(;AW[br]AW[bq]AW[cr]AB[dp]AB[eq]AB[er]AB[co]AB[bo]C[White to play and live unconditionally with points, or play at T if you think that White cannot live unconditionally.]AW[as]AW[dr]AB[bs]AB[bm]AB[gr]LB[eo:T]AP[goproblems]
(;W[aq];B[ar]C[Play T if you need a ko threat to live.]LB[eo:T]
(;W[cs]MA[ar]MA[bs]C[2 eyes and alive.RIGHT])
(;W[ds];B[as]C[Just one eye.])
(;W[cp];B[as]MA[bp]MA[dq]C[Just one eye. The marked spots are miai for a kill.])
(;W[dq];B[as]C[Just one eye. The marked spots are miai for a kill.]MA[cp]MA[bp])
(;W[bp];B[as]C[Just one eye. The marked spots are miai for a kill.]MA[cp]MA[dq])
(;W[eo];B[as]C[Black ignores the threat and kills your group. And you really did not need a threat after all...])
(;W[cq];B[as]C[Inspiring, but no.])
(;W[ap];B[as]C[One eye.])
(;W[ao];B[as]C[One eye])
(;W[es];B[as]C[Nope.]))
(;W[cs];B[aq]
(;W[ap];B[bp])
(;W[bp];B[ap])
(;W[cp];B[bp])
(;W[dq];B[bp]))
(;W[ar]C[Ouch - you got a stone in your eye!])
(;W[ap];B[ar]
(;W[ds];B[bp]C[Even though this last move is not really necessary (If White plays it White is still dead by bent 4 in the corner) Black plays it anyway just to show White can be killed whenever that is needed.])
(;W[cs];B[as]C[One eye.])
(;W[aq];B[as]C[One eye.])
(;W[bp];B[ds]
(;W[cs];B[as]C[Just one eye. The marked spots are miai for a kill.])
(;W[aq];B[cs])
(;W[dq];B[cp])
(;W[cp];B[dq]))
(;W[dq];B[bp])
(;W[cp];B[bp])
(;W[es]C[White dies in gote...]))
(;W[ds];B[aq]
(;W[ap];B[bp])
(;W[bp];B[ap])
(;W[cp];B[bp])
(;W[dq];B[bp])
(;W[es]C[Dead in gote.]))
(;W[bp];B[ar]
(;W[ap];B[ds]
(;W[cs];B[as]C[Just one eye. The marked spots are miai for a kill.])
(;W[aq];B[cs])
(;W[dq];B[cp])
(;W[cp];B[dq]))
(;W[ds];B[ap]
(;W[aq];B[as]C[One eye.])
(;W[cp];B[dq])
(;W[dq];B[cp])
(;W[cs];B[aq]))
(;W[aq];B[as]C[Just one eye. The marked spots are miai for a kill.]MA[cp]MA[dq])
(;W[cs];B[as]C[One eye.])
(;W[cp];B[dq])
(;W[dq];B[cp])
(;W[es]C[Dead in gote.])
(;W[ao]C[Dead in gote.]))
(;W[dq];B[ar]
(;W[aq];B[as]C[Just one eye. The marked spots are miai for a kill.]MA[cp]MA[bp])
(;W[cs];B[as]C[Just one eye.])
(;W[bp];B[cp])
(;W[cp];B[bp];W[aq];B[as])
(;W[ds];B[bp]))
(;W[cp];B[ar]
(;W[aq];B[as]MA[bp]MA[dq]C[Just one eye. The marked spots are miai for a kill.])
(;W[dq];B[bp];W[aq];B[as])
(;W[bp];B[dq])
(;W[cs];B[as]C[Just one eye. The marked spots are miai for a kill.]MA[dq]MA[bp])
(;W[ds];B[bp])
(;W[ap];B[bp]))
(;W[eo]AB[br]AB[bq]AB[cr]AW[dp]AW[eq]AW[er]AW[co]AW[bo]AB[as]AB[dr]AW[bs]AW[bm]AW[gr]C[];B[aq]C[You think the corner was dead. So I swapped colors. Black now tries to live. Can you kill Black, get a ko, a seki, anything?]LB[dn:No]
(;W[ar];B[cs]C[Black lives!])
(;W[ds]C[Black lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at E1.])
(;W[cs]C[Black lives. If you capture at A2 then Black plays D1 to prevent you from filling A1. If you play D1 Black captures at E1.])
(;W[ap]C[Black tenukies and lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at D1.])
(;W[bp]C[Black tenukies and lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at D1.])
(;W[cq]C[Black tenukies and lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at D1.])
(;W[dq]C[Black tenukies and lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at D1.])
(;W[es]C[Black tenukies and lives. If you capture at A2 then Black plays C1 to prevent you from filling A1. If you play C1 Black captures at D1.])
(;W[dn]C[Black does live unconditionally after all. A3 did the trick.]TR[aq]))
(;W[es];B[ar]
(;W[aq];B[as]C[Nope.])
(;W[ds])
(;W[cs];B[as]C[One eye.])
(;W[fs];B[gs])
(;W[gs];B[hs])
(;W[fr];B[fq])
(;W[gq];B[fs])
(;W[bp]C[Dead in gote.])
(;W[ap]C[Dead in gote.])))