(;AB[rd]AB[qd]AB[pd]AB[oc]AB[nc]AB[nb]AB[na]AB[pa]AW[oa]AW[ob]AW[pb]AW[rc]AW[rb]AW[ra]C[Black to play. Kill the White group]AP[goproblems]
(;B[qb]C[White is deadRIGHT]
(;W[qa];B[qc]C[White has just one true eye. White is deadRIGHT])
(;W[qc];B[pc]C[RIGHT]))
(;B[qa]
(;W[qb];B[sc];W[sb]C[White lives])
(;W[sc];B[qb];W[qc];B[qb]
(;W[pc])
(;W[qa]))
(;W[sb];B[qc];W[qb]))
(;B[sb];W[qc];B[sc];W[qa])
(;B[sc];W[qc]
(;B[qa];W[sb])
(;B[sb];W[qa])))