(;AB[ca]AB[da]AB[db]AB[dc]AB[dd]AB[ce]AB[cf]AB[bf]AW[ae]AW[be]AW[cd]AW[cc]AW[cb]AW[ba]C[Black to kill. (without ko)]AP[goproblems]
(;B[ac]
(;W[bc]
(;B[ab]C[];W[ad];B[af]C[RIGHT])
(;B[ad];W[ab])
(;B[bd];W[ad]))
(;W[ab]
(;B[bd]C[RIGHT])
(;B[bc];W[bd])
(;B[af];W[bc])))
(;B[bc];W[bd]
(;B[ab];W[ac]C[Ko.])
(;B[bb];W[ab]C[Ko])
(;B[ac];W[ab]))
(;B[ab];W[ac]
(;B[bc];W[bd]C[Ko.])
(;B[bb];W[bc]C[Snapback.])
(;B[bd];W[bc]))
(;B[bb];W[ab]
(;B[aa]C[Ko.])
(;B[bc];W[bd]C[Ko.])
(;B[ac];W[bc])
(;B[bd];W[bc]))
(;B[bd];W[bc])
(;B[ad];W[ac]
(;B[bc];W[ab])
(;B[ab];W[bc])
(;B[bb];W[ab]C[Ko.])))