(;AW[qc]AW[rc]AW[rd]AW[pc]AW[ob]AW[oa]AB[nb]AB[oc]AB[mc]AB[od]AB[pd]AB[qd]AB[re]AB[qf]AB[rb]C[Black to kill. Ko is failure]AP[goproblems]
(;B[qa]
(;W[qb]C[CHOICE]
(;B[ra];W[sb]
(;B[na];W[pb];B[sd]C[RIGHT])
(;B[sd];W[pa])
(;B[pb];W[pa])
(;B[sc];W[pa])
(;B[pa];W[pb]))
(;B[pb];W[pa])
(;B[na];W[ra]
(;B[pb];W[pa])
(;B[sd];W[sb])
(;B[sb];W[pa])
(;B[pa];W[pb])
(;B[sa];W[sd]
(;B[pb];W[sb]C[You could avoid Ko])
(;B[sc];W[sb]C[You could avoid Ko])
(;B[se];W[pb]
(;B[sb]C[You could avoid Seki])
(;B[sc];W[sb]C[You could avoid Ko]))
(;B[sb];W[sc]
(;B[ra];W[pa])
(;B[pa];W[ra]
(;B[sb];W[pb])
(;B[pb];W[sb]))
(;B[pb];W[ra]
(;B[sb];W[pa])
(;B[pa];W[sb])))
(;B[ra];W[sb]C[You could avoid Ko])
(;B[pa];W[sb]C[You could avoid Ko])))
(;B[sd];W[sb])
(;B[sc];W[sd]
(;B[sb];W[ra])
(;B[ra];W[pb])
(;B[pb];W[sb]
(;B[ra];W[pa])
(;B[na];W[ra]))
(;B[na];W[sb]
(;B[pb];W[ra])
(;B[ra];W[pb]C[Seki]))
(;B[pa];W[sb])
(;B[se];W[sb]))
(;B[sb];W[sc]
(;B[na];W[ra])
(;B[ra];W[pa])
(;B[pb];W[pa])
(;B[pa];W[ra]))
(;B[pa];W[sb]
(;B[sd];W[ra])
(;B[ra];W[sd])
(;B[na];W[ra])))
(;W[sb]C[CHOICE]
(;B[ra];W[sd];B[pb]C[RIGHT])
(;B[sd];W[qb])
(;B[qb];W[pb]
(;B[sd];W[ra]C[You could avoid Ko])
(;B[ra];W[sd])
(;B[sa];W[sd]C[You could avoid Ko]))
(;B[pb];W[qb])
(;B[pa];W[qb]
(;B[sd];W[ra])
(;B[ra];W[sd])
(;B[na];W[ra]))
(;B[na];W[ra]C[You could avoid Ko])
(;B[sa];W[ra]C[You could avoid Ko])
(;B[sc];W[sd]
(;B[na];W[qb]
(;B[pb];W[ra])
(;B[ra];W[pb]C[Seki]))
(;B[qb];W[pb];B[sa];W[ra]C[You could avoid Ko])
(;B[sa];W[ra]C[You could avoid Ko])
(;B[pb];W[qb]
(;B[ra];W[pa])
(;B[na];W[ra]))))
(;W[ra]
(;B[sb]
(;W[qb]
(;B[sd]C[RIGHT])
(;B[pa];W[sc])
(;B[na];W[pa]))
(;W[sc]
(;B[pb]C[RIGHT])
(;B[qb];W[pb]
(;B[na]C[RIGHT])
(;B[se];W[pa])
(;B[sa];W[pa])))
(;W[pb]
(;B[sd];W[sc]
(;B[sa]C[RIGHT])
(;B[qb];W[se]
(;B[sf];W[pa])
(;B[rf];W[pa])
(;B[sa];W[pa])
(;B[na];W[rf]C[White may escape...]))
(;B[se];W[qb])
(;B[na];W[se]
(;B[sf];W[qb])
(;B[qb];W[rf]C[White may escape...])
(;B[rf];W[qb])))
(;B[na];W[sc]
(;B[se];W[qb])
(;B[qb]C[RIGHT])))
(;W[pa]
(;B[sd];W[sc]
(;B[qb];W[se]
(;B[na];W[rf]C[White may escape...])
