(;AB[rc]AB[qd]AB[pc]AB[pb]AB[ob]AW[nb]AW[na]AW[mc]AW[oc]AW[od]AW[pd]AW[qe]AW[re]AW[pf]AW[rb]AP[goproblems]
(;B[ra];W[qb]
(;B[sb];W[qa]
(;B[qc];W[sa]
(;B[pa];W[sc];B[sd];W[rd];B[sb]C[Very good, ko, black takes first.RIGHT])
(;B[sd];W[sc];B[pa];W[rd];B[sb]C[Very good, ko, black takes first.RIGHT]))
(;B[pa];W[sa]
(;B[qc];W[sc];B[sd];W[rd];B[sb]C[Very good, ko, black takes first.RIGHT])
(;B[sd];W[sc];B[qc];W[rd];B[sb]C[Very good, ko, black takes first.RIGHT]))
(;B[sd];W[oa]))
(;B[qa];W[sb])
(;B[oa];W[qc])
(;B[qc];W[sb]TR[sc]TR[oa])
(;B[rd];W[pa]))
(;B[qb];W[ra]
(;B[rd];W[qa])
(;B[sb];W[rd])
(;B[qa];W[oa]
(;B[sb];W[rd])
(;B[rd];W[pa])))
(;B[sb];W[ra]
(;B[qb];W[rd])
(;B[rd];W[qb]
(;B[sd];W[qc])
(;B[qc];W[sd]))
(;B[oa];W[rd]
(;B[qb];W[qa])
(;B[qc];W[qa])))
(;B[oa];W[rd]))