(;GM[1]FF[4]CA[UTF-8]
SZ[19]RU[Japanese]KM[0]TM[1800,0,30,5]PW[]PB[]AB[bq][bp][bo][cp]AW[cr][cq][dq][dp]AB[do]AW[co][cn][er][fr]AB[eq][ep][fq][gq][gr][es][gs]AW[cm][eo]AB[dn]AW[fn][em][dl][ck]TR[bo][bp][bq][cp]C[can black save the marked stones?]
(;B[bs]CR[bs]
;W[br]CR[br]
(;B[ar]CR[ar]
;W[ds]CR[ds]
(;B[fs]CR[fs]
;W[en]CR[en]
(;B[dr]CR[dr]
;W[er]CR[er]
(;B[fr]CR[fr]
;W[dm]CR[dm]
(;B[dr]CR[dr]C[RIGHT
ko])
(;B[do]CR[do]
;W[dn]CR[dn]
;B[dr]CR[dr]C[ko, but you've wasted an internal ko threat]))
(;B[cs]CR[cs]
;W[as]CR[as]))
(;B[cs]CR[cs]
;W[as]CR[as]))
(;B[cs]CR[cs]
;W[as]CR[as])
(;B[bn]CR[bn]
;W[fs]CR[fs]
;B[bm]CR[bm]
;W[bl]CR[bl]))
(;B[cs]CR[cs]
;W[ar]CR[ar]))
(;B[br]CR[br]
;W[bs]CR[bs]
(;B[ds]CR[ds]
;W[cs]CR[cs])
(;B[fs]CR[fs]
;W[cs]CR[cs])
(;B[ar]CR[ar]
;W[cs]CR[cs]))
(;B[ds]CR[ds]
;W[br]CR[br]
;B[dr]CR[dr]
;W[dm]CR[dm])
(;B[bn]CR[bn]
;W[br]CR[br]
(;B[bm]CR[bm]
;W[bl]CR[bl])
(;B[bl]CR[bl]
;W[bm]CR[bm]
;B[am]CR[am]
;W[bj]CR[bj]))
(;B[ar]CR[ar]
;W[bs]CR[bs]
(;B[br]CR[br]
;W[cs]CR[cs])
(;B[ds]CR[ds]
;W[en]CR[en]))
(;B[cs]CR[cs]
;W[br]CR[br]
(;B[ar]CR[ar]
;W[bs]CR[bs]
(;B[dr]CR[dr]
;W[ds]CR[ds])
(;B[ds]CR[ds]
;W[en]CR[en]))
(;B[bs]CR[bs]
;W[ar]CR[ar]))
(;B[ap]CR[ap]
;W[br]CR[br])
(;B[aq]CR[aq]
;W[br]CR[br])
(;B[ao]CR[ao]
;W[br]CR[br])
(;B[bm]CR[bm]
;W[br]CR[br]
(;B[aq]CR[aq]
;W[bn]CR[bn])
(;B[bn]CR[bn]
;W[bl]CR[bl])))