Klaus: I know two local "joseki" sequences when White tries to stabilise his stone by using a cross cut. But what about the third diagram? What is White going to do about that?
DJ: Where is here??!?
Klaus: Mistake removed
Now White has to answer Black a at b, so Black keeps sente.
Klaus: Maybe this is the reason, why I cannot give 6 or more stones handicap! I just do't know how to punish that stuff.
unkx80: I am not too sure. How is this?
DJ: Is this a handicap game? Black can now squeeze White in the corner by playing a, but then wouldn't the stones be just useless?
Dieter: One has to think about using the marked stones effectively. Unfortunately for Black, White can escape in this position. So ...
... up to can be effective. Black keeps the corner and his influence towards center and top.
Another option for Black is to hane from the other side and have White cross-cut in the corner. The corner is not small and Black has not entirely secure territory.