(;GM[1]FF[4]SZ[19]
GN[After W1 Black can force a ko]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem319/Attempts]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem319/Attempts

After W1 Black can force a ko]
PL[W]

AB[ob][lc][mc][oc][kd][nd][od][pd][pe][pf][pg][ph]
AW[oa][nb][pb][nc][pc][md][me][nf][qf][rf][nh][qh][pi][qi]

;W[rc]C[W1]MN[1]
;B[qc]C[B2]MN[2]
;W[qb]C[W3]MN[3]
;B[qd]C[B4]MN[4]
;W[rb]C[W5]MN[5]
;B[rd]C[B6]MN[6]
;W[sc]C[W7]MN[7]
;B[ra]C[B8]MN[8]
;W[sd]C[W9]MN[9]
;B[se]C[B10]MN[10]

;
)
