(;AP[goproblems]AB[sb]AB[sc]AB[rd]AB[re]AW[rc]AW[qc]AW[rb]AW[qa]AW[pb]AW[ob]AB[mb]AB[nc]AB[md]AB[pc]AB[pd]AB[pf]C[Black to kill the white group!!!](;B[oa];W[na](;B[nb]C[RIGHT])(;B[ma];W[nb])(;B[oc];W[nb])(;B[qd];W[nb])(;B[ra];W[sa]))(;B[pa];W[ra](;B[na];W[oa])(;B[oa];W[na])(;B[nb];W[oa])(;B[oc];W[oa]))(;B[sa];W[oa])(;B[ra];W[oa])(;B[oc];W[oa])(;B[nb];W[oa])(;B[na];W[oa])(;B[qd];W[oa]))