3-3 Point Invasion which peeps at the tiger's mouth
is usually played to keep sente. Sooner or later White plays , which is usually gote but which has a large follow-up.
 Black can connect at a or resist at b.
In a small sample (3) the pro always connects.
Black can also cut White off with here instead of in the diagram above, but then White can live.
Taking the corner by attempting the cut with is usually too painful for Black.
The question is whether Black can resist.
This way, White wins by one liberty.
would be a mistake. White loses a liberty.
unkx80: Doesn't at a win the capturing race?
fractic: I think so too. Also while White does indeed have one liberty less, she does have sente. In the earlier diagram she had one more liberty but Black had sente.
MrTenuki (KGS 3k): Please correct me if I'm wrong-- it seems to me that Black could try to trick White into playing the following sequence if he is komaster.
Then again, I did find a refutation for White for avoiding the ko...