(;AB[re]AB[qe]AB[qd]AB[pc]AB[oc]AB[mc]AW[rd]AW[rc]AW[rb]AW[ra]AW[pb]C[Black to kill]AP[goproblems]
(;B[pa]
(;W[ob]
(;B[nb];W[oa]
(;B[qb];W[qa];B[qc]C[RIGHT])
(;B[na];W[qb]))
(;B[qb];W[qc]
(;B[nb];W[qa])
(;B[oa];W[nb])
(;B[na];W[nb];B[mb];W[qa]
(;B[ma];W[oa])
(;B[oa];W[ma]))))
(;W[qa];B[qc];W[ob];B[nb];W[oa];B[qb]C[RIGHT]))
(;B[ob];W[pa])
(;B[sd];W[ob]
(;B[nb];W[qc])
(;B[qb];W[qc]))
(;B[qc];W[qb]
(;B[ob];W[pa])
(;B[oa];W[pa])
(;B[pa];W[ob]
(;B[nb];W[oa])
(;B[oa];W[nb])))
(;B[qb];W[qc]
(;B[ob];W[qa])
(;B[pa];W[ob]
(;B[nb];W[qa])
(;B[oa];W[nb])
(;B[na];W[nb];B[mb];W[qa]
(;B[ma];W[oa])
(;B[oa];W[ma]))))
(;B[sb];W[qc]))