(;AB[cb]AB[db]AB[ea]AB[fb]AB[fc]AB[fd]AB[ed]AB[dd]AB[cd]AB[cc]AB[bd]AW[ad]AW[bc]AW[ec]AW[bb]AW[ca]AW[da]AW[be]AW[ce]AW[de]AW[ee]AW[fe]AW[gd]AW[gc]AW[gb]AW[hf]C[Black to make life.]AW[ib]AW[bg]AP[goproblems]
(;B[ab];W[ba]
(;B[ac];W[aa]
(;B[ac]C[Well done!RIGHT])
(;B[ab];W[ac])
(;B[ga];W[ac])
(;B[fa];W[ac])
(;B[eb];W[ac])
(;B[dc];W[ac])
(;B[ae];W[af];B[ac]C[Well done!RIGHT]))
(;B[aa];W[ac])
(;B[ga];W[ac])
(;B[fa];W[ac])
(;B[eb];W[ac])
(;B[dc];W[ac])
(;B[ae];W[af]
(;B[ac];W[aa];B[ac]C[Well done!RIGHT])
(;B[aa];W[ac])))
(;B[ae];W[ab];B[ac]C[This is only a ko. White could kill unconditionally.])
(;B[ba];W[ca]
(;B[da];W[ab]
(;B[ca];W[ae]
(;B[aa];W[ac])
(;B[ga];W[ha]))
(;B[aa];W[ca])
(;B[ga];W[ha]))
(;B[ab];W[aa]
(;B[ae];W[ac])
(;B[da];W[ac])
(;B[ga];W[ac]))
(;B[aa];W[ab])
(;B[ac];W[ab];B[da];W[ae])
(;B[ae];W[af])
(;B[ga];W[ha]))
(;B[aa];W[ba]
(;B[ab];W[ac])
(;B[ac];W[ab])
(;B[ae];W[af]
(;B[ab];W[ac])
(;B[ac];W[ab])))
(;B[ac];W[ab]
(;B[ba];W[ca];B[da];W[ae])
(;B[aa];W[ba]))
(;B[ga];W[ba]))