(;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.])))