(;AB[rc]AB[qc]AB[pc]AB[mc]AB[lc]AW[rd]AW[qd]AW[pd]AW[od]AW[nd]AP[goproblems]
(;W[ob];B[oc];W[nc];B[pb]C[FORCE];W[nb]
(;B[rb]
(;W[qa];B[pa]
(;W[sc];B[sb];W[ra]C[Cleanly killed, good job.CHOICERIGHT])
(;W[ra]
(;B[sc];W[sa]C[Black is dead, this is not seki because white can always make a bent 4 in corner.RIGHT])
(;B[sa]C[CHOICE]
(;W[sc]C[Black is dead, good job.RIGHT])
(;W[sb];B[sc]
(;W[sa];B[qb];W[ra];B[sa];W[sb];B[qa]C[Black managed to live!])
(;W[sd];B[sa]C[There's no need for a ko.])
(;W[oa];B[sa]C[There's no need for a ko])))))
(;W[sc];B[sb];W[qa];B[pa];W[ra]C[RIGHT]))
(;B[ra]
(;W[sb];B[sc]
(;W[pa];B[qa];W[rb]C[Cleanly killed, good job.CHOICERIGHT])
(;W[rb];B[pa];W[qb]C[Black is dead, good job.RIGHT]))
(;W[pa];B[sb];W[qa];B[qb]C[Black is alive!]))
(;B[pa];W[sc];B[sb];W[ra]C[RIGHT])
(;B[sc];W[pa];B[qa];W[rb]C[RIGHT])
(;B[qa];W[rb]C[RIGHT])
(;B[sb];W[ra]C[RIGHT]))
(;W[oc];B[ob];W[nb];B[pa]
(;W[nc];B[ra]C[Black is alive!])
(;W[ra];B[nc]C[Black is alive!]))
(;W[nb];B[ob]
(;W[nc];B[pa]C[Black is alive!])
(;W[oc];B[pa]
(;W[nc];B[ra]C[Black is alive!])
(;W[ra];B[nc]C[Black is alive!])))
(;W[nc];B[ob];W[nb];B[pa]C[Black is alive!]))