(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.00]TM[]
PW[White]PB[Black]AW[na][qa][nb][ob][qb][nc][qc][nd][qd][rd][sd][oe][of][rf][og][rg][oh][qh][sh][qi]AB[oa][pa][pb][rb][oc][pc][sc][od][pd][pe][qe][re][se][qf][sf][qg]C[how can white win this?]PL[W]
(;W[ra]CR[ra]
(;B[sb]CR[sb]
(;W[pg]CR[pg]C[RIGHT])
(;W[pf]CR[pf]C[RIGHT])
(;W[sg]CR[sg]C[RIGHT]))
(;B[sa]CR[sa]
(;W[sb]CR[sb]C[RIGHT CHOICE
black can play ko like this])
(;W[pg]CR[pg]
;B[rc]CR[rc])
(;W[pf]CR[pf]
;B[rc]CR[rc])
(;W[sg]CR[sg]
;B[rc]CR[rc])))
(;W[rc]CR[rc]
;B[ra]CR[ra])
(;W[sb]CR[sb]
;B[sa]CR[sa]
(;W[pg]CR[pg]
;B[ra]CR[ra])
(;W[pf]CR[pf]
;B[ra]CR[ra])
(;W[sg]CR[sg]
;B[ra]CR[ra]))
(;W[sa]CR[sa]
;B[ra]CR[ra])
(;W[pg]CR[pg]
;B[ra]CR[ra]
(;W[pf]CR[pf]
;B[rc]CR[rc])
(;W[sg]CR[sg]
;B[rc]CR[rc]))
(;W[pf]CR[pf]
;B[ra]CR[ra]
(;W[pg]CR[pg]
;B[rc]CR[rc])
(;W[sg]CR[sg]
;B[rc]CR[rc]))
(;W[sg]CR[sg]
;B[ra]CR[ra]
(;W[pf]CR[pf]
;B[rc]CR[rc])
(;W[pg]CR[pg]
;B[rc]CR[rc]))
(;W[ph]CR[ph]
;B[ra]CR[ra]))