(;AP[goproblems]AB[cr]AB[cq]AB[bq]AB[ap]AB[bo]AB[ds]AB[er]AB[fq]AB[gr]AB[gp]AB[fo]AB[fn]AB[en]AB[dm]AB[bl]AB[ck]AW[br]AW[bp]AW[cp]AW[bn]AW[cn]AW[do]AW[eo]AW[ep]AW[eq]AW[dq]AW[dr]TR[ap]TR[bq]TR[cq]TR[cr]TR[ds](;W[as];B[cs];W[aq];B[ar]C[Ko! The only solution.RIGHT])(;W[co];B[ao](;W[as];B[cs];W[aq];B[ar]C[Starting at A1 with white is better, because of the extra ko threat on C5.])(;W[an];B[aq];W[ar];B[cs]C[Dead!])(;W[ar];B[aq];W[an];B[cs]C[Dead!]))(;W[an];B[ao](;W[as];B[cs];W[aq];B[ar]C[Starting at A1 with white is better, because of the extra ko threat on C5.])(;W[ar];B[aq];W[co];B[cs]C[Dead!]))(;W[aq];B[ar])(;W[cs];B[bs])(;W[ar];B[bs])(;W[bs];B[ar]))