[B]

AB[eb][gb][gc][hc][nc][gd][jd][kd][nd][pd][he][ie][jf]
AW[cb][hb][jb][ic][lc][ed][hd][id][md][ce][fe][ge][me]
LB[ha:a]

;B[kb]C[B1]MN[1]
;W[lb]C[W2]MN[2]
;B[ja]C[B3]MN[3]
;W[kc]C[W4]MN[4]
;B[ib]C[B5]MN[5]
;W[ia]C[W6]MN[6]
;B[jc]C[B7]MN[7]

;LB[ha:a]
)
