(;AB[bs]AB[br]AB[bq]AB[bn]AB[bo]AB[bp]AB[ra]AB[rb]AB[rc]AB[rd]AW[qa]AW[qb]AW[qc]AW[qd]AW[qe]AW[re]AW[rg]AW[cm]AW[cn]AW[co]AW[cp]AW[cq]AW[cr]AW[lr]AW[nr]AW[nq]AW[oq]AW[pq]AW[qq]AW[rq]AW[sq]AB[or]AB[pr]AB[qr]AB[rr]AB[sr]AW[bm]AW[bk]C[Kill whatever needs killing.]AP[goproblems]
(;W[sd];B[os]C[Black saves the group you could kill. The upper right corner was already dead.])
(;W[os]
(;B[ps];W[rs]C[RIGHT])
(;B[cs];W[er];B[ds];W[fq];B[es];W[fs];B[dr];W[dq]C[Just for reference; Black can intrude on White but not that far.RIGHT]))
(;W[rs];B[os];W[qs]C[RIGHT])
(;W[an];B[ao]
(;W[aq];B[ar]
(;W[os];B[ps];W[rs]C[RIGHT])
(;W[rs];B[os];W[qs]C[RIGHT])
(;W[am];B[os]C[Black saves the group you could kill.]))
(;W[os]C[];B[ps];W[rs]C[RIGHT])
(;W[rs]C[];B[os];W[qs]C[RIGHT])
(;W[ar];B[aq]
(;W[os];B[ps];W[rs]C[RIGHT])
(;W[rs];B[os];W[qs]C[RIGHT])
(;W[am];B[os]C[Black saves the group you could kill.]))
(;W[am];B[os]C[Black saves the group you could kill.]))
(;W[am];B[os]C[Black saves the group you could kill. The lower left is still alive.])
(;W[cs];B[os]C[C1 is worth 7 points in gote (reverse sente) if the lower side is indeed White's territory, which is not certain yet. The corner Black just saved is bigger.])
(;W[ar];B[an]
(;W[aq];B[os]MA[ap]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.])
(;W[ap];B[os]MA[aq]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.])
(;W[os]C[RIGHT])
(;W[rs]C[RIGHT]))
(;W[aq];B[an]
(;W[os]C[RIGHT])
(;W[rs]C[RIGHT])
(;W[ap];B[os]MA[ar]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.])
(;W[ar];B[os]MA[ap]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.]))
(;W[ap];B[an]
(;W[os]C[RIGHT])
(;W[rs]C[RIGHT])
(;W[aq];B[os]MA[ar]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.])
(;W[ar];B[os]MA[aq]C[Black saves the lower right corner. All you can get on the lower left is a gote seki.]))
(;W[ao];B[an]
(;W[os]C[RIGHT])
(;W[rs]C[RIGHT]))
(;W[ps];B[os])
(;W[qs];B[rs])
(;W[ss];B[os]))