(;GM[1]FF[4]SZ[19]
GN[Observation (W9 at W5)]
PC[http://senseis.xmp.net/?RTGProblem66/Solution]AP[GoWiki:2009]
DT[2009-11-10]
C[Diagram from http://senseis.xmp.net/?RTGProblem66/Solution

Observation (W9 at W5)]
PL[W]

AB[bk][ik][cl][el][gl][il][bm][cm][em][fm][gm][hm][an][cn][fn][in][jn][go][ho][hp][ip][bq][fq][gq][ar][cr][dr][gr][hr][ir][bs][fs][js]
AW[bj][cj][ck][ek][fk][gk][hk][al][bl][fl][hl][bn][dn][en][bo][eo][io][jo][bp][cp][fp][gp][jp][cq][dq][eq][iq][kq][er][fr][jr][kr][ds][gs][is]
LB[co:a]

;W[es]C[W1]MN[1]
;B[hs]C[B2]MN[2]
;W[cs]C[W3]MN[3]
;B[ep]C[B4]MN[4]
;W[aq]C[W5]MN[5]
;B[ap]C[B6]MN[6]
;W[ao]C[W7]MN[7]
;B[am]C[B8]MN[8]
;W[aq]C[W9]MN[9]

;LB[co:a]
)
