(;
AB[hc][bd][cd][de][ee][fe][ge][cf]
AW[bc][cc][dd][ed][fd]
C[Black plays.]
(;
B[eb]
C[OK, an obvious first move is here.];
W[fb]
C[But after this block, does Black have an obvious follow-up sequence?];
B[gb];W[fa];B[fc];W[ec]
C[All of this seems to be leading Black nowhere.]
(;
B[gd]
C[Will you settle for this ko?

Black can do better!]
)
    (;
    B[db]
    C[A hard to spot move from the initial position.  White cannot avoid a big loss.];
    W[gc];B[dc];W[hb]
    C[For example, ...];
    B[gd];W[fc];B[bb]
    C[... Black captures the corner in sente, because White owes another move to save the top group.]
    )
)
    (;
    B[fb]
    C[Fails.];
    W[eb]
    C[White takes the vital point.];
    B[db];W[ea]
    LB[dc:A]
    C[White doesn't have the cutting point weakness at A.]
    )
)

