(;AP[goproblems]AW[br]AW[ds]AW[es]AB[cq]AB[dq]AB[eq]AB[er]AB[fr]AB[fs]AB[gq]AB[gp]AB[fp]AB[ep]AW[do]AW[eo]AW[fo]AW[go]AW[hp]AW[ho]AW[hq]AW[hr]AW[gs]AW[bq]AW[bo]AB[cp]AB[dp]AW[co]AB[bp]AW[ap]AW[bn]C[Black to live](;B[cr];W[cs](;B[bs];W[as](;B[dr](;W[bs];B[aq]C[Well done!CHOICERIGHT])(;W[ar];B[bs];W[cs];B[ds]C[Well done!CHOICERIGHT]))(;B[aq](;W[ar];B[dr];W[ao];B[bs];W[cs];B[ds]C[Well done!RIGHT])(;W[ao];B[dr];W[ar];B[bs];W[cs];B[ds]C[Well done!RIGHT])(;W[bs];B[ao];W[an];B[ap]C[Well done!RIGHT]))(;B[ar];W[aq];B[dr];W[bs])(;B[ao];W[aq];B[dr];W[an];B[bs];W[cs];B[ds]C[Well done!RIGHT]))(;B[dr];W[bs])(;B[aq];W[ao](;B[bs];W[as];B[dr];W[ar])(;B[dr](;W[ar];B[bs];W[cs];B[ds]C[Well done!RIGHT])(;W[bs];B[ar]C[Well done!RIGHT]))(;B[ar](;W[as];B[dr](;W[aq];B[bs];W[cs];B[ds]C[Well done!RIGHT])(;W[bs];B[aq]C[Well done!RIGHT]))(;W[bs];B[dr]C[RIGHT])))(;B[ar];W[aq](;B[dr];W[bs])(;B[bs];W[as];B[dr];W[bs]))(;B[ao];W[aq](;B[bs];W[as];B[dr];W[an];B[bs];W[cs];B[ds]C[Well done!RIGHT])(;B[dr];W[bs]))(;B[as];W[bs](;B[aq];W[ar])(;B[dr];W[gr])))(;B[cs];W[cr](;B[dr];W[ds])(;B[aq];W[ar](;B[bs];W[dr])(;B[dr];W[ds])))(;B[aq](;W[cr](;B[ao];W[ar](;B[cs];W[ap];B[dr];W[ds]C[FORCE];B[aq]C[Ko is not the best you can get])(;B[dr](;W[ap];B[cs];W[ds]C[FORCE];B[aq]C[Ko is not the best you can get])(;W[cs];B[bs];W[ap]C[Ko]))(;B[bs](;W[ap]C[White can choose to fight the ko (by playing this variation) or to settle for a seki.CHOICE])(;W[an];B[ap];W[gr];B[cs];W[as];B[cs];W[bs]C[White can choose to fight the ko or to settle for a seki (by playing this variation).CHOICE]))(;B[ap];W[bs];B[dr];W[gr];B[cs];W[ds];B[es];W[an]C[This leads to a ko.]))(;B[dr];W[ar];B[cs];W[ds])(;B[bs];W[ar];B[dr];W[cs]))(;W[ar];B[cr];W[cs];B[bs];W[as];B[dr];W[ao];B[bs];W[cs];B[ds]C[Well done!RIGHT]))(;B[bs];W[cr](;B[aq];W[ar];B[dr];W[cs])(;B[dr];W[aq](;B[cs];W[ds])(;B[ar];W[ao];B[cs];W[ds])(;B[ao];W[an];B[cs];W[ds]))(;B[ar];W[aq](;B[dr];W[ao];B[cs];W[ds])(;B[ao];W[an];B[dr];W[ao];B[cs];W[ds]))(;B[ao];W[aq](;B[dr];W[an];B[cs];W[ds])(;B[ar];W[an];B[dr];W[ao];B[cs];W[ds])))(;B[dr];W[cs](;B[aq];W[ar](;B[cr];W[bs])(;B[bs];W[cr]))(;B[ar];W[gr];B[cr];W[fq])(;B[cr];W[bs])(;B[ao];W[aq];B[cr];W[bs])(;B[bs];W[cr](;B[ar];W[as]C[Ko])(;B[ao];W[aq])(;B[aq];W[ar])))(;B[ao];W[cr](;B[aq];W[ar](;B[cs];W[ap];B[dr];W[ds]C[FORCE];B[aq]C[Ko is not the best you can get])(;B[dr](;W[ap];B[cs])(;W[cs];B[bs];W[ap]C[Ko]))(;B[bs](;W[ap]C[White can choose to fight the ko (by playing this variation) or to settle for a seki.CHOICE])(;W[an];B[ap];W[gr];B[cs];W[as];B[cs];W[bs]C[White can choose to fight the ko or to settle for a seki (by playing this variation).CHOICE]))(;B[ap];W[bs];B[dr];W[gr];B[cs];W[ds];B[es];W[an]C[This leads to a ko.]))(;B[dr];W[aq];B[cs];W[ds])(;B[bs];W[aq](;B[dr])(;B[ar]))(;B[ar];W[aq];B[cs];W[as];B[dr];W[ds]))(;B[ar];W[cr](;B[dr];W[cs])(;B[cs];W[dr])(;B[aq];W[as])(;B[bs];W[dr])))