(;AP[goproblems]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](;B[qb](;W[qa](;B[qc]C[White has just one true eye. White is deadRIGHT])(;B[pc];W[qc])(;B[sc];W[qc])(;B[sb];W[qc]))(;W[qc](;B[pc]C[RIGHT])(;B[sc];W[qa])(;B[sb];W[qa])))(;B[qa];W[qb](;B[sc];W[sb]C[White lives])(;B[sb];W[sc]))(;B[sb];W[qc];B[sc];W[qa])(;B[sc];W[qc](;B[qa];W[sb])(;B[sb];W[qa])(;B[pc];W[qa]))(;B[qc];W[qb](;B[sc];W[sb])(;B[sb];W[sc]))(;B[pc];W[qb](;B[sc];W[sb])(;B[sb];W[sc])))