(;B[sf];W[pb]))
(;B[na];W[qb])
(;B[se];W[qb]))
(;B[qb]
(;W[pb];B[sd]C[RIGHT])
(;W[sc]
(;B[se];W[pb])
(;B[na]C[RIGHT]))
(;W[sd];B[na]C[RIGHT]))
(;B[na];W[qb])
(;B[sa];W[qb]C[You could avoid Ko])
(;B[sc];W[sd]
(;B[na];W[qb])
(;B[qb];W[pb])
(;B[se];W[qb]))))
(;B[qb];W[sb]C[You could avoid Ko])
(;B[pb];W[qb])
(;B[pa];W[sb]C[You could avoid Ko])
(;B[sa];W[qb];B[na];W[sd]
(;B[sb];W[pb]C[Seki])
(;B[pb];W[sb]C[You could avoid Ko])
(;B[pa];W[pb]
(;B[ra];W[sb])
(;B[se];W[ra];B[qa]C[You could avoid Ko and Seki])))
(;B[sd];W[sb]C[You could avoid Ko])
(;B[sc];W[sd]
(;B[pb];W[sb];B[sa];W[qb];B[sc];W[pa];B[na];W[ra]C[White lives with double Ko])
(;B[qb];W[sb]C[You could avoid Ko])
(;B[na];W[qb];B[sa];W[sb]C[You could avoid Ko]))))
(;B[pb];W[qb]
(;B[qa];W[pa])
(;B[na];W[pa])
(;B[sd];W[sb])
(;B[sb];W[qa])
(;B[ra];W[qa])
(;B[pa];W[qa]))
(;B[pa];W[pb])
(;B[qb];W[pb]
(;B[sd];W[sb]
(;B[ra];W[qa]C[You could avoid Ko])
(;B[qa];W[ra]C[You could avoid Ko]))
(;B[qa];W[sb]
(;B[ra];W[sd])
(;B[sd];W[ra]C[You could avoid Ko]))
(;B[sb];W[qa]
(;B[sd];W[sc]
(;B[se];W[ra])
(;B[na];W[se]))
(;B[sc];W[sd]))
(;B[sc];W[sd]
(;B[qa];W[sb];B[sa];W[ra]C[You could avoid Ko])
(;B[ra];W[sb])
(;B[sb];W[qa])
(;B[sa];W[qa]))
(;B[ra];W[sb]
(;B[sd];W[qa]C[You could avoid Ko])
(;B[qa];W[sd])))
(;B[ra];W[qa]
(;B[qb];W[pb]
(;B[sc];W[sb];B[pa];W[sd]C[You could avoid Ko])
(;B[sb];W[sc]C[You could avoid Ko])
(;B[sd];W[sb]C[You could avoid Ko])
(;B[na];W[sb]C[You could avoid Ko])
(;B[pa]C[];W[sb]C[You could avoid Ko]))
(;B[sd];W[sb]
(;B[qb];W[pb]C[You could avoid Ko])
(;B[pb];W[qb])
(;B[se];W[qb])
(;B[na];W[qb]))
(;B[sc];W[sd]
(;B[sb];W[qb])
(;B[qb];W[pb]C[You could avoid Ko]))
(;B[sb];W[qb])
(;B[pb];W[qb])
(;B[na];W[qb]))
(;B[sb];W[qb]
(;B[sd];W[sc]
(;B[qa];W[se]
(;B[na];W[ra])
(;B[sf];W[ra])
(;B[pb];W[pa])
(;B[pa];W[ra])
(;B[ra];W[pa]))
(;B[se];W[qa]))
(;B[sc];W[sd])
(;B[qa];W[sc]
(;B[pb];W[pa])
(;B[pa];W[ra])
(;B[na];W[ra])
(;B[ra];W[pa]))
(;B[ra];W[qa])
(;B[na];W[qa])
(;B[pb];W[qa])
(;B[pa];W[qa]))
(;B[sc];W[sd]
(;B[qa];W[qb]
(;B[na];W[pb])
(;B[ra];W[sb])
(;B[sb];W[ra])
(;B[se];W[sb]))
(;B[qb];W[pb]
(;B[qa];W[sb];B[sa];W[ra]C[You could avoid Ko])
(;B[sb];W[qa])
(;B[se];W[sb])
(;B[ra];W[sb]))
(;B[pb];W[qb])
(;B[ra];W[qb])
(;B[sb];W[qb]))
(;B[sd];W[sb]
(;B[qb];W[pb]
(;B[ra];W[qa]C[You could avoid Ko])
(;B[qa];W[ra]C[You could avoid Ko]))
(;B[ra];W[qb]
(;B[na];W[qa])
(;B[qa];W[pa])
(;B[pb];W[pa]))
(;B[qa];W[qb])
(;B[pb];W[qb])
(;B[pa];W[qa]))
(;B[na];W[qb];B[qa];W[ra];B[sa];W[sd]
(;B[pb];W[sb]C[You could avoid Ko])
(;B[ra];W[pb]
(;B[sb]C[Seki])
(;B[se]C[You could avoid Ko(T17) and Seki(T18)])
(;B[sc];W[sb]C[You could avoid Ko]))
(;B[pa];W[pb];B[se];W[ra];B[qa]C[You could avoid Ko and Seki])
(;B[sb];W[sc]
(;B[ra];W[pa])
(;B[pb];W[ra]
(;B[pa];W[sb])
(;B[sb];W[pa]))
(;B[se];W[ra])
(;B[pa];W[ra]
(;B[sb];W[pb])
(;B[pb];W[sb]))))
(;B[se];W[qb])
(;B[sa];W[qb];B[qa];W[sc]
(;B[na];W[sb])
(;B[ra];W[pa])
(;B[pb];W[pa];B[na];W[sb])))
tossy