(;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])))