The correct play for black.  

The correct play for black is this one, an example of the Go Proverb "The Comb Formation is Alive." If possible, he can revisit these cuts later for an attack, now that his life is ensured.

unkx80: Actually, it might be better to just play elsewhere. Black is already alive even without .

Ah! You are right. A white attack at will only succeed if one of the black groups two dame is filled.