(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?OD1PAug13Problem/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?OD1PAug13Problem/Solution

Solution]
PL[B]

AB[do][eo][fo][dp][dq][eq][cr][er][ds]
AW[bm][cm][dm][fm][gn][go][cp][ep][fp][hp][bq][cq][fq][fr][fs]
LB[aq:b][bs:a]

;B[br]C[B1]MN[1]
;W[ar]C[W2]MN[2]
;B[bo]C[B3]MN[3]
;W[co]C[W4]MN[4]
;B[cn]C[B5]MN[5]
;W[bn]C[W6]MN[6]
;B[ap]C[B7]MN[7]
;W[dn]C[W8]MN[8]
;B[es]C[B9]MN[9]

;LB[aq:b][bs:a]
)
