(;AP[goproblems]AB[sb]AB[rc]AB[qd]AB[pd]AB[od]AB[nd]AB[mc]AB[lc]AB[lb]AB[pa]AW[qb]AW[rb]AW[ra]AW[pc]AW[oc]AW[nc]AW[mb]AW[na]AW[oa]C[Black to kill.](;B[la](;W[ma](;B[ob];W[nb];B[pb]C[RIGHT])(;B[pb];W[ob])(;B[qc];W[pb])(;B[nb];W[ob]))(;W[pb](;B[nb]C[RIGHT])(;B[ma];W[nb])(;B[qc];W[ma])))(;B[pb];W[ob])(;B[qc];W[pb](;B[nb];W[ob](;B[la];W[ma])(;B[ma];W[la]))(;B[la];W[ma]))(;B[ob];W[pb])(;B[nb];W[ob](;B[la];W[ma])(;B[ma];W[la])))