(;AP[goproblems]AB[rc]AB[qc]AB[pc]AB[mc]AB[lc]AW[rd]AW[qd]AW[pd]AW[od]AW[nd](;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[nb];B[nc]))(;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[mb];B[nc];W[oc];B[pb]))(;W[nc];B[ob];W[nb];B[pa]C[Black is alive!]))