(;AW[ab]AW[bb]AW[cc]AW[dc]AW[ec]AW[fb]AB[bc]AB[ac]AB[cd]AB[be]AB[ed]AB[fd]AB[gc]AB[gb]AB[ga]C[Black to kill]AP[goproblems]
(;B[ba];W[ca];B[da];W[db];B[cb]C[Ko, good job!RIGHT])
(;B[ca];W[cb]
(;B[da];W[ea];B[ba];W[eb]C[Seki])
(;B[ea];W[fa];B[eb];W[fc]C[White is alive]))
(;B[da];W[ea];B[ba];W[cb];B[ca];W[eb]C[Seki])
(;B[fa];W[ea];B[ca];W[cb];B[da];W[eb]C[Seki])
(;B[cb];W[db]
(;B[da];W[ca]C[White is alive])
(;B[ca];W[da]C[White is alive])))