(;GM[1]FF[4]SZ[19]
GN[Solution:ko]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem20/Solution]AP[GoWiki:2009]
DT[2023-02-15]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem20/Solution

Solution:ko]
PL[W]

AB[ep][fp][cq][dq][eq][gq][hq][jq][kq][ar][br][gr][ir]
AW[hn][bo][eo][fo][go][ap][cp][dp][gp][hp][ip][aq][bq][fq][iq][fr]
CR[ar][br]
LB[es:a]

;W[cr]C[W1]MN[1]
;B[dr]C[B2]MN[2]
;W[fs]C[W3]MN[3]
;B[hr]C[B4]MN[4]
;W[ds]C[W5]MN[5]
;B[cs]C[B6]MN[6]
;W[er]C[W7]MN[7]

;CR[ar][br]
LB[es:a]
)
