(;GM[1]FF[4]SZ[19]
GN[Solution: W makes a favorable ko]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem307/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem307/Solution

Solution: W makes a favorable ko]
PL[W]

AB[jn][kn][io][ko][ip][kp][hq][jq][fr][gr][kr][fs][gs][hs][ls]
AW[hm][jm][km][gn][in][ln][ho][lo][hp][lp][eq][fq][gq][kq][lq][er][mr][es]
CR[jp]

;W[ir]C[W1]MN[1]
;B[iq]C[B2]MN[2]
;W[jr]C[W3]MN[3]
;B[js]C[B4]MN[4]
;W[lr]C[W5]MN[5]
;B[hr]C[B6]MN[6]

;CR[jp]
)
