(;AW[sb]AW[rc]AW[qc]AW[qd]AW[od]AW[oe]AW[of]AW[pg]AW[qg]AW[rg]AW[ob]AW[nc]AW[mc]AW[mb]AB[nb]AB[oc]AB[pc]AB[pd]AB[pe]AB[pb]AB[pa]AB[qb]AB[rb]AP[goproblems]
(;B[sd]
(;W[se]C[CHOICE]
(;B[re];W[qe]
(;B[sf]
(;W[sc]
(;B[qf];W[rf]
(;B[oa]
(;W[ra];B[pf]
(;W[sg];B[qa]C[KoRIGHT])
(;W[ma]
(;B[qa]C[KoRIGHT])
(;B[na])))
(;W[pf];B[ra]C[RIGHT])
(;W[ma]C[CHOICE]
(;B[ra];W[na];B[pf]C[KoRIGHT])
(;B[na];W[ra];B[pf];W[sg])
(;B[pf]
(;W[na];B[ra]C[KoRIGHT])
(;W[ra]
(;B[qa]C[KoRIGHT])
(;B[na];W[sg])))))
(;B[pf];W[na];B[ra];W[oa]C[Black can not approach white]))
(;B[oa];W[ra];B[qf];W[rf];B[pf]))
(;W[qf];B[oa];W[ra];B[sc]C[KoRIGHT]))
(;B[qf];W[rf]
(;B[sf]
(;W[sc]
(;B[oa]
(;W[ra];B[pf]
(;W[sg];B[qa]C[KoRIGHT])
(;W[ma]))
(;W[pf];B[ra]C[RIGHT])
(;W[ma]C[CHOICE]
(;B[ra];W[na];B[pf]C[KoRIGHT])
(;B[na];W[ra])
(;B[pf]
(;W[na];B[ra]C[KoRIGHT])
(;W[ra]
(;B[qa]C[KoRIGHT])
(;B[na])))))
(;B[pf];W[na];B[ra];W[oa]C[Black can not approach white]))
(;W[pf];B[oa];W[ra];B[sc]C[Ko];W[ma];B[na]C[RIGHT]))
(;B[ra];W[na];B[sf];W[pf]C[No second eye])
(;B[oa]
(;W[ra];B[sf];W[sc];B[pf]
(;W[sg];B[qa]C[KoRIGHT])
(;W[ma]))
(;W[ma]
(;B[na];W[ra];B[sf];W[sc];B[pf];W[sg])
(;B[ra];W[na];B[sf];W[pf]C[Black is dead])
(;B[sf];W[pf];B[na];W[ra];B[sc]C[KoRIGHT]))))
(;B[oa];W[ra];B[sf]
(;W[sc];B[qf];W[rf];B[pf])
(;W[qf];B[sc]C[KoRIGHT])))
(;B[oa]
(;W[ma]
(;B[ra]C[Mistake];W[na];B[re];W[qe];B[sf];W[qf];B[sc]C[Black is dead])
(;B[na]C[Mistake];W[ra];B[re];W[qe];B[sf];W[sc];B[qf];W[rf];B[pf]C[Black can not approach white so he is dead.];W[sg])
(;B[re];W[qe];B[sf];W[qf];B[na];W[ra];B[sc]C[RIGHT]))
(;W[ra];B[re];W[qe];B[sf]
(;W[sc];B[qf];W[rf];B[pf]
(;W[sg];B[qa]C[KoRIGHT])
(;W[ma]))
(;W[qf];B[sc]C[KoRIGHT])))
(;B[qe]C[Does not work];W[re];B[rf];W[qf];B[oa];W[ra];B[qa];W[sc];B[sa];W[rd])
(;B[rd];W[re]C[Nothing here for black])
(;B[ra];W[na];B[re];W[qe]
(;B[sf];W[qf]C[No second eye])
(;B[qf];W[rf];B[sf];W[pf]C[No second eye])))
(;W[rd]C[Mistake];B[re];W[sc];B[se]C[Very bad for whiteRIGHT])
(;W[na]C[Mistake];B[qe];W[re];B[rd]C[RIGHT])
(;W[qe];B[oa];W[ra];B[sc]C[KoRIGHT])
(;W[sc];B[ra];W[na];B[qe];W[re];B[sa];W[rd];B[rf];W[se];B[sf]C[White can not kill black unconditionallyRIGHT]))
(;B[ra];W[na]C[Nothing here for black])
(;B[oa];W[ra];B[sd];W[sc]
(;B[qe];W[re];B[rf];W[qf])
(;B[re];W[qe];B[qf];W[rf];B[pf];W[sf];B[qa];W[se];B[sa];W[rd]))
(;B[qe];W[re];B[oa];W[ra];B[sd];W[sc];B[rf];W[qf])
(;B[re];W[qe];B[sd];W[sc];B[qf];W[rf]
(;B[pf];W[ra];B[oa];W[sf];B[qa];W[se];B[sa];W[rd])
(;B[ra];W[na];B[pf];W[oa]C[Black can not approach white])
(;B[oa];W[ra];B[pf];W[sf];B[qa];W[se];B[sa];W[rd])))