(;AP[goproblems]AB[cs]AB[cr]AB[dq]AB[dp]AB[co]AB[eo]AB[fo]AB[go]AB[ho]AB[ip]AB[jq]AB[ir]AB[fq]AW[eq]AW[ep]AW[fp]AW[gp]AW[fr]AW[dr]AW[ds]C[Black to kill unconditionally](;B[gr];W[gq](;B[hr];W[fs]C[=(])(;B[fs];W[hr](;B[gs];W[hs]C[=(])(;B[hs];W[gs]C[ko only])))(;B[gs];W[gr](;B[fs];W[hs]C[=(])(;B[hs];W[fs]C[=(]))(;B[fs]C[Brilliant move!](;W[gs]C[CHOICE];B[gr](;W[gq]C[CHOICE];B[hs]C[Good!RIGHT])(;W[es]C[CHOICE];B[gq]C[RIGHT])(;W[hr]C[CHOICE](;B[hs]C[RIGHT])(;B[er]C[RIGHT])))(;W[gr]C[CHOICE](;B[er]C[Good!RIGHT])(;B[hq];W[gq];B[er]C[RIGHT])(;B[gq];W[hq];B[er]C[RIGHT])))(;B[hq];W[gq])(;B[hr];W[gr](;B[hq];W[gq])(;B[gq];W[hq])(;B[es];W[er](;B[hq];W[gq])(;B[gq];W[hq])))(;B[gq];W[hq](;B[hr];W[gr])(;B[gr];W[hr])(;B[hs];W[gr]))(;B[er];W[es]))