(;GM[1]FF[4]SZ[19]
GN[]
PC[http://senseis.xmp.net/?GokyoShumyoSection4Problem20/Attempts]AP[GoWiki:2009]
DT[2011-02-07]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection4Problem20/Attempts

]
PL[B]

AB[ck][cl][cm][dn][fn][do][dp][ep][fp][bq][cq][eq][gq][iq][br][gr]
AW[bk][bl][bm][dm][em][cn][co][cp][gp][dq][fq][cr][dr][er][fr][bs]

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

;
)
