(;GM[1]FF[4]SZ[19]
GN[Variation 1]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem18/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem18/Solution

Variation 1]
PL[B]

AB[bp][bq][cq][eq][er]
AW[cn][fn][bo][ap][cp][dp][fp][fq][fr]
LB[br:a][cr:b]

;B[bs]C[B1]MN[1]
;W[ar]C[W2]MN[2]
;B[aq]C[B3]MN[3]
;W[dq]C[W4]MN[4]
;B[dr]C[B5]MN[5]
;W[es]C[W6]MN[6]
;B[ds]C[B7]MN[7]

;LB[br:a][cr:b]
)
