(;AW[sc]AW[rc]AW[qc]AW[pc]AW[oc]AB[nb]AB[nc]AB[nd]AB[od]AB[pd]AB[qd]AB[rd]AB[mb]AB[rb]AW[ra]C[black to kill.]AP[goproblems]
(;B[sb];W[ob]
(;B[qb];W[pa]
(;B[na];W[oa]
(;B[qa]C[RIGHT])
(;B[sd];W[qa]))
(;B[sd];W[qa])
(;B[qa];W[pb]))
(;B[oa];W[pa]
(;B[qb];W[na]
(;B[qa];W[pb])
(;B[sd];W[qa])
(;B[pb];W[qa])
(;B[ma];W[qa]
(;B[oa]C[direct ko.])
(;B[sd];W[oa])))
(;B[sd];W[qb])
(;B[na];W[qb]))
(;B[qa];W[qb]
(;B[oa];W[pa])
(;B[pa];W[oa])
(;B[sa];W[ra]))
(;B[pa];W[oa]
(;B[qb];W[pb])
(;B[qa];W[qb])
(;B[na];W[qb])
(;B[sd];W[qb]))
(;B[sd];W[qb])
(;B[pb];W[qb]
(;B[pa];W[oa])
(;B[oa];W[pa])))
(;B[ob];W[sb]
(;B[pb];W[qb])
(;B[pa];W[qb])
(;B[qb];W[pb])
(;B[qa];W[qb]))
(;B[oa];W[sb]
(;B[qb];W[pb])
(;B[qa];W[qb])
(;B[pb];W[qb])
(;B[pa];W[qb]))
(;B[pb];W[qb]
(;B[sb];W[ob]
(;B[pa];W[oa])
(;B[oa];W[pa]))
(;B[ob];W[sb])
(;B[oa];W[sb])
(;B[pa];W[sb]))
(;B[pa];W[sb]
(;B[qb];W[pb])
(;B[pb];W[qb])
(;B[qa];W[qb])
(;B[oa];W[qb])
(;B[ob];W[qb]))
(;B[qb];W[sb]
(;B[pb];W[ob]
(;B[oa];W[pa])
(;B[pa];W[oa])
(;B[sd];W[pa]))
(;B[ob];W[pb])
(;B[qa];W[pb]
(;B[sa];W[pa])
(;B[pa];W[oa])
(;B[oa];W[pa]))
(;B[pa];W[pb])
(;B[oa];W[pb]))
(;B[qa];W[sb]
(;B[qb];W[pb]
(;B[sa];W[pa])
(;B[pa];W[oa])
(;B[oa];W[pa]))
(;B[pa];W[qb])
(;B[pb];W[ob]
(;B[sa];W[oa])
(;B[oa];W[qb]))
(;B[oa];W[qb])
(;B[ob];W[qb])
(;B[sa];W[qb]
(;B[ra];W[pa]
(;B[ra];W[ob])
(;B[ob];W[ra]))
(;B[pa];W[ra])
(;B[oa];W[ra])
(;B[pb];W[ob];B[oa];W[ra])))
(;B[sd];W[qb]
(;B[sb];W[ob])
(;B[ob];W[sb])
(;B[oa];W[sb])
(;B[pa];W[sb])
(;B[pb];W[ob]))
(;B[sa];W[sb]))