(;AW[bc]AW[cd]AW[ce]AW[cf]AW[bg]AW[dg]AW[dh]AB[cb]AB[eb]AB[cc]AB[bd]AB[dd]AB[ed]AB[be]AB[bf]MA[bc]C[What can white accomplish with this stone?]PL[W]
(;W[ad];B[bb]
(;W[ab]C[Ko. If white wins it, the three black stones are dead.RIGHT])
(;W[af];B[ac]C[This doesn't work.])
(;W[ac];B[ab]C[No, this achieves nothing.]))
(;W[af];B[bb]C[Nope.])
(;W[bb];B[ba]
(;W[ad];B[ab]C[No.])
(;W[ab];B[ca]
(;W[ad];B[aa]C[No good.])
(;W[af];B[aa]C[Nope.]))
(;W[ac];B[ad]C[Failure.]))
(;W[ac];B[bb]C[No, descending doesn't work.])
(;W[ab];B[ad]
(;W[bb];B[ba]C[No good.])
(;W[ac];B[bb]C[Dead.])
(;W[af];B[bb]C[That does not work.]))
(;W[ae];B[ac]
(;W[af];B[bb]C[Failure.])
(;W[bb];B[ab]C[No good.])
(;W[ab];B[bb]C[Failure.])))