(;AB[cb]AB[dc]AB[dd]AB[ed]AB[fd]AB[fc]AB[be]AW[db]AW[eb]AW[ec]AW[fb]AW[hc]AW[he]AW[bh]AW[cf]AW[ef]AW[gf]AW[gc]AW[bb]AB[ca]AW[bc]AB[cc]AW[ce]AB[bd]AW[bf]AB[ba]C[White to kill]AP[goproblems]
(;W[ab];B[ae]
(;W[ad];B[aa])
(;W[aa];B[ac])
(;W[ac]C[RIGHT])
(;W[cd];B[ac]C[Ko])
(;W[af];B[ac]C[Ko]))
(;W[ac];B[ab]
(;W[aa];B[ad])
(;W[cd];B[ad])
(;W[ae];B[ad])
(;W[ad];B[ae]))
(;W[cd];B[ab]
(;W[ae];B[ac];W[bc];B[ad])
(;W[ad];B[ac])
(;W[ac];B[ad]))
(;W[ae];B[ab]
(;W[ad];B[ac];W[bc];B[cd])
(;W[ac];B[ad])
(;W[cd];B[ac];W[bc];B[ad]))
(;W[ad];B[ab]
(;W[ae];B[ac];W[bc]
(;B[cd])
(;B[af]))
(;W[ac];B[ae])
(;W[cd];B[ac]))
(;W[aa];B[ab]))