(;AP[goproblems]AB[cr]AB[bq]AB[cp]AB[co]AB[bo]AW[bn]AW[cn]AW[dn]AW[bl]AW[fn]AW[dp]AW[dq]AW[cq]AW[fq](;W[ar];B[br];W[ao];B[ap];W[an];B[dr];W[er];B[ds];W[bs]C[RIGHT])(;W[dr];B[br];W[ao];B[ap];W[an];B[ar])(;W[ao](;B[ar]C[CHOICE];W[ap];B[bs]LB[br:A]LB[an:B])(;B[ap]C[Mistake by Black that reverts to solution.];W[ar];B[br];W[an];B[dr];W[er];B[ds];W[bs]C[RIGHT]))(;W[ap];B[ao])(;W[do];B[ap])(;W[br];B[ar](;W[bs];B[cs])(;W[dr];B[bs])(;W[ap];B[ao])(;W[ao];B[ap]))(;W[aq];B[ap](;W[dr];B[ar])(;W[br];B[ar]))(;W[bs];B[br]))