(;AB[br]AB[bq]AB[cr]AW[bs]AW[ds]AW[dr]AW[dq]AW[cq]AW[cp]AW[bp]AW[ap]AB[bn]AB[cn]AB[do]AB[ep]AB[eq]AB[fr]C[Black to kill White]AP[goproblems]
(;B[ar]C[White cannot form two eyes and is deadRIGHT];W[cs]C[White cannot form two eyes and is deadRIGHT]
(;B[dp]C[RIGHT];W[aq]C[RIGHT];B[co]C[RIGHT];W[as]C[RIGHT];B[br]C[RIGHT])
(;B[ao]C[RIGHT])
(;B[bo]C[RIGHT])
(;B[co]C[RIGHT])
(;B[er]C[RIGHT])
(;B[es]C[RIGHT])
(;B[aq]C[RIGHT]))
(;B[aq]
(;W[ar]C[CHOICE];B[as];W[cs])
(;W[cs]C[];B[ar];W[as];B[br]))
(;B[cs]
(;W[aq]C[CHOICE]
(;B[ar];W[as])
(;B[as];W[ar]))
(;W[ar];B[as];W[aq]))
(;B[as];W[ar])
(;B[dp];W[ar])
(;B[er];W[ar])
(;B[es];W[ar])
(;B[ao];W[ar])
(;B[bo];W[ar])
(;B[co];W[ar])
(;B[fs];W[ar])
(;B[an];W[ar]))