(;AB[bp]AB[br]AB[bq]AB[dr]AB[er]AW[ar]AW[ao]AW[bo]AW[co]AW[cp]AW[dq]AW[eq]AW[fr]AW[fs]C[Black to live.]AP[goproblems]
(;B[ap];W[ds])
(;B[aq];W[ds])
(;B[cq];W[cs]
(;B[ap];W[ds])
(;B[aq];W[ds])
(;B[cr];W[aq];B[ap];W[es])
(;B[bs];W[ds])
(;B[ds];W[ap];B[aq];W[es]))
(;B[cr];W[es]
(;B[ap];W[ds]
(;B[cs];W[as])
(;B[as];W[cs]))
(;B[aq];W[ds]
(;B[cs];W[as])
(;B[as];W[cs]))
(;B[ds];W[bs])
(;B[as];W[bs])
(;B[bs];W[ds])
(;B[cs];W[as]))
(;B[es];W[cr])
(;B[ds];W[cr])
(;B[as];W[bs]
(;B[ap];W[cr])
(;B[aq];W[cr])
(;B[cq];W[ap])
(;B[cr];W[es])
(;B[cs];W[ap])
(;B[es];W[cr])
(;B[ds];W[cr]))
(;B[bs];W[ds])
(;B[cs];W[es]
(;B[ds];W[ap])
(;B[ap];W[ds])
(;B[aq];W[ds])
(;B[cr];W[as])
(;B[bs];W[cq])
(;B[cq];W[ds]C[multistage ko])
(;B[as];W[ds];B[cr]C[:)RIGHT])))