(;AW[rc]AW[rb]AW[qc]AW[pc]AW[ob]AW[oa]AB[qb]AB[oc]AB[nc]AB[nb]AB[mc]AB[pd]AB[qd]AB[rd]AB[sd]C[B to move]AB[lc]AP[goproblems]
(;B[pb];W[qa]
(;B[sb]C[Well done! W is dead thanks to lack of liberties!RIGHT]MA[sc])
(;B[sc];W[sb]C[Alive!])
(;B[na];W[pa]C[Alive!]))
(;B[sc];W[qa]C[Miai, alive!]MA[pb]MA[sb])
(;B[sb]
(;W[pb]
(;B[qa];W[sc]C[Only ko!]LB[ra:1]LB[sa:2])
(;B[sc];W[qa]C[Alive!]))
(;W[sc];B[pb])
(;W[qa];B[pb]))
(;B[ra];W[qa]
(;B[pa];W[pb]MA[qa]MA[sc]C[Miai, alive!])
(;B[sc];W[pb])
(;B[sb];W[pb])
(;B[pb];W[sa])
(;B[na];W[sa]))
(;B[pa]
(;W[pb]C[Alive!CHOICE])
(;W[ra]C[Alive!CHOICE]))
(;B[qa];W[ra]C[Alive!])
(;B[na];W[pb]C[Alive!]))