(;AW[ar]AW[br]AW[bq]AB[ao]AW[co]AB[bm]AB[cn]AB[cm]AB[do]AB[dq]AW[cq]AB[dr]AB[en]AB[fq]AW[cr]C[Can White live here unconditionally? If so, play the move that secures life. Play at K if you think all White has is a ko. Play at T if you think White is dead.]LB[em:K]LB[fm:T]AB[ep]AB[fr]AP[goproblems]
(;W[em]C[White can live unconditionally.])
(;W[fm]C[White has something here.])
(;W[an];B[bo]C[Dead.])
(;W[bn];B[bo]C[Dead.])
(;W[bo];B[ap]C[Dead.])
(;W[ap];B[bp]
(;W[an];B[bo]C[Dead.])
(;W[bn];B[bo]C[Dead.])
(;W[bo]C[];B[aq]MA[ap]
(;W[an];B[cp]C[Dead.])
(;W[bn];B[cp]C[Dead.])
(;W[cp]C[White is alive.RIGHT])
(;W[dp];B[cp]C[Dead.])
(;W[as];B[an]C[Dead.])
(;W[bs];B[an]C[Dead.])
(;W[cs];B[an]C[Dead.])
(;W[ds];B[an]C[Dead.]))
(;W[cp];B[bo]C[Dead.])
(;W[dp];B[bo]C[Dead.])
(;W[as];B[bo]C[Dead.])
(;W[bs];B[bo]C[Dead.])
(;W[cs];B[bo]C[Dead.])
(;W[ds];B[bo]C[Dead.]))
(;W[bp];B[ap]C[Dead.])
(;W[cp];B[ap]C[Dead.])
(;W[aq]C[Dead in gote.])
(;W[dp];B[ap]C[Dead.])
(;W[as]C[Dead in gote.])
(;W[bs];B[ap]C[Dead.])
(;W[cs];B[ap]C[Dead.])
(;W[ds];B[ap]C[Dead.]))