(;GM[1]FF[4]SZ[19]
GN[Main line]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem16/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem16/Solution

Main line]
PL[B]

AB[bq][dq][cr][er][fs]
AW[co][bp][cp][ep][cq][fq][fr][hr]

;B[aq]C[B1]MN[1]
;W[bs]C[W2]MN[2]
;B[br]C[B3]MN[3]
;W[eq]C[W4]MN[4]
;B[as]C[B5]MN[5]
;W[ar]C[W6]MN[6]
;B[cs]C[B7]MN[7]

;
)
